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  • Set LD_LIBRARY_PATH and CLASSPATH on cluster nodes before running a hadoop job

    - by Ashish Sharma
    I need to set LD_LIBRARY_PATH and CLASSPATH before running a job a cluster. In LD_LIBRARY_PATH i need to add location of some jars which are required while running the job, As these jars are avaiable at my cluster, similar with CLASSPATH. I have a 3 NODE cluster, I need to set this LD_LIBRARY_PATH and CLASSPATH for all the 3 data nodes so that the following jar are available while running the job

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  • What Logs / Process Stats to monitor on a Ubuntu FTP server?

    - by Adam Salkin
    I am administering a server with Ubuntu Server which is running pureFTP. So far all is well, but I would like to know what I should be monitoring so that I can spot any potential stability and security issues. I'm not looking for sophisticated software, more an idea of what logs and process statistics are most useful for checking on the health of the system. I'm thinking that I can look at various parameters output from the "ps" command and compare to see if I have things like memory leaks. But I would like to know what experienced admins do. Also, how do I do a disk check so that when I reboot, I don't get a message saying something like "disk not checked for x days, forcing check" which delays the reboot? I assume there is command that I can run as a cron job late at night. How often should it be run? What things should I be looking at to spot intrusion attempts? The only shell access is SSH on a non-standard port through UFW firewall, and I regularly do a grep on auth.log for "Fail" or "Invalid". Is there anything else I should look at? I was logging the firewall (UFW) but I have very few open ports (FTP and SSH on a non standard port) so looking at lists of IP's that have been blocked did not seem useful. Many thanks

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  • Raid 5 GPT Partitioning

    - by user39325
    I have a Dell Poweredge r710 server with five 1 TB disks. All of them are in RAID 5. I was trying to install Centos but it says "Your boot partition is on disk using GPT Partition..." I read somewhere that centos can't install on a disk larger than 2TB, so I made some partitions smaller, but it's not working. PS, I am going to install Proxmox on that, but Proxmox also won't accept disks larger than 2TB.

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  • Help remembering name of boot CD (maybe it wasn't a live CD)

    - by daneee
    I am struggling to remember the name of a boot CD I have since lost the disc for. It was great for cloning discs, and resetting passwords. It's NOT the UBCD4Win, and it defos wasn't Knoppix. I have checked the LiveCD list and can't seem to find it there by doing a 'sort by'. I seem to remember it was called something like GS Tools but that might be more or less completely wrong. It had an unusual but memorable name. Makes me wonder how I came across it in the first place!

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  • setting up a samba PDC -error with testparm

    - by Rungano
    Hi guys I have installed a samba PDC but when I test the samba configurations file I am getting errors like these, "Invalid combination of parameters for service homes. Map system can only work if create mask includes octal 010 (S_IXGRP)." My Configuration file is as follows [homes] comment = Home Directories path = /home_srv1/%u valid users = %S read only = No create mask = 0660 directory mask = 0770 browseable = No I tried to google but with no luck, Serverfault is always my best hope. Thanks for helping out.

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  • Prevent rmdir -p from traversing above a certain directory

    - by thepurplepixel
    I hacked together this script to rsync some files over ssh. The --remove-source-files option of rsync seems to remove the files it transfers, which is what I want. However, I also want the directories those files are placed in to be gone as well. The current part of the find command, -exec rmdir -p {} ; tries to remove the parent directory (in this case, /srv/torrents), but fails because it doesn't have the right permissions. What I'd like to do is stop rmdir from traversing above the directory find is run in, or find another solution to get rid of all the empty folders. I've thought of using some kind of loop with find and running rmdir without the -p switch, but I thought it wouldn't work out. Essentially, is there an alternative way to remove all the empty directories under the parent directory? Thanks in advance! #!/bin/bash HOST='<hostname>' USER='<username>' DIR='<destination directory>' SOURCE='/srv/torrents/' rsync -e "ssh -l $USER" --remove-source-files -h -4 -r --stats -m --progress -i $SOURCE $HOST:$DIR find $SOURCE -mindepth 1 -type d -empty -prune -exec rmdir -p \{\} \;

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  • Can't create LVM due to: not found (or ignored by filtering)

    - by James
    I'm planning to use LVM for KVM, and when I try to create a VG it fails, so how can I create my VG and LV ? Thanks [root@server ~]# vgcreate virtual-machines /dev/sda Device /dev/sda not found (or ignored by filtering). Unable to add physical volume '/dev/sda' to volume group 'virtual-machines'. [root@server ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/sda3 2.0T 929G 976G 49% / tmpfs 3.9G 124K 3.9G 1% /dev/shm /dev/sda1 194M 57M 128M 31% /boot [root@server ~]# pvscan No matching physical volumes found

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  • File descriptor linked to socket or pipe in proc

    - by primero
    i have a question regarding the file descriptors and their linkage in the proc file system. I've observed that if i list the file descriptors of a certain process from proc ls -la /proc/1234/fd i get the following output: lr-x------ 1 root root 64 Sep 13 07:12 0 -> /dev/null l-wx------ 1 root root 64 Sep 13 07:12 1 -> /dev/null l-wx------ 1 root root 64 Sep 13 07:12 2 -> /dev/null lr-x------ 1 root root 64 Sep 13 07:12 3 -> pipe:[2744159739] l-wx------ 1 root root 64 Sep 13 07:12 4 -> pipe:[2744159739] lrwx------ 1 root root 64 Sep 13 07:12 5 -> socket:[2744160313] lrwx------ 1 root root 64 Sep 13 07:12 6 -> /var/lib/log/some.log I get the meaning of a file descriptor and i understand from my example the file descriptors 0 1 2 and 6, they are tied to physical resources on my computer, and also i guess 5 is connected to some resource on the network(because of the socket), but what i don't understand is the meaning of the numbers in the brackets. Do the point to some property of the resource? Also why are some of the links broken? And lastly as long as I asked a question already :) what is pipe?

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  • Mail Secure & Stable Open Source Mail Server

    - by Fanar ALHAYALI
    I have asked question on http://stackoverflow.com/questions/9868426/i-need-to-know-which-email-server-i-have-to-use and someone tell me my question would be better on serverfault. I know that this is a common question and asked many times. but there are so many available mail servers that i am not able to decide the one. Kindly tell that which is the Secure, Stable and fast open source mail server for Centos or Redhat Server. Is there any guide which can be used to deploy the mail server with all its components e.g. smtp, pop3, imap, spam, calender server, antivirus, DNS Setting. Currently I'm using sun messaging V6 which installed on Solaris 10 and my boss ask me to make a report for the best mail server today in the marketing? I tried to have a look on Google but I couldn't find interesting information for my report. Any advice would be appreciated.

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  • How can I let my users set PHP.ini settings for wordpress?

    - by jldugger
    I set up a wordpress server from a fairly standard Ubuntu 9.10 for a class and they're constantly running into problems with the default PHP.ini settings. First memory settings were too low, then the file upload limits were too small, etc. And more concerning was a wordpress wide blank page that I suspect was killed for ram consumption but turning on php errors in php.ini didn't reveal anything! I'm not familiar with shared hosting, but I feel there's a way such places allow users to edit such things without needing me to intervene and restart Apache.

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  • I wrote a new X11 keyboard layout file, how do I get my system to recognize it?

    - by grimborg
    I like to configure my keys my way, so I wrote a keyboard symbols file and I put it in /usr/share/X11/xkb/symbols/cat I use it by running setxkbmap cat -variant dvorak (and it works), but it doesn't show up in the console configuration (dpkg-reconfigure console-setup) nor in the Gnome keyboard settings... nor anywhere else, so I have to run setxkbmap every time. I suppose that I have to register it somewhere, but where? Any hints? Thanks!

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  • When should I upgrade to Ubuntu 10.04 (Lucid Lynx)? [closed]

    - by Emyr
    I'm a web developer for a small non-IT firm. When 9.10 came out, I was using it with no adverse effects from about a month before release (iirc, first beta), initially as an upgrade but as a clean install later to ensure my system would be consistent with most other 9.10 systems. The last alpha of 10.04 came out last week, with another 2 weeks before beta. I'm quite eager to do it today, but obviously the usual "not for production systems" notice is still in place. When should I upgrade? Do I need to worry about software installed from source? (./configure, make, make install etc) Is the attraction of a non-brown theme really this tempting for you?

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  • How to get the PID of a process started by /bin/su -c

    - by crash3k
    I'm writing a init.d-script for an java-app. But the java-app should be run by another user. (The OS I'm using is Debian Squeeze.) I already got this: /bin/su - $USER - c "cd $PATH;echo $PASSWORD | $JAVA -Xmx256m -jar $PATH/app.jar -d > /dev/null" & PID=$! /bin/su - $USER - c "echo $PID > $PIDFILE" But this will of course only save the pid of the "/bin/su"-process instead of the pid of the created java-process.

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  • cannot find java even though it is there (ubuntu 12.04)

    - by Jeff Storey
    I'm trying to just execute the java command and it's saying it cannot be found, even though it is there. Here's what my output looks like root@oneiric:/usr/lib/jvm/default-java/bin# ls -al java -rwxrwxrwx 1 uucp 143 5750 2012-09-20 11:14 java root@oneiric:/usr/lib/jvm/default-java/bin# ./java -su: ./java: No such file or directory So the ls shows it's there, but it doesn't seem to execute. Can someone explain why this is?

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  • Using screen to monitor non-interactive scripts (or some other solution)

    - by Michael
    I have some autonomous scripts that run commands on remote machines over ssh. These scripts rely on getting stdout, stderr, and the return code of each command run. I want to be able to monitor the progress of the scripts on each target machine so that I can see if something has hung and possibly intervene if necessary. My initial idea was to have the scripts run commands in a screen session, so that the person monitoring could simply attach to the session with screen -x. However, it was hard to do that from a script since screen is an interactive program. I can send a command to the screen session with screen -S session -X stuff "command^M", but then I don't get the output and return code that I need back. My second idea was to put script /path/to/log in ~/.bash_profile and log the entire session to a file. Then the monitoring person could simply tail the log file. However, this doesn't provide the interactivity that I was looking for. Any ideas on how to solve this problem?

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  • How to set the laptop screen brightness programatically?

    - by zls
    I'm currently migrating to openbox without gnome session. In unity i can use the vendor keys to set the screen brightness, but in openbox I'm on my own. /sys/class/backlight/acpi_video0/brightness works fine, the problem is that I need sudo to set the brightness and that wouldn't work with keyboard mappings. xbacklight -get/set doesn't do or output anything. I don't really want to use xrandr --brightness. Are there any other options or a way to fix the problems with xbacklight or acpi_video0 ?

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  • Only allow root to change filesystem

    - by Uejji
    The VPS I manage uses a simple hard link rsync archive daily backup system saved to a loop file. This is great, because each backup only takes up as much space as what has changed each day, and all user/group permissions are kept. I would like to give users direct access to their home directories in each backup, but I'm worried about intentional or accidental backup data destruction, as how it stands now users can actually change, destroy or add to backed up data they originally owned. I've been looking for a way to mount this filesystem similar to an ro mount option, but something that would still allow rw access to root, but I've had absolutely no luck. In other words, I want users to be able to view and copy their backed up data without actually being able to change it, and have that data maintain the original permissions. I've got no real preferences as far as filesystem, as long as it's a standard unix filesystem that can preserve permissions, support hard links and deny write access to users without actually stripping the w permission from everything.

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  • Running Solr on VPS problem

    - by Camran
    I have a VPS with Ubuntu OS. I run solr om my local machine (windows xp laptop) just fine. I have configured Jetty, and Solr just the same way as on my computer, but on the server. I have also downloaded the JRE and installed it on the server. However, whenever I try to run the start.jar file, the PuTTY terminal shows a bunch of text but gets stuck. I could pase the text here but it is very long, so unless somebody wants to see it I wont. Also, I cant view the solr admin page at all. Does anybody have experience in this kind of problem? Maybe java isn't correctly installed? It is a VPS so maybe installation is different. Thanks UPDATE: These are the last lines from the terminal, in other words, this is where it stops every time: INFO: [] webapp=null path=null params={event=firstSearcher&q=static+firstSearcher+warming+query+from+solrconfig.xml} hits=0 status=0 QTime=9 May 28, 2010 8:58:42 PM org.apache.solr.core.QuerySenderListener newSearcher INFO: QuerySenderListener done. May 28, 2010 8:58:42 PM org.apache.solr.handler.component.SpellCheckComponent$SpellCheckerListener newSearcher INFO: Loading spell index for spellchecker: default May 28, 2010 8:58:42 PM org.apache.solr.core.SolrCore registerSearcher INFO: [] Registered new searcher Searcher@63a721 main Also you should know that I installed jetty by just dragging the folders from my HD to the VPS server.

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  • How do you enable webcam support in Facebook for Ubuntu 10.04?

    - by Jonathan
    I think I have finally arrived at an insolvable equation: Chromium v.7 + Ubuntu 10.04 + Sun Java 6 + Webcam + Facebook + Flash 10 = non-functional All of those items listed above are potential points of failure in this situation, and any help narrowing them down would be fantastic. I am simply trying to enable webcame support directly through Facebooks website. Forum searches and the usual googling turn up few posts related to this specific equation. Two of the major suggestions include: 1) Installing the Sun (I refuse to say oracle sob)-provided Java implementation instead of the OpenJDK normally installed in Ubuntu. And yes, after installing it, I did update all my default supports to use the sun commands over the openjdk. 2) Somehow enabling Facebook as a permitted site to access my webcam using Flash settings. I have not been able to explore option 2 because I cannot find a way to adjust the Flash settings in chromium 7. Other factors that do not help include the fact that I am pretty sure facebook changes its webcam interface every 10 seconds just to keep troubleshooters and support personnel on their toes. If anyone has a OTP that informs us of the next shift in the app, a leak would be greatly appreciated!

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  • RSync over SSH hangs and fails with timeout

    - by tx2
    Client: Gentoo, GCC 4.3.4, RSync 3.0.9 Server: Ubuntu 10.04.4 LTS, RSync 3.0.7 Client and server connectet through is Internet, about 2Mbps. Ping is ok. RSync called on any files in any direction hangs on random file, then, after timeout, fails with: [sender] io timeout after 30 seconds -- exiting rsync error: timeout in data send/receive (code 30) at io.c(140) [sender=3.0.9] [sender] _exit_cleanup(code=30, file=io.c, line=140): about to call exit(30) In 1/10 trys is pass correctly. I've tryed to add SSH options TcpRcvBufPoll=yes, KeepAlive=yes; disable and enable rsync compression -- no changes. How can i make rsync works properly?

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  • memtest86+ crashing on server

    - by user148723
    we have a few DELL 1950 servers. 1 of this servers has CentOS6.3 and its randomly rebooting so I suspected it was hardware. (no log generated) the other 4 servers do not randomly reboot. We passed memtest86+ on the 5 servers, and on 3 of them memtest86+ crashes (displaying an odd and colorful screen, like if a video card failed) Although I tested old memtest86 (not +), and all servers did not crash. I also tested other RAM testers utilities, no tool failing. have any of you guys experience this? thanks

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  • Listing packages in a repositiory?

    - by noloader
    I'm working on Ubuntu 12.04 Server. I want to install OpenStack, so I enabled the Cloud Archive repo: sudo add-apt-repository cloud-archive:havana After the subsequent update and upgrade, I noticed python-crypto changed. python-crypto recently fixed a CVE, so I would like to ensure I'm using the patched version of python-crypto. I'd also like to compare the python-crypto in both Ubuntu and Cloud Archive. How does one list the package information for both Ubuntu::python-crypto and CloudArchive::python-crypto? (And sorry I could not tag this with apt-cache. Its not available in the list of tags). Thanks in advance

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  • Script to run chown on all folders and setting the owner as the folder name minus the trailing /

    - by Shikoki
    Some numpty ran chown -R username. in the /home folder on our webserver thinking he was in the desired folder. Needless to say the server is throwing a lot of wobbelys. We have over 200 websites and I don't want to chown them all individually so I'm trying to make a script that will change the owner of all the folders to the folder name, without the trailing /. This is all I have so far, once I can remove the / it will be fine, but I'd also like to check if the file contains a . in it, and if it doesn't then run the command, otherwise go to the next one. #!/bin/bash for f in * do test=$f; #manipluate the test variable chown -R $test $f done Any help would be great! Thanks in advance!

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