Install Kernel for OpenVZ

  This section is the virtualization with OpenVZ. 

[1] Install Kernel for OpenVZ first and reboot system with it.
[root@ns ~]# cd /etc/yum.repos.d
[root@ns yum.repos.d]# wget http://download.openvz.org/openvz.repo
[root@ns yum.repos.d]# cd
[root@ns ~]# yum -y install ovzkernel
Loading "installonlyn" plugin
Loading "fastestmirror" plugin
Setting up Install Process
Setting up repositories
openvz-kernel-rhel5 100% |=========================|  951 B 00:00
openvz-utils 100% |=========================|951 B 00:00
Loading mirror speeds from cached hostfile
Reading repository metadata in from local files
primary.xml.gz 100% |=========================| 31 kB 00:00
openvz-ker: ######################################### 14/14
Added 14 new packages, deleted 0 old in 0.26 seconds
primary.xml.gz 100% |=========================| 5.3 kB 00:00
openvz-uti: ######################################### 21/21
Added 21 new packages, deleted 0 old in 0.13 seconds
Parsing package install arguments
Resolving Dependencies
--> Populating transaction set with selected packages. Please wait.
---> Downloading header for ovzkernel to pack into transaction set.
ovzkernel-2.6.18-8.el5.02 100% |====================| 255 kB 00:00
---> Package Package ovzkernel.i686 0:2.6.18-8.el5.028stab031.1 set to be installed
--> Running transaction check

Dependencies Resolved

===================================================================
Package Arch Version Repository Size
===================================================================
Installing:
  ovzkernel i686 2.6.18-8.el5.
028stab031.1 openvz-kernel
-rhel5   15 M

Transaction Summary
===================================================================
Install 1 Package(s)
Update 0 Package(s)
Remove 0 Package(s)

Total download size: 15 M
Downloading Packages:
(1/1): ovzkernel-2.6.18-8 100% |====================| 15 MB 00:38
Running Transaction Test
Finished Transaction Test
Transaction Test Succeeded
Running Transaction
  Installing:   ovzkernel#################################### [1/1]

Installed: ovzkernel.i686 0:2.6.18-8.el5.028stab031.1
Complete!
[root@ns ~]#
[root@ns ~]# vi /etc/sysctl.conf

# line 7: change
net.ipv4.ip_forward = 1

# line 16: change
kernel.sysrq = 1

# add at the bottom
net.ipv4.conf.default.proxy_arp = 0
net.ipv4.conf.default.send_redirects = 1
net.ipv4.conf.all.send_redirects = 0

[root@ns ~]# vi /boot/grub/grub.conf

# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE: You have a /boot partition. This means that
#all kernel and initrd paths are relative to /boot/, eg.
#root (hd0,0)
#kernel /vmlinuz-version ro root=/dev/Host/LogVol01
#initrd /initrd-version.img
#boot=/dev/sda
# change default kernel
default=0
timeout=5
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title CentOS (2.6.18-8.el5.028stab031.1)
root (hd0,0)
kernel /vmlinuz-2.6.18-8.el5.028stab031.1 ro root=/dev/VZ/Host00 console=tty0
initrd /initrd-2.6.18-8.el5.028stab031.1.img
title CentOS (2.6.18-8.1.4.el5xen)
root (hd0,0)
kernel /xen.gz-2.6.18-8.1.4.el5 dom0_mem=512M
module /vmlinuz-2.6.18-8.1.4.el5xen ro root=/dev/Xen/Host00
module /initrd-2.6.18-8.1.4.el5xen.img
title CentOS (2.6.18-8.1.1.el5)
root (hd0,0)
kernel /vmlinuz-2.6.18-8.1.1.el5 ro root=/dev/Xen/Host00
initrd /initrd-2.6.18-8.1.1.el5.img
title CentOS (2.6.18-8.el5)
root (hd0,0)
kernel /vmlinuz-2.6.18-8.el5 ro root=/dev/Xen/Host00
initrd /initrd-2.6.18-8.el5.img

[root@ns ~]# shutdown -r now

[root@ns ~]# uname -r
2.6.18-8.el5.028stab031.1# OpenVZ kerne

From (server-world)