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• Availability of big files on multiple servers

  - by Imises

  I have to handle many (1'000 - 30'000) big files ranging from 200MB up to 2GB. The demand for these files is variable (0 - 300 downloads / file). This is why a single file must saved on 2 or more servers. My servers are placed in different datacenters (France), with different size HDDs (750GB to 4TB). Currently I share the files using PHP and ncftpget / ncftpput, but it's very slow. I need a solution to handle balancing these files across 7+ servers.

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• printing matching lines when greping all files in a directory

  - by John Kube

  I'm searching within Java files for some occurrence of a phrase: find . -name '*.java' | xargs grep -l 'string' How do I change this command to print to the shell all of the lines which contain a match? Thanks!

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• How to backup Servers to an SSH-Host with low traffic and access to versions and encryption?

  - by leto

  Hello, I've not run backups for the past dont't remember anymore years for my personal stuff until waking up lately and realising contrary to my prior belief: Actually. I care! :) Now I have a central data server at home where I want to attach an external media to, to which I want to save backups of my most important stuff, like years of self-written scripts, database dumps, you name it. I've tinkered with rsync+ssh over the last two years, also tried tar over ssh, but don't know the simplest and most easy to maintain way to do it yet. Heres my workload: A typical LAMP-Server (<5GB Data) which I'd like to backup fully so lots of small files connected via 10Mbit My personal stuff (<750GB Data) from a Mac connected via GE My passwords in an encrypted container (100Mb) from OpenBSD connected via serial-PPP My E-Mail from the last ten years (<25GB) as Maildir which I need to keep in readable format Some archives (tar.*) which I need to backup only once and keep in readable format (Deleted my ideas, as I'm here for suggestions) What I need: 1. Use an ssh-tunnel for data transfer 2. Be quick with lots of small files 3. Keep revisions 4. Be sure the data I save is not corrupted 5. Intelligent resume functions and be able to deal with network congestion :) 6. Compressed and optionally encrypted storage 7. Be able to extract data from backup easily (filesystem like usage would be nice) How would and with what software would you backup this stuff? Hints to tools that can help solve only part of my problem (like encryption) also greatly appreciated. Greets

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• redirect output from dd command

  - by laks

  How to redirect output from dd command to /dev/null ?

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• ubuntu 64 or 32 bit for macbook/vps?

  - by ajsie

  i've got macbook pro and wonder if i should use 64 or 32 bits ubuntu server? and then i've got a vps not hosted by med. how do i know what version to choose? how do you check how many bits your cpu i working with? can i use 64 on 32 and vice versa?

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• which user is the website host

  - by Kossel

  I m learning about server, and I'm configuring nginx mysql php wordpress. the server distro is debian 6. I created a new user and I wish each user is the owner of the site folder /var/www/site.one so I chown -R kossel:kossel site.one my problem is, my wordpress only work if I chmod 644 wp-config.php, which all can read wordpress site suggest that file should be 640. and my question is: when someone open mydomain.com, wordpress has to access wp-config.php file, but which user is it actually using to "read" that file? root? user kossel? anyone else? how can I properly give it permission or owner??

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• How do I tell which kernel module is servicing a /dev device?

  - by regulatre

  How do I find out which kernel module (as seen by typing lsmod) is servicing a particular device in /dev ? In other words, say I have a device, /dev/mouse0 and I want to find out which kernel module is installed to service that device. How do I do that? Another way to look at this is, some loaded kernel modules associate themselves with a device in /dev. How does one find out which device(s) a module is "attached" to?

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• Partitioning of Ubuntu server which will use OpenVZ and encrypted partitions (unlocked through SSH l

  - by DeletedAccount

  Hi, I'm about to install a server. Some context: My HDD is 1 TB and I have 2 GB RAM Ubuntu Server Lucid Lynx AMD 64 I will use OpenVZ and have most functionality separated into containers. To support disk quotas I need to use ext3 (not ext4) for the container partition. Each time I reboot the server I want to be forced to login through SSH and mount the encrypted partitions by typing my password (if someone steals the server, no critical data should be available). I want to have as much as possible encrypted. Yet I want to be able to login through SSH as I don't have a monitor or keyboard at the server. I am not sure how big I need my partitions to be. Being able to resize them later would be nice. I guess it implies using LVM? But the manual partition mount using SSH is also very important (in fact it's more important, if I have to pick one). How do you recommend that I partition the HDD? If I have daemons which needs the encrypted partitions, will they fail and can I just restart them after mounting the needed partitions?

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• ruby on rails server is intermittently slow

  - by Richard

  My rails installation was chugging along nicely. Last night we had to perform a hot-patch with was really a standard deploy of some exception code. Once capistrano finished the operation one of our admins discovered that there were two long running passenger processes. While we have deployed release over the past two weeks it would appear that these processes have been here and alive the whole time. Granted they could have been zombies or any other artifact and at this point we do not know what state they were in. Which leads me to the question: There are so many moving parts between the rails application and the OS/hardware that being a SME is probably no longer possible. So; how does a sysadmin perform root-cause analysis with any certainty? And: When do I just start rebooting servers?

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• What steps should I take to secure Tomcat 6.x?

  - by PAS

  I am in the process of setting up an new Tomcat deployment, and want it to be as secure as possible. I have created a 'jakarta' user and have jsvc running Tomcat as a daemon. Any tips on directory permissions and such to limit access to Tomcat's files? I know I will need to remove the default webapps - docs, examples, etc... are there any best practices I should be using here? What about all the config XML files? Any tips there? Is it worth enabling the Security manager so that webapps run in a sandbox? Has anyone had experience setting this up? I have seen examples of people running two instances of Tomcat behind Apache. It seems this can be done using mod_jk or with mod_proxy... any pros/cons of either? Is it worth the trouble? In case it matters, the OS is Debian lenny. I am not using apt-get because lenny only offers tomcat 5.5 and we require 6.x. Thanks!

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• sticky bit on NFS file system

  - by Kris_R

  I have a system where to the main server (homes, nfs, ntp, queue...) can log-in only root – all the other users use front-end host with NFS-mounted home directories (RW) and all other software directories (read-only). My problem is, that time to time, if root or normal user with sudo makes some administrative works on front-end some homes of normal users getting sticky bits (drwsr-sr-x). If it happens usually the user can't log-in (as long as permission for his home are not changed to drwxr-xr-x). The last time I saw it after compiling some new software (normal user configure;make) and installation from the same directory as root (su and make install or direct as normal user sudo make install). Can somebody explain me why it happens and what should I do to get rid of this problem? p.s. I'm using CentOS 5.7

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• Debian - Problems Unmounting External Hard Drives

  - by user331981

  I recently installed Debian Testing on a new laptop and I just noticed that I am having some issues with unmounting external hard drives. I am using Mate Desktop 1.8.1. With the 1st drive, if I right click on the drive and select “safely remove”: The drive unmounts, spins down, immediately spins back up an remounts. Unable to unmount. With the 2nd drive, if I right click on the drive and select “safely remove”: The drive unmounts but does not spin down. With the 3rd drive, if I right click on the drive and select “safely remove”: The drive unmounts but does not spin down, immediately spins back up but does not remount, and after 20 seconds, it spins down and stays that way. Behavior is the same on both USB 2.0 and USB 3.0 ports. On my last laptop, on which I also used Debian Testing + Mate desktop, the safe removal of drives worked out of the box and I never had an issue with it. The drives would unmount, spin down and stay that way. To remount the drive, one needed to unplug the device and plug it back in. I am unsure how to troubleshoot this issue and I am not sure if it is merely a matter of installing a “missing” package of editing a config file. Thank you in advance.

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• PHP5.3 FastCGI doesn't use global config's values

  - by mega.venik

  There's a Centos6.3 system. Apache 2.2.15 + mod_fcgid + PHP 5.3.3 There's a problem with date.timezone value. It's mentioned in the global /etc/php.ini like this: date.timezone = "Europe/Moscow" And doesn't mentioned in user's local php.ini. As a result, I'm getting lot's of warnings like: Warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Europe/Helsinki' for 'EEST/3.0/DST' instead in ... Including the date.timezone parameter into the user's php.ini solves the problem, but I don't think, that it's the best solution. Maybe someone have faced this problem and can give an advice? Thanks! P.S. Creating /etc/php.d/timezone.ini with the timezone info aslo does nothing:(

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• Ubuntu server users question

  - by Camran

  I have read this article: https://help.ubuntu.com/9.04/serverguide/C/user-management.html But it doesn't go into depth with the privileges section. I need to know how to set privileges of me (as a user). I am the only user, but I want access to everything, but I don't want to manage my VPS logged in as root. So I am creating a username. Anybody have a list of privileges, what they mean and how to set them? Thanks

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• What are secure ways of sharing a server (ssh+LAMP) with friends?

  - by Bran the Blessed

  What is the best way to share a virtual server with friends? More precisely, I have the following assets: A virtual private server (Debian Lenny) with root access for myself, running... SSH apache2 mysql Some unused disk space Some friends in need of hosting The problem I would now like to do the following: Hosting one or several domains per friend My friends should have full access to their domains, including running PHP scripts, for example My friends should not be able to poke around in other directories The security of my server should not be compromised by faulty PHP scripts To clarify: I do trust my friends in the sense that they are not trying to do something evil with their access. I just do not trust the programs they are going to run. So, what are your recommendations for establishing such a scenario? Partial solution I already came up with the following plan: Add chrooted SSH users for my friends Add Apache vhosts per user (point the directories to subdirectories of the homedirectories, i.e. /home/alice/example.com, /home/bob/example.net, etc. But how can I enforce a chroot-like environment for the scripts they are running within these vhosts? Any pointers would be appreciated.

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• Automount vfat (w95 fat32 LBA) on Centos

  - by cpl

  I'm trying to mount an USB flash drive formatted as w95 fat32 LBA (as reported by dmesg) under Centos. I can easily mount it using the mount command: mount /dev/sdx1 /media/mydrive -t vfat But it seems that the system (Centos 6.3) cannot mount it automatically. It mounts all the other filesystem types automatically. I also installed fuse-ntfs and it correctly mounts NTFS drives. How can I enable automount for vfat partiotions too? Thanks

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• Is there anyway that I can set the 'real' memory usage value while running my java code?

  - by vira

  I'm running a code on a server to generate a 10,000x10,000 matrix and save each value into a table (MySQL). I was informed by the administrator that I can use up to 32g of the physical memory of our server but have no idea how to do it. I googling around and so far only found information about setting the virtual memory using -Xmx. I tried it anyway and using top command I got this: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 3981 gv 35 15 32.4g 304m 10m S 1 0.5 9:54.84 java So, it shows that the -Xmx set the VIRT and not the RES value. Is there anyway that I can set the RES value into 32g?

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• wget recursive limited within subdomain

  - by Paul Seangwongree

  I want to download the following subdomain with the recursive option using wget: www.example.com/A/B So if that URL has links to www.example.com/A/B/C and www.example.com/A/B/D, these two should also be downloaded. But I don't want anything outside the www.example.com/A/B subdomain to be downloaded. For example, if www.example.com/A/B/C has a link back to www.example.com, the page www.example.com should not be downloaded. What wget command should I use?

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• Oracle error when logging into database

  - by Bryan

  When I try to log into my db with a specific user I get this message. Below is from the alert log. I can login as system just fine. Anyone know how to figure out what is causing this? Thanks in advance for the help. ----- Error Stack Dump ----- ORA-00604: error occurred at recursive SQL level 1 ORA-01438: value larger than specified precision allowed for this column ORA-06512: at line 2 Oracle 10g OEL 5.5

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• Run script on login with ssh

  - by user912447

  I have a feeling this is quite easy to do but every solution found on google has to do with adding a script to be run whenever someone logs into the machine. What I am looking for is a way to run a script when only I log into the machine. I ssh into a shared computer and need to have it load a couple modules for me and I imagined the easiest way to do this would to just run a script on login. Is there a simple way?

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• debian lenny : problem modifying static ip

  - by supertiti

  hello all, i'm trying to change a static ip assigned to a debian VM. I modified the /etc/network/interfaces file but my debian doesn't seem to like the new settings currently the machine's ip is set to 192.168.1.136 and i want the machine's ip to be set to 192.168.1.8 here's my modified /etc/network/interfaces : auto lo iface lo inet loopback allow-hotplug eth0 auto eth0 iface eth0 inet static address 192.168.1.8 gateway 192.168.1.1 netmask 255.255.255.0

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• PcLinuxOs demands I use only one repository at time. Is it right?

  - by m33600

  I come to your presence with this question that is paralyzing my coding efforts. PclinuxOs was my distro of choice for reliability, but it is jealous and does not permit me to add repos from, say, Debian. The wiki is clear advising on using just one repo, and I end up not finding what I used to find on normal Debians. Multimon, the audio decoder, for example (my other question) is not there. When I try to install multimon with hammer and plies, it returns errors of all kinds. Is there a way to safely and temporarily add a repository, make the install and remove the repo, returning pclinuxos to its stable state?

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• How Do I Find The Hardware Block Read Size for My Hard Drive?

  - by Flame

  I'm trying to figure out the optimal size for a large copy from my hard drive using dd. I'm trying to figure out what the best blocksize to use it, which I would assume is the hardware block size for that drive.

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• Changing the name of a binary packaged application and its evoking command

  - by jerkstore

  I have taken the source code of a large project, App A, and made many modifications to it to produce my version, App B. Both App A and App B compile cleanly on Debian and Red Hat and now I would like to build binary packages for both platforms. The last modification I need to make is ensuring App B can be installed alongside App A without any interference. I should be able to evoke both application-a and application-b in the terminal and have both be listed as separate software in whatever desktop environment is present. The projects have a debian/ folder (containing rules, control, etc.) and an rpm/ folder containing a SPEC file. Currently, building and installing the .rpm and .deb packages works except that App B is recognized as App A and therefore does not meet the aforementioned requirements. ldd shows the programs have the same exact dependencies and I am not able to pursue static linking of libraries. What modifications do I need to make to my project to achieve the desired outcome? Please be specific as I do not have much experience with the packaging process.

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• Apache logs other user read permissions

  - by user2344668

  We have several developers who maintain the system and I want them to easily read the log files in /var/log/httpd without needing root access. I set the read permission for 'other' users but when I run tail on the log files I get permission denied: [root@ourserver httpd]# chmod -R go+r /var/log/httpd [root@ourserver httpd]# ls -la drwxr--r-- 13 root root 4096 Oct 25 03:31 . drwxr-xr-x. 6 root root 4096 Oct 20 03:24 .. drwxr-xr-x 2 root root 4096 Oct 20 03:24 oursite.com drwxr-xr-x 2 root root 4096 Oct 20 03:24 oursite2.com -rw-r--r-- 1 root root 0 May 7 03:46 access_log -rw-r--r-- 1 root root 3446 Oct 24 22:05 error_log [me@ourserver ~]$ tail -f /var/log/httpd/oursite.com/error.log tail: cannot open `/var/log/httpd/oursite/error.log' for reading: Permission denied Maybe I'm missing something on how permissions work but I'm not finding any easy answers on it.

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