OpenVZ (Open Virtuozzo) is a Linux kernel, modified to add support to OpenVZ containers. It provides operating system-level virtualization which allows a physical server to run multiple isolated operating system instances, virtual private servers, and virtual environments.
It uses the same kernel as the host so consumes fewer resources than other virtualization solutions like VMware, KVM, VirtualBox, etc. Since it uses the same kernel as the host so you can only have Linux VPSs on a Linux host.
In this article, I will discuss how to install OpenVZ in Fedora.
Features of OpenVZ
The key features of OpenVZ are –
- Easy to install and setup OpenVZ
- Comparatively uses fewer resources
- It can be used to set up multiple servers with different security configuration
- VPN connections are possible by means of network tunneling
- Resource Management i.e. Two-Level Disk Quota, Fair CPU scheduler, I/O scheduler, User Beancounters
- Checkpointing and live migration
How to install OpenVZ in Fedora
Follow the given steps to install OpenVZ in a Fedora system.
Add OpenVZ repository
To install OpenVZ on your system you need to add its repository. Now use the following commands to add OpenVZ repository –
sudo wget http://download.openvz.org/openvz.repo
sudo rpm --import http://download.openvz.org/RPM-GPG-Key-OpenVZ
Next, open the
openvz.repo file by using –
sudo nano openvz.repo
Scroll it and disable the
[openvz-kernel-rhel5] repository (
enabled=0) and enable the
[openvz-kernel-rhel6] repository instead (
Install OpenVZ kernel
This repository has different OpenVZ kernels pick one of them and install it on your system.
sudo yum install vzkernel
Now kernel should get installed and automatically updated in the GRUB bootloader menu as well.
Setup OpenVZ kernel parameters
sysctl.conf file by using the given command –
sudo nano sysctl.conf
And add the following kernel parameters –
# On a hardware node we generally need # 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 # Enables source route verification net.ipv4.conf.all.rp_filter = 1 # Enables the magic-sysrq key kernel.sysrq = 1 # We do not want all our interfaces to send redirects net.ipv4.conf.default.send_redirects = 1 net.ipv4.conf.all.send_redirects = 0
As you can see in the image below –
Use the following command to edit SELinux configuration and disable it –
sudo nano /etc/sysconfig/selinux
And set –
Install OpenVZ user tools
Use the following command to install the tool required to monitor the usage.
sudo yum install vzctl vzquota ploop
Login to OpenVZ kernel
You have successfully installed the OpenVZ kernel on your system now it’s time to reboot and log in to it. While booting select OpenVZ in the grub menu and press enter to boot into OpenVZ kernel.
Now while creating VMs ensure that you have the same subnet on both physical and virtual machines. If both are different you need to edit the
sudo nano /etc/vz/vz.conf
Find the given line –
Change it to –
Ok, I hope you have successfully set up OpenVZ on your system. Now if you have a question then write us in the comments below.