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• IPTables reroute traffic not working

  - by user1307079

  I am trying to reroute incoming traffic on my server's port 80 to another server, but it is not working. This is what I tried. On the host server, I ran these: echo “1? > /proc/sys/net/ipv4/ip_forward iptables -t nat -A PREROUTING -p tcp --dport 80 -j DNAT --to-destination 38.105.20.226:80 iptables -t nat -A POSTROUTING -j MASQUERADE The server I want it to redirect to is 38.105.20.226:80, but when I go to the webserver that is on the main server, instead of showing the content of the web server on 38.105.20.226:80, it just doesn't load. I am on CentOS.

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• How do i restart my linux server in every 2 days via crontab?

  - by Barkat Ullah

  I have a Linux server containing the os version below: Linux 2.6.32-220.7.1.el6.x86_64 I want to restart it in every 2 days, please help me, I want to do it via crontab. Another help, I used a code below to drop my memory caches in every hour. 0 * * * * /root/clearcache.sh #!/bin/sh sync; echo 3 > /proc/sys/vm/drop_caches But 1st 15 in every hour my server remain so slow after cleaning the caches. My sites do not load during every hour in 1st 15 minutes. In another way if I restart my server then also caches are removed. So I decided to restart my server in every 2 days to drop my caches. Will it be helpful to restart? Or is there any other way to drop my memory caches that will not down my server?

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• Why does my computer show a black screen when booting into Windows Vista?

  - by dassouki

  Today, I removed some old software from dad's vista, and installed SP1. After which the computer restarted and it went into a "black" screen. I left it running for a few hours, and the laptop was really hot. I tried to get into safemode, start from last known good start up, but nothing seemed to work. i know it stops after loading \windows\system32\drivers\cplir.sys what's going on and how can I fix his computer? Update I'm still unable to fix my install. Repair and restoring the OS fail. The laptop has the vista partition built into it. I can't boot through a USB, and my other computer doesn't have a cd/dvd writer Update 2 I tried chkdisk /f and although it fixed some errors, I still get the black screen of death.

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• Can installing URL Rewrite 2.0 on production IIS 7.5 have a negative impact?

  - by Olaf

  We have a Windows 2008 R2 server with IIS 7.5 and a lot of customer websites. Being no sys-admin but a developer, I hate to touch that wonderfully running system. However, I'd like to update the IIS plugin URL Rewrite to version 2.0 via Web Platform Installer. I do not want to do anything that might compromise the server, hence the question: can I expect it to work with at least a 99% chance? I did not find any bug reports or reviews on the web, so I'd like to hear an expert on that.

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• Where can I find ready to use windows scripts that used robocopy?

  - by Geo

  We are installing the Windows Resource Kit, and that installs RoboCopy. We want to have access to a few windows scripts that uses RoboCopy so we can start from those to build something else. Any ideas on where I can find a few samples? NOTE 1: A bit of information. Every time we try to copy D drive to E drive (new drive) we get an error that says: ERROR 32 (0x000000020) Copying File d:\pagefile.sys The process cannot access the file because it is being used by another process. Waiting 30 seconds. Just to help figure it out.

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• BSOD when playing Portal 2 using ATI Radeon 4800 on H61M/U3S3 mobo

  - by Ben Walker

  playing Portal 2 will always give me blue screen of death, usually after about 10 minutes of playing. BSOD references atikmpag.sys. I have tried several updates for graphics driver and through ATI Catalyst Center. I have updated the motherboard BIOS. My RAM is OK. Nothing changes. I had previously run the game fine, then I removed my video card to use on-board graphics once, and after re-installing the video card, I get this problem every time. I am using: ATI Radeon 4800 ASRockH61M/U3S3 motherboard Windows 7 64-bit

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• How to tell if linux disk IO is causing excessive (> 1 second) application stalls

  - by noahz

  I have a Java application performing a large volume (hundreds of MB) of continuous output (streaming plain text) to about a dozen files a ext3 SAN filesystem. Occasionally, this application pauses for several seconds at a time. I suspect that something related to ext3 vsfs (Veritas Filesystem) functionality (and/or how it interacts with the OS) is the culprit. What steps can I take to confirm or refute this theory? I am aware of iostat and /proc/diskstats as starting points. Revised title to de-emphasize journaling and emphasize "stalls" I have done some googling and found at least one article that seems to describe behavior like I am observing: Solving the ext3 latency problem Additional Information Red Hat Enterprise Linux Server release 5.3 (Tikanga) Kernel: 2.6.18-194.32.1.el5 Primary application disk is fiber-channel SAN: lspci | grep -i fibre 14:00.0 Fibre Channel: Emulex Corporation Saturn-X: LightPulse Fibre Channel Host Adapter (rev 03) Mount info: type vxfs (rw,tmplog,largefiles,mincache=tmpcache,ioerror=mwdisable) 0 0 cat /sys/block/VxVM123456/queue/scheduler noop anticipatory [deadline] cfq

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• set tap0 using virt-manager for bridged wireless

  - by DaveO

  After 3 days I finally have kvm guests working on the network via wireless (link below - thanks!): My network is 192.168.1.0/24 on the host: sudo sh -c "echo 1 > /proc/sys/net/ipv4/ip_forward" sudo tunctl -t tap0 sudo ip link set tap0 up sudo ip addr add 192.168.1.25/24 dev tap0 sudo route add -host 192.168.1.30 dev tap0 sudo parprouted wlan0 tap0 on the guest: auto eth0 iface eth0 inet static address 192.168.1.30 netmask 255.255.255.0 network 192.168.1.0 broadcast 192.168.1.255 gateway 192.168.1.25 and start the guest: sudo kvm /path/to/guest.img -net nic,macaddr=DE:AD:BE:EF:90:26 -net tap,ifname=tap0,script=no This works great and I can ping the local network and the internet back and forth between the guest. But how do I add these settings to the guest's xml config so I can start the guest via virt-manager with the same nic settings? ref: http://www.linuxquestions.org/questions/debian-26/kvm-wireless-bridge-network-691953/

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• Removing a malware that sets up as a system driver

  - by ereOn

  Hello, I recently tried to fix up my mother's computer which has some serious malwares. One of them apparently registered itself as system driver (tjbijkoq.sys if that can help) and after running a malware suppression tool, the computer won't boot anymore, complaining about a "critical driver that is missing". I think deleting the matching entry in the registry would just solve the problem, but obviously I can't boot up the computer (even in safe mode) to fix it. Do you guys have any experience with such an issue and how to solve this ? Thank you very much. The operating system is Windows Vista 32 bits Professional

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• Windows 8 Unable to perform hibernate

  - by Jones

  Windows 8 Enterprise edition x86. Already enabled hibernate option, to have it on shutdown menu (start menu?) and set to hibernate on lid closing. However it's not hibernating for me. When I'm trying to sleep, it's sleep fine and wake up like a kid. But when I'm demanding hibernate, it disconnects internet, turn off screen and be back to lock screen in one second. Steps I've tried. Complete shutdown Clear hiberfile.sys by disabling and enabling back Resetting my power settings. Causes I suspect: Had dual boot with BackTrack with Windows 8 GUI boot manager. It was fine until I reinstall BackTrack, bootmgr resetted and I'm in Ubuntu boot menu;. Using additional hard disk through USB cable.(But it's not a problem before few days, however) How to make my system to hibernate and wakeup again.

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• Does splitting out Data, Logs, and TempDB matter using a SAN with SQL 2008

  - by MVCylon

  I'm not a server admin. So be gentle. But I was just at a conference and in one of the training classes the Instructor explained some SQL DBA best practices. One of which was to separate out Mdf,Ldf, and TempDB onto different drives to increase performance. Now at our office we have a san. The Sys Admins created 3 san drives one for data, one for Logs, and one for TempDB. My intuition tells me that was a wasted effort...was it? I don't know alot of the details, but if you ask i'll try to fill in any specs needed to answer this question accurately.

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• Is it possible to make Ctrl+C as responsive as Ctrl+Break in the Windows 7 console?

  - by Peter Graham

  Is it possible to make Ctrl+C act like Ctrl+Break in the Windows 7 cmd.exe console? By default Ctrl+C seems to only send a signal the next time the input buffer is read, where Ctrl+Break sends a signal immediately. This makes Ctrl+C useless for ending processes because when I want to end a process I want to end it immediately. I'm using Ctrl+Break for now but it's far harder to type. It looks like in DOS you can add BREAK=ON to CONFIG.SYS to achieve this, but not in Windows 7?

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• What are the best possible ways to benchmark RAM (no-ECC) under linux / arm?

  - by moul

  I want to test integrity and global performances of no-ECC memory chips on a custom board Are there some tools that run under linux so I can monitor system and global temperature in the same time ? Are there some no-ECC specific tests to do in general ? EDIT 1: I already know how to monitor temperature (I use a special platform feature /sys/devices/platform/......../temp1_input). For now : wazoox : it works but I've to code my own tests Jason Huntley : ramspeed : does not work on arm stream benchmark : it works and is very fast, so I'll look if it's accurate and complete memtest : I'll try later, since it does not run directly from linux stress for fedora : I'll try later too, it's too problematic for me to install fedora now I found this distribution : http://www.stresslinux.org/sl/ I'll continue to check tools that run directly under linux without too big dependencies, after I'll maybe give a try to solutions like stresslinux, memtest, stress for fedora. Thanks for you answers, I'll continue to investigate

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• Corrupt mysql system tables

  - by psynnott

  I am having issues with the columns_priv table in the mysql system database. I cannot add new users currently. I have tried repairing it using mysqlcheck --auto-repair --all-databases --password but I get the following output: mysql.columns_priv Error : Incorrect file format 'columns_priv' error : Corrupt Is there any other way to repair this table, or how do I go about replacing it with a blank table? What would I lose by doing that? Thank you Edit (Additional Info) mysqld is currently using 100% cpu constantly. Looking at show processlist, I get: mysql> show processlist; +-----+------------------+-----------+-------+---------+------+-------------------+------------------------------------------------------------------------------------------------------+ | Id | User | Host | db | Command | Time | State | Info | +-----+------------------+-----------+-------+---------+------+-------------------+------------------------------------------------------------------------------------------------------+ | 5 | debian-sys-maint | localhost | mysql | Query | 1589 | Opening tables | ALTER TABLE tables_priv MODIFY Column_priv set('Select','Insert','Update','References') COLL | | | 752 | root | localhost | NULL | Query | 0 | NULL | show processlist | +-----+------------------+-----------+-------+---------+------+-------------------+------------------------------------------------------------------------------------------------------+ 2 rows in set (0.00 sec)

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• Running out of LowMem with Ubuntu PAE Kernel and 32GB of RAM

  - by magneticMonster

  I'm running a Java data import process on a 32-bit Ubuntu 10 PAE kernel machine. After running the process for a while, the oom-killer zaps my Java process. After some Googling and digging through docs, it looks like the system is running out of LowMem. I started the process for the third time and am watching free -lm show me Low: 464 386 77 with the free value (77MB) slowly decreasing. Why am I running out of lowmem and how do I increase it? Some details: $ cat /proc/sys/vm/lowmem_reserve_ratio 256 256 32 $ free -lm total used free shared buffers cached Mem: 32086 24611 7475 0 0 24012 Low: 464 407 57 High: 31621 24204 7417 -/+ buffers/cache: 598 31487 Swap: 2047 0 2047

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• Caching DNS server (bind9.2) CPU usage is so so so high

  - by Gk.

  I have a caching-only dns server which get ~3k queries per second. Here is specs: Xeon dual-core 2,8GHz 4GB of RAM Centos 5x (kernel 2.6.18-164.15.1.el5PAE) bind 9.4.2 rndc status: recursive clients: 666/4900/5000 About 300 new queries (not in cache) per second. Bind always uses 100% on one core on single-thread config. After I recompiled it to multi-thread, it uses nearly 200% on two core :( No iowait, only sys and user. I searched around but didn't see any info about how bind use CPU. Why does it become bottleneck? One more thing, here is RAM usage: cat /proc/meminfo MemTotal: 4147876 kB MemFree: 1863972 kB Buffers: 143632 kB Cached: 372792 kB SwapCached: 0 kB Active: 1916804 kB Inactive: 276056 kB I've set max-cache-size to 0 to make sure bind can use as much RAM as it want, but it always stop at ~2GB. Since every second we got not cached queries so theoretically RAM must be exhausted but it wasn't. Do you have any idea? TIA, -Gk

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• Why do some software not get load balanced even when there are multiple cores?

  - by Nav

  While VTune Analyzer was running on a blade server with 8 cores, I observed the cpu useage percentage using mpstat -P ALL 1. mpstat showed me that VTune was taking up 100% of a single core, while all other cores were idle. Why does that happen? Shouldn't the OS (RHEL Server 5.2) automatically distribute load across cores? The same happened when I tried running MATLAB (even after enabling multithreading support in the MATLAB settings). p.s: I'm a developer. Not a sys admin. So felt it better to ask here rather than at serverfault.

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• Create new partition on ssd hard (remove hibernate)

  - by Aleks

  I bought Dell Vostro 3360 notebook with Windows 7 It has 128 GB SSD hard disk, it is already has 4 partitions: Dell partition, Recovery partition, OS partition, Hibernate partition. Here is screenshot (Russian language, but I made some marks): I want to split OS partition, because I need c:\ and d:\ . Reason is that I have a lot of difficulties with administration mode on c:. So I tried to split OS partition but I already have 4 partitions. Can I remove hibernate partition without consequences? I have Hibernate disabled in settings, but I have hiberfil.sys file on c:\ If I can remove it, how can I do this, I can't do this with standard GUI disk managment tool

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• Map specific keys in emacs - Ubuntu

  - by Josh

  On my Mac, I have remapped the capslock key to be another Ctrl, and the key to the right of control to be M (meta?). It was real easy, the capslock was in sys prefs, and the M key was a pref in terminal. I cannot figure out how to do it on my Ubuntu 10.10 computer though. There was no remap capslock that I could find under any of the three keyboard pref menu items, and there are no prefs under the terminal that I can find. Can someone advise? I want the windows key on the keyboard to be M, if that matters. tl;dr; Ubuntu 10.10: Map capslock as Ctrl and Windows key as Meta (emacs) Thanks! EDIT: Found Capslock under System - Prefs - Keyboard - Layouts - USA - Options - Ctrl Key Position - Make CapsLock an additional Ctrl

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• Windows 7 x64 Hard Freezing (again)

  - by Lanissum

  Awhile ago, my computer was randomly freezing a few minutes after booting, and I ended up replacing the CPU and mobo after testing the RAM and hard drive, I also couldn't find anything wrong with the video card. So after replacing the presumably faulty hardware, everything worked fine for about a month and a half. All of a sudden, My computer is randomly freezing a few minutes after loading up any intensive application (games, mostly). Most of the time it just freezes with the current frame until I hard reset, although once it printed a BSOD message stating that dxgmms1.sys was to blame. The only difference between these two episodes I can think of is that I can do word/internet/work without issue now, as opposed to the near uselessness my computer was rendered last time. For those of you who want to know, I tested my memory with memtest86 (for 64 bit machines). I can't figure out what could have started this latest round of issues, the event logger just states that a kernel-power event has occurred (like last time) but I think thats just a generic "this machine has rebooted after a sudden shutdown" message.

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• The cache is getting at full level so fast

  - by CompilingCyborg

  Please, the memory and the cache are getting to the full level quite quickly under my linux mint 9 - isadora system. I used Ubuntu and Debian before, and it was not causing this issue at all. At the current time i typing the following command frequently to empty the cache "echo 3 /proc/sys/vm/drop_caches". Please any way around this? or do you know what's going wrong? | I am only programming on this machine; no graphics, no games nothing. Thanks in advance for your help!

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• What does an ACPI BIOS configure during boot?

  - by RJSmith92

  When a PC boots with an ACPI BIOS, what does it exactly do? I understand that the point of ACPI is to allow the OS to control hardware resources and power management but before the OS is loaded does ACPI configure just the devices needed to boot and then let the OS configure the rest? If the OS wants to re-asign hardware resources does it store this information in the ACPI tables so that the next time the system is booted it assigns them how the OS wants? The ACPI driver asks the PCI bus driver (Pci.sys) to enumerate devices on it's bus once the OS is loaded, how are these devices configured whilst the PC is booting when it doesn't have other bus drivers? Any help with any of the above questions would be greatly appreciated. Thanks.

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• Has ec2 made self-hosting possible for 'amateur' sysadmins possible?

  - by Blankman

  I'm a developer, and it seems ec2 has made it possible for a amateur sysadmin like me to setup and maintain a fairly large set of servers. Now I don't mean to undermine real sys admins, as I know the value of them but what I am trying to get at is that someone like me can setup and maintain a cluster of servers (front end web servers, with some db servers) using tools like ec2 and capistrano with the help of google. Now this isn't something I would do as a long term thing, but as a startup, one-man operation, I think I can pull this off until business takes off and I can hire this important role out. With ec2, I get my firewall, so I basically open up port 80 on my public facing server, which will run haproxy and route requests to my cluster of servers. Ofcourse I am simplifying the setup, but just want a feel for what you guys think about my perception. My application is a web application, that will be runing Ruby on rails (passenger) and talking to mysql or postgresql.

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• Tools/Tips to reduce the files/directories in C: which is SSD on Windows 7.

  - by prosseek

  I bought a SSD to install it as C: drive on Windows 7. As the SSD size is relatively small, I need to come up with an idea to reduce the files/directories in C:. What I found is as follows. Run WinDirStat to check how the C: is used. Remove the hibernate file (if you don't use it) powercfg –h off http://helpdeskgeek.com/windows-7/windows-7-delete-hibernation-file-hiberfil-sys/ Symbolic link files and directories to different drive. I'm not sure if this is safe way to go, I asked another post to ask about it. mklink /d e:\windows\installer c:\windows\installer Install software to E: directory, not C: directory. Create E:\Program Files What other tools or tips do you have?

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• linux intrusion detection software

  - by Sam Hammamy

  I have an Ubuntu VPS that I use for practice and deploying prototypes as I am a python developer. I recently started teaching my self sys admin tasks, like installing OpenLDAP. I happened to turn off the ufw firewall for just a minute, and when I ran an netstat command, I saw a foreign ip connected to ssh that I traced to china. I'd like to know a few things: 1) Is there any good network intrusion detection software, such that if any IP that's outside a specific range connects to the VPN, I can be notified? -- I am thinking about scripting this, but I'm pretty sure there's something useful out there and I believe in the wisdom of crowds. 2) How did this person gain access to my server? Is it because my firewall was down? Or is it because they browsed my LDAP directory and from there figured out a way to connect (there was a clear text password in the tree but it wasn't one used by the server's sshd)?

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