How to Install OpenVZ 7 on CentOS 7

Introduction

OpenVZ is an operating-system-level virtualization technology for Linux. It allows a physical server to run multiple isolated operating system instances, called containers, virtual private servers, or virtual environments

Prerequisite

Hardware specification

Intel Core i7, Xeon E7, and AMD Opteron

A minimum of 128 MB of RAM; 2 GB or more is recommended

A hard drive with at least 80 GB of space

A 10/100/1000 network card

Network specifications

A valid IP address for the server

A valid IP address for each container

Implementation

Step 1: Update and upgrade the depencies

 yum update && yum upgrade

Step 2: Get OpenVZ releases

yum -y localinstall https://download.openvz.org/virtuozzo/releases/openvz-7.0.17-347/x86_64/os/Packages/p/python-subprocess32-3.2.7-1.vz7.5.x86_64.rpm
 
yum -y localinstall https://download.openvz.org/virtuozzo/releases/openvz-7.0.15-628/x86_64/os/Packages/o/openvz-release-7.0.15-4.vz7.x86_64.rpm   

yum -y install epel-release

Step 3: Install the Openvz releases

yum install python3

rpm -Uvh http://repo.virtuozzo.com/vzlinux/7.9/x86_64/os/Packages/r/readykernel-scan-0.11-1.vl7.noarch.rpm

rpm -Uvh http://repo.virtuozzo.com/vzlinux/7.9/x86_64/os/Packages/z/zstd-1.4.4-1.vl7.x86_64.rpm

rpm -Uvh http://repo.virtuozzo.com/vzlinux/7.9/x86_64/os/Packages/v/vzlinux-release-7-1.vl7.91.x86_64.rpm

Step 4: Cleanup the CentOS repository

mv /etc/yum.repos.d/CentOS-* /root/

rpm -e --nodeps --justdb json-c

yum -y erase jansson

yum -y localinstall http://repo.virtuozzo.com/vzlinux/7.9/x86_64/os/Packages/j/jansson-2.10-1.vl7.1.x86_64.rpm

yum -y localinstall http://repo.virtuozzo.com/vzlinux/7.9/x86_64/os/Packages/j/json-c-0.11-13.vl7.1.x86_64.rpm

rpm -e --nodeps --justdb nspr nss nss-pem nss-softokn nss-softokn-freebl nss-sysinit nss-tools nss-util

yum -y localinstall http://repo.virtuozzo.com/vzlinux/7.9/x86_64/os/Packages/n/nss-3.67.0-4.vl7.x86_64.rpm

Step 5: Install OpenVZ kernel

yum -y install nss-softokn-freebl.i686 nss-tools

yum -y install prlctl prl-disp-service vzkernel *ploop*

yum -y update

Note:
(i) If we have architecture error as per the snapshot while installing the vzkernel, downgrade the glib and glibcc version then install the 32 bit dependencies

yum -y downgrade glibc glibc-common

yum -y install glibc.i686 ncurses-libs.i686

(ii) To resolve the xz-libs architecture issue

wget http://mirror.centos.org/centos/7/os/x86_64/Packages/xz-libs-5.2.2-1.el7.i686.rpm

yum install yum-utils

yumdownloader xz-libs-5.2.2

Step 6: Check grub and steup Virtuozzo 7

# awk -F\' '$1=="menuentry " {print i++ " : " $2}' /etc/grub2.cfg

0 : Virtuozzo 7 (3.10.0-1160.42.2.vz7.184.10)

1 : CentOS Linux (3.10.0-1160.53.1.el7.x86_64) 7 (Core)

2 : CentOS Linux (0-rescue-6a03f95fe90f43b786afa291f08bbbf6) 7 (Core)

grub2-editenv list

saved_entry=Virtuozzo 7 (3.10.0-1160.42.2.vz7.184.10)

Step 7: Reboot the server

reboot

Step 8: Setup the initial settings

modprobe ploop pfmt_ploop1 pfmt_raw pio_direct

Step 9: Install quota tools

yum -y install vzctl vzquota ploop

Note:

(i) If we vzquota package is not available, downlaode it and configure manually

Wget http://download.openvz.org/utils/vzquota/3.1/src/vzquota-3.1.tar.bz2

mv vzquot to /usr/libecx/vz

Step 10: Install all available Linux Distro templates

yum -y install *ez.noarch

Step 11: Reboot the server

 reboot

Ref. Links

https://phurix.co.uk/support/faq/how-to-install-openvz-7-on-centos-7/

https://wiki.openvz.org/Download/vzquota/3.1

https://www.linuxquestions.org/questions/linux-newbie-8/yum-dependencies-resolution-fail-glibc-common-4175582316/

https://centos.pkgs.org/7/centos-x86_64/xz-libs-5.2.2-1.el7.i686.rpm.html