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  1. #1

    make centos image for xen

    now I have been trying to get it to work, but cant get it going...

    how do I make centos run on xen?

  2. #2
    Join Date
    Jun 2008
    Posts
    1,471
    There are some pretty good guides on HowToForge:
    http://www.howtoforge.com/ubuntu-8.0...u-repositories

  3. #3
    Join Date
    Oct 2007
    Location
    Northampton, UK
    Posts
    553
    I wrote a quick guide a while back for getting a dom0/domU running which might be useful - http://sysadminman.net/blog/archives/39

    Matt
    SysAdminMan - Asterisk PBX hosting - FreePBX, A2Billing and Elastix

  4. #4
    Join Date
    Dec 2005
    Location
    Berkshire, UK
    Posts
    3,077
    Or you can save yourself some hassle and get some premade images for Xen from www.jailtime.org

    Note: Root login is disabled by default so you will need to edit /etc/ssh/sshd_config
    System Administrator (RHCE, LFCS, cPPC::Tech)
    PCSmart Group.

  5. #5
    Join Date
    Dec 2001
    Location
    Northern Virginia
    Posts
    238

  6. #6
    Quote Originally Posted by The Universes View Post
    There are some pretty good guides on HowToForge:
    http://www.howtoforge.com/ubuntu-8.0...u-repositories
    thanks for this

  7. #7
    Join Date
    Aug 2004
    Location
    Shanghai
    Posts
    1,449
    Hi,

    I think that using IMAGES is quite a bad way of doing things, when you have all the tools in hands to do NETWORK setup of your domU. What tool? Well, very simple: yum !!!

    Yes, with only few calls, you can ask yum to setup a full operating system using a network repository. Here's our script (that is in open source):

    PHP Code:
       1 #!/bin/bash
       

       3 CACHEDIR
    ="/var/cache/yum"      # where yum caches stuff -- is created as a subdir
       
    4                                # of the destination chroot
       

       6 
    # FIXME perhaps after installation the script can modify the target machine's yum config to point to our Squid proxy
       
    #       or define http_proxy inside the machine.  that would make upgrades for customers much much faster.
       
    # better idea: instead of using a web cache, use a stash on the machine, we rsync the new RPMs into it once it's finished
       
    # we would need a mutex (flock or fcntl based?) that mutially excludes the critical section
      
    10 # the critical section is both the yum and the rsync process
      
    11 # we also need to rsync packages from the stash into the var cache on the vps, and a mutex to lock out if another yum is running, just as in the first scenario
      
    12 # cannot use a symlink because its chrooted for the duration of the process
      
    13 # at any case, the repo names for different distros need to be different, otherwise the caches will clash horribly
      
    14 # FIXME once that is done, we can stop using apt-proxy or apt-cacher
      
    15 # FIXME try to make it for suse, mandriva or any other rpm-based distro
      
    16 
      17 YUMENVIRON
    ="$1"                # where the yum config is generated and deployed
      
    18 INSTALLROOT="$2"               # destination directory / chroot for installation
      
    19 
      20 
    if [ "$INSTALLROOT== "" -! -"$INSTALLROOT-"$YUMENVIRON== "" ] ; then
      21         
    echo "usage: centos-installer /yum/environment (will be created) /destination/directory (must exist)"
      
    22         echo "dest dir MUST BE an absolute path"
      
    23         exit 126
      24 fi
      25 
      26 set 
    -e
      27 set 
    -x
      28 
      29 which rpm 
    >/dev/null 2>&|| { echo "rpm is not installed.  please install rpm." ; exit 124 ; }
      
    30 
      31 
    # sometimes when the RPM database is inconsistent, yum fails but exits with success status
      
    32 # we make sure the db is in good health
      
    33 mkdir -/var/lib/rpm
      34 rpm 
    --rebuilddb
      35 
      36 
    # set distro ver
      
    37 releasever=5
      38 
      39 
    # detect architecture
      
    40 ARCH=`uname -m`
      
    41 if [ "$ARCH== x86_64 ] ; then
      42         exclude
    ="*.i386 *.i586 *.i686"
      
    43         basearch=x86_64
      44 elif 
    "$ARCH== i686 ] ; then
      45         exclude
    ="*.x86_64"
      
    46         basearch=i386
      47 
    else
      
    48         echo "Unknown architecture: $ARCH -- stopping centos-installer"
      
    49         exit 3
      50 fi
      51 
      52 
    # make yum environment
      
    53 
      54 mkdir 
    -"$YUMENVIRON"/{pluginconf.d,repos.d"$CACHEDIR" "$INSTALLROOT/var/log"
      
    55 
      56 
    # In case the folder is not there:
      
    57 mkdir -/var/lib/rpm
      58 
      59 
    # configure yum:
      
    60 
      61 cat 
    "$YUMENVIRON/yum.conf" << EOF
      62 
    [main]
      
    63 reposdir=$YUMENVIRON/repos.d
      64 pluginconfpath
    =$YUMENVIRON/pluginconf.d
      65 cachedir
    =$CACHEDIR
      66 installroot
    =$INSTALLROOT
      67 exclude
    =$exclude
      68 keepcache
    =1
      69 
    #debuglevel=4
      
    70 #errorlevel=4
      
    71 pkgpolicy=newest
      72 distroverpkg
    =centos-release
      73 tolerant
    =1
      74 exactarch
    =1
      75 obsoletes
    =1
      76 gpgcheck
    =1
      77 plugins
    =1
      78 metadata_expire
    =1800
      79 EOF
      80 
      81 cat 
    "$YUMENVIRON/pluginconf.d/installonlyn.conf" << EOF
      82 
    [main]
      
    83 enabled=1
      84 tokeep
    =5
      85 EOF
      86 
      87 cat 
    "$YUMENVIRON/repos.d/CentOS-Base.repo" << EOF
      88 
    [base]
      
    89 name=CentOS-Base
      90 
    #baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/
      
    91 mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os
      
    92 gpgcheck=1
      93 gpgkey
    =http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5
      
    94 
      95 
    [updates]
      
    96 name=CentOS-Updates
      97 
    #baseurl=http://mirror.centos.org/centos/$releasever/updates/$basearch/
      
    98 mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates
      
    99 gpgcheck=1
     100 gpgkey
    =http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5
     
    101 
     102 
    [addons]
     
    103 name=CentOS-Addons
     104 
    #baseurl=http://mirror.centos.org/centos/$releasever/addons/$basearch/
     
    105 mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=addons
     
    106 gpgcheck=1
     107 gpgkey
    =http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5
     
    108 
     109 
    [extras]
     
    110 name=CentOS-Extras
     111 
    #baseurl=http://mirror.centos.org/centos/$releasever/extras/$basearch/
     
    112 mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras
     
    113 gpgcheck=1
     114 gpgkey
    =http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5
     
    115 
     116 
    [centosplus]
     
    117 name=CentOS-Plus
     118 
    #baseurl=http://mirror.centos.org/centos/$releasever/centosplus/$basearch/
     
    119 mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus
     
    120 gpgcheck=1
     121 gpgkey
    =http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5
     
    122 EOF
     123 
     124 
    # unleash yum
     
    125 
     126 export LANG
    =C
     127 exec yum 
    -"$YUMENVIRON/yum.conf" -y install basesystem centos-release yum wget 
    This comes directly from the Git of our open source project dtc-xen. We use that script in a Debian dom0, and it's performing quite ok if there are no network problems (very rarely the case, and anyway, yum can try another mirror if the first one fails).

    I just hope that moderators wont have the silly idea to report as self-promotion when I'm just helping somebody...

    Thomas
    GPLHost:>_ open source hosting worldwide (I'm founder, CEO & official Debian Developer)
    Servers & our leading control panel and our Xen VPS hosting, which are already included in Debian and Ubuntu
    Available in: Kuala Lumpur, Singapore, Sydney, Seattle, Atlanta, Paris, London, Barcelona, Zurich, Israel

  8. #8
    #7 looks good. the only reason I wanted to use images was to have a local copy to not use so much bandthwith

  9. #9
    Join Date
    Aug 2004
    Location
    Shanghai
    Posts
    1,449
    Yes, and with a proxy, it's as fast as if it was in local, and things will be downloaded ONCE and for all...

    Thomas
    GPLHost:>_ open source hosting worldwide (I'm founder, CEO & official Debian Developer)
    Servers & our leading control panel and our Xen VPS hosting, which are already included in Debian and Ubuntu
    Available in: Kuala Lumpur, Singapore, Sydney, Seattle, Atlanta, Paris, London, Barcelona, Zurich, Israel

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