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• Connecting to localhost resolves 127.0.0.1 but connects with external IP [Linux, Debian]

  - by skgsergio

  I'm having a problem with a dedicated server, I don't known if it's the default behavior but this is the problem: If I connect to a service located on the server with localhost the service gets as source IP the external IP. Let me show an example, I use netcat for listening on 127.0.0.1:4444 xxxxxx # nc -vv -l -s 127.0.0.1 -p 4444 listening on [127.0.0.1] 4444 ... Lets check if it's ok: xxxxxx ~ # netstat -atnp | grep 4444 tcp 0 0 127.0.0.1:4444 0.0.0.0:* LISTEN 14038/nc Ok lets connect: xxxxxx ~ # nc -vv 127.0.0.1 4444 localhost [127.0.0.1] 4444 (?) open Return to the tty that have the listening process and I get this: connect to [127.0.0.1] from xxxxxx.net [176.31.xxx.xx] 50354 So that's the problem. I have a server daemon that have to listen on localhost and checks that the ip is 127.0.0.1 when the client connects but for some reason when I connect to localhost it reports the external ip... If I do the same with IPv6 it works as excepted... Detects connection as localhost (::1). Some info that can be useful: "localhost" resolves without problems to 127.0.0.1 xxxxxx ~ # ping -c1 localhost PING localhost (127.0.0.1) 56(84) bytes of data. 64 bytes from localhost (127.0.0.1): icmp_req=1 ttl=64 time=0.086 ms Nothing weird on my hosts file, I think... xxxxxx ~ # grep -v ^# /etc/hosts 127.0.0.1 localhost localhost.localdomain 176.31.xxx.xx xxxxxx.net ns1.xxxxxx.net ::1 ip6-localhost ip6-loopback feo0::0 ip6-localnet ff00::0 ip6-mcastprefix ff02::1 ip6-allnodes ff02::2 ip6-allrouters ff02::3 ip6-allhosts And ifconfig reports all ok... eth0 Link encap:Ethernet HWaddr e0:69:95:d8:30:a1 inet addr:176.31.xxx.xx Bcast:176.31.108.255 Mask:255.255.255.0 inet6 addr: 2001:41d0:8:xxxx::/64 Scope:Global inet6 addr: 2001:41d0:8:xxxx:x:xx:xx:xx/64 Scope:Global inet6 addr: fe80::e269:95ff:fed8:30a1/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:16916 errors:0 dropped:0 overruns:0 frame:0 TX packets:16914 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:8410679 (8.0 MiB) TX bytes:10539881 (10.0 MiB) Interrupt:28 Base address:0xe000 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:5570 errors:0 dropped:0 overruns:0 frame:0 TX packets:5570 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:744490 (727.0 KiB) TX bytes:744490 (727.0 KiB)

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• Why is the installation of certain programs always such a pain in Linux [closed]

  - by Saif Bechan

  I am new to Linux and I am trying to set up a server. For this I sometimes to need to install special software, but the installation of this is always such a pain. For example I wanted to try the htscanner to see if it did the job for me. When i got to the page there is NO INSTALLATION guide. I had to search for the right one on google. Even on google its a pain to find the right method. Just try it - google search.After a long search and tried different things I finally found out that I had te install some more software before it will work. The website says that the version I used did not had any dependencies. Thats a lie. Release0.8.1: No dependencies registered. You do need certain things for it to work. After managing to set it up it still didn't work I can't figure out why because there is no official guide on the website. So I wanted to just uninstall it and find a better solution. Uninstalling. Uninstalling something in Linux is a real mystery how this actually works. The best answer I got is to manually look for the files and delete them. Whats up with that! There is never something said about uninstalling on the websites. Even on the website of CentOS itself it tels you how to install something like rpmforge packages (it's a miracle they tell you and not have to google it) but there is no mention of what to do when you want to uninstall. Why not? The forums you get on when trying to solve your problem are most of the time in plain text, and you have to scroll trough huge error logs before you see somethings that vaguely resembles your question if you are lucky. The Question My question is if there are any recommended websites / forums that explain the basic concepts of installing and uninstalling software on Linux. And explain other useful operations. And not Wikipedia or the first hits of Google, I have been there already. I am looking for some easy to read trough guides on these operations on Linux. I have been on a lot of websites that explain some Linux operation, but I bet its easier to get a degree in rocket science than to read trough the website and understand what they try to say.

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• ubuntu 8.04lts + rdiff-backup: Should I install from source instead of using apt repositories?

  - by egarcia

  I'm trying to use rdiff-backup in order to make backup copies of some folders inside an Ubuntu 8.04LTS server. I'm attempting to do the backup on another server with a more modern Ubuntu distro (9.10). I'll call this one the "client". rdiff-backup needs to be installed on both the client and the server. It is available on the apt repositories on both machines, so I installed it using sudo apt-get install rdiff-backup. The problem is that the version installed on the server is older than the one on the client (1.1.15 vs 1.2.8). Thus I get errors when I try do make them work together. So I need both versions to be the same. What is the standard procedure in these cases? Should I attempt to upgrade the version on the server, or downgrade the version on the client? And how whould I do that? In case it is useful, I'd like to point out that the rdiff-backup apt-package has some dependencies - librsync1 & python-support Attaching the errors I got in case they help: rdiff-backup egarcia@test::/var/rails/ohwr/backup /home/kikito/backup/files Warning: Local version 1.2.8 does not match remote version 1.1.15. Exception ' Warning Security Violation! Bad request for function: rpath.make_file_dict with arguments: ['/var/rails/ohwr/backup'] ' raised of class '<class 'rdiff_backup.Security.Violation'>': File "/usr/lib/pymodules/python2.6/rdiff_backup/Main.py", line 304, in error_check_Main try: Main(arglist) File "/usr/lib/pymodules/python2.6/rdiff_backup/Main.py", line 321, in Main rps = map(SetConnections.cmdpair2rp, cmdpairs) File "/usr/lib/pymodules/python2.6/rdiff_backup/SetConnections.py", line 78, in cmdpair2rp return rpath.RPath(conn, filename).normalize() File "/usr/lib/pymodules/python2.6/rdiff_backup/rpath.py", line 884, in __init__ else: self.setdata() File "/usr/lib/pymodules/python2.6/rdiff_backup/rpath.py", line 908, in setdata self.data = self.conn.rpath.make_file_dict(self.path) File "/usr/lib/pymodules/python2.6/rdiff_backup/connection.py", line 450, in __call__ return apply(self.connection.reval, (self.name,) + args) File "/usr/lib/pymodules/python2.6/rdiff_backup/connection.py", line 370, in reval if isinstance(result, Exception): raise result Traceback (most recent call last): File "/usr/bin/rdiff-backup", line 30, in <module> rdiff_backup.Main.error_check_Main(sys.argv[1:]) File "/usr/lib/pymodules/python2.6/rdiff_backup/Main.py", line 304, in error_check_Main try: Main(arglist) File "/usr/lib/pymodules/python2.6/rdiff_backup/Main.py", line 321, in Main rps = map(SetConnections.cmdpair2rp, cmdpairs) File "/usr/lib/pymodules/python2.6/rdiff_backup/SetConnections.py", line 78, in cmdpair2rp return rpath.RPath(conn, filename).normalize() File "/usr/lib/pymodules/python2.6/rdiff_backup/rpath.py", line 884, in __init__ else: self.setdata() File "/usr/lib/pymodules/python2.6/rdiff_backup/rpath.py", line 908, in setdata self.data = self.conn.rpath.make_file_dict(self.path) File "/usr/lib/pymodules/python2.6/rdiff_backup/connection.py", line 450, in __call__ return apply(self.connection.reval, (self.name,) + args) File "/usr/lib/pymodules/python2.6/rdiff_backup/connection.py", line 370, in reval if isinstance(result, Exception): raise result rdiff_backup.Security.Violation: Warning Security Violation! Bad request for function: rpath.make_file_dict with arguments: ['/var/rails/ohwr/backup']

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• Apache + Tomcat error 120006 Using mod_proxy_ajp for Load Balance

  - by Wakaru44

  I have an apache 2 frontend with two nodes, and a backend with two instances of tomcat 6 balance with mod_proxy_ajp. The bbdd is in a separate machine. All machines use RHEL, 6.2 on the frontend, 5.5 on the backend. The infraestructure is virtualized using VMware. # This is the apache config in one of the virtualHost. ProxyPreserveHost On ProxyPass / balancer://liferay/ <Proxy balancer://liferay> BalancerMember ajp://lrab:8009 route=liferaya BalancerMember ajp://lrbb:8009 route=liferayb status=+H ProxySet lbmethod=byrequests nofailover=on </Proxy> The conector in tomcat is now configured like this: <!-- Define an AJP 1.3 Connector on port 8009 --> <Connector port="8009" protocol="AJP/1.3" redirectPort="8443" URIEncoding="UTF-8" enableLookups="false" allowTrace="true" /> Do you think it could be useful to set a maxThreads parameter, like in this post?? in that case, How can i determine a proper number of threads? From time to time, we get errors like this [Tue Sep 18 17:57:02 2012] [error] ajp_read_header: ajp_ilink_receive failed [Tue Sep 18 17:57:02 2012] [error] (120006)APR does not understand this error code: proxy: read response failed from 192.168.1.104:8009 (lrab) And apache switches to the pasive node (if its active) or fails with 503. Some things i have tried so far: I think that i have some performance issues with one of the applications, Here you can see a threadDump But i'm not quite sure about it. I also started to monitor the network connection. I have noticed that there are some pings lost when i have a "ping -f " so maybe it could be a network issue, but the success rate is 100% (so the lost packets are only a few among the flood, but maybe, i don't know, enough to break the link betwen apache and tomcat). I wrote a python script to check connectivity with timestamps on the pings, so i can know when the network fails. After sniffing the network , i can also see some RST packets, but i don't know if that is a normal behaviour (some applications do that to end a network communication). I have also noticed that the applications have problems communicating with the database, but im not even sure if this could be related or not. If you think so, i can post more info about it. I changed the connector on the tomcats to use the native one, but still the same. I need not even a solution to this, but maybe some guidance on how can i troubleshoot this better ¿Analyze threads, monitor mysql performance, sniff the traffic between apaches and tomcats? Ultimately, all i need is to balance the tomcat instances in Active/pasive mode, so if there is another way to do it, i could give it a try.

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• Solution to route/proxy SNMP Traps (or Netflow, generic UDP, etc) for network monitoring?

  - by Christopher Cashell

  I'm implementing a network monitoring solution for a very large network (approximately 5000 network devices). We'd like to have all devices on our network send SNMP traps to a single box (technically this will probably be an HA pair of boxes) and then have that box pass the SNMP traps on to the real processing boxes. This will allow us to have multiple back-end boxes handling traps, and to distribute load among those back end boxes. One key feature that we need is the ability to forward the traps to a specific box depending on the source address of the trap. Any suggestions for the best way to handle this? Among the things we've considered are: Using snmptrapd to accept the traps, and have it pass them off to a custom written perl handler script to rewrite the trap and send it to the proper processing box Using some sort of load balancing software running on a Linux box to handle this (having some difficulty finding many load balancing programs that will handle UDP) Using a Load Balancing Appliance (F5, etc) Using IPTables on a Linux box to route the SNMP traps with NATing We've currently implemented and are testing the last solution, with a Linux box with IPTables configured to receive the traps, and then depending on the source address of the trap, rewrite it with a destination nat (DNAT) so the packet gets sent to the proper server. For example: # Range: 10.0.0.0/19 Site: abc01 Destination: foo01 iptables -t nat -A PREROUTING -p udp --dport 162 -s 10.0.0.0/19 -j DNAT --to-destination 10.1.2.3 # Range: 10.0.33.0/21 Site: abc01 Destination: foo01 iptables -t nat -A PREROUTING -p udp --dport 162 -s 10.0.33.0/21 -j DNAT --to-destination 10.1.2.3 # Range: 10.1.0.0/16 Site: xyz01 Destination: bar01 iptables -t nat -A PREROUTING -p udp --dport 162 -s 10.1.0.0/16 -j DNAT --to-destination 10.3.2.1 This should work with excellent efficiency for basic trap routing, but it leaves us completely limited to what we can mach and filter on with IPTables, so we're concerned about flexibility for the future. Another feature that we'd really like, but isn't quite a "must have" is the ability to duplicate or mirror the UDP packets. Being able to take one incoming trap and route it to multiple destinations would be very useful. Has anyone tried any of the possible solutions above for SNMP traps (or Netflow, general UDP, etc) load balancing? Or can anyone think of any other alternatives to solve this?

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• Are FC and SAS DAS devices standard enough?

  - by user222182

  Before I ask my questions, here is some background info that may or may not be useful: For the first time I find myself needing a DAS solution. My priority is data through-put in a single direction. I can write large blocks, and I don't need to read at the same time. The server (the data producing device) is not really a typical server, its a very powerful single board computer. As such I have limited options when it comes to the add-in cards I can install since it must use the fairly uncommon interface, XMC. Currently I believe I am limited PCIex8 gen 1 which means that the likely bottle neck for me will be this 16gbps connection. XMC Boards I have found so far offer the following connections: a) Dual 10GBE ethernet controller, total throughput 20gbps b) Dual Quad SAS 2.0 Connectors (SFF-8XXX) HBA (no raid), total throughput 48 gbps c) Dual FC 8gb HBA (no raid), total throughput 16gbps My questions for you guys are: 1) Are SAS and/or FC, and by extension their HBAs, standard enough that I could purchase a Dell or Aberdeen storage server with a raid controller that has external SAS or FC ports and expect that I can connect it to my SAS or FC HBA, be presented with a single volume (if I so configured the storage server), all without having to check for HBA compatibility? 2) On a device like a Dell PowerVault (either DAS or NAS) is there an OS on it to concern myself with, or is it meant to be remotely managed? Is there a local interface in case I cant remotely manage it (i.e. if my single board computer uses an OS not supported by Dell OpenManage). Would this be true of nearly any device which calls itself a DAS? 3) If I purchase some sort of Supermicro storage chassis, installed a raid controller with external connections, is there a nice lightweight OS I can run just for management of the controller? Would I even need an OS since the raid card would be configured pre-boot anyway? 4) It is much easier to buy XMC based 10gigabit ethernet cards (generally dual port). In what ways would I be getting into trouble by using iSCSI as a DAS are direct cabling with SFP+ cables? Thanks in advance

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• Complete Active Directory redesign and GPO application

  - by Wolfgang Kuehne

  after much testing and hundreds of tries and hours invested I decided to consult you experts here. Overview: I want to apply some GPO to our users which will add some specific site to the Trusted Sites in Internet Explorer settings for all users. However, the more I try the more confusing the results become. The GPO is either applied to one group of users, or to another one. Finally, I came to the conclusion that this weird behavior is cause rather by the poor organization in Users and Groups in Active Directory. As such I want to kick the problem from the root: Redesign the Active Directory Users and Groups. Scenario: There is one Domain Controller, and we use Terminal Services (so there is a Terminal Server as well). Users usually log on to the Terminal Server using Remote Desktop to perform their daily tasks. I would classify the users in the following way: IT: Admins, Software Development Business: Administration, Management The current structure of the Active Directory Users and Groups is a result of the previous IT management. The company has used Small Business Server which has created multiple default user groups and containers. Unfortunately, the guys working before me have do no documentation at all. Now, as I inherit this structure I am in the no mans land. No idea which direction to head first. As you can see, the Active Directory User and Groups have become a bit confusing. There is no SBS anymore, but when migrating from SBS to the current Windows Server 2008 R2 environment the guys before me have simply copied the same structure. The real question: Where should I start cleaning from, ensuring that I won't break totally the current infrastructure? What is a nice organization for the scenario that I have explained above? Possible useful info for the current structure: Computers folder contains Terminal Services Computers user group Members: TerminalServer computer located at Server -> Terminalserver OU Member of: NONE Foreign Security Principals : EMPTY Managed Service Accounts : EMPTY Microsoft Exchange Security Groups : not sure if needed, our emails are administered by external service provider Distribution Groups : not sure if needed Security Groups : there are couple of groups which are needed SBS users : contains all the users Terminalserver : contains only the TerminalServer machine

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• How Do I Properly Run OfflineIMAP in a Crontab

  - by alharaka

  Installed Fedora. # cat /etc/redhat_release | awk ' { print F "> " $0; print ""; }' Fedora release 14 (Laughlin) Installed offlineimap from yum, cuz I'm lazy these days. # yum info offlineimap | awk ' { print F "> " $0; print ""; }' Loaded plugins: langpacks, presto, refresh-packagekit Adding en_US to language list Installed Packages Name : offlineimap Arch : noarch Version : 6.2.0 Release : 2.fc14 Size : 611 k Repo : installed From repo : fedora Summary : Powerful IMAP/Maildir synchronization and reader support URL : http://software.complete.org/offlineimap/ License : GPLv2+ Description : OfflineIMAP is a tool to simplify your e-mail reading. With : OfflineIMAP, you can read the same mailbox from multiple : computers. You get a current copy of your messages on each : computer, and changes you make one place will be visible on all : other systems. For instance, you can delete a message on your home : computer, and it will appear deleted on your work computer as : well. OfflineIMAP is also useful if you want to use a mail reader : that does not have IMAP support, has poor IMAP support, or does : not provide disconnected operation. And, lo and behold, every time I run offlineimap and try to redirect output in a crontab, it does not work. Below is my .offlineimaprc. [general] ui = TTY.TTYUI accounts = Personal, Work maxsyncaccounts = 3 [Account Personal] localrepository = Local.Personal remoterepository = Remote.Personal [Account Work] localrepository = Local.Work remoterepository = Remote.Work [Repository Local.Personal] type = Maildir localfolders = ~/mail/gmail [Repository Local.Work] type = Maildir localfolders = ~/mail/companymail [Repository Remote.Personal] type = IMAP remotehost = imap.gmail.com remoteuser = [email protected] remotepass = password ssl = yes maxconnections = 4 # Otherwise "deleting" a message will just remove any labels and # retain the message in the All Mail folder. realdelete = no [Repository Remote.Work] type = IMAP remotehost = server.company.tld remoteuser = username remotepass = password ssl = yes maxconnections = 4 I have tried TTY.TTYUI, NonInteractive.Quiet and NonInteractive.Basic with different variations. With or without redirection, the crontab entries I try cause problems. $ crontab -l | awk ' { print F "> " $0; print ""; }' */5 * * * * offlineimap >> ~/mail/logs/offlineimap.log 2>&1 */5 * * * * offlineimap I always get the same damn error ERROR: No UIs were found usable!. What am I doing wrong!?

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• Why apcupsd won't see the UPS connected to the USB posrt on FreeBSD 8.0 amd64

  - by Max Kosyakov

  Hello, Recently I installed an apcusbd on a FreeBSD 8.0 amd64 box via ports system. It installed perfectly but it won't run. Here what is says in the log: FATAL ERROR in generic-usb.c at line 636 Cannot find UPS device It appeared that HID driver picked the /dev/ugen4.2 which could cause the apcusb being unable to find the device. After I had discovered this, I rebuilt the kernel and removed the hid driver. Now it just shows "ugen4.2: <Tripp Lite> at usbus4" and no uhid0 device appears. Nevertheless the problem persisted. I tried to leave the DEVICE config setting blank --- won't help. Then I specified the particular device in the config, but it did not help either. Below you is the output of several commands that can provide some useful information on my case. server# /usr/local/etc/rc.d/apcupsd start Starting apcupsd. server# tail /var/log/messages | grep apcupsd Jun 17 22:30:00 server apcupsd[1520]: apcupsd FATAL ERROR in generic-usb.c at line 636 Cannot find UPS device -- For a link to detailed USB trouble shooting information, please see . Jun 17 22:30:00 server apcupsd[1520]: apcupsd error shutdown completed server# cat /usr/local/etc/apcupsd/apcupsd.conf ## apcupsd.conf v1.1 ## UPSCABLE usb UPSTYPE usb DEVICE /dev/ugen4.2 LOCKFILE /var/lock UPSCLASS standalone UPSMODE disable server# dmesg | grep '^u' uhci0: port 0xa800-0xa81f irq 16 at device 26.0 on pci0 uhci0: [ITHREAD] uhci0: LegSup = 0x0f00 usbus0: on uhci0 uhci1: port 0xa880-0xa89f irq 21 at device 26.1 on pci0 uhci1: [ITHREAD] uhci1: LegSup = 0x0f00 usbus1: on uhci1 uhci2: port 0xac00-0xac1f irq 18 at device 26.2 on pci0 uhci2: [ITHREAD] uhci2: LegSup = 0x0f00 usbus2: on uhci2 usbus3: EHCI version 1.0 usbus3: on ehci0 uhci3: port 0xa080-0xa09f irq 23 at device 29.0 on pci0 uhci3: [ITHREAD] uhci3: LegSup = 0x0f00 usbus4: on uhci3 uhci4: port 0xa400-0xa41f irq 19 at device 29.1 on pci0 uhci4: [ITHREAD] uhci4: LegSup = 0x0f00 usbus5: on uhci4 uhci5: port 0xa480-0xa49f irq 18 at device 29.2 on pci0 uhci5: [ITHREAD] uhci5: LegSup = 0x0f00 usbus6: on uhci5 usbus7: EHCI version 1.0 usbus7: on ehci1 uart0: port 0x3f8-0x3ff irq 4 flags 0x10 on acpi0 uart0: [FILTER] usbus0: 12Mbps Full Speed USB v1.0 usbus1: 12Mbps Full Speed USB v1.0 usbus2: 12Mbps Full Speed USB v1.0 usbus3: 480Mbps High Speed USB v2.0 usbus4: 12Mbps Full Speed USB v1.0 usbus5: 12Mbps Full Speed USB v1.0 usbus6: 12Mbps Full Speed USB v1.0 usbus7: 480Mbps High Speed USB v2.0 ugen0.1: at usbus0 uhub0: on usbus0 ugen1.1: at usbus1 uhub1: on usbus1 ugen2.1: at usbus2 uhub2: on usbus2 ugen3.1: at usbus3 uhub3: on usbus3 ugen4.1: at usbus4 uhub4: on usbus4 ugen5.1: at usbus5 uhub5: on usbus5 ugen6.1: at usbus6 uhub6: on usbus6 ugen7.1: at usbus7 uhub7: on usbus7 uhub0: 2 ports with 2 removable, self powered uhub1: 2 ports with 2 removable, self powered uhub2: 2 ports with 2 removable, self powered uhub4: 2 ports with 2 removable, self powered uhub5: 2 ports with 2 removable, self powered uhub6: 2 ports with 2 removable, self powered uhub3: 6 ports with 6 removable, self powered uhub7: 6 ports with 6 removable, self powered ugen4.2: at usbus4 server#

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• Macintosh computers cannot connect to router unless we re-start the modem and router

  - by dwwilson66

  We have a small office network with DSL and a Netgear WNR-2000 wireless router acting as a DHCP server. There are nine devices connected to the router, wirelessly and wired. Whenever a Mac computer tries to connect, it's unsuccessful until we restart the router. Each of the possible devices that can connect to the network is listed in a table to assign certain IP addresses to certain MAC addresses. I am running WPA-PSK security. I can view the router status and see that the Mac's MAC address is visible to the router, but with a 169.* IP address, even though I'm assigning its MAC address to an IP address within my subnet. All non-Mac devices attached to the network connect properly, and can access the network properly even AFTER the Mac has not successfully connected. The network includes Windows devices, Roku boxes, printers and internet ready TVs. This to me, would point to a DHCP issue with how Mac communicates with my network. One interesting thing to note is that if a Mac connects and is prevented from sleeping, it will stay connected indefinitely; reissuing the security cert from the router works fine. I'm not sure if that's supposed to sever & re-establish a connection with the updated credentials or not, but I do stay connected. If the Mac sleeps and is awakened while the security cert is still valid, it connects fine. If the security certificate expires while the Mac is asleep, we need to restart the router. Restarting the router will ALWAYS assigns the proper IP addresses to the Mac equipment. I have heard anecdotally that Mac doesn't play well with 802.11n; I have not tested any other Wireless protocols. There's a couple issues here: First, I found this on Stack, Mac laptop crashing wireless router, but it's not rally applicable since the router isn't crashing. But, it does give some clues about Mac's accessing the network. I did change my encryption from WEP to WPA-PSK, but after about a week, we're still experiencing the issue. I'm not really sure if there's anything else useful in that question. Second, I'm considering getting a 802.11c router and hooking it up to the wireless N router. the 802.11c router would handle all the Mac traffic, and would be set up as a Mac-only subnet. Everything else would remain as is. However, I'm not sure if this is doable on a technology level...do I need a bridge or is this some way to do this with regular consumer gear?

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• Vagrant-aws not provisioning

  - by SuperCabbage

  I'm trying to spin up and provision an EC2 instance with Vagrant, it successfully creates the instance up and I can then use vagrant ssh to SSH into the it but Puppet doesn't seem to carry out any provisioning. Upon running vagrant up --provider=aws --provision I get the following output Bringing machine 'default' up with 'aws' provider... WARNING: Nokogiri was built against LibXML version 2.8.0, but has dynamically loaded 2.9.1 [default] Warning! The AWS provider doesn't support any of the Vagrant high-level network configurations (`config.vm.network`). They will be silently ignored. [default] Launching an instance with the following settings... [default] -- Type: m1.small [default] -- AMI: ami-a73264ce [default] -- Region: us-east-1 [default] -- Keypair: banderton [default] -- Block Device Mapping: [] [default] -- Terminate On Shutdown: false [default] Waiting for SSH to become available... [default] Machine is booted and ready for use! [default] Rsyncing folder: /Users/benanderton/development/projects/my-project/aws/ => /vagrant [default] Rsyncing folder: /Users/benanderton/development/projects/my-project/aws/manifests/ => /tmp/vagrant-puppet/manifests [default] Rsyncing folder: /Users/benanderton/development/projects/my-project/aws/modules/ => /tmp/vagrant-puppet/modules-0 [default] Running provisioner: puppet... An error occurred while executing multiple actions in parallel. Any errors that occurred are shown below. An error occurred while executing the action on the 'default' machine. Please handle this error then try again: No error message I can then SSH into the instance by using vagrant ssh but none of my provisioning has taken place, so I'm assuming that errors have occured but I'm not being given any useful information relating to them. My Vagrantfile is as following; Vagrant.configure("2") do |config| config.vm.box = "ubuntu_aws" config.vm.box_url = "https://github.com/mitchellh/vagrant-aws/raw/master/dummy.box" config.vm.provider :aws do |aws, override| aws.access_key_id = "REDACTED" aws.secret_access_key = "REDACTED" aws.keypair_name = "banderton" override.ssh.private_key_path = "~/.ssh/banderton.pem" override.ssh.username = "ubuntu" aws.ami = "ami-a73264ce" end config.vm.provision :puppet do |puppet| puppet.manifests_path = "manifests" puppet.module_path = "modules" puppet.options = ['--verbose'] end end My Puppet manifest is as following; package { [ 'build-essential', 'vim', 'curl', 'git-core', 'nano', 'freetds-bin' ]: ensure => 'installed', } None of the packages are installed.

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• Sent items listed by sender's name (my name!) not recipient in Outlook for Mac 2011

  - by user568458

  Outlook 2011 on a Mac (OSX7 Lion), on a (mostly PC) office network using Microsoft Exchange server. In Outlook 2011, in the network "Sent Items" folder, all emails are listed showing the sender's name (my name), not the recipients' names. That means every single email is headed with my own name, like this: My Name 08/09/2012 Some subject line [flag] My Name 08/09/2012 Re: Another subject line [flag] My Name 07/09/2012 Re: different subject line [flag] My Name 07/09/2012 different subject line [flag] ...and so on. There's no clue at all as to who these emails were to, until I open each and every one. I guess it's reassuring to be told that every email that I sent was sent by me... and if I was ever to forget my own name while browsing my sent emails folder, it'd be super useful... But it's not very helpful for navigating sent emails. Is this normal for Office for Mac 2011? How can I fix this, so that the list shows the recipients' names instead of endlessly reminding me of my own name? Things I've found while researching this: This can also happen in Outlook for Windows. On Windows, it's easily fixed by resetting the field. That method doesn't work on Mac because the fields can't be selected separately. It seems this can also happen in Apple Mail too, and a lot of people seem stumped by this. I can't find anything on this specific to Outlook 2011 or Outlook for Mac in general. A simple guide on how to fix this would be the best answer, but I'd also welcome any knowledgable thoughts from Microsoft Exchange Server people on whether this sounds like an Outlook settings issue which I can fix on my machine, or some issue relating to how the Mac gets data from the server and network. The fact that Apple Mail users have encountered the same issue with no apparent fix makes me think the problem might be in the network rather than the mail client - but that's way beyond my limited knowledge of these things. I don't know whether the local ("On my computer") Sent Items folder has the same problem, as it's configured so that no emails except drafts are ever stored in these local folders. Drafts saved locally are listed by recipient as expected.

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• Wake On Lan only works on first boot, not sequent ones

  - by sp3ctum

  I have converted my old Dell Latitude D410 laptop to a server for tinkering. It is running an updated Debian Squeeze (6) with a Xen enabled kernel (I want to toy with virtual machines later on). I am running it 'headless' via an ethernet connection. I am struggling to enable Wake On Lan for the box. I have enabled the setting in the BIOS, and it works nicely, but only for the first time after the power cord is plugged in. Here is my test: Plug in power cord, don't boot yet Send magic Wake On Lan packet from test machine (Ubuntu) using the wakeonlan program Server expected to start (does every time) Once server has booted, log in via ssh and shut it down via the operating system After shutdown, wake server up via WOL again (fails every time) Some observations: Right after step 1 I can see the integrated NIC has a light on. I deduce this means the NIC gets adequate power and that the ethernet cable is connected to my switch. This light is not on after step 4 (the shutdown stage). The light becomes back on after I disconnect and reconnect the power cord, after which WOL works as well. After step 4 I can verify that wake on lan is enabled via the ethtool program (repeatable each time) This blog post suggested the problem may lay in the fact the motherboard might not be giving adequate power to the NIC after shutdown, so I copied an acpitool script that supposedly should signal the system to give the needed power to the card when shut down. Obviously it did not fix my issue. I have included the relevant power settings in the paste below. I have tried different combinations of parameters of shutdown (the program) options, as well as the poweroff program. I even tried "telinit 0", which I figured would do the most direct boot via software. If I keep the laptop's power button pressed down and do a hard boot this way, the light on the ethernet port stays lit and a WOL is possible. I copied a bunch of hopefully useful information in this paste I have tried this with the laptop battery connected and without it. I get the same result. Promptly pressing the power button causes the system to shut down with the message "The system is going down for system halt NOW!", and WOL is still unsuccessful.

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• RSH between servers not working

  - by churnd

  I have two servers: one CentOS 5.8 & one Solaris 10. Both are joined to my workplace AD domain via PBIS-Open. A user will log into the linux server & run an application which issues commands over RSH to the solaris server. Some commands are also run on the linux server, so both are needed. Due to the application these servers are being used for (proprietary GE software), the software on the linux server needs to be able to issue rsh commands to the solaris server on behalf of the user (the user just runs a script & the rest is automatic). However, rsh is not working for the domain users. It does work for a local user, so I believe I have the necessary trust settings between the two servers correct. However, I can rlogin as a domain user from the linux server to the solaris server. SSH works too (how I wish I could use it). Some relevant info: via rlogin: [user@linux~]$ rlogin solaris connect to address 192.168.1.2 port 543: Connection refused Trying krb4 rlogin... connect to address 192.168.1.2 port 543: Connection refused trying normal rlogin (/usr/bin/rlogin) Sun Microsystems Inc. SunOS 5.10 Generic January 2005 solaris% via rsh: [user@linux ~]$ rsh solaris ls connect to address 192.168.1.2 port 544: Connection refused Trying krb4 rsh... connect to address 192.168.1.2 port 544: Connection refused trying normal rsh (/usr/bin/rsh) permission denied. [user@linux ~]$ relevant snippet from /etc/pam.conf on solaris: # # rlogin service (explicit because of pam_rhost_auth) # rlogin auth sufficient pam_rhosts_auth.so.1 rlogin auth requisite pam_lsass.so set_default_repository rlogin auth requisite pam_lsass.so smartcard_prompt try_first_pass rlogin auth requisite pam_authtok_get.so.1 try_first_pass rlogin auth sufficient pam_lsass.so try_first_pass rlogin auth required pam_dhkeys.so.1 rlogin auth required pam_unix_cred.so.1 rlogin auth required pam_unix_auth.so.1 # # Kerberized rlogin service # krlogin auth required pam_unix_cred.so.1 krlogin auth required pam_krb5.so.1 # # rsh service (explicit because of pam_rhost_auth, # and pam_unix_auth for meaningful pam_setcred) # rsh auth sufficient pam_rhosts_auth.so.1 rsh auth required pam_unix_cred.so.1 # # Kerberized rsh service # krsh auth required pam_unix_cred.so.1 krsh auth required pam_krb5.so.1 # I have not really seen anything useful in either system log that seem to be directly related to the failed login attempt. I've tail -f'd /var/adm/messages on solaris & /var/log/messages on linux during the failed attempts & nothing shows up. Maybe I need to be doing something else?

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• mounting ext4 fs with block size of 65536

  - by seaquest

  I am doing some benchmarking on EXT4 performance on Compact Flash media. I have created an ext4 fs with block size of 65536. however I can not mount it on ubuntu-10.10-netbook-i386. (it is already mounting ext4 fs with 4096 bytes of block sizes) According to my readings on ext4 it should allow such big block sized fs. I want to hear your comments. root@ubuntu:~# mkfs.ext4 -b 65536 /dev/sda3 Warning: blocksize 65536 not usable on most systems. mke2fs 1.41.12 (17-May-2010) mkfs.ext4: 65536-byte blocks too big for system (max 4096) Proceed anyway? (y,n) y Warning: 65536-byte blocks too big for system (max 4096), forced to continue Filesystem label= OS type: Linux Block size=65536 (log=6) Fragment size=65536 (log=6) Stride=0 blocks, Stripe width=0 blocks 19968 inodes, 19830 blocks 991 blocks (5.00%) reserved for the super user First data block=0 1 block group 65528 blocks per group, 65528 fragments per group 19968 inodes per group Writing inode tables: done Creating journal (1024 blocks): done Writing superblocks and filesystem accounting information: done This filesystem will be automatically checked every 37 mounts or 180 days, whichever comes first. Use tune2fs -c or -i to override. root@ubuntu:~# tune2fs -l /dev/sda3 tune2fs 1.41.12 (17-May-2010) Filesystem volume name: <none> Last mounted on: <not available> Filesystem UUID: 4cf3f507-e7b4-463c-be11-5b408097099b Filesystem magic number: 0xEF53 Filesystem revision #: 1 (dynamic) Filesystem features: has_journal ext_attr resize_inode dir_index filetype extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isize Filesystem flags: signed_directory_hash Default mount options: (none) Filesystem state: clean Errors behavior: Continue Filesystem OS type: Linux Inode count: 19968 Block count: 19830 Reserved block count: 991 Free blocks: 18720 Free inodes: 19957 First block: 0 Block size: 65536 Fragment size: 65536 Blocks per group: 65528 Fragments per group: 65528 Inodes per group: 19968 Inode blocks per group: 78 Flex block group size: 16 Filesystem created: Sat Feb 5 14:39:55 2011 Last mount time: n/a Last write time: Sat Feb 5 14:40:02 2011 Mount count: 0 Maximum mount count: 37 Last checked: Sat Feb 5 14:39:55 2011 Check interval: 15552000 (6 months) Next check after: Thu Aug 4 14:39:55 2011 Lifetime writes: 70 MB Reserved blocks uid: 0 (user root) Reserved blocks gid: 0 (group root) First inode: 11 Inode size: 256 Required extra isize: 28 Desired extra isize: 28 Journal inode: 8 Default directory hash: half_md4 Directory Hash Seed: afb5b570-9d47-4786-bad2-4aacb3b73516 Journal backup: inode blocks root@ubuntu:~# mount -t ext4 /dev/sda3 /mnt/ mount: wrong fs type, bad option, bad superblock on /dev/sda3, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so

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• Partition table corrupted (USB flash drive)

  - by 13ren

  It's an 8 GB Patriot thumb drive, which I've used extensively with lots of data. Today, it is detected, but all data is gone: (EDIT at least some data is still there, but the partition table is gone) EDIT @Sathya (thanks) here's the relevant output from sudo fdisk -l: Disk /dev/sdc: 8019 MB, 8019509248 bytes 247 heads, 62 sectors/track, 1022 cylinders Units = cylinders of 15314 * 512 = 7840768 bytes Disk /dev/sdc doesn't contain a valid partition table It looks like it is /dev/sdc, with that 8 GB... and no partition table. I tried to mount /dev/sdc (and then dmesg | tail): /media> sudo mount /dev/sdc mytmp mount: wrong fs type, bad option, bad superblock on /dev/sdc, missing codepage or other error In some cases useful info is found in syslog - try dmesg | tail or so /media> dmesg | tail [ 24.300000] sdc: unknown partition table [ 24.320000] sd 2:0:0:0: Attached scsi removable disk sdc [ 24.370000] usb-storage: device scan complete [ 26.870000] EXT2-fs error (device sdc): ext2_check_descriptors: Block bitmap for group 1 not in group (block 0)! [ 26.870000] EXT2-fs: group descriptors corrupted! [ 50.420000] unhashed dentry being revalidated: .DCOPserver_eeepc-brendanma__0 [ 50.430000] unhashed dentry being revalidated: .DCOPserver_eeepc-brendanma__0 [ 50.430000] unhashed dentry being revalidated: .DCOPserver_eeepc-brendanma__0 [ 5565.470000] EXT2-fs error (device sdc): ext2_check_descriptors: Block bitmap for group 1 not in group (block 0)! [ 5565.470000] EXT2-fs: group descriptors corrupted! EDIT @Col: results from testdisk Disk /dev/sdc - 8013 MB / 7642 MiB - CHS 1022 247 62 Current partition structure: Partition Start End Size in sectors Partition sector doesn't have the endmark 0xAA55 After I hit [proceed], it says: Structure: Ok. Keys A: add partition, L: load backup, Enter: to continue The "Structure: Ok." seems reassuring... will "A: add partition" make my old data accessible (if it's still there), or will it make a new, fresh partition? Another option is "[ MBR Code ] Write TestDisk MBR code to first sector" - would it be better to do this? EDIT I found that at least some of my data is still on the flash drive, by using the below, and searching for English text in less (like " the "): cat /dev/sde | tr -cd '\11\12\40\1540-\176' | less (The drive changed from "/dev/sdb" to "/dev/sde" because I connected some extra drives today). I've learnt that "/dev/sde1" would be the first partition; and "/dev/sde" is the whole drive. Because unix treats these devices just like files, you can use all the ordinary unix file commands on them, like cat, and then process them like any other stream of data. The tr above removes non-printable characters ("\40" is space, which I wanted to preserve). In less, you can use "/" to search, similar to Vim. How can I get my data back (assuming it's still there)? If only the partition table is corrupted, is there a standard "partition recovery tool"? Is there a way to "repartition" without deleting everything?

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• lacp, cicso 3550, 3560, help with configuration

  - by Flamewires

  Hey all this is a repost from a question I asked on the cisco forums but never got a useful reply. Hey I'm trying to convert the FreeBSD servers at work to dual-gig lagg links from regular gigabit links. Our production servers are on a 3560. I have a small test environment on a 3550. I have achieved fail-over, but am having troubles achieving the speed increase. All servers are running gig intel (em) cards. The configs for the servers are: BSDServer: #!/bin/sh #bring up both interfaces ifconfig em0 up media 1000baseTX mediaopt full-duplex ifconfig em1 up media 1000baseTX mediaopt full-duplex #create the lagg interface ifconfig lagg0 create #set lagg0's protocol to lacp, add both cards to the interface, #and assign it em1's ip/netmask ifconfig lagg0 laggproto lacp laggport em0 laggport em1 ***.***.***.*** netmask 255.255.255.0 The switches are configured as follows: #clear out old junk no int Po1 default int range GigabitEthernet 0/15 - 16 # config ports interface range GigabitEthernet 0/15 - 16 description lagg-test switchport duplex full speed 1000 switchport access vlan 192 spanning-tree portfast channel-group 1 mode active channel-protocol lacp **** switchport trunk encapsulation dot1q **** no shutdown exit interface Port-channel 1 description lagginterface switchport access vlan 192 exit port-channel load-balance src-mac end obviously change 1000's to 100's and GigabitEthernet to FastEthernet for the 3550's config, as that switch has 100Mbit speed ports. With this config on the 3550, I get failover and 92Mbits/sec speed on both links, simultaneously, connecting to 2 hosts.(tested with iperf) Success. However this is only with the "switchport trunk encapsulation dot1q" line. First, I do not understand why I need this, I thought it was only for connecting switches. Is there some other setting which this turns on that is actually responsible for the speed increase? Second, This config does not work on the 3560. I get failover, but not the speed increase. Speeds drop from gig/sec to 500Mbit/sec when I make 2 simultaneous connections to the server with or without the encapsulation line. I should mention that both switches are using source-mac load balancing. In my test I am using Iperf. I have the server(lagg box) setup as the server(iperf -s), and the client computers are client(iperf -c server-ip-address), so the source mac(and IP) are different for both connections. Any ideas/corrections/questions would be helpful, as the gig switches are what I actually need the lagg links on. Ask if you need more information.

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• kvm and qemu host: Is there a limit for max CPUs (Ubuntu 10.04)?

  - by Valentin

  Today we encountered a really strange behaviour on two identical kvm and qemu hosts. The host systems each have 4 x 10 Cores, which means that 40 physical cores are displayed as 80 within the operating system (Ubuntu Linux 10.04 64 Bit). We started a Windows 2003 32 Bit VM (1 CPU, 1 GB RAM, we changed those values multiple times) on one of the nodes and noticed that it took 15 minutes until the boot process began. During those 15 minutes, a black screen is shown and nothing happens. libvirt and the host system show that the qemu-kvm process for the guest is almost idling. stracing this process only shows some FUTEX entries, but nothing special. After those 15 minutes, the Windows VM suddenly starts booting and the Windows logo occurs. After a few seconds, the VM is ready to be used. The VM itself is very performant, so this is no performance issue. We tried to pin the CPUs with the virsh and taskset tools, but this only made things worse. When we boot the Windows VM with a Linux Live CD there is also a black screen for several minutes, but not as long as 15. When booting another VM on this host (Ubuntu 10.04) it also has the black screen problem, and also here the black screen is only shown for 2-3 minutes (instead of 15). So, summerinzing this: Each guest on each of those identical nodes suffers from idling a few minutes after being started. After a few minutes, the boot process suddenly starts. We have observed that the idling time happens right after the bios of the guest was initialized. One of our employees had the idea to limit the amount of CPUs with maxcpus=40 (because of 40 physical cores existing) within Grub (kernel parameter) and suddenly the "black-screen-idling"-behaviour disappeared. Searching the KVM and Qemu mailing lists, the internet, forums, serverfault and other various sites for known bugs etc. showed no useful results. Even asking in the dev IRC channels brought no new ideas. The people there recommend us to use CPU pinning, but as stated before it didn't help. My question is now: Is there a sort of limit of CPUs for a qemu or kvm host system? Browsing the source code of those two tools showed that KVM would send a warning if your host has more than 255 CPUs. But we are not even scratching on that limit. Some stuff about the host system: 3.0.0-20-server kvm 1:84+dfsg-0ubuntu16+0.14.0+noroms+0ubuntu4 kvm-pxe 5.4.4-7ubuntu2 qemu-kvm 0.14.0+noroms-0ubuntu4 qemu-common 0.14.0+noroms-0ubuntu4 libvirt 0.8.8-1ubuntu6 4 x Intel(R) Xeon(R) CPU E7-4870 @ 2.40GHz, 10 Cores

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• Windows DHCP Server - get notification when a non-AD joined device gets an IP address

  - by TheCleaner

  SCENARIO To simplify this down to it's easiest example: I have a Windows 2008 R2 standard DC with the DHCP server role. It hands out IPs via various IPv4 scopes, no problem there. WHAT I'D LIKE I would like a way to create a notification/eventlog entry/similar whenever a device gets a DHCP address lease and that device IS NOT a domain joined computer in Active Directory. It doesn't matter to me whether it is custom Powershell, etc. Bottom line = I'd like a way to know when non-domain devices are on the network without using 802.1X at the moment. I know this won't account for static IP devices. I do have monitoring software that will scan the network and find devices, but it isn't quite this granular in detail. RESEARCH DONE/OPTIONS CONSIDERED I don't see any such possibilities with the built in logging. Yes, I'm aware of 802.1X and have the ability to implement it long-term at this location but we are some time away from a project like that, and while that would solve network authentication issues, this is still helpful to me outside of 802.1X goals. I've looked around for some script bits, etc. that might prove useful but the things I'm finding lead me to believe that my google-fu is failing me at the moment. I believe the below logic is sound (assuming there isn't some existing solution): Device receives DHCP address Event log entry is recorded (event ID 10 in the DHCP audit log should work (since a new lease is what I'd be most interested in, not renewals): http://technet.microsoft.com/en-us/library/dd759178.aspx) At this point a script of some kind would probably have to take over for the remaining "STEPS" below. Somehow query this DHCP log for these event ID 10's (I would love push, but I'm guessing pull is the only recourse here) Parse the query for the name of the device being assigned the new lease Query AD for the device's name IF not found in AD, send a notification email If anyone has any ideas on how to properly do this, I'd really appreciate it. I'm not looking for a "gimme the codez" but would love to know if there are alternatives to the above list or if I'm not thinking clear and another method exists for gathering this information. If you have code snippets/PS commands you'd like to share to help accomplish this, all the better.

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• How do i enable innodb on ubuntu server 10.04

  - by Matt

  Here is my entire my.cnf [client] port = 3306 socket = /var/run/mysqld/mysqld.sock # Here is entries for some specific programs # The following values assume you have at least 32M ram # This was formally known as [safe_mysqld]. Both versions are currently parsed. [mysqld_safe] socket = /var/run/mysqld/mysqld.sock nice = 0 [mysqld] key_buffer = 224M sort_buffer_size = 4M read_buffer_size = 4M read_rnd_buffer_size = 4M myisam_sort_buffer_size = 12M query_cache_size = 44M # # * Basic Settings # # # * IMPORTANT # If you make changes to these settings and your system uses apparmor, you may # also need to also adjust /etc/apparmor.d/usr.sbin.mysqld. # user = mysql socket = /var/run/mysqld/mysqld.sock port = 3306 basedir = /usr datadir = /var/lib/mysql tmpdir = /tmp skip-external-locking # # Instead of skip-networking the default is now to listen only on # localhost which is more compatible and is not less secure. bind-address = 127.0.0.1 # # * Fine Tuning # #key_buffer = 16M max_allowed_packet = 16M thread_stack = 192K thread_cache_size = 8 # This replaces the startup script and checks MyISAM tables if needed # the first time they are touched myisam-recover = BACKUP #max_connections = 100 #table_cache = 64 #thread_concurrency = 10 # # * Query Cache Configuration # query_cache_limit = 1M #query_cache_size = 16M # # * Logging and Replication # # Both location gets rotated by the cronjob. # Be aware that this log type is a performance killer. # As of 5.1 you can enable the log at runtime! #general_log_file = /var/log/mysql/mysql.log #general_log = 1 log_error = /var/log/mysql/error.log # Here you can see queries with especially long duration #log_slow_queries = /var/log/mysql/mysql-slow.log #long_query_time = 2 #log-queries-not-using-indexes # # The following can be used as easy to replay backup logs or for replication. # note: if you are setting up a replication slave, see README.Debian about # other settings you may need to change. #server-id = 1 #log_bin = /var/log/mysql/mysql-bin.log expire_logs_days = 10 max_binlog_size = 100M #binlog_do_db = include_database_name #binlog_ignore_db = include_database_name # # * InnoDB # # InnoDB is enabled by default with a 10MB datafile in /var/lib/mysql/. # Read the manual for more InnoDB related options. There are many! # # * Security Features # # Read the manual, too, if you want chroot! # chroot = /var/lib/mysql/ # # For generating SSL certificates I recommend the OpenSSL GUI "tinyca". # # ssl-ca=/etc/mysql/cacert.pem # ssl-cert=/etc/mysql/server-cert.pem # ssl-key=/etc/mysql/server-key.pem [mysqldump] quick quote-names max_allowed_packet = 16M [mysql] #no-auto-rehash # faster start of mysql but no tab completition [isamchk] key_buffer = 16M # # * IMPORTANT: Additional settings that can override those from this file! # The files must end with '.cnf', otherwise they'll be ignored. # !includedir /etc/mysql/conf.d/ And here is my show engines call....i have no idea what i need to do to enable innodb show engines; +------------+---------+----------------------------------------------------------------+--------------+------+------------+ | Engine | Support | Comment | Transactions | XA | Savepoints | +------------+---------+----------------------------------------------------------------+--------------+------+------------+ | MyISAM | DEFAULT | Default engine as of MySQL 3.23 with great performance | NO | NO | NO | | MRG_MYISAM | YES | Collection of identical MyISAM tables | NO | NO | NO | | BLACKHOLE | YES | /dev/null storage engine (anything you write to it disappears) | NO | NO | NO | | CSV | YES | CSV storage engine | NO | NO | NO | | MEMORY | YES | Hash based, stored in memory, useful for temporary tables | NO | NO | NO | | FEDERATED | NO | Federated MySQL storage engine | NULL | NULL | NULL | | ARCHIVE | YES | Archive storage engine | NO | NO | NO | +------------+---------+----------------------------------------------------------------+--------------+------+------------+ 7 rows in set (0.00 sec)

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• Jenkins: Accessed denied after turning on global security. How to revert?

  - by serverFaulter

  Need help figuring this one out. How can I fix this issue? I think I enabled global security and saw this error immediately. (while accessing localhost:8080 I get the following...) A problem occurred while processing the request. Please check our bug tracker to see if a similar problem has already been reported. If it is already reported, please vote and put a comment on it to let us gauge the impact of the problem. If you think this is a new issue, please file a new issue. When you file an issue, make sure to add the entire stack trace, along with the version of Jenkins and relevant plugins. The users list might be also useful in understanding what has happened. Stack trace hudson.security.AccessDeniedException2: anonymous is missing the Overall/Read permission at hudson.security.ACL.checkPermission(ACL.java:54) at hudson.model.Node.checkPermission(Node.java:418) at jenkins.model.Jenkins.getTarget(Jenkins.java:3658) at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:656) at org.kohsuke.stapler.Stapler.invoke(Stapler.java:858) at org.kohsuke.stapler.Stapler.invoke(Stapler.java:631) at org.kohsuke.stapler.Stapler.service(Stapler.java:225) at javax.servlet.http.HttpServlet.service(HttpServlet.java:848) at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:686) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1494) at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:96) at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:88) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482) at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:48) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482) at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:84) at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76) at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:164) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482) at org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:46) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482) at hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:81) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1474) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:499) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137) at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:533) at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231) at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086) at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:428) at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116) at org.eclipse.jetty.server.Server.handle(Server.java:370) at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:489) at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:949) at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:1011) at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:644) at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235) at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82) at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:668) at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52) at winstone.BoundedExecutorService$1.run(BoundedExecutorService.java:77) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918) at java.lang.Thread.run(Thread.java:695)

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• serving mp3s to mobile devices is flooding nginx with partial requests

  - by drumfire

  I am serving mp3s with a minimalistic nginx server. What I see in my log files is that there are a lot of requests, in particular from AppleCoreMedia and sometimes Android useragents, that flood the server with short requests. Sometimes they keep requesting to download the same partial content for a very long time; sometimes more than an hour. For example: "GET /somefile.mp3 HTTP/1.1" 206 33041 "AppleCoreMedia/1.0.0.9B206 (iPhone; U; CPU OS 5_1_1 like Mac OS X; en_us)" "GET /somefile.mp3 HTTP/1.1" 206 33041 "AppleCoreMedia/1.0.0.9B206 (iPhone; U; CPU OS 5_1_1 like Mac OS X; en_us)" "GET /somefile.mp3 HTTP/1.1" 206 33041 "AppleCoreMedia/1.0.0.9B206 (iPhone; U; CPU OS 5_1_1 like Mac OS X; en_us)" [...] I also get a lot, but not as much, of these: "-" 400 0 "-" "-" 400 0 "-" The IP addresses are always from clients that start downloading shortly after that request, usually they have roughly the same UserAgent as in the first example. emphasized text I have enabled server throttling and connection limits in nginx to limit the huge amount of log entries from equivalent IPs at least somewhat. There was a performance issue when I saw the same behaviour on the previous server that used Apache. I installed nginx on a better server then moved the site. When Apache could not handle more connections from the increasing number of clients effectively that server was ddossed. There was no bandwidth issue with already connected clients and I don't know if the already connected clients were using more than one connection at a time. Please tell me: Are clients that appear to get stuck on a download a Bad Thing™ I heard people say their mobile bandwidth use was much higher than they could account for. I'm thinking this type of client behaviour can account for that. And costs us more bandwidth too. Which up to date alternatives exist out there that can handle serving this type of data better than plain HTTP? Useful general insights for someone who just came into this field straight out of the late 90s. :-)

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• High load on X3220 Quad Core Linux Apache server

  - by John Templar

  I'm seriously in need of help. My sites are now nearly impossible to use because of massive loads on my server. I'm already a month late on my mortgage and this really isn't helping my situation. I've been working on fixing this intermittent load problem for months (never this bad). I'm suspecting some kind of attack since I'm under DDOS attack a lot! I've been trying to figure out what is causing the load but I'm afraid I just don't have the experience or knowledge to understand all the data I've been looking at. I don't even know where to begin or how to test for the large array of attacks out there. Here's some data you might find useful... Server: Xeon X3220 Quad Core 2.4 GHz - Linux, FreeBSD 500 GB HD and 8 Gig of Ram. Runs Centos release 5.7 Server Version: Apache/2.2.21 (Unix) mod_ssl/2.2.21 OpenSSL/0.9.8e-fips-rhel5 mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/5.0.2.2635 mod_qos/9.74 Warning: All sites are softcore adult sites - mostly fantasy art like elves and amazons. 1) Sites may run fine for weeks or just days at less than 10 load then start jumping to 40-80 load - no idea why. Same sites, same mods, same amount of traffic - just WHAM! 2) I get an email almost every day that says: "Large Number of Failed Login Attempts from IP (different each time)". My webhost (who almost never helps me) told me it was a udp flood or something. 3) I've changed the port for MySQL from the default. If I ever put it back to the default - I get Loads of over 100 from what must be a constant mysql port flood. 4) I've reconfigured MYSQL. Link: http://www.deadlyamazons.com/logs/mycnf.txt 5) I have 3 Joomla Jomsocial networks. I've spent a couple weeks turning all the mods/plugins off, waiting a day and then turning them back on the next day or later if there isn't any change (there hasn't been). For example, on Thursday I'll turn off videos, on Friday I'll turn off chat.. etc and nothing changes the load appreciably. 6) Joomla info: All SEF turned off - sh404sef completely disabled and removed. Components: Joomla 1.5.22, Jomsocial 2.0.5, Kunena 1/31/2011, HWDMediashare 11/22/2010 and JBolo Chat 2.7.3, Comet Chat or Envolve Chat. Page Compression is on, Cache is on 15 mins. Please click on this forum to see links to all my reports: http://forum.joomla.org/viewtopic.php?f=433&t=706035&p=2777500#p2777500 Any help would be highly appreciated.

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• How to get an inactive RAID device working again?

  - by Jonik

  After booting, my RAID1 device (/dev/md_d0 *) sometimes goes in some funny state and I cannot mount it. * Originally I created /dev/md0 but it has somehow changed itself into /dev/md_d0. # mount /opt mount: wrong fs type, bad option, bad superblock on /dev/md_d0, missing codepage or helper program, or other error (could this be the IDE device where you in fact use ide-scsi so that sr0 or sda or so is needed?) In some cases useful info is found in syslog - try dmesg | tail or so The RAID device appears to be inactive somehow: # cat /proc/mdstat Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md_d0 : inactive sda4[0](S) 241095104 blocks # mdadm --detail /dev/md_d0 mdadm: md device /dev/md_d0 does not appear to be active. Question is, how to make the device active again (using mdmadm, I presume)? (Other times it's alright (active) after boot, and I can mount it manually without problems. But it still won't mount automatically even though I have it in /etc/fstab: /dev/md_d0 /opt ext4 defaults 0 0 So a bonus question: what should I do to make the RAID device automatically mount at /opt at boot time?) This is an Ubuntu 9.10 workstation. Background info about my RAID setup in this question. Edit: My /etc/mdadm/mdadm.conf looks like this. I've never touched this file, at least by hand. # by default, scan all partitions (/proc/partitions) for MD superblocks. # alternatively, specify devices to scan, using wildcards if desired. DEVICE partitions # auto-create devices with Debian standard permissions CREATE owner=root group=disk mode=0660 auto=yes # automatically tag new arrays as belonging to the local system HOMEHOST <system> # instruct the monitoring daemon where to send mail alerts MAILADDR <my mail address> # definitions of existing MD arrays # This file was auto-generated on Wed, 27 Jan 2010 17:14:36 +0200 In /proc/partitions the last entry is md_d0 at least now, after reboot, when the device happens to be active again. (I'm not sure if it would be the same when it's inactive.) Resolution: as Jimmy Hedman suggested, I took the output of mdadm --examine --scan: ARRAY /dev/md0 level=raid1 num-devices=2 UUID=de8fbd92[...] and added it in /etc/mdadm/mdadm.conf, which seems to have fixed the main problem. After changing /etc/fstab to use /dev/md0 again (instead of /dev/md_d0), the RAID device also gets automatically mounted!

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• What part of SMF is likely broken by a hard power down?

  - by David Mackintosh

  At one of my customer sites, the local guy shut down their local Solaris 10 x86 server, pulled the power inputs, moved it, and now it won’t start properly. It boots and then presents a prompt which lets you log in. This appears to be single user milestone (or equivalent). Digging into it, I think that SMF isn’t permitting the system to go multi-user. SMF was generating a ton of errors on autofs, after some fooling with it I got it to generate errors on inetd and nfs/client instead. This all tells me that the problem is in some SMF state file or database that needs to be fixed/deleted/recreated or something, but I don’t know what the actual issue is. By “generate errors”, I mean that every second I get a message on the console saying “Method or service exit timed out. Killing contract <#.” This makes interacting with the computer difficult. Running svcs –xv shows the service as “enabled”, in state “disabled”, reason “Start method is running”. Fooling with svcadm on the service does nothing, except confirm that the service is not in a Maintenance state. Logs in /lib/svc/log/$SERVICE just tell you that this loop has been happening once per second. Logs in /etc/svc/volatile/$SERVICE confirm that at boot the service is attempted to start, and immediately stopped, no further entries. Note that system-log isn’t starting because system-log depends on autofs so I have no syslog or dmesg. Googling all these terms ends up telling me how to debug/fix either autofs or nfs/client or inetd or rpc/gss (which was the dependency that SMF was using as an excuse to prevent nfs/client from “starting”, it was claiming that rpc/gss was “undefined” which is incorrect since this all used to work. I re-enabled it with inetadm, but inetd still won’t start properly). But I think that the problem is SMF in general, not the individual services. Doing a restore_repository to the “manifest_import” does nothing to improve, or even detectibly change, the situation. I didn’t use a boot backup because the last boot(s) were not useful. I have told the customer that since the valuable data directories are on a separate file system (which fsck’s as clean so it is intact) we could just re-install solaris 10 on the / partition. But that seems like an awfully windows-like solution to inflict on this problem. So. Any ideas what piece is broken and how I might fix it?

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