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  • OpenVZ vs KVM for Linux VMs

    - by Eliasdx
    Hardware: Intel® Core™ i7-920, 12 GB DDR3 RAM, 2 x 1500 GB SATA-II HDD (no SoftRaid because Proxmox developers don't support softraid and they are sure you'll run into problems) Software: Proxmox VE with KVM and OpenVZ support and debian everywhere I want to run multiple Linux VMs on this server. One for a firewall (I want to try pfSense), one for MySQL, one VM for nginx (my stuff) and ~2 VMs with nginx for other people's web sites. I don't think that pfSense will run in an OpenVZ environment but it should run in KVM. The question is if I should setup the other VMs using KVM or OpenVZ. In OpenVZ they should have less overhead for the OS itself but I don't know about the performance. I heard that KVM is more stable but needs more RAM and CPU. I found this diagram showing a OpenVZ setup on the same hardware I'm using. This guy uses an own VM for each and every website which is running on his server. I can't think of any advantage why he's using so many VMs.

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  • Error headers: ap_headers_output_filter() after putting cache header in htaccess file

    - by Brad
    Receiving error: [debug] mod_headers.c(663): headers: ap_headers_output_filter() after I included this within the htaccess file: # 6 DAYS <FilesMatch "\.(ico|pdf|flv|jpg|jpeg|png|gif|js|css|swf)$"> Header set Cache-Control "max-age=518400, public" </FilesMatch> # 2 DAYS <FilesMatch "\.(xml|txt)$"> Header set Cache-Control "max-age=172800, public, must-revalidate" </FilesMatch> # 2 HOURS <FilesMatch "\.(html|htm)$"> Header set Cache-Control "max-age=7200, must-revalidate" </FilesMatch> Any help is appreciated as to what I could do to fix this?

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  • Installing checkinstall on x86_64 bit

    - by SephMerah
    I downloaded the source for check install. checkinstall-1.6.2.tar.gz. I then tar -xzvf checkinstall-1.6.2.tar.gz Then I make. It prints this error: [root@ip-50-63-180-135 checkinstall-1.6.2]# make for file in locale/checkinstall-*.po ; do \ case ${file} in \ locale/checkinstall-template.po) ;; \ *) \ out=`echo $file | sed -s 's/po/mo/'` ; \ msgfmt -o ${out} ${file} ; \ if [ $? != 0 ] ; then \ exit 1 ; \ fi ; \ ;; \ esac ; \ done make -C installwatch make[1]: Entering directory `/home/sofiane/checkinstall-1.6.2/installwatch' gcc -Wall -c -D_GNU_SOURCE -DPIC -fPIC -D_REENTRANT -DVERSION=\"0.7.0beta7\" installwatch.c installwatch.c:2942: error: conflicting types for 'readlink' /usr/include/unistd.h:828: note: previous declaration of 'readlink' was here installwatch.c:3080: error: conflicting types for 'scandir' /usr/include/dirent.h:252: note: previous declaration of 'scandir' was here installwatch.c:3692: error: conflicting types for 'scandir64' /usr/include/dirent.h:275: note: previous declaration of 'scandir64' was here make[1]: *** [installwatch.o] Error 1 make[1]: Leaving directory `/home/sofiane/checkinstall-1.6.2/installwatch' make: *** [all] Error 2 I searched extensively on this issue and this solution looks promising. Should I attempt to install checkinstall as an fpm? What would be the best way to go about that? Centos 6.3 x86_64

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  • Getting Pango-WARNING: Invalid UTF-8 string passed to pango_layout_set_text()

    - by geerlingguy
    About three days ago, I noticed the exim mailqueue started filling up on one of my servers, and upon inspecting some of the emails using # exim -Mvb $ID, I noticed they were being sent to some system email address (which is not a real address), and the body of the messages were as follows: (process:8259): Pango-WARNING **: Invalid UTF-8 string passed to pango_layout_set_text() I'm wondering what could be causing this strange issue, as I've never heard of 'pango' at all... I've never seen that function used in my lifetime! It seems the process id (PID) is for an apache process, though, as the pids are always gone by the time I use # ps -aux to look them up. Edit: Whoops! Forgot to include the subject - looks like it's actually munin-cron that's bringing up the issue: Subject: Cron /usr/bin/munin-cron --force-root

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  • Webapp in Jetty can't find properties file after running a couple days

    - by Cuga
    I have a webapp running in Jetty on Mac OS 10.6. After a few days of it running and without the server losing power or rebooting, it seems to stop working saying it can't find a properties file. This properties file is included inside the .war file deployed to the /webapps directory. If I restart Jetty as the superuser the web service works again just fine. Can anyone lend any advice to what's going on and how I can fix it? The error being shown when it isn't working is: Problem accessing /my-web-service. Reason: INTERNAL_SERVER_ERROR Caused by: java.lang.NullPointerException at com.company.service.Dao.readFromPropertiesFile(BwDao.java:35) at com.company.service.ServletHandler.doGet(ProxyClass.java:66) ... at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404) at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:410) at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582) Here's where the properties files exist that it's trying to read from the .war file: And this is how the properties are being read from the classpath: Properties properties = new Properties(); properties.load(Thread.currentThread().getContextClassLoader().getResourceAsStream( "app.properties")); Again, this does work just fine if I have just restarted the server, but it seems to fail after running a few days.

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  • Fedora 15: em1 recently dissapeared and hostapd no longer serves internet to wirelessly connected devices

    - by Daniel K
    I have a laptop running hostapd, phpd, and mysql. This laptop uses an Ethernet connection to connect to the internet and acts as a wireless access point for my workplace's wifi devices. After installing some software and reconnecting my Ethernet elsewhere, my "em1" device is no longer present and wirelessly connected devices can no longer reach the internet. The software I recently installed is: pptp, pptpd, and updated some fedora libraries. I have also recently moved my desk and laptop to another location and thus had to reconnect the Ethernet elsewhere. Wifi devices no longer have access to the internet. Wirelessly connected devices are able to successfully log into the laptop, showing full strength, correct SSID, and uses the proper password. However, when I tried to connect to a site like google, the request times out. The device "em1" also no longer appears on my machine. Running: # ifup em1 will give me the following output: ERROR : [/etc/sysconfig/network-scripts/ifup-eth] Device em1 does not seem to be present, delaying initialization. And running: # dhclient em1 has the following output: Cannot find device "em1" When I run # dmesg|grep renamed, I get the following: renamed network interface eth0 to p4p1. I've tried to connect to the internet through p4p1 directly from the laptop and was successful. However, my wireless devices connected to my laptop are not able to connect to the internet. I have uninstalled pptp and pptpd using # yum erase ... but the problem still persists. To install pptp I used: # yum install pptp To install pptpd I did the following: # rpm -Uvh http://poptop.sourceforge.net/yum/stable/fc15/pptp-release-current.noarch.rpm # yum install pptpd To update my fedora libraries I used: # yum check-update # yum update EDIT: Running # route produces the following results: Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface default 10.11.200.1 0.0.0.0 UG 0 0 0 p4p1 10.11.200.0 * 255.255.252.0 U 0 0 0 p4p1 172.16.100.0 * 255.255.255.0 U 0 0 0 wlan0

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  • df shows negative values for used

    - by GriffinHeart
    Hey everyone, first question around here. I have a centos 5.2 server and running df -h i get this: Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup00-LogVol00 672G -551M 638G 0% / /dev/hda1 99M 12M 82M 13% /boot tmpfs 2.0G 0 2.0G 0% /dev/shm that space wasn't even near 10% usage the last time it showed a correct value, i'm at a loss with whats going on. Thanks.

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  • How do you apply development practices like version control, testing and continuous integration/deployment to system administration?

    - by arex1337
    Imagine you're going to manage a number of servers with a number of different services that's used by a number of people. Now say you want to reconfigure or replace some software on one of those servers. Obviously you don't want to work on servers that are in production. If this was a code change, as a developer, I would make the change on my local development machine, test it locally and commit the change to a version control system. The changes could then be deployed in a staging environment, tested further and finally deployed in a production environment. It would also be easy for me to roll back, if necessary. Generally, or specifically, how do you achieve this in system administration? (The first thing that comes to mind is to use virtual machines and put virtual machine images in version control, but I'm sure there is a lot of literature and clever solutions I'm not presently aware of.)

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  • Why does cifs asks for su rights to write any data into it?

    - by Denys S.
    I'm mounting a windows share as follows: sudo mount -t cifs //192.168.178.49/public -o users,username=name,dom=domain,password=pword /mnt/nas Then I'm trying to create a simple file with some basic text: touch /mnt/nas/me.txt And get an error, however, the file is created (contains 0B of data though): touch: cannot touch ‘me.txt’: Permission denied With sudo it works flawless. How can I allow my current user to write data to the share? Is there a mount option?

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  • Should I split my website into different servers

    - by Nyxynyx
    I have a website where a user uploads photos, the photos gets resized and thumbnailed, and stored on the server. At the same time, there are some INSERTS into a MySQL table regarding the photo uploaded (like description, user id etc). The site currently runs off a managed VPS, and I love the support it provides. However it is expensive to store the many small photos and the resizing and thumbnailing processes do cause spikes on the app performance. (Amazon S3 is pretty expensive, especially considering the costs for uploading many small files) Question: Will it be a good idea to move the image processing operations and image storage to another server which is an unmanaged dedicated server with a much lower cost/gb and keep the current VPS for its 24/7 support and hosting the webapp? Or should I move the entire site to the dedicated server? VPS Specs 16 cores 2.4GHz (E5620) 1GB memory 60GB Storage 3.5TB transfer $43/mth Managed (24/7) Dedicated Specs i3 2130 2 cores 3.4+ GHz 16 GB DDR3 2 x 1TB SATA2 storage 15 TB transfer $79/mth Unmanaged (Weekdays support) Software used Apache PHP MySQL Solr PostgreSQL ImageMagick

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  • Make `mount` choose a device

    - by o_O Tync
    I have a mount point — let it be /media/question — and two possible devices: a physical HDD and a remote NFS folder. Sometimes I plug the device in physically, in other cases I mount it via NFS. Is there a way to specify both of them in fstab so that executing mount /media/question will preferably choose physical volume, and when it's not available — NFS?

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  • Tab Completion In Emacs shell-mode SSH Sessions

    - by Sean M
    My current use pattern of emacs results in my having several shell-mode buffers open, each running an ssh session. I am running into an issue with this, though - when I try to tab-complete file names and other things in my remote session, the shell attempts to use completions available on the local machine instead of on the remote machine. For example, if the file ~/foobar exists on the local machine and ~/frob exists on the remote machine, typing in ~/f and pressing tab results in ~/foobar instead of completing correctly. If I use ssh outside of emacs and try the same thing, I get the correct completion of ~/frob instead. How can I get tab-completion to complete the way it does in normal ssh sessions ?

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  • Curl authentication

    - by Jack Humphries
    I am trying to download a file with cURL from a password protected directory on my site. It is not working. Instead of the downloading the requested file, it downloads a HTML file that says, "Authentication Required!" I'm not sure what the problem is. I've tried both of these (with the same result). The username and password are correct (and if the link below is used in a web browser, the file downloads successfully). 1) The username and password are included as part of the URL. curl https://username:[email protected]/auth/file.dmg --O /file.dmg; 2) The username and password are included as an option. curl -u username:wordpass.1 https://www.example.com/auth/file.dmg --O /file.dmg;

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  • Color Schemes don't look right in CLI vim

    - by person
    I was having a bit of trouble reading the dark red strings of Vim's default color scheme, so I decided to switch to a different one. http://code.google.com/p/vimcolorsch...kboard.vim?r=2 http://files.werx.dk/wombat.vim However, when I set my color schemes to these, not only do they not come out correctly (for example, comments are bright blue), but these 2 somehow come out looking exactly the same! Am I doing something wrong, or are these colors restricted in the terminal so default colors are being chosen?

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  • Removing DS_Store files and variants?

    - by Ron Gejman
    I am running an Ubuntu 10.04.1 LTS server. Frequently I open up files using AFP from my Mac. Inevitably this created .DS_Store files on the server (although for some reason they are named :2eDS_Store. However, it also creates variants on DS_Store files. These variants are often named similarly to other files in that directory. E.g.: ~$ ls total 60K -rw-r--r-- 1 tarakhovsky 16K 2010-11-30 18:28 :2eDS_Store drwx--S--- 4 tarakhovsky 4.0K 2010-11-08 13:58 :2eTemporaryItems/ lrwxrwxrwx 1 tarakhovsky 15 2010-10-19 17:44 bigdisk -> /media/bigdisk// ... drwxr-xr-x 3 tarakhovsky 4.0K 2010-11-03 18:24 Temporary Items/ drwxr-xr-x 3 tarakhovsky 4.0K 2010-11-30 01:34 tmp/ ... I've disabled creation of DS_Store files using: defaults write com.apple.desktopservices DSDontWriteNetworkStores true so hopefully this won't continue to occur—but I really want to get rid of all of the existing variants of DS_Store files already on the server. Any ideas as to why these variants are being created and how I can get rid of them all?

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  • xrander detect only one display

    - by cupakob
    Hi all, i have a problem, to get a picture on my tv over VGA (and also over S-Video to SCART). I've tried it first over xorg, but without success. After that i tried xrand, but xrander detect only my laptop display, here the output bufka [~] $ xrandr -q Screen 0: minimum 1680 x 1050, current 1680 x 1050, maximum 1680 x 1050 default connected 1680x1050+0+0 0mm x 0mm 1680x1050 50.0* 51.0 52.0 Any suggestions, how to solve the problem? My video card is Nvidia Geforce 8600M GT, TV is LG M227WPD and OS Ubuntu Lucid...

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  • Enable gzip on Nginx

    - by Rob Wilkerson
    Yes, I know that there are a lot of other questions that seem exactly like this out there. I think I must've looked all of them. Twice. In desparation, I'm adding another in case my specific configuration is the issue. Bear with me. First, the question: What do I need to do to get gzip compression to work? I have an Ubuntu 12.04 server installed running nginx 1.1.19. Nginx was installed with the following packages: nginx nginx-common nginx-full The http block of my nginx.conf looks like this: http { include /etc/nginx/mime.types; access_log /var/log/nginx/access.log; sendfile on; keepalive_timeout 65; tcp_nodelay on; gzip on; gzip_disable "msie6"; include /etc/nginx/conf.d/*.conf; include /etc/nginx/sites-enabled/*; } Both PageSpeed and YSlow are reporting that I need to enable compression. I can see that the request headers indicate Accept-Encoding:gzip,deflate,sdch, but the response headers do not have the corollary Content-Encoding header. I've tried various other config values (gzip_vary on, gzip_http_version 1.0, etc.), but no joy. As far as I know, I can only assume that nginx was compiled with compression support, but if there's any way to verify that, I'd love to know. If anyone sees anything I'm missing or can suggest further debugging, please let me know. I'm no sysadmin and I'm new to Nginx so I've exhausted everything I can think of or have read. Thanks.

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  • correct file permissions for trac and git user to access gitolite server repos

    - by klemens
    hi, sounds like a stupid questions (to me), but i couldn't find any info. on my server i host some git repositories via gitolite, and have a trac for every repository. i have a user called git to push/pull from server (git clone git@server:repo). and trac is a apache vhost with mod_wsgi. this runs with the www-data user. so what riddles me (maybe because I have not much of a clue about file-permissions at all) is whats the best permissions setup (chown, chmod) for the git repositories (/home/git/repositories/...). www-data (or trac) needs to at least read permissions (i think). and git (or gitolite) needs obviously read/write permissions to push changesets. i tried a little bit around (i.e. adding www-data and/or git to the www-data/git group), but didn't got it right. at least one of the two don't work (git or trac). any suggestions are highly appreciated. regard, klemens

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  • Resizing mysterious partition written by DDing an ISO file

    - by Jon
    I downloaded clonezilla and then wrote it to a USB flash drive with this: dd if=clonezilla.iso of=/dev/sdb I've confirmed that the system boots and clonezilla runs from the flash drive. I want to store a clonezilla backup on the same flash drive clonezilla is running on, but I tried it and ran out of space, so I started looking at how to resize the mysterious partition type that was generated from the ISO. fdisk -l /dev/sdb .... Device Boot Start End Blocks Id System /dev/sdb1 * 1 111 113664 17 Hidden HPFS/NTFS .... I've tried using ntfsresize from the Debian ntfsprogs package. I'm trying gparted next, but thought I'd ask here if anyone knows a neat way to resize a partition created on flash from a liveCD image. Thanks in advance Jon ps. Assume Debian 6 please.

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  • NFS confusion - writing many small files

    - by Antonis Christofides
    I have a Debian squeeze amd64 which is at the same time a NFS4 server and client (it mounts itself through NFS4). The local directory that leads directly to disk is /nfs4exports/mydir, whereas /nfs4mounts/mydir is the same thing mounted through NFS, using the machine's external IP address. Here is the line from fstab: 176.9.116.102:/mydir /nfs4mounts/mydir nfs4 soft 0 0 I have an application that writes many small files. If I write directly to /nfs4exports/mydir, it writes thousands of files per second; but if I write to /nfs4mounts/mydir, it writes 4 files per second or so. I can greatly increase speed if I add async to /etc/exports. (Writing a single large file to the NFS directory goes at more than 100 MB/s.) I am confused by the description of async in NFS. If my application accesses the local directory, system calls like write and close return even if caches have not been flushed to permanent storage. Apparently this is not true with NFS sync behaviour. However, with NFS async behaviour, even calls like fsync are ignored. Isn't it possible to work like local files, i.e. generally work asynchronously, but honour fsync and O_SYNC?

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  • what does the @ symbol mean in ls -l directory listing?

    - by Andrew Arrow
    When I run ls -l on my mac I see two .yml files: -rw-r--r-- 1 aa staff 6 Apr 15 05:50 s1.yml -rw-r--r--@ 1 aa staff 362 Apr 15 05:49 s3.yml same owner, same permissions but one has a @ at the end of the permisions. The one with the @ shows up in my editor, the one without does not. So there must be some significance. How can I turn on the @ for the file without it? I selected the files in the finder and did get info and everything looks identical between the two files.

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