IT Mission Linux Tips, Hacks, Tutorials, Howtos - Itmission.org

Tue Jun 26 15:43:23 2007 reference linux man pages and openvz.org

OpenVZ is an Operating System-level server virtualization solution, built on Linux. OpenVZ creates isolated, secure virtual environments.

vzctl Commands

Most of the step for installing OpenVz can be found at http://wiki.openvz.org/Quick_installation

After installing your operating system run the following yum update -y; shutdown -r now

Step 1 Downloading and Installing OpenVZ Kernel and utilities

  # cd /etc/yum.repos.d

  # wget http://download.openvz.org/openvz.repo

  # yum install ovzkernel 
  # yum install vzctl vzquota

Step 2 Installing template utilities

yum install vzpkg vzyum vzrpm43-python vzrpm44-python

Step 3 Download Precreated template cache

  #cd /vz/template/cache

  Download Precreated Templates from: http://download.openvz.org/template/precreated/

Most of the quick install steps can be found at http://wiki.openvz.org/Quick_installation
Example Configuration After installing all the needed softwares:

  [root@server1 template]# vzctl create 201 --ostemplate centos-4-i386-default
  Creating VE private area (centos-4-i386-default)
  Performing postcreate actions
  VE private area was created


  [root@server1 template]# vzctl set 201 --ipadd 5.5.8.10 --save
  Saved parameters for VE 201
  [root@server1 template]# vzctl start 201
  Starting VE ...
  VE is mounted
  Adding IP address(es): 5.5.8.10
  Setting CPU units: 1000
  VE start in progress...


  [root@server1 template]# vzctl set 201 --onboot yes --save
  Saved parameters for VE 201


  [root@server1 template]# vzctl set 101 --hostname server1.server1.org --save    syntax mistake made
  Warning: distribution not specified default used /etc/vz/dists/default
  Saved parameters for VE 101


  [root@server1 template]# vzctl set 201 --hostname server1.server1.com  --save
  Set hostname: server1.server1.com
  Saved parameters for VE 201


  [root@server1 template]# vzctl set 201 --nameserver 5.5.8.1 --save
  File resolv.conf was modified
  Saved parameters for VE 201


  [root@server1 template]# vzctl set 201 --nameserver 5.5.8.2 --save
  File resolv.conf was modified
  Saved parameters for VE 201

Here i noted that the nameserver file resolv.conf get overwritten, which needs to be setup later.

  [root@server1 template]# vzctl exec 201 service sshd status
  sshd (pid 10026) is running...


  [root@server1 template]# cd /etc/sysconfig/vz-scripts


  [root@server1 vz-scripts]# ll
  total 28
  -rw-r--r-- 1 root root  228 Mar 13 08:58 0.conf
  -rw-r--r-- 1 root root 1702 May 31 21:35 100.conf.destroyed
  -rw-r--r-- 1 root root   26 Jun 25 12:23 101.conf
  -rw-r--r-- 1 root root 1756 Jun 25 12:26 201.conf
  -rw-r--r-- 1 root root 1703 Jun 15 15:22 202.conf
  -rw-r--r-- 1 root root 1539 Mar 13 08:58 ve-light.conf-sample
  -rw-r--r-- 1 root root 1558 Mar 13 08:58 ve-vps.basic.conf-sample


  [root@server1 vz-scripts]# vzctl set 201 --userpasswd root:;server1    Some problem with ; in passwd
  -bash: !: event not found


  [root@server1 vz-scripts]# vzctl enter 201
  entered into VE 201


  [root@cvps-11 /]# hostname
  server1.server1.com

  [root@server1 /]# passwd root
  Changing password for user root.
  New UNIX password:
  Retype new UNIX password:
  passwd: all authentication tokens updated successfully.

  [root@server1 /]# exit
  logout
  exited from VE 201
  [root@server1 vz-scripts]#

Setup memory for openvz - vzctl set 201 --vmguarpages 512M:600M --save

  [root@server1 template]# vzctl destroy 201
  Destroying VE private area: /vz/private/201
  VE private area was destroyed