{{Warning|This is an unofficial guide, use at your own risk. For an official guide, see [[Quick installation]].}}This quick installation quide assumes you have CentOS 6 64-bit installed with [http://wiki.centos.org/HowTos/Virtualization/OpenVZ SELinux and Firewall disabled], and that the containers will be on the same subnet as the host node.The node's IP is 192.168.1.99/24 and the gateway is 192.168.1.1. The containers will have 192.168.1.101, 192.168.1.102, etc...* Add the OpenVZ yum repo<pre># wget -O /etc/yum.repos.d/openvz.repo http://download.openvz.org/openvz.repo# rpm --import http://download.openvz.org/RPM-GPG-Key-OpenVZ</pre>* Ensure the yum repo points to RHEL6 packages<pre># vi /etc/yum.repos.d/openvz.repo</pre>* Install the OpenVZ kernel and ensure it's the 1st option in grub<pre># yum install vzkernel# vi /boot/grub/menu.lst</pre>* Install the OpenVZ utilities<pre># yum install vzctl vzquota ploop</pre>* Tune /etc/sysctl.conf<pre># vi /etc/sysctl.confnet.ipv4.ip_forward = 1net.ipv4.conf.default.proxy_arp = 0net.ipv4.conf.all.rp_filter = 1kernel.sysrq = 1net.ipv4.conf.default.send_redirects = 1net.ipv4.conf.all.send_redirects = 0net.ipv4.icmp_echo_ignore_broadcasts=1net.ipv4.conf.default.forwarding=1</pre>The last 2 steps are necessary only if you are planning on using '''veth''' containers* Create a vmbr0 bridge and add the host's interface to it<pre># vi /etc/sysconfig/network-scripts/ifcfg-vmbr0 DEVICE="vmbr0"BOOTPROTO="static"IPV6INIT="no"ONBOOT="yes"TYPE="Bridge"DELAY=0IPADDR=192.168.1.99NETMASK=255.255.255.0GATEWAY=192.168.1.1# vi /etc/sysconfig/network-scripts/ifcfg-eth0 DEVICE="eth0"ONBOOT="yes"IPV6INIT="no"TYPE="Ethernet"BRIDGE="vmbr0"</pre>* Create /etc/vz/vznet.conf with the following content. This will automatically add/remove the container's interface to the bridge when you start/stop the container.<pre># vi /etc/vz/vznet.conf #!/bin/bashEXTERNAL_SCRIPT="/usr/sbin/vznetaddbr"</pre>* Done. Reboot== Create a VENET Container ==* Create a CT<pre># vzctl create 101 --ostemplate centos-6-x86_64 --config vswap-1g</pre>* Configure the CT<pre># vzctl set 101 --save --name server101# vzctl set 101 --save --onboot yes# vzctl set 101 --save --hostname server101.example.com# vzctl set 101 --save --ipadd 192.168.1.101# vzctl set 101 --save --searchdomain example.com# vzctl set 101 --save --nameserver 8.8.8.8 --nameserver 8.8.4.4# vzctl set 101 --save --cpus 4# vzctl set 101 --save --ram 8G# vzctl set 101 --save --swap 4G# vzctl set 101 --save --diskspace 100G# vzctl start 101# vzctl exec 101 passwd</pre>* Done. Enjoy your new VENET container== Create a VETH Container ==* Create a CT<pre># vzctl create 102 --ostemplate centos-6-x86_64 --config vswap-1g</pre>* Configure the CT<pre># vzctl set 102 --save --name server102# vzctl set 102 --save --onboot yes# vzctl set 102 --save --hostname server102.example.com# vzctl set 102 --save --netif_add eth0,,,FE:FF:FF:FF:FF:FF# vzctl set 102 --save --searchdomain example.com# vzctl set 102 --save --nameserver 8.8.8.8 --nameserver 8.8.4.4# vzctl set 102 --save --cpus 4# vzctl set 102 --save --ram 8G# vzctl set 102 --save --swap 4G# vzctl set 102 --save --diskspace 100G# vzctl start 102# vzctl exec 102 passwd</pre>FE:FF:FF:FF:FF:FF will ensure a permanent MAC address on the bridge interface.(Linux bridges behave strangely. They use the smallest MAC address of all the attached interfaces. If you add a new interface to the bridge with an even smaller MAC, the MAC of the bridge will change causing network interruption until the switch re-learns the new MAC) * Configure the network of a RHEL-based container <pre># cat << _EOF_ > /vz/root/102/etc/sysconfig/network-scripts/ifcfg-eth0DEVICE="eth0"HOSTNAME="server102"IPV6INIT="no"MTU="1500"TYPE="Ethernet"ONBOOT=yesBOOTPROTO=staticIPADDR=192.168.1.102NETMASK=255.255.255.0GATEWAY=192.168.1.1_EOF_# vzctl exec 102 /etc/init.d/network restart</pre>* Configure the network of a Debian-based container<pre># cat << _EOF_ > /vz/root/102/etc/network/interfacesauto lo eth0iface lo inet loopbackiface eth0 inet static address 192.168.1.102 netmask 255.255.255.0 gateway 192.168.1.1_EOF_# vzctl exec 102 /etc/init.d/networking restart</pre>* Done. Enjoy your new VETH container[[Category: Installation]][[Category: HOWTO]]error