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  • Server freezes at XX:25

    - by Karevan
    We've ordered a 50 euro/month server on hetzner.de, it has debian OS. The problem is that server is freezing in random time of the day and nothing appears in log. Only hardware reboot helps. Part of the log file while it was freezing: Aug 17 22:38:26 Debian-60-squeeze-64-minimal pure-ftpd: ([email protected]) [INFO] New connection from 95.211.120.220 Aug 17 22:38:26 Debian-60-squeeze-64-minimal pure-ftpd: ([email protected]) [INFO] Logout. Aug 17 22:39:01 Debian-60-squeeze-64-minimal /USR/SBIN/CRON[22828]: (root) CMD ( [ -x /usr/lib/php5/maxlifetime ] && [ -d /var/lib/php5 ] && find /var/lib/php5/ -type$ Aug 17 23:09:01 Debian-60-squeeze-64-minimal /USR/SBIN/CRON[22835]: (root) CMD ( [ -x /usr/lib/php5/maxlifetime ] && [ -d /var/lib/php5 ] && find /var/lib/php5/ -type$ Aug 17 23:17:01 Debian-60-squeeze-64-minimal /USR/SBIN/CRON[22842]: (root) CMD ( cd / && run-parts --report /etc/cron.hourly) Aug 17 23:39:01 Debian-60-squeeze-64-minimal /USR/SBIN/CRON[22847]: (root) CMD ( [ -x /usr/lib/php5/maxlifetime ] && [ -d /var/lib/php5 ] && find /var/lib/php5/ -type$ Aug 18 09:47:47 Debian-60-squeeze-64-minimal kernel: imklog 4.6.4, log source = /proc/kmsg started. Aug 18 09:47:47 Debian-60-squeeze-64-minimal rsyslogd: [origin software="rsyslogd" swVersion="4.6.4" x-pid="1229" x-info="http://www.rsyslog.com"] (re)start Aug 18 09:47:47 Debian-60-squeeze-64-minimal kernel: [ 0.000000] Initializing cgroup subsys cpuset Aug 18 09:47:47 Debian-60-squeeze-64-minimal kernel: [ 0.000000] Initializing cgroup subsys cpu Aug 18 09:47:47 Debian-60-squeeze-64-minimal kernel: [ 0.000000] Linux version 2.6.32-5-amd64 (Debian 2.6.32-45) ([email protected]) (gcc version 4.3.5 (Debian 4.3.5$ Aug 18 09:47:47 Debian-60-squeeze-64-minimal kernel: [ 0.000000] Command line: BOOT_IMAGE=/vmlinuz-2.6.32-5-amd64 root=/dev/md2 ro As you can see, it appears only the fact of starting. No. theres no way to look in server's console right after when it freezes, sadly. Datacenter supporters do not really want to help about that. Server has been installed 30th july, times and dates of freezes are down there: 6 august, 0:25 18 august, 2:27 21 august, 1:25 26 august, 23:26. We decided that freezing around ??:25 isn't a hardware fault, and decided to reinstall the OS. Later, 31 august, our admin backed up all files, reinstalled Debian, and restored the backup. But then, 7 september, server went down again, at 5:05. We thought it was related to Anyone else experiencing high rates of Linux server crashes during a leap second day? and turned ntp off. But then the server went down twice again, 21 september, 17:29 and 24 september, 20:27. I called all linux admins I knew to help with solving it and they said everything is fine about configuring OS and it could be hardware only. But they dont know why it always freezes at XX:25-30. Maybe some of you know about something related to that?

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  • I Choose iNada

    - by Mark Treadwell
    As a laptop and Kindle user, I have been looking at the usual cyclical Apple frenzy in the press with the same kind of amused tolerance I give my three-year-old son.  They never seem to learn, and they keep repeating the same things.  However when I ready articles like this, I am reminded that that is not always the case. I am a happy user of a monster-sized HP HDX laptop, HP touch screen all-in-one system, and multi-screen Dell desktops at home as well as a HP business laptop at work.  I have no iPod, iMac, iTouch or any other relationship with the company who wants to trademark the prefix “i”. I have not missed them. That is not to say that I have no technological gadgets.  I do.  They just do not dominate Every company wants to preserve their customer base, but Apple just does it too rigidly.  The buy-in necessary rubs me wrong.  When the fanboys scream about the next great iApple thing which will kill off another market segment (this time, the iPad will kill off laptops), the amused tolerance returns. From what I have seen, the iPad virtual keyboard is a poor substitute for an actual keyboard.  It was intended to let you get some kind of text into a device that is not really intended for keyboard input, but rather for touch manipulation of a designed interface.  I like the virtual keyboard on my LG Dare cell phone, but you will not catch me writing my next novel with it.  But, you hear, you can connect a real keyboard and get info from another computer.  That is when you realize that the iPad is not a true standalone device like a laptop.  You have to make more hardware purchases to get what you truly want.  It is an expensive accommodation to get you a different form of freedom. So if Apple made a product with me in mind, you can have it.  Everyone gets to make their own choice.  My choice is the iNada.

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  • vSphere ESX 5.5 hosts cannot connect to NFS Server

    - by Gerald
    Summary: My problem is I cannot use the QNAP NFS Server as an NFS datastore from my ESX hosts despite the hosts being able to ping it. I'm utilising a vDS with LACP uplinks for all my network traffic (including NFS) and a subnet for each vmkernel adapter. Setup: I'm evaluating vSphere and I've got two vSphere ESX 5.5 hosts (node1 and node2) and each one has 4x NICs. I've teamed them all up using LACP/802.3ad with my switch and then created a distributed switch between the two hosts with each host's LAG as the uplink. All my networking is going through the distributed switch, ideally, I want to take advantage of DRS and the redundancy. I have a domain controller VM ("Central") and vCenter VM ("vCenter") running on node1 (using node1's local datastore) with both hosts attached to the vCenter instance. Both hosts are in a vCenter datacenter and a cluster with HA and DRS currently disabled. I have a QNAP TS-669 Pro (Version 4.0.3) (TS-x69 series is on VMware Storage HCL) which I want to use as the NFS server for my NFS datastore, it has 2x NICs teamed together using 802.3ad with my switch. vmkernel.log: The error from the host's vmkernel.log is not very useful: NFS: 157: Command: (mount) Server: (10.1.2.100) IP: (10.1.2.100) Path: (/VM) Label (datastoreNAS) Options: (None) cpu9:67402)StorageApdHandler: 698: APD Handle 509bc29f-13556457 Created with lock[StorageApd0x411121] cpu10:67402)StorageApdHandler: 745: Freeing APD Handle [509bc29f-13556457] cpu10:67402)StorageApdHandler: 808: APD Handle freed! cpu10:67402)NFS: 168: NFS mount 10.1.2.100:/VM failed: Unable to connect to NFS server. Network Setup: Here is my distributed switch setup (JPG). Here are my networks. 10.1.1.0/24 VM Management (VLAN 11) 10.1.2.0/24 Storage Network (NFS, VLAN 12) 10.1.3.0/24 VM vMotion (VLAN 13) 10.1.4.0/24 VM Fault Tolerance (VLAN 14) 10.2.0.0/24 VM's Network (VLAN 20) vSphere addresses 10.1.1.1 node1 Management 10.1.1.2 node2 Management 10.1.2.1 node1 vmkernel (For NFS) 10.1.2.2 node2 vmkernel (For NFS) etc. Other addresses 10.1.2.100 QNAP TS-669 (NFS Server) 10.2.0.1 Domain Controller (VM on node1) 10.2.0.2 vCenter (VM on node1) I'm using a Cisco SRW2024P Layer-2 switch (Jumboframes enabled) with the following setup: LACP LAG1 for node1 (Ports 1 through 4) setup as VLAN trunk for VLANs 11-14,20 LACP LAG2 for my router (Ports 5 through 8) setup as VLAN trunk for VLANs 11-14,20 LACP LAG3 for node2 (Ports 9 through 12) setup as VLAN trunk for VLANs 11-14,20 LACP LAG4 for the QNAP (Ports 23 and 24) setup to accept untagged traffic into VLAN 12 Each subnet is routable to another, although, connections to the NFS server from vmk1 shouldn't need it. All other traffic (vSphere Web Client, RDP etc.) goes through this setup fine. I tested the QNAP NFS server beforehand using ESX host VMs atop of a VMware Workstation setup with a dedicated physical NIC and it had no problems. The ACL on the NFS Server share is permissive and allows all subnet ranges full access to the share. I can ping the QNAP from node1 vmk1, the adapter that should be used to NFS: ~ # vmkping -I vmk1 10.1.2.100 PING 10.1.2.100 (10.1.2.100): 56 data bytes 64 bytes from 10.1.2.100: icmp_seq=0 ttl=64 time=0.371 ms 64 bytes from 10.1.2.100: icmp_seq=1 ttl=64 time=0.161 ms 64 bytes from 10.1.2.100: icmp_seq=2 ttl=64 time=0.241 ms Netcat does not throw an error: ~ # nc -z 10.1.2.100 2049 Connection to 10.1.2.100 2049 port [tcp/nfs] succeeded! The routing table of node1: ~ # esxcfg-route -l VMkernel Routes: Network Netmask Gateway Interface 10.1.1.0 255.255.255.0 Local Subnet vmk0 10.1.2.0 255.255.255.0 Local Subnet vmk1 10.1.3.0 255.255.255.0 Local Subnet vmk2 10.1.4.0 255.255.255.0 Local Subnet vmk3 default 0.0.0.0 10.1.1.254 vmk0 VM Kernel NIC info ~ # esxcfg-vmknic -l Interface Port Group/DVPort IP Family IP Address Netmask Broadcast MAC Address MTU TSO MSS Enabled Type vmk0 133 IPv4 10.1.1.1 255.255.255.0 10.1.1.255 00:50:56:66:8e:5f 1500 65535 true STATIC vmk0 133 IPv6 fe80::250:56ff:fe66:8e5f 64 00:50:56:66:8e:5f 1500 65535 true STATIC, PREFERRED vmk1 164 IPv4 10.1.2.1 255.255.255.0 10.1.2.255 00:50:56:68:f5:1f 1500 65535 true STATIC vmk1 164 IPv6 fe80::250:56ff:fe68:f51f 64 00:50:56:68:f5:1f 1500 65535 true STATIC, PREFERRED vmk2 196 IPv4 10.1.3.1 255.255.255.0 10.1.3.255 00:50:56:66:18:95 1500 65535 true STATIC vmk2 196 IPv6 fe80::250:56ff:fe66:1895 64 00:50:56:66:18:95 1500 65535 true STATIC, PREFERRED vmk3 228 IPv4 10.1.4.1 255.255.255.0 10.1.4.255 00:50:56:72:e6:ca 1500 65535 true STATIC vmk3 228 IPv6 fe80::250:56ff:fe72:e6ca 64 00:50:56:72:e6:ca 1500 65535 true STATIC, PREFERRED Things I've tried/checked: I'm not using DNS names to connect to the NFS server. Checked MTU. Set to 9000 for vmk1, dvSwitch and Cisco switch and QNAP. Moved QNAP onto VLAN 11 (VM Management, vmk0) and gave it an appropriate address, still had same issue. Changed back afterwards of course. Tried initiating the connection of NAS datastore from vSphere Client (Connected to vCenter or directly to host), vSphere Web Client and the host's ESX Shell. All resulted in the same problem. Tried a path name of "VM", "/VM" and "/share/VM" despite not even having a connection to server. I plugged in a linux system (10.1.2.123) into a switch port configured for VLAN 12 and tried mounting the NFS share 10.1.2.100:/VM, it worked successfully and I had read-write access to it I tried disabling the firewall on the ESX host esxcli network firewall set --enabled false I'm out of ideas on what to try next. The things I'm doing differently from my VMware Workstation setup is the use of LACP with a physical switch and a virtual distributed switch between the two hosts. I'm guessing the vDS is probably the source of my troubles but I don't know how to fix this problem without eliminating it.

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  • Unable to commit file through svn, server sent truncated HTTP response body

    - by Rocket3G
    I have my own VPS, on which I want to run a simple SVN + chiliproject setup. I have re-installed SVN, CHILI and the OS several times, and it always works for a couple of hours/days and then it just stops working. Well, everything works, except I can't upload any files. Committing directories seems to work just fine, but when I try to commit a file it breaks. I have an error log file, which gives me the following text when I try to commit something x.x.x.x - - [19/Oct/2013:00:01:46 +0200] "OPTIONS /project HTTP/1.1" 200 149 x.x.x.x - - [19/Oct/2013:00:01:46 +0200] "PROPFIND /project HTTP/1.1" 207 346 x.x.x.x - - [19/Oct/2013:00:01:46 +0200] "MKACTIVITY /project/!svn/act/c11d45ac-86b6-184a-ac5a-9a1105d64563 HTTP/1.1" 401 345 x.x.x.x - admin [19/Oct/2013:00:01:46 +0200] "MKACTIVITY /project/!svn/act/c11d45ac-86b6-184a-ac5a-9a1105d64563 HTTP/1.1" 201 262 x.x.x.x - - [19/Oct/2013:00:01:46 +0200] "PROPFIND /project HTTP/1.1" 207 236 x.x.x.x - admin [19/Oct/2013:00:01:46 +0200] "CHECKOUT /project/!svn/vcc/default HTTP/1.1" 201 271 x.x.x.x - admin [19/Oct/2013:00:01:46 +0200] "PROPPATCH /project/!svn/wbl/c11d45ac-86b6-184a-ac5a-9a1105d64563/1 HTTP/1.1" 207 267 x.x.x.x - admin [19/Oct/2013:00:01:46 +0200] "CHECKOUT /project/!svn/ver/1 HTTP/1.1" 201 271 x.x.x.x - - [19/Oct/2013:00:01:46 +0200] "HEAD /project/index.html HTTP/1.1" 404 - x.x.x.x - admin [19/Oct/2013:00:01:46 +0200] "PUT /project/!svn/wrk/c11d45ac-86b6-184a-ac5a-9a1105d64563/index.html HTTP/1.1" 201 269 x.x.x.x - admin [19/Oct/2013:00:02:04 +0200] "DELETE /project/!svn/act/c11d45ac-86b6-184a-ac5a-9a1105d64563 HTTP/1.1" 204 - So it seems that it PUTs the file (test.html) correctly, and somehow somewhere something is wrong (file permissions are alright, when I purposely stated that they are wrong, it gave me errors, which is expected, and they were about the file permissions being incorrect. The odd thing is that files won't get added, but directories are fine. I also have enough storage left on my machine. What I should note, perhaps, is that I use Ubuntu 12.04.3 with ruby 1.9.3, mysql 14.14 and I have it set up that Chiliproject handles the authentication and authorization for the project. It works, because I can commit directories and read it all correctly, though I can't upload files. Help would really be appreciated, as I don't know what on earth is going on with this 'truncated http response body'. I tried to read them with wireshark, but it basically gave me the same information. With regards, Ps. I have no clue what the delay between put and delete is, as it's a file of a mere 500 bytes, so it's uploaded in approximately a second. Pps. I copied this question from StackOverflow to this site, as I didn't know the existence of this site and another user suggested that I'd get more answers here, as it's basically a server fault.

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  • HP UX can not boot from Ignite Tape

    - by Spirit
    We have hp rp2470 server running hp-ux 11.00, with LVM mirroring. As for redundancy we have second rp2470 same hw (same two processors, same ram, same two hdd’s, same number of lan cards). I want to clone first one to the second. For that purpose I am making ignite tape with the following command: make_tape_recovery -x inc_entire=vg00 Ignite tape finishes without problems. When I boot second server from this ignate tape, server is starting to boot, and ignite restore finishes without any errors, only few notes, which are normal. However vmunix is not booting and when restore finishes, it boot to ISL prompt. From this I cannot boot /stand/vmunix. I tried to run recovery shell but no success. When recovery shell ask to do frecover to restore critical files, then I receive error: frecover(5405): unable to open /dev/rmt/0m At first I thought that the problem might be in the difference of the firmware version of the servers: fw version of production server is: Firmware Version 43.50 and fw version of backup server is: Firmware Version 42.19 So i did a fw upgrade of my backup server so that both servers are v43.50, and tried a recovery but again cant boot the system. Next I did another archive tape with -I (Interactive) flag: make_tape_recovery -I -x inc_entire=vg00 and tried recovery with it, again no good. I cannot find any error or warnings on ignite log, and I cannot boot hpux. I am only on ISL prompt. This is what i've noticed on the gsp logs: ************* SYSTEM ALERT ************** SYSTEM NAME: mcnfwim1 DATE: 07/27/2003 TIME: 10:18:49 ALERT LEVEL: 6 = Boot possible, pending failure - action required REASON FOR ALERT SOURCE: 8 = I/O SOURCE DETAIL: 6 = disk SOURCE ID: 0 PROBLEM DETAIL: 0 = no problem detail LEDs: RUN ATTENTION FAULT REMOTE POWER FLASH OFF ON ON ON LED State: Boot Failed. Running non-OS code. Check Chassis and Console Logs for error messages. 0x00000060860010B0 00000000 00000000 - type 0 = Data Field Unused 0x58000860860010B0 00006706 1B0A1231 - type 11 = Timestamp 07/27/2003 10:18:49 And another gsp log: Log Entry # 3 : SYSTEM NAME: mcnfwim1 DATE: 07/27/2003 TIME: 10:12:20 ALERT LEVEL: 6 = Boot possible, pending failure - action required SOURCE: 8 = I/O SOURCE DETAIL: 6 = disk SOURCE ID: 0 PROBLEM DETAIL: 0 = no problem detail CALLER ACTIVITY: 1 = test STATUS: 0 CALLER SUBACTIVITY: 0B = implementation dependent REPORTING ENTITY TYPE: 0 = system firmware REPORTING ENTITY ID: 00 0x00000060860010B0 00000000 00000000 type 0 = Data Field Unused 0x58000860860010B0 00006706 1B0A0C14 type 11 = Timestamp 07/27/2003 10:12:20 Type CR for next entry, - CR for previous entry, Q CR to quit. Please note that I can not change anything on the production server. I can only make changes to the backup server. Any help is appreciated.

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  • Linux per-process resource limits - a deep Red Hat Mystery

    - by BobBanana
    I have my own multithreaded C program which scales in speed smoothly with the number of CPU cores.. I can run it with 1, 2, 3, etc threads and get linear speedup.. up to about 5.5x speed on a 6-core CPU on a Ubuntu Linux box. I had an opportunity to run the program on a very high end Sunfire x4450 with 4 quad-core Xeon processors, running Red Hat Enterprise Linux. I was eagerly anticipating seeing how fast the 16 cores could run my program with 16 threads.. But it runs at the same speed as just TWO threads! Much hair-pulling and debugging later, I see that my program really is creating all the threads, they really are running simultaneously, but the threads themselves are slower than they should be. 2 threads runs about 1.7x faster than 1, but 3, 4, 8, 10, 16 threads all run at just net 1.9x! I can see all the threads are running (not stalled or sleeping), they're just slow. To check that the HARDWARE wasn't at fault, I ran SIXTEEN copies of my program independently, simultaneously. They all ran at full speed. There really are 16 cores and they really do run at full speed and there really is enough RAM (in fact this machine has 64GB, and I only use 1GB per process). So, my question is if there's some OPERATING SYSTEM explanation, perhaps some per-process resource limit which automatically scales back thread scheduling to keep one process from hogging the machine. Clues are: My program does not access the disk or network. It's CPU limited. Its speed scales linearly on a single CPU box in Ubuntu Linux with a hexacore i7 for 1-6 threads. 6 threads is effectively 6x speedup. My program never runs faster than 2x speedup on this 16 core Sunfire Xeon box, for any number of threads from 2-16. Running 16 copies of my program single threaded runs perfectly, all 16 running at once at full speed. top shows 1600% of CPUs allocated. /proc/cpuinfo shows all 16 cores running at full 2.9GHz speed (not low frequency idle speed of 1.6GHz) There's 48GB of RAM free, it is not swapping. What's happening? Is there some process CPU limit policy? How could I measure it if so? What else could explain this behavior? Thanks for your ideas to solve this, the Great Xeon Slowdown Mystery of 2010!

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  • Windows Service Limit Crashes Services on Startup

    - by Paul Williams
    We have developed a custom Windows service in C# as part of a large Enterprise application. Our QA department tests multiple versions of this service. The QA lab has several (over 20) copies of this service installed on one Windows 2003 test box. Each copy is in its own folder and has a unique service name, though each executable file is named the same (OurWindowsService.exe, for example). Each service uses the same Windows credentials (a domain user). The purpose of this service is to handle MSMQ messages. The queued messages do all sorts of important stuff. For some reason, they can run only 5 of these services at a time. When we start a 6th, the service crashes on startup. For example, I can start #1, #2, #3, #4, and #5. When I start #6, it crashes. However, if I stop #1 and start #6, #6 runs fine, and now #1 fails to start. When the services crash, the following error appears in the Windows event log: Faulting application OurWindowsService.exe, version 5.40.1.1, faulting module kernel32.dll, version 5.2.3790.4480, fault address 0x0000bef7. I was able to use WinDbg to generate a postmortem dump file. The dump file revealed that the crash occurs trying to delay load SHLWAPI.dll: 0:000> kb100 ChildEBP RetAddr Args to Child 0012ece4 79037966 c06d007e 00000000 00000001 KERNEL32!RaiseException+0x53 0012ed4c 790099ba 00000008 0012ed08 7c82860c mscoree!__delayLoadHelper2+0x139 0012ed98 790075b1 001550c8 0012edac 0012fb34 mscoree!_tailMerge_**SHLWAPI_dll**+0xd 0012edb0 79007623 001550c8 0012edf8 0012edf4 mscoree!XMLGetVersionWithSupported+0x22 0012ee00 790069a4 aa06f1b0 00000000 000001fe mscoree!RuntimeRequest::GetRuntimeVersion+0x56 0012f478 790077aa 00000001 7903fb4c 0012fb34 mscoree!RuntimeRequest::ComputeVersionString+0x5bd 0012f89c 79007802 00000001 0012f8b4 7903fb4c mscoree!RuntimeRequest::FindVersionedRuntime+0x11c 0012f8b8 79007b19 00000001 00000000 aa06fa6c mscoree!RuntimeRequest::RequestRuntimeDll+0x2c 0012ffa4 79007c02 00000001 0012ffbc 00000000 mscoree!GetInstallation+0x72 0012ffc0 77e6f23b 00000000 00000000 7ffdf000 mscoree!_CorExeMain+0x12 0012fff0 00000000 79007bf0 00000000 78746341 KERNEL32!BaseProcessStart+0x23 I believe the error code handed to Kernel32.RaiseException, c06d007e, means Module Not Found, but I'm not certain. Does this sound familiar to anyone? Are we hitting some limit on the number of service instances on some file name? Does MSMQ dislike more than 5 listening services?

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  • Both nginx and php5-fpm init.d startup scripts are non-functional and returning no errors..? But they used to work perfectly

    - by Ollie Treend
    I have been using nginx and php5-fpm on my Ubuntu box for a while now. Everything has been configured and setup correctly, and it ran like a charm. I have been keeping the packages updated & upgraded as usual, but haven't touched the nginx OR php5-fpm config files at all (thus I'm pretty sure this isn't my fault... ) Basically, I noticed nginx wasn't running as it should be. I ran the command sudo service nginx start, and the script did nothing. The same thing happens when trying to do anything - start, stop, restart or reload. This also happens for the "php5-fpm" init script - although all other init scripts seem to be functioning correctly. When trying to start nginx OR php5-fpm, this is what happens: root@HAL:/etc# service php5-fpm start root@HAL:/etc# I can't understand what is going wrong. The script isn't returning errors, but similarly it isn't starting the daemon or reporting success as usual. For reference, both installations are from the official nginx and php5-fpm PPAs. The fact that both started doing this at the same time has thrown me - since they are both unrelated packages. I have since purged both sets of packages from my system with apt-get purge ... and also apt-get remove --purge ... both of which have successfully removed the packages, their config files, and their init.d startup scripts. After having reinstalled nginx, I now have a functioning startup script again - I can start the web server as usual. However, php5-fpm is still experiencing the strange premature exiting of the startup script.. and I really can't figure out what's causing it. I have no idea what caused this to occur initially, but have managed to fix nginx. I now need to fix the php5-fpm startup script. If anybody could shed some light on this situation, I would be very grateful! The chances are both these issues are related - and they were caused by me doing something stupid. But now I need to fix it. This time I was lucky - because these problems are just on my development server. But I have 2 other live servers which are configured in a similar way, and I am worried the same thing will happen to these two as well! Has anybody else come across this? Do you have any words of advice? Thank you

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  • SystemTap 1.2 released

    <b>LWN.net:</b> "The systemtap team announces release 1.2. prototype perf event and hw-breakpoint probing, security fixes, error tolerance script language extensions, optimizations, tapsets, interesting new sample scripts, kernel versions 2.6.9 through 2.6.34-rc"

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  • My server's been hacked EMERGENCY

    - by Grant unwin
    I'm on my way into work at 9.30 p.m. on a Sunday because our server has been compromised somehow and was resulting in a DOS attack on our provider. The servers access to the Internet has been shut down which means over 5-600 of our clients sites are now down. Now this could be an FTP hack, or some weakness in code somewhere. I'm not sure till I get there. How can I track this down quickly? We're in for a whole lot of litigation if I don't get the server back up ASAP. Any help is appreciated. UPDATE Thanks to everyone for your help. Luckily I WASN'T the only person responsible for this server, just the nearest. We managed to resolve this problem, although it may not apply to many others in a different situation. I'll detail what we did. We unplugged the server from the net. It was performing (attempting to perform) a Denial Of Service attack on another server in Indonesia, and the guilty party was also based there. We firstly tried to identify where on the server this was coming from, considering we have over 500 sites on the server, we expected to be moonlighting for some time. However, with SSH access still, we ran a command to find all files edited or created in the time the attacks started. Luckily, the offending file was created over the winter holidays which meant that not many other files were created on the server at that time. We were then able to identify the offending file which was inside the uploaded images folder within a ZenCart website. After a short cigarette break we concluded that, due to the files location, it must have been uploaded via a file upload facility that was inadequetly secured. After some googling, we found that there was a security vulnerability that allowed files to be uploaded, within the ZenCart admin panel, for a picture for a record company. (The section that it never really even used), posting this form just uploaded any file, it did not check the extension of the file, and didn't even check to see if the user was logged in. This meant that any files could be uploaded, including a PHP file for the attack. We secured the vulnerability with ZenCart on the infected site, and removed the offending files. The job was done, and I was home for 2 a.m. The Moral - Always apply security patches for ZenCart, or any other CMS system for that matter. As when security updates are released, the whole world is made aware of the vulnerability. - Always do backups, and backup your backups. - Employ or arrange for someone that will be there in times like these. To prevent anyone from relying on a panicy post on Server Fault. Happy servering!

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  • Single domain name potentially resolving to multiple servers

    - by Jace
    first time here at Server Fault, and I apologize in advance that this domain stuff is not really my strength. Any and all suggestions are much appreciated. I am completely lost and incredibly tired! I've inherited an incredibly convoluted system from my predecessor, and I'm trying to find a way to solve it - or I need to be told that it just isn't possible. I've got an old site on ServerA (some kind of Linux distribution), with the domain SomeDomain.com There is a new site sitting on ServerB (Ubuntu), with the intention of having SomeDomain.com to serve it in the future (it is replacing the old site) ServerA also has a web app that is currently in use by other departments within the company (accessible at SomeDomain.com/web-app/) The goal: To have SomeDomain.com and all extensions of this domain name (sub-domains, URL's etc.) serve the new site on ServerB. BUT, the URL SomeDomain.com/web-app/ must serve the Web App on ServerA. The Catch: The ServerA is a shared server with a hosting company with VERY limiting restrictions in place - I cannot adjust DNS settings (apart from Name servers - but cannot set A records or anything, I have full access to ServerB to do as I wish). Therefore the web-app MUST be served from SomeDomain.com/web-app/ and not from a sub-domain or anything. These limitations make migrating the web-app from Server A to Server B rather undesirable, AND this web-app will be replaced in the near future, so it isn't worth the effort right now. Therefore, ultimately I will want 1 domain name to resolve to Server B's IP address most of the time, but in the event that the URL is SomeDomain.com/web-app/, it should resolve to Server A's IP. Note: The domain names don't, technically, have to resolve to one IP or another - but ultimately the URL's must stay consistent Some things I have tried: I've looked into mod_rewrite and .htaccess to try and achieve this effect, but it doesn't look like it's going to work for me - but I may have done it wrong (On Server B, I just checked if the request URI was /web-app/ and tried to serve the /web-app/ folder on Server A) I do have the ability to modify the name servers on both servers I am not able to make a sub domain on Server A that points back to Server A (I assume because the hosting company's servers use the URL to determine what site the serve). I figured this could be good as I'd could set an A record on Server B to point to the web app on Server A - but alas, Server A requires SomeDomain.com. If there is any more information I can give, please let me know. I need a nudge in the right direction, ideas or a solution.

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  • Pushing Large Files to 500+ Computers [closed]

    - by WMIF
    I work with a team to manage 500-600 rented Windows 7 computers for an annual conference. We have a large amount of data that needs to be synced to these computers, up to 1 TiB. The computers are divided into rooms and connected through unmanaged gigabit switches. We prepare these computers ahead of time with the Windows installation and configuration, plus any files that we have available to us before we send the base image in for replication by the rental company. Every year, we have presenters approach on site with up to gigs of data that need to be pushed to the room that they will be presenting in. Sometimes they only have a few files that are small sizes, such as a slide PDF, but can sometimes be much larger 5 GiB. Our current strategy for pushing these files is using batch scripts and RoboCopy. For the large pushes, we actually use a BitTorrent client to generate a torrent file, and then we use the batch-RoboCopy to push the torrent into a folder on the remote machines that is being monitored by an installed BT client. Often times, this data needs to be pushed immediately with a small time window. We have several machines in a control room that are identical to the machines on the floor that we use for these pushes. We occasionally have a need to execute a program on the remote machines, and we currently use batch and PSexec to handle this task. We would love to be able to respond to these last minute pushes with "sorry, your own fault", but it won't happen. The BT method has allowed us to have a much faster response time, but the whole batch process can get messy when there are multiple jobs being pushed. We use Enterprise Ghost for other processes, and it doesn't work well in this large of scale, plus it is really quite expensive for a once-a-year task like this. EDIT: There is a hard requirement that the remote machines on the floor are running Windows. The control machines do not have a hard OS requirement. I would really like to stay away from Multicast because of complications with upstream routers. Is Multicast or BitTorrent the better way to go on this? Is there another protocol that might work better?

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  • Should I break contract early?

    - by cbang
    About 7 months ago I made the switch from a 5 year permie role (as a support developer in C#) to a contract role. I did this because I was stagnating in my old role. The extra cash contracting is really helping too. Unfortunately my team leader has taken a dislike to me from day 1. He regularly tells me I went out contracting too early, and frequently remarks that people in their 20's have no idea what they are talking about (I am 29). I was recently given the task of configuring our reports via our in house reporting library. It works off of a database driven criteria base, with controls being loaded as needed. The configs can get fairly complex, with controls having various levels of dependency on each other. I had a short time frame to get 50 reports working, and I was told to just get the basic configuration done, after which they will be handed over to the reporting team for fine tuning, then the test team. Our updated system was deployed 2 weeks ago, and it turned out that about 15 reports had issues causing incorrect data to be returned. Upon investigation I discovered that the reporting team hadn't even looked at them, and the test team hadn't bothered to test the reports. In spite of this, my team leader has told me that it is 100% my fault. As a result, our help desk got hit hard. I worked back until 2am that night to fix the highest priority issues (on my wedding anniversary!). The next day I arrive at work at 7:45 am to continue with the fixes. I got no thanks, but keep getting repeatedly told by my manager that "I fucked up" and "this is all my fault". I told my team leader I would spend part of my weekend working to fix the remaining issues. His response was "so you fucking should! you fucked it all up!" in front of the rest of the team. I responded "No worries." and left. I spent a decent chunk of my weekend working on it. Within 2 business days of finding out about the issues, I had all the medium and high priority issues fixed. The only comments my team leader has made to me in the last 2 weeks is to tell me how I have caused a big mess, and to tell me it was all my fault. I get this multiple times a day. If I make any jokes to anyone else in the team, I get told not to be a smartass... even though the rest of the team jokes throughout the day. Apart from that, all I get is angry looks any time I am anywhere near the guy. I don't give any response other than "alright" or silence when he starts giving me a hard time. Today we found out that the pilot release for the next stage has been pushed back. My team leader has said this was caused by me (but the higher ups said no such thing). He also said I have "no understanding of the ramifications of my actions". My question is, should I break contract (I am contracted until June 30) and find another role? No one else in my team will speak up in my favour, as they are contractors too and have no interest in rocking the boat. I could complain to my team leaders boss, but I can't see that helping, as I will still be stuck in the same team. As this is my first contract, I imagine getting the next one will be hard without a reference. I can't figure out if this guy is trying to get me fired up to provoke a confrontation (the guy loves conflict), or if he is just venting anger, or what. Copping this blame day after day is really wearing me down and making me depressed... especially since I have a wife and kid to support).

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  • Exchange Server 2007 Setup

    - by AlamedaDad
    Hi, I'm working on a upgrade to Exchange 2007 and I wanted to get some advise on hardware choices. We currently have an Exchange 2003 STD server with 400 users split between 6 AD Sites, that is housed on a single server. We need to move to a redundant, fault tolerant system to support our users. I'm planning on installing 2 Dell 1950 servers with W2k8-std to act as CAS and Hub servers, with NLB to allow abstraction of the actual server name to the users. There won't be an edge system since we have a Barracuda box already that will handle in/out spam/virus filtering. Backend I'm planning on 2 mailbox servers which will be Dell 2950s with 16GB RAM, 2 either dual-core or quad-core CPUs and 6 300GB SAS drives in some RAID config. These systems will be clustered using W2k8 Ent clustering and running CCR in Exchange. My questions are as follows: Is 16GB enough RAM for serving that many mailboxes along with the windows clustering and ccr? I'm trying to figure out disk layouts and I'm unsure of whether to use all local disk or some local and some SAN, via an OpenFiler iSCSI server. The SAN would be a Dell 2850 with 6 - 300GB SCSI drives and a PERC controller to slice as I want, with 8GB RAM. Option 1: 2 drives, RAID 1 - OS 2 drives, RAID 1 - Logs 2 drives, RAID 1 - Mail stores Option 2: 2 drives, RAID 1 - OS and logs 4 drives, RAID 5 - Mail Stores and scratch space for eseutil. Option 3: 2 drives, RAID 1 - OS 2 drives, RAID 1 - Logs 2 drives, RAID 0 - scratch space ~300GB iSCSI volume for mail stores Option 4: 2 drives, RAID 1 - OS 4 drives, RAID 5 - scratch space ~300GB iSCSI volume for mail stores ~300GB iSCSI volume for logs I have 2 sockets for CPUs and need to chose between dual and quad cores. The dual core have faster clocks but less cache and I'm thinking older architecture. Am I better off with more cores and cache while sacraficing clock speed? I am planning on adding the new E2K7 cluster to the E2K3 server and then move each mailbox over, all at once, then remove the old server. This seems more complicated than simply getting rid of the 2003 server and then adding the 2007 cluster and restoring the mailboxes using PowerControls or exmerge. The migration option lets me do this on my time, where a cutover means it all needs to work at once. If I go with the cutover method, how can I prebuild the servers and add them to the domain right after removing the 2003 server, or can't I? I think the answer is no and the migration is my only real option if I want to prebuild. I need to also migrate about 30GB of Public Folders. Is there anything special about this, other than specifying in the E2K7 install that I want older Outlook clients and PF's setup? I guess I could even keep the E2K3 server to host just the PFs? Lastly, if I have a mix of Outlook 200, 2003 and 2007 what do I need to do to make sure they all have access to the GAL and OAB? At time of cutover, we'll be at like 90% 2007, but we will have some older stuff around. My plan is to use Outlook Anywhere on laptops that are used outside the physical network. Are there any gotchas involved in that? I'm even thinking about using is for all Outlook clients, does anyone do that? The reason I'm considering it is that our WAN is really VPN tunnels over internet connections, so not a fully messhed, stable WAN. Thank you all very much for the assistance in advance and I look forward to discussion of these points! Regards...Michael

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  • Logging to MySQL without empty rows/skipped records?

    - by Lee Ward
    I'm trying to figure out how to make Squid proxy log to MySQL. I know ACL order is pretty important but I'm not sure if I understand exactly what ACLs are or do, it's difficult to explain, but hopefully you'll see where I'm going with this as you read! I have created the lines to make Squid interact with a helper in squid.conf as follows: external_acl_type mysql_log %LOGIN %SRC %PROTO %URI php /etc/squid3/custom/mysql_lg.php acl ex_log external mysql_log http_access allow ex_log The external ACL helper (mysql_lg.php) is a PHP script and is as follows: error_reporting(0); if (! defined(STDIN)) { define("STDIN", fopen("php://stdin", "r")); } $res = mysql_connect('localhost', 'squid', 'testsquidpw'); $dbres = mysql_select_db('squid', $res); while (!feof(STDIN)) { $line = trim(fgets(STDIN)); $fields = explode(' ', $line); $user = rawurldecode($fields[0]); $cli_ip = rawurldecode($fields[1]); $protocol = rawurldecode($fields[2]); $uri = rawurldecode($fields[3]); $q = "INSERT INTO logs (id, user, cli_ip, protocol, url) VALUES ('', '".$user."', '".$cli_ip."', '".$protocol."', '".$uri."');"; mysql_query($q) or die (mysql_error()); if ($fault) { fwrite(STDOUT, "ERR\n"); }; fwrite(STDOUT, "OK\n"); } The configuration I have right now looks like this: ## Authentication Handler auth_param ntlm program /usr/bin/ntlm_auth --helper-protocol=squid-2.5-ntlmssp auth_param ntlm children 30 auth_param negotiate program /usr/bin/ntlm_auth --helper-protocol=squid-2.5-basic auth_param negotiate children 5 # Allow squid to update log external_acl_type mysql_log %LOGIN %SRC %PROTO %URI php /etc/squid3/custom/mysql_lg.php acl ex_log external mysql_log http_access allow ex_log acl localnet src 172.16.45.0/24 acl AuthorizedUsers proxy_auth REQUIRED acl SSL_ports port 443 acl Safe_ports port 80 # http acl Safe_ports port 21 # ftp acl Safe_ports port 443 # https acl CONNECT method CONNECT acl blockeddomain url_regex "/etc/squid3/bl.acl" http_access deny blockeddomain deny_info ERR_BAD_GENERAL blockeddomain # Deny requests to certain unsafe ports http_access deny !Safe_ports # Deny CONNECT to other than secure SSL ports http_access deny CONNECT !SSL_ports # Allow the internal network access to this proxy http_access allow localnet # Allow authorized users access to this proxy http_access allow AuthorizedUsers # FINAL RULE - Deny all other access to this proxy http_access deny all From testing, the closer to the bottom I place the logging lines the less it logs. Oftentimes, it even places empty rows in to the MySQL table. The file-based logs in /var/log/squid3/access.log are correct but many of the rows in the access logs are missing from the MySQL logs. I can't help but think it's down to the order I'm putting lines in because I want to log everything to MySQL, unauthenticated requests, blocked requests, which category blocked a specific request. The reason I want this in MySQL is because I'm trying to have everything managed via a custom web-based frontend and want to avoid using any shell commands and access to system log files if I can help it. The end result is to make it as easy as possible to maintain without keeping staff waiting on the phone whilst I add a new rule and reload the server! Hopefully someone can help me out here because this is very much a learning experience for me and I'm pretty stumped. Many thanks in advance for any help!

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  • MongoDB Crashed,Not able to start it again

    - by Kevin Parker
    Mongodb fail to start after showing this error...and not able to start it again..?Can u help me find out? *** glibc detected *** /usr/lib/mongodb/mongo: corrupted double-linked list: 0x000000000f750b50 *** Mon Nov 26 19:01:29 mongo got signal 11 (Segmentation fault), stack trace: ======= Backtrace: ========= /lib/x86_64-linux-gnu/libc.so.6(+0x788d6)[0x2b2db94198d6] /lib/x86_64-linux-gnu/libc.so.6(+0x7a841)[0x2b2db941b841] /lib/x86_64-linux-gnu/libc.so.6(cfree+0x73)[0x2b2db941f603] /usr/lib/mongodb/mongo(_ZN5boost6detail17sp_counted_impl_pIN5mongo7BSONObj6HolderEE7disposeEv+0x12)[0x45bd92] /usr/lib/mongodb/mongo(_ZN5boost6detail12shared_countD2Ev+0x49)[0x45d319] /lib/x86_64-linux-gnu/libc.so.6(exit+0xe1)[0x2b2db93da961] /usr/lib/mongodb/mongo(_Z10quitNicelyi+0x53)[0x458043] /lib/x86_64-linux-gnu/libpthread.so.0(+0xfc60)[0x2b2db753fc60] /lib/x86_64-linux-gnu/libc.so.6(kill+0x7)[0x2b2db93d4fe7] /lib/libreadline.so.6(+0x25888)[0x2b2db889b888] /lib/libreadline.so.6(rl_getc+0x5e)[0x2b2db889d9de] /lib/libreadline.so.6(rl_read_key+0xf8)[0x2b2db889e0c8] /lib/libreadline.so.6(readline_internal_char+0x61)[0x2b2db8889061] /lib/libreadline.so.6(readline+0x55)[0x2b2db88895b5] /usr/lib/mongodb/mongo(_Z13shellReadlinePKci+0x8a)[0x45694a] /usr/lib/mongodb/mongo(_Z5_mainiPPc+0x1506)[0x45a1a6] /usr/lib/mongodb/mongo(main+0x26)[0x45b1d6] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xff)[0x2b2db93bfeff] /usr/lib/mongodb/mongo[0x456449] ======= Memory map: ======== 00400000-0055c000 r-xp 00000000 fd:03 32385496 /usr/lib/mongodb/mongo 0075c000-00762000 r--p 0015c000 fd:03 32385496 /usr/lib/mongodb/mongo 00762000-00765000 rw-p 00162000 fd:03 32385496 /usr/lib/mongodb/mongo 00765000-00767000 rw-p 00765000 00:00 0 0f74e000-0f961000 rw-p 0f74e000 00:00 0 [heap] 2b2db730d000-2b2db732e000 r-xp 00000000 fd:03 32112840 /lib/x86_64-linux-gnu/ld-2.13.so 2b2db732e000-2b2db7331000 rw-p 2b2db732e000 00:00 0 2b2db7331000-2b2db7351000 rwxp 2b2db7331000 00:00 0 2b2db752d000-2b2db752e000 r--p 00020000 fd:03 32112840 /lib/x86_64-linux-gnu/ld-2.13.so 2b2db752e000-2b2db7530000 rw-p 00021000 fd:03 32112840 /lib/x86_64-linux-gnu/ld-2.13.so 2b2db7530000-2b2db7548000 r-xp 00000000 fd:03 32112843 /lib/x86_64-linux-gnu/libpthread-2.13.so 2b2db7548000-2b2db7748000 ---p 00018000 fd:03 32112843 /lib/x86_64-linux-gnu/libpthread-2.13.so 2b2db7748000-2b2db7749000 r--p 00018000 fd:03 32112843 /lib/x86_64-linux-gnu/libpthread-2.13.so 2b2db7749000-2b2db774a000 rw-p 00019000 fd:03 32112843 /lib/x86_64-linux-gnu/libpthread-2.13.so 2b2db774a000-2b2db774e000 rw-p 2b2db774a000 00:00 0 2b2db774e000-2b2db7836000 r-xp 00000000 fd:03 32380634 /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.14 2b2db7836000-2b2db7a35000 ---p 000e8000 fd:03 32380634 /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.14 2b2db7a35000-2b2db7a3d000 r--p 000e7000 fd:03 32380634 /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.14 2b2db7a3d000-2b2db7a3f000 rw-p 000ef000 fd:03 32380634 /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.14 2b2db7a3f000-2b2db7a55000 rw-p 2b2db7a3f000 00:00 0 2b2db7a55000-2b2db7a58000 r-xp 00000000 fd:03 32244866 /usr/lib/libboost_system.so.1.42.0 2b2db7a58000-2b2db7c57000 ---p 00003000 fd:03 32244866 /usr/lib/libboost_system.so.1.42.0 2b2db7c57000-2b2db7c58000 r--p 00002000 fd:03 32244866 /usr/lib/libboost_system.so.1.42.0 2b2db7c58000-2b2db7c59000 rw-p 00003000 fd:03 32244866 /usr/lib/libboost_system.so.1.42.0 2b2db7c59000-2b2db7c6d000 r-xp 00000000 fd:03 32244882 /usr/lib/libboost_thread.so.1.42.0 2b2db7c6d000-2b2db7e6c000 ---p 00014000 fd:03 32244882 /usr/lib/libboost_thread.so.1.42.0 2b2db7e6c000-2b2db7e6e000 r--p 00013000 fd:03 32244882 /usr/lib/libboost_thread.so.1.42.0 2b2db7e6e000-2b2db7e6f000 rw-p 00015000 fd:03 32244882 /usr/lib/libboost_thread.so.1.42.0 2b2db7e6f000-2b2db7e83000 r-xp 00000000 fd:03 32244880 /usr/lib/libboost_filesystem.so.1.42.0 2b2db7e83000-2b2db8082000 ---p 00014000 fd:03 32244880 Mon Nov 26 19:01:29 mongo got signal 6 (Aborted), stack trace: Mon Nov 26 19:01:29 0x45e03f 0x457694 0x2b2db93d4d80 0x2b2db93d4d05 0x2b2db93d8ab6 0x2b2db940fa9b 0x2b2db94198d6 0x2b2db941b841 0x2b2db941f603 0x45bd92 0x45d319 0x2b2db93da961 0x458043 0x2b2db753fc60 0x2b2db93d4fe7 0x2b2db889b888 0x2b2db889d9de 0x2b2db889e0c8 0x2b2db8889061 0x2b2db88895b5 /usr/lib/mongodb/mongo(_ZN5mongo15printStackTraceERSo+0x1f) [0x45e03f] /usr/lib/mongodb/mongo(_Z12quitAbruptlyi+0x324) [0x457694] /lib/x86_64-linux-gnu/libc.so.6(+0x33d80) [0x2b2db93d4d80] /lib/x86_64-linux-gnu/libc.so.6(gsignal+0x35) [0x2b2db93d4d05] /lib/x86_64-linux-gnu/libc.so.6(abort+0x186) [0x2b2db93d8ab6] /lib/x86_64-linux-gnu/libc.so.6(+0x6ea9b) [0x2b2db940fa9b] /lib/x86_64-linux-gnu/libc.so.6(+0x788d6) [0x2b2db94198d6] /lib/x86_64-linux-gnu/libc.so.6(+0x7a841) [0x2b2db941b841] /lib/x86_64-linux-gnu/libc.so.6(cfree+0x73) [0x2b2db941f603] /usr/lib/mongodb/mongo(_ZN5boost6detail17sp_counted_impl_pIN5mongo7BSONObj6HolderEE7disposeEv+0x12) [0x45bd92] /usr/lib/mongodb/mongo(_ZN5boost6detail12shared_countD2Ev+0x49) [0x45d319] /lib/x86_64-linux-gnu/libc.so.6(exit+0xe1) [0x2b2db93da961] /usr/lib/mongodb/mongo(_Z10quitNicelyi+0x53) [0x458043] /lib/x86_64-linux-gnu/libpthread.so.0(+0xfc60) [0x2b2db753fc60] /lib/x86_64-linux-gnu/libc.so.6(kill+0x7) [0x2b2db93d4fe7] /lib/libreadline.so.6(+0x25888) [0x2b2db889b888] /lib/libreadline.so.6(rl_getc+0x5e) [0x2b2db889d9de] /lib/libreadline.so.6(rl_read_key+0xf8) [0x2b2db889e0c8] /lib/libreadline.so.6(readline_internal_char+0x61) [0x2b2db8889061] /lib/libreadline.so.6(readline+0x55) [0x2b2db88895b5] Any One have any idea?Why MongoDb Crashed? OS:ubuntu 11.04 2.6.32-pony6-3 RAM:2 GB

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  • Formula to calculate probability of unrecoverable read error during RAID rebuild

    - by OlafM
    I need to compare the reliability of different RAID systems with either consumer or enterprise drives. The formula to have the probability of success of a rebuild, ignoring mechanical problems, is simple: error_probability = 1 - (1-per_bit_error_rate)^bit_read and with 3 TB drives I get 38% probability to experience an URE (unrecoverable read error) for a 2+1 disks RAID5 (4.7% for enterprise drives) 21% for a RAID1 (2.4% for enterprise drives) 51% probability of error during recovery for the 3+1 RAID5 often used by users of SOHO products like Synologys. Most people don't know about this. Calculating the error for single disk tolerance is easy, my question concerns systems tolerant to multiple disks failures (RAID6/Z2, RAIDZ3 and RAID1 with multiple disks). If only the first disk is used for rebuild and the second one is read again from the beginning in case or an URE, then the error probability is the one calculated above squared (14.5% for consumer RAID5 2+1, 4.5% for consumer RAID1 1+2). However, I suppose (at least in ZFS that has full checksums!) that the second parity/available disk is read only where needed, meaning that only few sectors are needed: how many UREs can possibly happen in the first disk? not many, otherwise the error probability for single-disk tolerance systems would skyrocket even more than I calculated. If I'm correct, a second parity disk would practically lower the risk to extremely low values. Am I correct?

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  • Oracle Virtual Server OEL vm fails to start - kernel panic on cpu identify

    - by Towndrunk
    I am in the process of following a guide to setup various oracle vm templates, so far I have installed OVS 2. 2 and got the OVM Manager working, imported the template for OEL5U5 and created a vm from it.. the problem comes when starting that vm. The log in the OVMM console shows the following; Update VM Status - Running Configure CPU Cap Set CPU Cap: failed:<Exception: failed:<Exception: ['xm', 'sched-credit', '-d', '32_EM11g_OVM', '-c', '0'] => Error: Domain '32_EM11g_OVM' does not exist. StackTrace: File "/opt/ovs-agent-2.3/OVSXXenVMConfig.py", line 2531, in xen_set_cpu_cap run_cmd(args=['xm', File "/opt/ovs-agent-2.3/OVSCommons.py", line 92, in run_cmd raise Exception('%s => %s' % (args, err)) The xend.log shows; [2012-11-12 16:42:01 7581] DEBUG (DevController:139) Waiting for devices vtpm [2012-11-12 16:42:01 7581] INFO (XendDomain:1180) Domain 32_EM11g_OVM (3) unpaused. [2012-11-12 16:42:03 7581] WARNING (XendDomainInfo:1907) Domain has crashed: name=32_EM11g_OVM id=3. [2012-11-12 16:42:03 7581] ERROR (XendDomainInfo:2041) VM 32_EM11g_OVM restarting too fast (Elapsed time: 11.377262 seconds). Refusing to restart to avoid loops .> [2012-11-12 16:42:03 7581] DEBUG (XendDomainInfo:2757) XendDomainInfo.destroy: domid=3 [2012-11-12 16:42:12 7581] DEBUG (XendDomainInfo:2230) Destroying device model [2012-11-12 16:42:12 7581] INFO (image:553) 32_EM11g_OVM device model terminated I have set_on_crash="preserve" in the vm.cfg and have then run xm create -c to get the console screen while booting and this is the log of what happens.. Started domain 32_EM11g_OVM (id=4) Bootdata ok (command line is ro root=LABEL=/ ) Linux version 2.6.18-194.0.0.0.3.el5xen ([email protected]) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-48)) #1 SMP Mon Mar 29 18:27:00 EDT 2010 BIOS-provided physical RAM map: Xen: 0000000000000000 - 0000000180800000 (usable)> No mptable found. Built 1 zonelists. Total pages: 1574912 Kernel command line: ro root=LABEL=/ Initializing CPU#0 PID hash table entries: 4096 (order: 12, 32768 bytes) Xen reported: 1600.008 MHz processor. Console: colour dummy device 80x25 Dentry cache hash table entries: 1048576 (order: 11, 8388608 bytes) Inode-cache hash table entries: 524288 (order: 10, 4194304 bytes) Software IO TLB disabled Memory: 6155256k/6299648k available (2514k kernel code, 135548k reserved, 1394k data, 184k init) Calibrating delay using timer specific routine.. 4006.42 BogoMIPS (lpj=8012858) Security Framework v1.0.0 initialized SELinux: Initializing. selinux_register_security: Registering secondary module capability Capability LSM initialized as secondary Mount-cache hash table entries: 256 CPU: L1 I Cache: 64K (64 bytes/line), D cache 16K (64 bytes/line) CPU: L2 Cache: 2048K (64 bytes/line) general protection fault: 0000 [1] SMP last sysfs file: CPU 0 Modules linked in: Pid: 0, comm: swapper Not tainted 2.6.18-194.0.0.0.3.el5xen #1 RIP: e030:[ffffffff80271280] [ffffffff80271280] identify_cpu+0x210/0x494 RSP: e02b:ffffffff80643f70 EFLAGS: 00010212 RAX: 0040401000810008 RBX: 0000000000000000 RCX: 00000000c001001f RDX: 0000000000404010 RSI: 0000000000000001 RDI: 0000000000000005 RBP: ffffffff8063e980 R08: 0000000000000025 R09: ffff8800019d1000 R10: 0000000000000026 R11: ffff88000102c400 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffffffff805d2000(0000) knlGS:0000000000000000 CS: e033 DS: 0000 ES: 0000 Process swapper (pid: 0, threadinfo ffffffff80642000, task ffffffff804f4b80) Stack: 0000000000000000 ffffffff802d09bb ffffffff804f4b80 0000000000000000 0000000021100800 0000000000000000 0000000000000000 ffffffff8064cb00 0000000000000000 0000000000000000 Call Trace: [ffffffff802d09bb] kmem_cache_zalloc+0x62/0x80 [ffffffff8064cb00] start_kernel+0x210/0x224 [ffffffff8064c1e5] _sinittext+0x1e5/0x1eb Code: 0f 30 b8 73 00 00 00 f0 0f ab 45 08 e9 f0 00 00 00 48 89 ef RIP [ffffffff80271280] identify_cpu+0x210/0x494 RSP ffffffff80643f70 0 Kernel panic - not syncing: Fatal exception clear as mud to me. are there any other logs that will help me? I have now deployed another vm from the same template and used the default vm settings rather than adding more memory etc - I get exactly the same error.

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  • Just a few questions about Hyper-V virtual machines and clustering

    - by René Kåbis
    I have been using Microsoft’s Hyper-V technology for a little while now, but I am just now dipping my toe into clustering. In particular, I am trying to implement a fault-tolerant SQL DB. This involves setting up two VMs, clustering them via Failover Cluster, and then installing SQL Server in some fashion. I have two physical machines - one high-end and rather beefy “heavy lifter” to contain the majority of the VMs, and another “backup” (a repurposed desktop) to hold the essential “secondary” (or failover) AD-DC, SQL and FS VMs. The main reason why I find the failover cluster at the VM level so attractive is that it presents a single IP and DNS entry to the network as a whole - if one machine (physical or virtual) goes down, you might loose some ping and the connections get reset, but the network applications (Microsoft RMS connection to backend SQL) can still connect to a viable DB without having to mess around with the settings at all. My first question is in terms of SQL Server itself. If I have a cluster between two VMs, does it make more sense to install the SQL Server in Failover Cluster configuration or should I simply install it in a stand-alone config and mirror the DBs? For example, this post suggests just mirroring the DBs, but do I just mirror standalone DBs on standalone VMs, or can I get the network and failover benefits of clustered VMs while still utilizing (on each clustered VM) standalone DBs that have been mirrored between each other? As well, I have come across a lot of documentation about SQL clustering, but most assume a number (#2) of physical machines to hold not only the actual SQL VMs but also the Quorum and Witness stores. I will not be able to muster more than two physical machines. As such, I will have to be satisfied with a VM cluster that does not exceed two VMs (one for each physical machine). Another issue involves MSDTC - the Distributed Transaction Coordinator. When attempting to install the SQL Failover Cluster (I never completed it for this reason) it threw a hissy fit because MSDTC had not been clustered. Search as I might, I have not yet found a way to do so under Windows Server 2012 R2. I have found plenty of docs for Windows 2008 and 2008 R2, but these instructions don’t align with 2012 R2 (at least, not in a way that allows me to successfully cluster MSDTC). Plus, some of the instructions that I have found for SQL Server Failover Cluster installation suggest that a third “network device” - shared network storage (a SAN) - is required for the DB itself (and other functionality). I do not have this, and won’t be getting this. Most of my storage exists on the “heavy lifter” that was designed for all of the “primary” VMs. If that physical machine goes down, so does the storage. The secondary server does have enough resources for an AD-DC Server, an SQL server and a File Server, so it will handle the “secondary” failover versions of those VMs (clustered or not). My final question involves file servers. If I cluster file servers between two VMs (one on my “heavy lifter” and another on my “backup”, how do I mirror the data between them? Clustering VMs only provides a single point of access on the network for a resource, it doesn’t exactly replicate data between the two - that is left to the services that serve up that data. I am unsure how I can ensure that file server data between two clustered file server VMs can be properly mirrored. Remember, I only have two devices to be used here - my primary machine and a backup secondary. There is no chance of me obtaining a SAN or any other type of network attached storage. What exists on the machines must act as the storage. Thanks in advance for any suggestions.

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  • Windows Service SearchIndexer.exe Crashes on Indexing

    - by Josh Jay
    Relevant Specs: Windows 7 Professional 64-bit SP1 Outlook 2010 Version 14.0.7116.5000 (32-bit) Original Symptom: In outlook, I attempted to search for an email but nothing ever returned and the indicator kept going like it was searching. Attempted Resolutions: I investigated the search options and with some research noticed the Windows Service "Windows Search" (SearchIndexer.exe) was not running. I attempted to start it but I receive this error message: "Windows could not start the Windows Search service on Local Computer. Error 1067: The process terminated unexpectedly." The Event Viewer gives this error entry: Log Name: Application Source: Application Error Date: 6/3/2014 11:02:05 AM Event ID: 1000 Task Category: (100) Level: Error Keywords: Classic User: N/A Computer: ***REMOVED FOR POST*** Description: Faulting application name: SearchIndexer.exe, version: 7.0.7601.17610, time stamp: 0x4dc0d019 Faulting module name: KERNELBASE.dll, version: 6.1.7601.18229, time stamp: 0x51fb1677 Exception code: 0xc0000005 Fault offset: 0x000000000000940d Faulting process id: 0x6a0 Faulting application start time: 0x01cf7f3cc83757c6 Faulting application path: C:\Windows\system32\SearchIndexer.exe Faulting module path: C:\Windows\system32\KERNELBASE.dll Report Id: 06424160-eb30-11e3-9555-843a4b07b336 Event Xml: <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"> <System> <Provider Name="Application Error" /> <EventID Qualifiers="0">1000</EventID> <Level>2</Level> <Task>100</Task> <Keywords>0x80000000000000</Keywords> <TimeCreated SystemTime="2014-06-03T15:02:05.000000000Z" /> <EventRecordID>602923</EventRecordID> <Channel>Application</Channel> <Computer>M6700-12011.ncaa.org</Computer> <Security /> </System> <EventData> <Data>SearchIndexer.exe</Data> <Data>7.0.7601.17610</Data> <Data>4dc0d019</Data> <Data>KERNELBASE.dll</Data> <Data>6.1.7601.18229</Data> <Data>51fb1677</Data> <Data>c0000005</Data> <Data>000000000000940d</Data> <Data>6a0</Data> <Data>01cf7f3cc83757c6</Data> <Data>C:\Windows\system32\SearchIndexer.exe</Data> <Data>C:\Windows\system32\KERNELBASE.dll</Data> <Data>06424160-eb30-11e3-9555-843a4b07b336</Data> </EventData> </Event> The regular windows search (from start menu) works fine, and if I reboot the machine the service starts up OK but as soon as it kicks off when I let the machine idle for long enough it crashes (same Event Viewer entry). We also tried the Microsoft Utility to no avail. Has anyone seen this issue before?

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  • RAID controller dropping the wrong drive

    - by bramp
    I've been having an issue with 3ware 9500S-8 RAID 10, and I have contracted their tech support, but I wanted to hear the serverfault community's recommendations. Firstly, all my data is backuped and secure, so I don't mind blowing my RAID away if I have to. But let me describe the problem I've been seeing. A month ago, disk 6 dropped out of the RAID. It is mirrored with disk 7, so I wasn't that bothered. I went to the data centre and replaced it. When I got back to the office, I noticed that disk 6 will still not in the RAID, and in fact the controller was show the name of the old drive still. A week later I went back and replace the drive again, thinking I might have swapped in a bad drive. Still the same problem. I decided to reboot the machine, to see if that would "force" the controller into seeing the new drive. It did, and a rebuild started to happen (from disk 7). Eventually both drives were showing as good. A week later, the MySQL database has flagged the database is corrupt, and is unable to repair it. I don't know what has gone wrong, but I suspected this 6-7 pair. At this point I noticed that the RAID had constantly been verifying itself, over and over. Regardless of this I began to rebuild the database, which took about 19 hours. It's a big database. Near the end of the repair, the RAID controller told me it had dropped disk 7, and that some data was most likely corrupted. I contacted LSI tech support, and they very promptly started to help me. I mentioned that drive 7 had been dropped. They suspect that drive 7 was always at fault, and drive 6 had always been good. I want to know how often a RAID controller would drop the wrong drive (in this case dropping drive 6 a month ago, instead of 7). I foolishly didn't run smartctl on the drives before I started swapping them out. I just assumed the RAID controller knew what it was talking about. I think my plan of action is to replace drive 7, rebuild the array from scratch, double check smartctl on ALL the disks, and then start restoring my data again. I would appreciate anyone's input on what the correct procedure for swapping drives is, and how often failures like this happen. If anyone would like more information then I'd be happy to provide it. thanks in advance. Oh some more information. I'm running CentOS 5.3, with two RAID arrays, a simple RAID 1 for the OS, and RAID 10 for the database. Both arrays are on different controllers. The RAID 10 is made of 10 identical ST3640323AS drives, until I swapped in a SAMSUNG HD103SJ last month.

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  • Squid - Logging to MySQL without empty rows/skipped records?

    - by Lee Ward
    I'm trying to figure out how to make Squid proxy log to MySQL. I know ACL order is pretty important but I'm not sure if I understand exactly what ACLs are or do, it's difficult to explain, but hopefully you'll see where I'm going with this as you read! I have created the lines to make Squid interact with a helper in squid.conf as follows: external_acl_type mysql_log %LOGIN %SRC %PROTO %URI php /etc/squid3/custom/mysql_lg.php acl ex_log external mysql_log http_access allow ex_log The external ACL helper (mysql_lg.php) is a PHP script and is as follows: error_reporting(0); if (! defined(STDIN)) { define("STDIN", fopen("php://stdin", "r")); } $res = mysql_connect('localhost', 'squid', 'testsquidpw'); $dbres = mysql_select_db('squid', $res); while (!feof(STDIN)) { $line = trim(fgets(STDIN)); $fields = explode(' ', $line); $user = rawurldecode($fields[0]); $cli_ip = rawurldecode($fields[1]); $protocol = rawurldecode($fields[2]); $uri = rawurldecode($fields[3]); $q = "INSERT INTO logs (id, user, cli_ip, protocol, url) VALUES ('', '".$user."', '".$cli_ip."', '".$protocol."', '".$uri."');"; mysql_query($q) or die (mysql_error()); if ($fault) { fwrite(STDOUT, "ERR\n"); }; fwrite(STDOUT, "OK\n"); } The configuration I have right now looks like this: ## Authentication Handler auth_param ntlm program /usr/bin/ntlm_auth --helper-protocol=squid-2.5-ntlmssp auth_param ntlm children 30 auth_param negotiate program /usr/bin/ntlm_auth --helper-protocol=squid-2.5-basic auth_param negotiate children 5 # Allow squid to update log external_acl_type mysql_log %LOGIN %SRC %PROTO %URI php /etc/squid3/custom/mysql_lg.php acl ex_log external mysql_log http_access allow ex_log acl localnet src 172.16.45.0/24 acl AuthorizedUsers proxy_auth REQUIRED acl SSL_ports port 443 acl Safe_ports port 80 # http acl Safe_ports port 21 # ftp acl Safe_ports port 443 # https acl CONNECT method CONNECT acl blockeddomain url_regex "/etc/squid3/bl.acl" http_access deny blockeddomain deny_info ERR_BAD_GENERAL blockeddomain # Deny requests to certain unsafe ports http_access deny !Safe_ports # Deny CONNECT to other than secure SSL ports http_access deny CONNECT !SSL_ports # Allow the internal network access to this proxy http_access allow localnet # Allow authorized users access to this proxy http_access allow AuthorizedUsers # FINAL RULE - Deny all other access to this proxy http_access deny all From testing, the closer to the bottom I place the logging lines the less it logs. Oftentimes, it even places empty rows in to the MySQL table. The file-based logs in /var/log/squid3/access.log are correct but many of the rows in the access logs are missing from the MySQL logs. I can't help but think it's down to the order I'm putting lines in because I want to log everything to MySQL, unauthenticated requests, blocked requests, which category blocked a specific request. The reason I want this in MySQL is because I'm trying to have everything managed via a custom web-based frontend and want to avoid using any shell commands and access to system log files if I can help it. The end result is to make it as easy as possible to maintain without keeping staff waiting on the phone whilst I add a new rule and reload the server! Hopefully someone can help me out here because this is very much a learning experience for me and I'm pretty stumped. Many thanks in advance for any help!

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  • nginx + php-fpm - where are my $_GET params?

    - by egis
    I have a strange problem here. I just moved from apache + mod_php to nginx + php-fpm. Everything went fine except this one problem. I have a site, let's say example.com. When I access it like example.com?test=get_param $_SERVER['REQUEST_URI'] is /?test=get_param and there is a $_GET['test'] also. But when I access example.com/ajax/search/?search=get_param $_SERVER['REQUEST_URI'] is /ajax/search/?search=get_param yet there is no $_GET['search'] (there is no $_GET array at all). I'm using Kohana framework. which routes /ajax/search to controller, but I've put phpinfo() at index.php so I'm checking for $_GET variables before framework does anything (this means that disapearing get params aren't frameworks fault). My nginx.conf is like this worker_processes 4; pid logs/nginx.pid; events { worker_connections 1024; } http { index index.html index.php; autoindex on; autoindex_exact_size off; include mime.types; default_type application/octet-stream; server_names_hash_bucket_size 128; log_format main '$remote_addr - $remote_user [$time_local] "$request" ' '$status $body_bytes_sent "$http_referer" ' '"$http_user_agent" "$http_x_forwarded_for"'; access_log logs/access.log main; error_log logs/error.log debug; sendfile on; tcp_nopush on; tcp_nodelay off; keepalive_timeout 2; gzip on; gzip_comp_level 2; gzip_proxied any; gzip_types text/plain text/css application/x-javascript text/xml application/xml application/xml+rss text/javascript; include sites-enabled/*; } and example.conf is like this server { listen 80; server_name www.example.com; rewrite ^ $scheme://example.com$request_uri? permanent; } server { listen 80; server_name example.com; root /var/www/example/; location ~ /\. { return 404; } location / { try_files $uri $uri/ /index.php; } location ~ \.php$ { fastcgi_pass 127.0.0.1:9000; fastcgi_index index.php; fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; include /usr/local/nginx/conf/fastcgi_params; } location ~* ^/(modules|application|system) { return 403; } # serve static files directly location ~* ^.+.(jpg|jpeg|gif|css|png|js|ico|html|xml|txt)$ { access_log off; expires 30d; } } fastcgi_params is like this fastcgi_param QUERY_STRING $query_string; fastcgi_param REQUEST_METHOD $request_method; fastcgi_param CONTENT_TYPE $content_type; fastcgi_param CONTENT_LENGTH $content_length; fastcgi_param SCRIPT_NAME $fastcgi_script_name; fastcgi_param REQUEST_URI $request_uri; fastcgi_param DOCUMENT_URI $document_uri; fastcgi_param DOCUMENT_ROOT $document_root; fastcgi_param SERVER_PROTOCOL $server_protocol; fastcgi_param GATEWAY_INTERFACE CGI/1.1; fastcgi_param SERVER_SOFTWARE nginx/$nginx_version; fastcgi_param REMOTE_ADDR $remote_addr; fastcgi_param REMOTE_PORT $remote_port; fastcgi_param SERVER_ADDR $server_addr; fastcgi_param SERVER_PORT $server_port; fastcgi_param SERVER_NAME $server_name; # PHP only, required if PHP was built with --enable-force-cgi-redirect fastcgi_param REDIRECT_STATUS 200; fastcgi_connect_timeout 60; fastcgi_send_timeout 180; fastcgi_read_timeout 180; fastcgi_buffer_size 128k; fastcgi_buffers 4 256k; fastcgi_busy_buffers_size 256k; fastcgi_temp_file_write_size 256k; fastcgi_intercept_errors on; fastcgi_param QUERY_STRING $query_string; fastcgi_param PATH_INFO $fastcgi_path_info; What is the problem here? By the way there are few more sites on the same server, both Kohana based and plain php, that are working perfectly.

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  • nginx + php-fpm - where are my $_GET params?

    - by egis
    Hello everyone, I have a strange problem here. I just moved from apache + mod_php to nginx + php-fpm. Everything went fine except this one problem. I have a site, let's say example.com. When I access it like example.com?test=get_param $_SERVER['REQUEST_URI'] is /?test=get_param and there is a $_GET['test'] also. But when I access example.com/ajax/search/?search=get_param $_SERVER['REQUEST_URI'] is /ajax/search/?search=get_param yet there is no $_GET['search'] (there is no $_GET array at all). I'm using Kohana framework. which routes /ajax/search to controller, but I've put phpinfo() at index.php so I'm checking for $_GET variables before framework does anything (this means that disapearing get params aren't frameworks fault). My nginx.conf is like this worker_processes 4; pid logs/nginx.pid; events { worker_connections 1024; } http { index index.html index.php; autoindex on; autoindex_exact_size off; include mime.types; default_type application/octet-stream; server_names_hash_bucket_size 128; log_format main '$remote_addr - $remote_user [$time_local] "$request" ' '$status $body_bytes_sent "$http_referer" ' '"$http_user_agent" "$http_x_forwarded_for"'; access_log logs/access.log main; error_log logs/error.log debug; sendfile on; tcp_nopush on; tcp_nodelay off; keepalive_timeout 2; gzip on; gzip_comp_level 2; gzip_proxied any; gzip_types text/plain text/css application/x-javascript text/xml application/xml application/xml+rss text/javascript; include sites-enabled/*; } and example.conf is like this server { listen 80; server_name www.example.com; rewrite ^ $scheme://example.com$request_uri? permanent; } server { listen 80; server_name example.com; root /var/www/example/; location ~ /\. { return 404; } location / { try_files $uri $uri/ /index.php; } location ~ \.php$ { fastcgi_pass 127.0.0.1:9000; fastcgi_index index.php; fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; include /usr/local/nginx/conf/fastcgi_params; } location ~* ^/(modules|application|system) { return 403; } # serve static files directly location ~* ^.+.(jpg|jpeg|gif|css|png|js|ico|html|xml|txt)$ { access_log off; expires 30d; } } fastcgi_params is like this fastcgi_param QUERY_STRING $query_string; fastcgi_param REQUEST_METHOD $request_method; fastcgi_param CONTENT_TYPE $content_type; fastcgi_param CONTENT_LENGTH $content_length; fastcgi_param SCRIPT_NAME $fastcgi_script_name; fastcgi_param REQUEST_URI $request_uri; fastcgi_param DOCUMENT_URI $document_uri; fastcgi_param DOCUMENT_ROOT $document_root; fastcgi_param SERVER_PROTOCOL $server_protocol; fastcgi_param GATEWAY_INTERFACE CGI/1.1; fastcgi_param SERVER_SOFTWARE nginx/$nginx_version; fastcgi_param REMOTE_ADDR $remote_addr; fastcgi_param REMOTE_PORT $remote_port; fastcgi_param SERVER_ADDR $server_addr; fastcgi_param SERVER_PORT $server_port; fastcgi_param SERVER_NAME $server_name; # PHP only, required if PHP was built with --enable-force-cgi-redirect fastcgi_param REDIRECT_STATUS 200; fastcgi_connect_timeout 60; fastcgi_send_timeout 180; fastcgi_read_timeout 180; fastcgi_buffer_size 128k; fastcgi_buffers 4 256k; fastcgi_busy_buffers_size 256k; fastcgi_temp_file_write_size 256k; fastcgi_intercept_errors on; fastcgi_param QUERY_STRING $query_string; fastcgi_param PATH_INFO $fastcgi_path_info; What is the problem here? By the way there are few more sites on the same server, both Kohana based and plain php, that are working perfectly.

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