OpenVZ (Open Virtuozzo) is an operating system-level virtualization technology based on the Linux kernel and operating system. OpenVZ allows a physical server to run multiple isolated operating system instances, called containers, virtual private servers (VPSs), or virtual environments (VEs). OpenVZ is similar to FreeBSD jails and Solaris Containers.
Download the OpenVZ repo.
wget -P /etc/yum.repos.d/ http://ftp.openvz.org/openvz.repo
Import OpenVZ GPG key.
rpm --import http://ftp.openvz.org/RPM-GPG-Key-OpenVZ
Install OpenVZ
yum install -y ovzkernel vzctl vzquota ploop
Modify the /etc/sysctl.conf file
# Enables the kernel magic-sysrq key kernel.sysrq = 1 # Not all the network interfaces should send redirects net.ipv4.conf.default.send_redirects = 1 net.ipv4.conf.all.send_redirects = 0 # Enables source route verification net.ipv4.conf.all.rp_filter = 1 # packet forwarding enabled and proxy arp disabled net.ipv4.ip_forward = 1 net.ipv6.conf.default.forwarding = 1 net.ipv6.conf.all.forwarding = 1 net.ipv4.conf.default.proxy_arp = 0
Set SELinux to permissive mode by modifying /etc/selinux/selinux
sed -i --follow-symlinks 's/\(^SELINUX=\)\(.*\)/permissive/g' /etc/selinux/config setenforce 0
Download a template
cd /vz/template/cache wget http://download.openvz.org/template/precreated/centos-5-x86_64.tar.gz
Reboot to the default OpenVZ kernel.
Create a new container
vzctl create 1001 --ostemplate centos-5-x86_64 # Modify vzctl set 1001 --hostname myhost.my.domain --ipadd 192.168.1.2 --userpasswd root:[newpasswd] --save # Boot with system vzctl set 1001 --onboot yes --save
Start / stop the container
vzctl start 1001 vzctl stop 1001 vzctl stop 1001 --fast
Enter the container
vzctl enter 1001
Run commands from within vzctl
vzctl exec 1001 service sshd status
List containers
vzlist 1001 vzlist -a
Create a computer name
vzctl set 1001 --name computer1 --save vzctl stop computer1
