How To Setup OpenVZ under RHEL / CentOS Linux

OpenVZ is a container-based virtualization solution that allows you to create and manage multiple virtual environments on a single physical server. Here are the steps to set up OpenVZ under RHEL / CentOS Linux:

1. Install the OpenVZ kernel and tools:

# yum install vzkernel vzctl vzquota

1. Edit the /etc/sysctl.conf file and add the following lines to the end of the file:

net.ipv4.ip_forward = 1
net.ipv6.conf.default.forwarding = 1
net.ipv6.conf.all.forwarding = 1

1. Reload the sysctl settings:

# sysctl -p

1. Reboot the server to load the new kernel.
2. Create a new virtual machine:

# vzctl create <vmid> --ostemplate <template>

Replace <vmid> with a unique ID for the virtual machine, and <template> with the name of the OpenVZ template to use.

1. Start the virtual machine:

# vzctl start <vmid>

1. Enter the virtual machine:

# vzctl enter <vmid>

1. Configure the virtual machine as you would a physical server, installing and configuring any software or services that you need.
2. Exit the virtual machine:

# exit

1. Stop the virtual machine:

# vzctl stop <vmid>

You can repeat steps 5-10 to create and manage additional virtual machines. OpenVZ also provides a variety of tools and commands for managing virtual environments, such as vzlist to list all running virtual machines, vzctl status <vmid> to check the status of a virtual machine, and vzctl destroy <vmid> to delete a virtual machine. You can refer to the OpenVZ documentation for more information on how to use these tools and commands.