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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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• Changing path to basedir of mysql

  - by shantanuo

  When-ever I need to start mysql from command line, I need to cd to the base directory and then use mysql command as shown below: # cd /home/ec2-user/percona-5.5.30-tokudb-7.0.1-fedora-x86_64/ # ./bin/mysql Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 3 mysql> How do I start mysql simply by typing "mysql" at command prompt? I tried to export the path but it did not work. export path=$PATH:/home/ec2-user/percona-5.5.30-tokudb-7.0.1-fedora-x86_64/bin/

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• rsync --files-from (find + cat)

  - by Edward

  I try command rsync -v --files-from=/path/to/list.lst /home/user /path/to/backup list.lst contains for example .gnupg/ .pki/ .gnome2/keyrings/ .mozilla/firefox/*.default/bookmarkbackups/ .mozilla/firefox/*.default/bookmarks.html .mozilla/firefox/.default/.db files .mozilla/firefox/.default/.sqlite and i get error on all strings with * "failed: No such file or directory". Can anybody help me, or as variant can i combine find `cat /path/to/list.lst` with rsync?

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• Hearing a clicking noise from soundcard all the time

  - by Mehrdad

  I have installed Fedora 17 on my laptop. A few days ago I updated my fedora (but not upgraded). I shut down my computer and since the next time I turned it on I am hearing a clicking noise all the time from speakers. Even when I plug my headphones in I hear the noise through the headphone. I surfed over the internet and found the following shell commands: su -c 'echo "options snd_hda_intel power_save=0" /etc/modprobe.d/snd_hda_intel.conf' su -c 'echo 0 /sys/module/snd_hda_intel/parameters/power_save' I tried them but they didn't work. Here is the part of "lspci" command related to my sound-card: 00:1b.0 Audio device: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) High Definition Audio Controller (rev 03) I have to add that my sound-card is working and I can play some audio file, I mean I can hear the voice and noise simultaneously. But everything is OK in windows xp which is also installed on my laptop. Could it be related to the sound-card driver? If so, how can I revert it to the previous version?

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• rsync - failed to set permission - operation not permitted

  - by Jerome Ansia

  I got the following command with this error rsync -avz --links -O /home/jansiatest/.jenkins/workspace/svn_to_demo/trunk/CPS/ [email protected]:/home/tasklite/temp sending incremental file list ./ rsync: failed to set permissions on "/home/tasklite/temp/.": Operation not permitted (1) But the thing is that i don't want to change permission of "/home/tasklite/temp/". How can i set that?

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• How to delete files on the command line with regular expressions?

  - by Jack

  Lets say I have 20 files named FOOXX, where XX is the number of the file, eg 01, 02 etc. At the moment, if I want to delete all files lower than the number 10, this is easy and I just use a wildcard, eg rm FOO0* However, if I want to delete specific files ina range, eg 13-15, this becomes more difficult. rm FPP[13-15] does not work, and asks me if I wish to delete all files. Likewse rm FOO1[3-5] wishes to delete all files that begin with FOO1 So, what is the best way to delete ranges of files like this? I have tried with both bash and zsh, and I don't think they differ so much for such a basic task?

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• Is there a way to control two instantiated systemd services as a single unit?

  - by rascalking

  I've got a couple python web services I'm trying to run on a Fedora 15 box. They're being run by paster, and the only difference in starting them is the config file they read. This seems like a good fit for systemd's instantiated services, but I'd like to be able to control them as a single unit. A systemd target that requires both services seems like the way to approach that. Starting the target does start both services, but stopping the target leaves them running. Here's the service file: [Unit] Description=AUI Instance on Port %i After=syslog.target [Service] WorkingDirectory=/usr/local/share/aui ExecStart=/opt/cogo/bin/paster serve --log-file=/var/log/aui/%i deploy-%i.ini Restart=always RestartSec=2 User=aui Group=aui [Install] WantedBy=multi-user.target And here's the target file: [Unit] Description=AUI [email protected] [email protected] After=syslog.target [Install] WantedBy=multi-user.target Is this kind of grouping even possible with systemd?

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• Using mongodump with an auth enabled mongodb server

  - by bb-generation

  I'm trying to do a daily backup of my mongodb server (auth enabled) using the mongodump tool. mongodump provides two parameters to set the credentials: -u [ --username ] arg username -p [ --password ] arg password Unfortunately they don't provide any parameter to read the password from stdin. Therefore everytime I run this command, everyone on the server can read the password (e.g. by using ps aux). The only workaround I have found is stopping the database and directly accessing the database files using the --dbpath parameter. Is there any other solution which allows me to backup the mongodb database without stopping the server and without "publishing" my password? I am using Debian squeeze 6.0.5 amd64 with mongodb 1.4.4-3.

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• circumstances where software change leads to device damage

  - by nerorevenge

  Recently I changed a friend's OS from a really virus filled windows 7 to Ubuntu ..but kept changing os's because lsusb wouldn't detect the camera.But after coming back to windows, the camera wasn't detected, though I must point out the device driver for the camera was never found. The Sony 'technician' told me that that since the dev-manager of windows 7 couldn't detect the camera , irregardless of whether the device driver was installed, the software change must have damaged the hardware. I was wondering if there is any truth to it.

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• How to find proper codec for Xubuntu?

  - by smwikipedia

  I have just installed the Xubuntu. And I feel that to use it play a mp3 is like kill myself twice. I try to play it with Exaile, the boxed player with Xbuntu. But it says I need to install some mpeg codecs. I found so many depends with sudo apt-cache depends. How to install them? one by one?! Many thanks.

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• Background process and SIGHUP

  - by Charles Salvia

  My understanding is that a program that is associated with a terminal will receive the SIGHUP signal if that terminal is closed. This usually will terminate the program. I also know that you can use the nohup command along with the & symbol to run the program in the background, and disassociate it from the terminal so that the program is not terminated when the terminal closes (on log out.) However, suppose a program is run normally without nohup, but is then suspended using Cntl-Z. If the program is then resumed in the background using the bg command, will it receive the SIGHUP signal on log out? Or to put it another way: if I have a program which is already running, and I don't want to stop it but I'd like to log out, can I suspend it using Cntl-Z and run it in the background using bg? Or will the program be terminated when I log out?

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• SSD suddenly full

  - by Daniel

  Today the hard drive of our server was suddenly full. The disk usage always stayed around 50 % in the weeks and months before (old data is regularly expunged from the server). I deleted 10 GB of files in /tmp, which strangely freed 51 GB. Here is what I did: root@***:~# df -h Dateisystem Size Used Avail Use% Eingehängt auf /dev/sda3 139G 137G 0 100% / tmpfs 3,9G 0 3,9G 0% /lib/init/rw udev 3,9G 116K 3,9G 1% /dev tmpfs 3,9G 0 3,9G 0% /dev/shm /dev/sda1 985M 25M 910M 3% /boot root@***:/var# du -hs * 3,3M backups 438M cache 9,4G lib 4,0K local 12K lock 76M log 24K mail 4,0K opt 88K run 184K spool 10G tmp 12K www root@***:/var/tmp# find -type f -print0 | xargs -0 rm root@***:/var/tmp# df -h Dateisystem Size Used Avail Use% Eingehängt auf /dev/sda3 139G 81G 51G 62% / tmpfs 3,9G 0 3,9G 0% /lib/init/rw udev 3,9G 116K 3,9G 1% /dev tmpfs 3,9G 0 3,9G 0% /dev/shm /dev/sda1 985M 25M 910M 3% /boot Any explanation as to why deleting 10 GB in /tmp gave me back 51 GB on the disk? Could this point to an SSD failure? Are there any tools for Debian to test SSD health? I already have checked syslog. The first entry relating to this incidient is a mysql message: 1:22:02 [ERROR] /usr/sbin/mysqld: Disk is full writing... So I have absolutely no idea what caused this.

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• Is it possible to install Photomatix under wine?

  - by chris

  Is it possible to install Photomatix under wine? I'm running Ubuntu 9.04, and I've tried both the default download and the embedded .net version. The first attempts to install the .net framework 1.1, and fails, while the 2nd appears to install but won't run. After a bit of googling, er, binging, I tried adding the .net 2.0 runtime via winetricks, and now it appears to install OK, but still won't run - either from the wine menu, or from the command line. Is it possible? What do I need to do?

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• LUKS-Encrypted Root Partition in Ubuntu 9.04

  - by Martindale

  I have a LUKS-encrypted root partition that I have installed Ubuntu 9.04 to. I have of course placed /boot on a separate ext2 partition, and my boot loader loads and functions correctly. However, I can't seem to get my initrd to load the LUKS-encrypted root using the appropriate /dev/mapper/ address. What hooks and scripts do I need to add to get this to function correctly, and what is the correct way to regenerate my initrd? I can CHROOT into this install, and everything works fine - but I just can't seem to get it to actually boot. Help!

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• Messy Filesytem : Duplicate File Removal from the command line

  - by jrause

  In debian/ubuntu I want to a) create a list of all the files in one directory tree b) do the same for a second directory tree c) compare the two lists such that, only the file NAMES are compared (i.e. just comparing the "file.txt" part so that "/home/folder/file.txt" == "/home/secondfolder/folder/file.txt) d) output a list of all the duplicates can anyone please explain how to do this using scripting languages or regex or something?

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• CentOS 6 - iptables preventing web access via port 80

  - by bsod99

  I'm setting up a new web server with CentOS 6.2 and am not able to connect via the web. Everything looks set up correctly in httpd.conf and Apache is running, so I'm assuming it's an iptables issue. Is there anything in the following which could be causing the issue? # iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination ACCEPT all -- anywhere anywhere state RELATED,ESTABLISHED ACCEPT icmp -- anywhere anywhere ACCEPT all -- anywhere anywhere ACCEPT tcp -- anywhere anywhere state NEW tcp dpt:ssh REJECT all -- anywhere anywhere reject-with icmp-host-prohibited ACCEPT tcp -- anywhere anywhere tcp dpt:http Chain FORWARD (policy ACCEPT) target prot opt source destination REJECT all -- anywhere anywhere reject-with icmp-host-prohibited Chain OUTPUT (policy ACCEPT)

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• How do I make a virtualised WAN?

  - by EnchantedEggs

  I want to create a virtualised WAN. As in, I want to have a couple of VMs (VBox) on one physical host machine, that exist on separate LANs, but that can talk to each other. Do I make the VMs, set them up with different IP addresses (e.g. 1.2.3.4 and 5.6.7.8) and then configure port forwarding between them somehow??? I've seen articles that set up port forwarding on port 2222, but I don't really understand why this works. How is setting up the VM to listen to port 2222 and then port forward from there to, say, port 80, any different from just telling the VM to listen on port 80 in the first place? FYI, the VMs run Ubuntu Desktop 14.x.

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• Set up Gmail with Google apps for own domain

  - by erdomester

  I rent a server from a German company. I have remote access to it as well as WHM and CPanel. I decided to use Google's mail servers for obvious reasons. I am not an admin just an average guy trying to set up what needs to be set up. The problem is I am unable to make the necessary settings. I watched Youtube tutorials, followed written ones as well as Google's help, but there is (at least) one serious problem with my domain settings. The domain console alwasy says Your MX records are incorrect When I check dappwall.com in mxtoolbox.com it says Pref Hostname IP Address TTL 10 mail.dappwall.com 46.4.88.247 24 hrs But this is not the host name. I checked WHM and my hostname is server1.dappwall.com. I can confirm it by typing the hostname command in putty. However, if I do an mx lookup at mxtoolbox.com on server1.dappwall.com or mail.dappwall.com I get Lookup failed after 1 name servers timed out or responded non-authoritatively I ran checks on the google apps toolbox on dappwall.com and two problems emerged: 1.No Google mail exchangers found. Relayhost configuration? 10 mail.dappwall.com In Google Apps > Settings for Gmail > Advanced settings it also says that my current MX records for dappwall.com is Priority Points to 10 MAIL.DAPPWALL.COM. So mail.dappwall.com again. I also have access to a robot provided by the company I rent the server from. Here I see this mail at two places but how should I (if it's necessary) modify this? I set Email routing to Automatically Detect Configuration. 2.There SHOULD be a valid SPF record. "v=spf1 include:_spf.google.com ~all" In the DNS Zone Editor I added this spf record: Name TTL Class Type Record dappwall.com. 1440 IN TXT v=spf1 include:_spf.google.com ~all In the cPanel Email Authentication page it says SPF: Status: Enabled Warning: cPanel is unable to verify that this server is an authoritative nameserver for dappwall.com. [?] Your current raw SPF record is : v=spf1 include:_spf.google.com ~all How can I confirm that my server is an authoritative nameserver for dappwall.com? In WHM Service Configuration Mailserver selection Dovecot was set but I disabled it (i don't know if that's ok). What am I missing here? Where is that mail.dappwall.com coming from?

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• Merging and sorting multiple files with "sort"

  - by NewbiZ

  Hello, I have a bunch of text logfiles in the following format: ID (17 characters) Timestamp (14 characters YYYYmmddHHMMSS e.g. "20060210100040" -> 2006/02/10 10:00:40) Random data (? characters) end of line The files are already sorted by timestamp. I need to get 1 log file with all the logs from multiple logs files, sorted by timestamp. Note that the log files are really huge, around 3-4G each (and there are dozens of them) I tried the following command: sort -s -m -t '|' -k1n,1n +17 -o data_sort.txt *.TXT Here is how I ended up with this command: -s : don't bother with tie results -m : merge all logs files -t '|' : there is no | in my logs, so the whole line should be field 1 -k1n,1n: sort on the first field as a numeric value +17 : the timestamp starts at index 17 -o : output file Actually... it fails miserably. The output file data_sort.txt is just the concatenation of all files, not sorted at all :( I would greatly appreciate if anyone could provide any help on this problem! Thanks

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• Elastix, how to MOVE files from one server to other server?

  - by yudayyy

  In my office, i have to schedule for moving a file from one computer to other computer (Both are using Elastix). My idea is using cron, scp, and rm to do this. So here are the script that i use: scp -r /home/data/* [email protected]:/home/data1 && rm -r /home/data/* That script did the copy, but not remove the source file. I already read this question: Hov to _MOVE_ files with scp? The problem is, the computer doesn't have an internet connection. So i cannot install rsync on my elastix computer. yum install rsync Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile and then it freezes. Any idea how to do this?

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• clocksource tsc unstable

  - by amorfis

  Ok, now I have real server fault ;) After some time from booting (about one minute) my server hangs. All I can do is hard reset. Then after restart in /var/log/kern.log I can find: Jul 29 22:38:57 leonidas kernel: [ 90.729598] longhaul: Failed to set requested frequency! Jul 29 22:38:57 leonidas kernel: [ 90.731252] longhaul: Enabling "Ignore Revision ID" option. Jul 29 22:38:57 leonidas kernel: [ 91.201461] longhaul: Failed to set requested frequency! Jul 29 22:38:57 leonidas kernel: [ 91.201482] longhaul: Disabling ACPI C3 support. Jul 29 22:38:57 leonidas kernel: [ 91.204230] longhaul: Disabling "Ignore Revision ID" option. Jul 29 22:38:58 leonidas kernel: [ 91.416133] longhaul: Failed to set requested frequency! Jul 29 22:38:58 leonidas kernel: [ 91.416152] longhaul: Enabling "Ignore Revision ID" option. Jul 29 22:38:58 leonidas kernel: [ 91.960048] Clocksource tsc unstable (delta = -105611479 ns) I found some resources on the net, and it said to change clocksource, or disable ACPI. I tried disabling ACPI but it didn't help (but I noticed there was longer time before hanging). I can't change clock to hpet, because my system doesn't have such one. Output of cat /sys/devices/system/clocksource/clocksource0/available_clocksource: acpi_pm jiffies tsc My system is ubuntu server on VIA Epia hardware.

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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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• Write to stdin of a running process using pipe

  - by aditya

  I am in a similar situation as in this post But I couln't get the solution provided there to work in my situation as the answer seems related to that question only. In particular, I couldnt understand what was the purpose of cat my.fifo | nc remotehost.tld 10000 In my case, I have a process running and waiting for input. how can I send input to that process using named pipes? I've tried echo 'h' > /proc/PID/fd/0 it just displays 'h' on the process' window.

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• what to do when ctrl-c can't kill a process?

  - by Dustin Boswell

  Ctrl-c doesn't always work to kill the current process (for instance, if that process is busy in certain network operations). In that case, you just see "^C" by your cursor, and can't do much else. What's the easiest way to force that process to die now without losing my terminal? Summary of answers below: Usually, you can Ctrl-z to put the process to sleep, and then do "kill -9 process-pid", where you find the process's pid with 'ps' and other tools. On Bash (and possibly other shells) you can do "kill -9 %1" (or '%N' in general) which is easier. If Ctrl-z doesn't work, you'll have to open another terminal and kill from there.

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• Input traffic shaping

  - by whitequark

  I know that I can shape output traffic with tc or a similar tool. However, I want to shape the input traffic now—actually, I want to prioritize downloading of files of certain type through a slow lossy connection. I know the reason tc can only shape output traffic: the host itself has no direct control over the amount of input traffic. On the other hand, TCP has some measures built in it which prevent the TCP traffic from overflowing a slow connection. So, can I mangle something in TCP header so that the remote host will think my connection is slower than it thinks? Suppose that I am able to set the corresponding mark on both types of connections with iptables. Is there any way to reduce the input bandwidth of connections of first type, but only if connections of second type are present?

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