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• my webserver with 16GB ram shows all RAM as used, but is it really, see the 'top'

  - by Alex

  I have some questions about my web server. Its a LAMP web server running centos 5.5 and php5, mysql5. The server gets hundreds (maybe thousand) of concurrent users during peak hours. I'm trying to optimize a little and understand "top". From what I can see: all 16GB of my ram have been used up? does that mean that my server needs more memory? My swap is only 2GB, should it be increased? usually during peak hours my server load average first number is about 2.5-3. What could I do to optimize the server so that the load average even during peak doesn't go above 1? In the past I was told a good working server should stay under 1 load, is this still true? Although even during load of 2.5-3, server pages and applications seem to load with pretty good speed. what should the memory size in php.ini be set to? top - 14:30:18 up 2 days, 12:41, 5 users, load average: 1.25, 1.74, 2.92 Tasks: 305 total, 2 running, 302 sleeping, 0 stopped, 1 zombie Cpu(s): 6.3%us, 0.9%sy, 0.0%ni, 92.5%id, 0.2%wa, 0.0%hi, 0.1%si, 0.0%st Mem: 16427200k total, 16111472k used, 315728k free, 3120316k buffers Swap: 2104496k total, 268k used, 2104228k free, 6216756k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 29080 apache 15 0 358m 36m 5192 S 20.2 0.2 2:08.40 httpd 29093 apache 18 0 357m 36m 5192 S 18.2 0.2 2:02.52 httpd 29079 apache 15 0 370m 49m 5832 S 10.0 0.3 2:32.14 httpd 1812 apache 15 0 370m 49m 5196 S 7.3 0.3 2:25.30 httpd 5204 apache 15 0 358m 36m 5168 S 5.3 0.2 0:59.28 httpd 29075 apache 15 0 370m 48m 5184 S 3.3 0.3 2:15.93 httpd 9712 apache 15 0 360m 38m 5180 S 3.0 0.2 0:54.81 httpd 29072 apache 16 0 358m 36m 5192 S 2.7 0.2 2:24.43 httpd 6310 apache 17 0 388m 67m 5180 S 2.3 0.4 0:58.85 httpd 8674 apache 15 0 343m 21m 4980 S 2.0 0.1 0:07.91 httpd 29085 apache 15 0 371m 49m 5224 S 2.0 0.3 2:16.86 httpd 29083 apache 15 0 370m 48m 5196 S 1.7 0.3 2:10.64 httpd 5575 apache 15 0 357m 36m 5228 S 1.3 0.2 0:53.78 httpd 29066 apache 15 0 379m 59m 5860 R 1.3 0.4 2:11.93 httpd 29078 apache 15 0 370m 48m 5188 S 1.3 0.3 2:14.52 httpd 29084 apache 15 0 370m 48m 5208 S 1.0 0.3 2:02.49 httpd 29089 apache 15 0 370m 48m 5188 S 1.0 0.3 2:27.61 httpd 29082 apache 15 0 390m 68m 5188 S 0.7 0.4 2:32.48 httpd 29984 apache 15 0 358m 36m 5228 S 0.7 0.2 2:08.32 httpd 3571 root 16 0 13400 1792 848 S 0.3 0.0 2:37.89 top 4419 mysql 15 0 668m 175m 7204 S 0.3 1.1 3:32.25 mysqld 28181 root 15 0 90460 3624 2680 S 0.3 0.0 0:17.60 sshd 29091 apache 15 0 390m 69m 5196 S 0.3 0.4 2:29.99 httpd 32476 root 15 0 12900 1320 848 R 0.3 0.0 0:06.46 top 1 root 15 0 10372 680 572 S 0.0 0.0 0:02.01 init 2 root RT -5 0 0 0 S 0.0 0.0 0:00.51 migration/0 3 root 34 19 0 0 0 S 0.0 0.0 0:00.07 ksoftirqd/0 4 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/0 5 root RT -5 0 0 0 S 0.0 0.0 0:00.12 migration/1 6 root 34 19 0 0 0 S 0.0 0.0 0:00.03 ksoftirqd/1 7 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/1 8 root RT -5 0 0 0 S 0.0 0.0 0:00.06 migration/2 9 root 34 19 0 0 0 S 0.0 0.0 0:00.03 ksoftirqd/2 10 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/2 11 root RT -5 0 0 0 S 0.0 0.0 0:00.06 migration/3 12 root 34 19 0 0 0 S 0.0 0.0 0:00.04 ksoftirqd/3 13 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/3 14 root RT -5 0 0 0 S 0.0 0.0 0:01.45 migration/4 15 root 34 19 0 0 0 S 0.0 0.0 0:00.01 ksoftirqd/4 16 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/4 17 root RT -5 0 0 0 S 0.0 0.0 0:00.22 migration/5 18 root 34 19 0 0 0 S 0.0 0.0 0:00.01 ksoftirqd/5 19 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/5 20 root RT -5 0 0 0 S 0.0 0.0 0:00.15 migration/6 21 root 34 19 0 0 0 S 0.0 0.0 0:00.02 ksoftirqd/6 22 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/6 23 root RT -5 0 0 0 S 0.0 0.0 0:00.15 migration/7 24 root 34 19 0 0 0 S 0.0 0.0 0:00.01 ksoftirqd/7 25 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/7 26 root RT -5 0 0 0 S 0.0 0.0 0:00.19 migration/8 27 root 34 19 0 0 0 S 0.0 0.0 0:00.04 ksoftirqd/8 28 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/8 29 root RT -5 0 0 0 S 0.0 0.0 0:00.34 migration/9 30 root 34 19 0 0 0 S 0.0 0.0 0:00.03 ksoftirqd/9 31 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/9 32 root RT -5 0 0 0 S 0.0 0.0 0:00.16 migration/10 33 root 34 19 0 0 0 S 0.0 0.0 0:00.04 ksoftirqd/10 34 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/10 35 root RT -5 0 0 0 S 0.0 0.0 0:00.12 migration/11 36 root 34 19 0 0 0 S 0.0 0.0 0:00.05 ksoftirqd/11 37 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/11 38 root RT -5 0 0 0 S 0.0 0.0 0:00.35 migration/12

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• Swap drive not operating correctly

  - by Blue Ice

  At first, I started seeing the warning signs. The halting pages. The molasses speed of the windows closing. The pictures not rendering. Then, I took action. Recently I added a swap drive to my computer. For a while, everything was good. Unicorns frolicked among the new bits and bytes resplendent on the shiny metal platter known as my swap drive. Today, I opened Chromium, and got on the 7th tab (start.csail.mit.edu) "He's dead, Jim!". This used to happen before I added my swap drive, but now I thought that it wouldn't happen because I added more memory. I fear for the safety of the unicorns. Please help me make my swap drive work again. As a side note, here is the result of cat /proc/swaps: Filename Type Size Used Priority /dev/sda5 partition 39075836 213896 -1 Result of free: total used free shared buffers cached Mem: 507472 330792 176680 0 6208 71252 -/+ buffers/cache: 253332 254140 Result of df -h: Filesystem Size Used Avail Use% Mounted on /dev/sdb1 147G 8.9G 130G 7% / none 4.0K 0 4.0K 0% /sys/fs/cgroup udev 240M 12K 240M 1% /dev tmpfs 50M 824K 49M 2% /run none 5.0M 0 5.0M 0% /run/lock none 248M 208K 248M 1% /run/shm none 100M 20K 100M 1% /run/user

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• How do I fix a garbled screen on a Gateway LT3103u?

  - by paracaudex

  I've been having garbled screen problems on a Gateway LT3103u on Ubuntu for a while. I just did a fresh install of Ubuntu 11.10 and continue to have issues. I installed xubuntu-desktop in case the issues had to do with the sophisticated GNOME graphics. The problem is less bad, but it's still there. After a few minutes of using XFCE, the screen gets garbled. I assume this has something to do with the graphics card, but I don't know how to go about troubleshooting something like this. Where should I start? Update: Here is the description of the VGA card from lspci -vvv: 01:05.0 VGA compatible controller: ATI Technologies Inc RS690M [Radeon X1200 Series] (prog-if 00 [VGA controller]) Subsystem: Acer Incorporated [ALI] Device 028c Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast TAbort- SERR- [disabled] Capabilities: [50] Power Management version 2 Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-) Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME- Capabilities: [80] MSI: Enable- Count=1/1 Maskable- 64bit+ Address: 0000000000000000 Data: 0000 Kernel driver in use: radeon Kernel modules: radeon Update: Setting GRUB_CMDLINE_LINUX="nomodeset" in /etc/default/grub seems to have fixed it in both Ubuntu and xubuntu-desktop. I will test it for a day or so to see if the problems recur and then post more detail with some links to an explanation. Update 2: It is possible to use this fix for Nvidia card (GTX 260) when graphics is defective after 11.10 upgrade/install? First few restarts was graphic ok, then after few restarts begins suddenly be defective and it stay so. I must returned to 11.04 because this problem and I wait for 12.04. So I hope in this fix.

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• Ubuntu won't suspend anymore, but it did upon install.

  - by Bruce Connor

  I fresh installed Ubuntu 10.10 back when it came out, and my laptop was suspending fine. All of a sudden, I can't get my laptop to suspend anymore. It's an HP Pavilion dv2-1110, but I don't think it's a hardware issue, here's why: It suspended fine upon first install. I haven't installed any new kernels since then, but I have installed tons of packages, so it's probably a package. The suspend and hibernate options disappeared from the shutdown menu. If I press my keyboard's suspend button (or if I close the lid) I get the following message: If I try the command pmi action suspend, I get the error message: Error org.freedesktop.DBus.Error.ServiceUnknown: The name org.freedesktop.Hal was not provided by any .service files. If I try the command echo -n mem > sudo /sys/power/state I get absolutely no output and no visible effect. What might be causing this behavior? I thought a list of installed packages might be useful, but it's huge and I don't know how to post it here in collapse/expand mode or something. EDIT:Just in case someone asks, none of the installed packages are kdm or anything like that (which would justify the lack of options in gnome's shutdown menu).

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• Creating a vm using Hyper-V causes the host of BSOD

  - by Arcass

  Hi, Problem description: When I try to create a virtual machine, the host bsod part way through the process. From the logs in lookes to fail/hang on the "Creating new VirtualDisckDriver with new VHD" step. The BSOD error code is SYSTEM_SERVICE_EXCEPTION : STOP:0x0000003B When the machine has finished restarting, it looks to have created the vhd and XML files for the vm but it isn't accessable. I have two server bothing behaving in exactly the same way, so I don't believe it's a hardware fault. Has anyone had a similar experince? How did you resolve the problem? NOTES Hardware: HP DL380 G6 BIOS : 2010.03.30 (14 Apr 2010) [Latest from HP website] Inter Hyperthreading: Disabled Intel Virtuazation Technology : Enabled No-Execute Memory Protection: Enabled Mem check reports no errors OS: Windows 2008 Sp2 x64bit fully updated regards Arcass

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• Removed Java replaced with newest "Sun Java", disc won't boot, and won't let me re-install grub using boot repair disc

  - by Al Rowe

  Had a minor problem with my Stock market platform. Set-up screen would freeze program. Called their tech support, got their "Linux guy", who advised remove all Java and replace, not with synaptic version, but newest Sun Java. After removing, computer auto rebooted, and went to blue mem-test screen. Showed no errors, but couldn't get back in. Tried two versions of boot repair disc from iso (checked md5sum, showed good.), but fix aborted, giving apt-error detected. Opened a terminal and typed (or copy/paste): sudo chroot "/mnt/boot-sav/sda1" apt-get -f install. My system is Ubuntu 12.04. Had a few very minor issues from install, all fixed. Also added some of my favorite gnome tricks just to make life easier, but none that could have caused this. Added script to add shortcuts to desktop, open terminal in any menu from inside it, access root terminal, etc. System was firewalled and using avast antivirus (o.k., I'm paranoid. Used to do Windows sys-op and security.) But relative newbie to Linux.

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• Clear / Flush cached memory

  - by TheDave

  I have a small VPS with 6GB RAM hosting a couple of websites. Recently I have noticed that my cached memory size is quite high - see below: Cpu(s): 0.1%us, 0.1%sy, 0.0%ni, 99.1%id, 0.0%wa, 0.2%hi, 0.4%si, 0.0%st Mem: 6113256k total, 5949620k used, 163636k free, 398584k buffers Swap: 1048564k total, 104k used, 1048460k free, 3586468k cached After investigating if there is some method to have this flushed or cleared I stumbled upon a command which is: sync; echo 3 > /proc/sys/vm/drop_caches I read it could be useful to add this to a chron-task/job. Is this method recommended or could this lead to potential problems? The only concern I have is that I use one Magento installation on Memcached - could this have any negative effects on it? I am certainly not a pro therefore I would very much appreciate some expert advise. PS: My VPS runs on CentOS 5 x64 and I have WHM + NGINX installed.

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• Why is my mdadm raid-1 recovery so slow?

  - by dimmer

  On a system I'm running Ubuntu 10.04. My raid-1 restore started out fast but quickly became ridiculously slow (at this rate the restore will take 150 days!): dimmer@paimon:~$ cat /proc/mdstat Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md0 : active raid1 sdc1[2] sdb1[1] 1953513408 blocks [2/1] [_U] [====>................] recovery = 24.4% (477497344/1953513408) finish=217368.0min speed=113K/sec unused devices: <none> Eventhough I have set the kernel variables to reasonably quick values: dimmer@paimon:~$ cat /proc/sys/dev/raid/speed_limit_min 1000000 dimmer@paimon:~$ cat /proc/sys/dev/raid/speed_limit_max 100000000 I am using 2 2.0TB Western Digital Hard Disks, WDC WD20EARS-00M and WDC WD20EARS-00J. I believe they have been partitioned such that their sectors are aligned. dimmer@paimon:/sys$ sudo parted /dev/sdb GNU Parted 2.2 Using /dev/sdb Welcome to GNU Parted! Type 'help' to view a list of commands. (parted) p Model: ATA WDC WD20EARS-00M (scsi) Disk /dev/sdb: 2000GB Sector size (logical/physical): 512B/512B Partition Table: gpt Number Start End Size File system Name Flags 1 1049kB 2000GB 2000GB ext4 (parted) unit s (parted) p Number Start End Size File system Name Flags 1 2048s 3907028991s 3907026944s ext4 (parted) q dimmer@paimon:/sys$ sudo parted /dev/sdc GNU Parted 2.2 Using /dev/sdc Welcome to GNU Parted! Type 'help' to view a list of commands. (parted) p Model: ATA WDC WD20EARS-00J (scsi) Disk /dev/sdc: 2000GB Sector size (logical/physical): 512B/4096B Partition Table: gpt Number Start End Size File system Name Flags 1 1049kB 2000GB 2000GB ext4 I am beginning to think that I have a hardware problem, otherwise I can't imagine why the mdadm restore should be so slow. I have done a benchmark on /dev/sdc using Ubuntu's disk utility GUI app, and the results looked normal so I know that sdc has the capability to write faster than this. I also had the same problem on a similar WD drive that I RMAd because of bad sectors. I suppose it's possible they sent me a replacement with bad sectors too, although there are no SMART values showing them yet. Any ideas? Thanks. As requested, output of top sorted by cpu usage (notice there is ~0 cpu usage). iowait is also zero which seems strange: top - 11:35:13 up 2 days, 9:40, 3 users, load average: 2.87, 2.58, 2.30 Tasks: 142 total, 1 running, 141 sleeping, 0 stopped, 0 zombie Cpu(s): 0.0%us, 0.2%sy, 0.0%ni, 99.8%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 3096304k total, 1482164k used, 1614140k free, 617672k buffers Swap: 1526132k total, 0k used, 1526132k free, 535416k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 45 root 20 0 0 0 0 S 0 0.0 2:17.02 scsi_eh_0 1 root 20 0 2808 1752 1204 S 0 0.1 0:00.46 init 2 root 20 0 0 0 0 S 0 0.0 0:00.00 kthreadd 3 root RT 0 0 0 0 S 0 0.0 0:00.02 migration/0 4 root 20 0 0 0 0 S 0 0.0 0:00.17 ksoftirqd/0 5 root RT 0 0 0 0 S 0 0.0 0:00.00 watchdog/0 6 root RT 0 0 0 0 S 0 0.0 0:00.02 migration/1 ... dmesg errors, definitely looking like hardware: [202884.000157] ata5.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen [202884.007015] ata5.00: failed command: FLUSH CACHE EXT [202884.013728] ata5.00: cmd ea/00:00:00:00:00/00:00:00:00:00/a0 tag 0 [202884.013730] res 40/00:00:ff:59:2e/00:00:35:00:00/e0 Emask 0x4 (timeout) [202884.033667] ata5.00: status: { DRDY } [202884.040329] ata5: hard resetting link [202889.400050] ata5: link is slow to respond, please be patient (ready=0) [202894.048087] ata5: COMRESET failed (errno=-16) [202894.054663] ata5: hard resetting link [202899.412049] ata5: link is slow to respond, please be patient (ready=0) [202904.060107] ata5: COMRESET failed (errno=-16) [202904.066646] ata5: hard resetting link [202905.840056] ata5: SATA link up 3.0 Gbps (SStatus 123 SControl 300) [202905.849178] ata5.00: configured for UDMA/133 [202905.849188] ata5: EH complete [203899.000292] ata5.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen [203899.007096] ata5.00: failed command: IDENTIFY DEVICE [203899.013841] ata5.00: cmd ec/00:01:00:00:00/00:00:00:00:00/00 tag 0 pio 512 in [203899.013843] res 40/00:00:ff:f9:f6/00:00:38:00:00/e0 Emask 0x4 (timeout) [203899.041232] ata5.00: status: { DRDY } [203899.048133] ata5: hard resetting link [203899.816134] ata5: SATA link up 3.0 Gbps (SStatus 123 SControl 300) [203899.826062] ata5.00: configured for UDMA/133 [203899.826079] ata5: EH complete [204375.000200] ata5.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen [204375.007421] ata5.00: failed command: IDENTIFY DEVICE [204375.014799] ata5.00: cmd ec/00:01:00:00:00/00:00:00:00:00/00 tag 0 pio 512 in [204375.014800] res 40/00:00:ff:0c:0f/00:00:39:00:00/e0 Emask 0x4 (timeout) [204375.044374] ata5.00: status: { DRDY } [204375.051842] ata5: hard resetting link [204380.408049] ata5: link is slow to respond, please be patient (ready=0) [204384.440076] ata5: SATA link up 3.0 Gbps (SStatus 123 SControl 300) [204384.449938] ata5.00: configured for UDMA/133 [204384.449955] ata5: EH complete [204395.988135] ata5.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen [204395.988140] ata5.00: failed command: IDENTIFY DEVICE [204395.988147] ata5.00: cmd ec/00:01:00:00:00/00:00:00:00:00/00 tag 0 pio 512 in [204395.988149] res 40/00:00:ff:0c:0f/00:00:39:00:00/e0 Emask 0x4 (timeout) [204395.988151] ata5.00: status: { DRDY } [204395.988156] ata5: hard resetting link [204399.320075] ata5: SATA link up 3.0 Gbps (SStatus 123 SControl 300) [204399.330487] ata5.00: configured for UDMA/133 [204399.330503] ata5: EH complete

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• Memory is free, but still swapping?

  - by japancheese

  Hello, I'm sure this is a pretty basic question, but I'm just trying to get a grasp of what's going on with my Ubuntu (Hardy Herron) server (running a Rails-based site). It seems that I have free memory available, yet the system is reporting that it is still swapping memory (unless I'm reading this incorrectly?). Here is the "free -m" output total used free shared buffers cached Mem: 1024 905 118 0 33 409 -/+ buffers/cache: 462 561 Swap: 2047 95 1952 Could anyone explain to me some possible reasons that it is maintaining 95mb of swap at all times (it is never less)? I'm just looking for some leads on things I could check out that would explain to me exactly how memory is utilized in Linux.

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• cpu use goes to 100% when I lock the screen

  - by gianni

  Whenever I lock the screen, after a certain amount of time, the cpu and the cpu fan use go up near the limit, and it returns back to normal the moment I unlock the screen again (as shown by psensor). How can I find out what process is responsible for this? I've tried with "top -S", and the result is this... PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 2114 me 20 0 326m 104m 40m R 16 2.6 66:50.03 compiz 1234 root 20 0 396m 152m 98m R 6 3.8 20:23.88 Xorg 2204 me 20 0 160m 38m 30m S 4 1.0 0:33.35 yakuake 2446 me 20 0 206m 18m 12m S 4 0.5 6:32.18 psensor 2280 me 20 0 220m 18m 10m S 2 0.5 5:01.60 unity-panel 9138 me 20 0 154m 27m 15m S 2 0.7 0:03.63 plugin-cont 2282 me 20 0 65800 5272 3316 S 1 0.1 4:36.90 hud-service 2143 me 20 0 140m 11m 8352 S 1 0.3 2:50.16 indicator-m 9095 me 20 0 720m 253m 36m S 1 6.4 0:26.34 firefox 2076 me 20 0 7168 3484 828 S 1 0.1 1:46.53 dbus-daemon 2307 me 20 0 55000 5132 3632 S 1 0.1 2:01.55 indicator-a 2557 me 20 0 86328 6028 4576 S 0 0.1 1:44.71 conky 6290 me 20 0 2836 1296 964 R 0 0.0 0:29.64 top 6291 me 20 0 2836 1188 884 S 0 0.0 0:29.49 top 1 root 20 0 3644 1984 1284 S 0 0.0 60:57.76 init specs: ubuntu 12.04 fresh install intel core i5 4gB ram

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• XCP vm created via xl create doesn't show up in Xencenter neither in xe vm-list

  - by user138664

  i am running XCP 1.4.90.530.170661 and i have many PV guests running and created via XenCenter. I have created now an openwrt PV guest via the xl create command but it doesn't show up in Xencenter neither in the vm-list command: xe vm-list uuid ( RO) : 6d29aac1-67ff-f83e-4dbc-894a3b6b9c10 name-label ( RW): slitaz power-state ( RO): running uuid ( RO) : 07d96dd1-8223-cd1c-587d-ae37e48d267b name-label ( RW): xen-centos6 power-state ( RO): running uuid ( RO) : 3164bcf1-e43c-badb-e0cf-5423751fffb9 name-label ( RW): xenwin7 power-state ( RO): running uuid ( RO) : 8a31725e-4bcb-48ac-ba7b-e7c1ba310789 name-label ( RW): Control domain on host: xen-mini power-state ( RO): running xl list Name ID Mem VCPUs State Time(s) Domain-0 0 300 2 r----- 4862.5 xenwin7 2 766 1 -b---- 4933.1 slitaz 10 255 1 -b---- 30.8 xen-centos6 11 767 1 -b---- 46.9 openwrt 12 32 1 -b---- 6.8 are these two different kinds of PV vm? if yes, is there a way to export the "xl create" one as xva/ova and import it to show up like the others? Thanks in advance, /c/

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• Cryptswap boot error - can't mount?

  - by woody

  I believe i have my swap set up but am not sure because on start up it says that it is something along the lines of "could not mount /dev/mapper/cryptswap1 M for manual S for skip". But it appears to be mounted? I have already tried this solution with no success. When i run free -m the output is: total used free shared buffers cached Mem: 3887 769 3117 0 54 348 -/+ buffers/cache: 366 3520 Swap: 4026 0 4026 and sudo bklid is: /dev/sda1: UUID="9fb3ccd6-3732-4989-bfa4-e943a09f1153" TYPE="ext4" /dev/mapper/cryptswap1: UUID="bd9fe154-8621-48b3-95d2-ae5c91f373fd" TYPE="swap" and cat /etc/crypttab is: cryptswap1 /dev/sda5 /dev/urandom swap,cipher=aes-cbc-essiv:sha256 my /etc/fstab is: # /etc/fstab: static file system information. # # Use 'blkid' to print the universally unique identifier for a # device; this may be used with UUID= as a more robust way to name devices # that works even if disks are added and removed. See fstab(5). # # proc /proc proc nodev,noexec,nosuid 0 0 # / was on /dev/sda1 during installation UUID=9fb3ccd6-3732-4989-bfa4-e943a09f1153 / ext4 errors=remount-ro 0 1 # swap was on /dev/sda5 during installation #UUID=bb0e378e-8742-435a-beda-ae7788a7c1b0 none swap sw 0 0 /dev/mapper/cryptswap1 none swap sw 0 0 cat /proc/swaps output is: Filename Type Size Used Priority /dev/dm-0 partition 4123644 0 -1 Is my swap not setup correctly or how can i fix my boot message?

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• httpd service keep restarting. after 15-20 mins

  - by niraj

  I have recently purchased Dedicated Server which has 16bg ram and 1TB Harddisk. It has Cpanel and for firewall CSF Installd. I am mainly going to install it for File hosting service. Now the day i moved my httpd service keep restarting every 15-20 mins. It becomes unresponsive after that so have to manually restart it. My httpd settings are Start Servers = 5 Minimum Spare Servers = 5 Maximum Spare Servers = 10 Server Limit = 20000 Max Clients = 10000 Max Requests Per Child = 10000 Keep-Alive = On Keep-Alive Timeout = 5 Max Keep-Alive Requests = Unlimited Timeout 300 TOP is top - 14:53:41 up 1 day, 23:39, 2 users, load average: 0.10, 0.14, 0.09 Tasks: 1563 total, 1 running, 1562 sleeping, 0 stopped, 0 zombie Cpu(s): 0.7%us, 0.6%sy, 0.0%ni, 98.1%id, 0.2%wa, 0.0%hi, 0.5%si, 0.0%st Mem: 16303780k total, 16142048k used, 161732k free, 135264k buffers Swap: 8224760k total, 868k used, 8223892k free, 14136616k cached Please help me in this its keep happning.

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• Oh snap! My RPi was upgraded to 512MB! Woo-hoo!

  - by hinkmond

  I ordered a Raspberry Pi Model B (256MB) over 4 months ago on backorder. When it finally came I saw it was upgraded to the new half a gig model! Woot! But, all was not perfect. Gary C. told me the shipped configuration of the new RPi models didn't have the right firmware for 512MB, and I had to upgrade the start.elf in the /boot directory to recognize all of the 512MB RAM. I did a "free" command, and sure enough saw only 240MB. Sadness. But, Gary gave me a copy of his start.elf which worked after some trail and error. For anyone ordering the new RPi Model B w/512MB, here are the steps to get you going with full 512MB RAM: sudo apt-get update --fix-missing sudo apt-get upgrade --fix-missing # NOTE: This step takes at least a couple hours on a # fast network wget https://raw.github.com/raspberrypi/firmware/\ 164b0fe2b3b56081c7510df93bc1440aebe45f7e/boot/\ arm496_start.elf sudo mv /boot/start.elf /boot/orig-start.elf sudo mv arm496_start.elf /boot/start.elf sudo reboot free total used free shared buffers cached Mem: 497768 210596 287172 0 16892 169624 -/+ buffers/cache: 24080 473688 Swap: 102396 0 102396 So of course this means... (drumroll) there is now 498MB available for the Java Embedded heap! java -Xmx400m -version java version "1.7.0_06" Java(TM) SE Embedded Runtime Environment (build 1.7.0_06-b24, headless) Java HotSpot(TM) Embedded Client VM (build 23.2-b09, mixed mode) Yeah, baby! Hinkmond

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• linux migration/N high cpu consumption

  - by Alexander

  on my linux appliance based on 3.0.0-14 kernel I got: RPN:/tmp# ps axuf | grep migration root 6 92.9 0.0 0 0 ? S Apr23 2788:33 \_ [migration/0] root 7 99.7 0.0 0 0 ? S Apr23 2993:20 \_ [migration/1] my top is RPN:/tmp# top -b -n1 top - 12:03:41 up 2 days, 2:18, 5 users, load average: 25.76, 25.26, 24.73 Tasks: 171 total, 1 running, 168 sleeping, 0 stopped, 2 zombie Cpu(s): 14.0%us, 12.6%sy, 0.8%ni, 72.0%id, 0.3%wa, 0.0%hi, 0.3%si, 0.0%st Mem: 1543032k total, 1264728k used, 278304k free, 25308k buffers Swap: 0k total, 0k used, 0k free, 183168k cached My question: why processes "migration/N" take so much CPU?

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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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• Ubuntu 10.04 hung on unattended apt-get upgrade?

  - by hafichuk

  I'm looking into why our ubuntu web server hung this morning and see that there was some package upgrades a few hours prior to the problem. I was able to ssh into the system and get a snapshot from top: top - 08:13:54 up 210 days, 8:25, 2 users, load average: 433.30, 422.40, 375.70 Tasks: 1192 total, 381 running, 810 sleeping, 0 stopped, 1 zombie Cpu(s): 0.5%us, 6.1%sy, 0.0%ni, 93.4%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 49549772k total, 48518392k used, 1031380k free, 960152k buffers Swap: 11595768k total, 279368k used, 11316400k free, 39355664k cached This is a 16 processor system, so I would typically expect a load in the low teens. I tried to restart apache, which didn't work, and subsequently had to do a hard reboot to get it working again (which it is). One thing I found was that the server did an unattended package update. Is it possible that upgrading php or curl (which our web sites use) might have caused apache to stop responding? Here is the snip from the unattended-upgrades.log from this morning: 2012-09-18 06:48:30,076 INFO Initial blacklisted packages: 2012-09-18 06:48:30,076 INFO Starting unattended upgrades script 2012-09-18 06:48:30,077 INFO Allowed origins are: ["['Ubuntu', 'lucid-security']"] 2012-09-18 06:49:37,017 INFO Packages that are upgraded: gnupg-curl php5-dev linux-server dhcp3-common linux-libc-dev php5-curl gpgv gnupg linux-headers-server linux-image-server php5 php5-mysql php-pear php5-cli php5-common libapache2-mod-php5 dhcp3-client 2012-09-18 06:49:37,018 INFO Writing dpkg log to '/var/log/unattended-upgrades/unattended-upgrades-dpkg_2012-09-18_06:49:37.017909.log'

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• How do I throttle a command in a terminal window?

  - by To Do

  I needed to run convert with a lot of images at the same time. The command took quite a while but this doesn't bother me. The issue is that this command rendered my computer unusable while the command was running (for about 15 minutes). So is it possible to throttle the command by limiting resources (processor and memory) to the command, directly from the command line? This can only work if I add something to the same line before pressing Enter because once I start the process the computer slows so much that it is impossible for example to switch to "System monitor" and reduce priority. Edit: top and iotop results I managed to run top and sudo iotop >iotop.txt while doing one of these convert operations. (The iotop.txt file produced is difficult to read) Results of top: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 14275 username 20 0 4043m 3.0g 1448 D 7.0 80.4 0:16.45 convert Results of iotop: [?1049h[1;24r(B[m[4l[?7h[?1h=[39;49m[?25l[39;49m(B[m[H[2JTotal DISK READ: 1269.04 K/s | Total DISK WRITE:[59G0.00 B/s (B[0;7m TID PRIO USER DISK READ DISK WRITE SWAPIN(B[0;1;7m IO(B[0;7m COMMAND [3;2H(B[m2516 be/4 username 350.08 K/s 0.00 B/s 0.00 % 0.00 % zeitgeist-datahub 7394 be/4 username 568.88 K/s 0.00 B/s 77.41 % 0.00 % --rendere~.530483991[5;1H14275 idle username 350.08 K/s 0.00 B/s 37.49 % 0.00 % convert S~f test.pdf[6;2H2048 be/4 root[6;24H0.00 B/s 0.00 B/s 0.00 % 0.00 % [kworker/3:2] [5G1 be/4 root[7;24H0.00 B/s 0.00 B/s 0.00 % 0.00 % init Furthermore, even after the process ends, the computer does not return to the previous performance. I found a way around this by running sudo swapoff -a followed by sudo swapon -a

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• Compilation of Etherpad fails in an OpenVZ VE

  - by ulf

  Hi everyone. I’m almost giving up, this will be my last try: I try to compile Etherpad on my OpenVZ server. It’s running a Debian 5.0 as the host system, in the VE I’ve got Ubuntu 10.04. I installed Etherpad in this VE with the instructions from the official Ubuntu Wiki: https://wiki.ubuntu.com/Etherpad. Everything runs fine until it comes to compilation. After calling bin/build.sh as described in the wiki the first steps are running fine. But then I’m running into a memory error: java.io.IOException: Cannot run program "cp": java.io.IOException: error=12, Cannot allocate memory Well, I understand the error message but don’t see the cause. The command free tells me that there’s plenty memory left in this VE: total used free shared buffers cached Mem: 2415236 1140872 1274364 0 0 0 -/+ buffers/cache: 1140872 1274364 Swap: 0 0 0 Beautiful. But even repeating the compilation process doesn’t bring me any further. Any help would be appreciated.

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• Windows Server 2003 guest on Xen frequently stops responding

  - by smokris

  I'm running a Windows Server 2003 guest instance in Xen 3.x. This DomU runs fine for a day or two, then stops responding — I don't get any network response, and I can no longer connect to Xen's VNC console for this DomU. xm list shows this: Name ID Mem VCPUs State Time(s) Domain-0 0 6508 8 r----- 1161159.4 [A working Linux DomU] 1 512 1 -b---- 68711.1 [The hung Windows DomU] 5 512 1 ------ 67234.2 [Another working Linux DomU] 3 512 1 -b---- 163036.4 (What does the ------ mean? The xm manual explains what each of the six states mean, but not what no-state means.) If I xm destroy and then xm create the Windows DomU again, it boots right back up (with the Windows alert The previous system shutdown at [...] was unexpected.), and then stops responding after another day or two. I checked /var/log/xen/*.log, but no log messages are generated at the time the server stops responding. How should I proceed in troubleshooting this?

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• Why do I get disk I/O errors booting the 3.2 kernel on a xen vps server?

  - by Doug

  I have a xen vps, which I just upgraded to the new LTS 12 Precise Pangolin. However, I see this error on booting: [ 12.848076] end_request: I/O error, dev xvda, sector 12841 [ 12.848093] end_request: I/O error, dev xvda, sector 12841 [ 12.848103] Buffer I/O error on device xvda1, logical block 1605 [ 12.848110] lost page write due to I/O error on xvda1 [ 12.848129] Aborting journal on device xvda1. Results in / being mounted read-only. Reboot: [ 3.087257] EXT3-fs (xvda1): warning: ext3_clear_journal_err: Marking fs in need of filesystem check. [ 3.087677] EXT3-fs (xvda1): recovery complete [ 3.088514] EXT3-fs (xvda1): mounted filesystem with ordered data mode Begin: Running /scripts/local-bottom ... done. done. Begin: Running /scripts/init-bottom ... done. fsck from util-linux 2.20.1 PRGMRDISK1 contains a file system with errors, check forced. Checking disk drives for errors. This may take several minutes. Press C to cancel all checks in progress PRGMRDISK1: ***** REBOOT LINUX ***** PRGMRDISK1: 371152/6001184 files (2.8% non-contiguous), 4727949/12000000 blocks mountall: fsck / [308] terminated with status 3 mountall: System must be rebooted: / [ 151.566949] Restarting system. Name ID Mem VCPUs State Time(s) shadowmint 236 2048 1 --p--- 0.0 Reboot - back to 1. This is definitely an issue with the 3.2 kernel, because booting the 3.0.0 or 2.6.38 kernel series make this issue magically disappear. I'm certain this is some kind of weird xen thing, but no idea. Anyone? Anyhow, until this is resolve I strongly recommend against upgrading if you're running a xen server.

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• Apache conf for high trafic CMS with backend users?

  - by Annan

  I'm in the situation where a website is going to have a high number of web users and a few backend webmasters. Webmasters will upload images (+other high mem tasks) and this bumps up the memory allocation of the httpd child processes to 100-150mb. In order to stop swapping I'm currently setting MaxClients in httpd.conf to 20. However this lowers maximum simultaneous requests. Will this be a problem when the website goes live? What is the best configuration? Info: Drupal 6, PHP 5, Apache 2.2 (Prefork atm) I'm thinking about Worker MPM, two apache instances or low MaxRequestsPerChild.

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• Windows Physical Direct Memory Mapping

  - by chrisjleaf

  I'm a bit disappointed there is almost no discussion of this no matter where I look so I guess I'll have to ask. I'm writing a cross platform memory bench marking application which requires direct physical address mapping rather than virtual addressing. EDIT The solution would look something like the Linux/Unix system calls: int fd = open("/dev/mem", O_RDONLY); mmap(NULL, len, PROT_READ, MAP_SHARED, fd, PHYSICAL_ADDRESS_OFFSET); which will require the kernel to either give you a virtual page mapping to the desired physical address or return that it failed. This does require supervisor privileges but that is ok. I have seen a lot of information about shared memory and memory mapped files but all of these reside on disc and are thus not really useful when I'm trying to make a system dependent read. It is very similar to writing an IO driver although I do no need write permissions to the physical address. This site gives an example of how to do it on a driver level using the Windows Driver Kit: NT Insider: Sharing Memory between drivers and applications This solution would probably require Visual Studio which currently I do not have access to. (I have downloaded the WDK api but it complained about my use of GCC for Windows). I'm traditionally a Linux programmer so I'm hoping there might be something really simple I'm missing. Thanks in advance if you know something I don't!

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• Server not responding to SSH and HTTP but ping works

  - by yes123

  Hello guys, I requested an hard reboot because none of ssh and http worked. Ping worked normally. Which logs should i check to understand what was the problem? Thanks! (debian 6 on lamp) Edit: my memory and swap: Mem: 4040068k total, 1114920k used, 2925148k free, 109212k buffers Swap: 1051384k total, 0k used, 1051384k free, 283820k cached 4 GB ram (and more than 1TB of HDD) The cause is from 2 days ago: look how the usage of swap goes +60% in less than 10hours My control panel reports this as top 5 memory usage process: If every apache2 process is 190MB large that sux because IF i do TOP i have 262 sleeping process most of them are apache2! My apache mpm_prefork settings are: <IfModule mpm_prefork_module> StartServers 5 MinSpareServers 5 MaxSpareServers 10 ServerLimit 1500 MaxClients 1500 MaxRequestsPerChild 2000 </IfModule> KeepAlive On MaxKeepAliveRequests 100 KeepAliveTimeout 4

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• Installing php(suexec) for Apache

  - by John

  I've got Apache installed and running but how do i install and run PHP as fastcgi so it runs as its own user? here is my apache config: ./configure --prefix=/usr/local/apache2 --enable-rewrite=shared --enable-so --enable-suexec --disable-asis --disable-autoindex --enable-cache --enable-deflate --enable-disk-cache --enable-expires --enable-file-cache --enable-mem-cache --enable-ssl --enable-vhost-alias --with-mpm=prefork --with-port=8080 here is my php config: ./configure prefix=/usr/local/php --without-pear --enable-safe-mode --enable-magic-quotes --with-apxs2=/usr/local/apache2/bin/apxs --disable-cli --disable-cgi --enable-force-cgi-redirect --enable-fastcgi --with-mysql --with-gd --with-jpeg-dir=/usr/lib --with-png-dir=/usr/lib --with-freetype-dir=/usr/lib --enable-calendar --with-curl --enable-mbstring --with-mcrypt

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