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This document briefly describes the steps needed to install OpenVZ on your '''RHEL 6''' (CentOS 6, Scientific Linux 6) machine.
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For '''Debian''' based systems, please see [[Installation on Debian]].
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{{Out|A commercial version of OpenVZ is available, which simplifies installation with a single disk as well as supports networked installation using PXE boot. To learn more about Virtuozzo and request a free trial, please see http://www.odin.com/products/virtuozzo/}}
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{{Out|If you want to try a new development version of [[Virtuozzo]] 7, check [[Quick installation of Virtuozzo 7]].}}
== Requirements ==<!--T:5-->
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This guide assumes you are running '''RHEL (CentOS, Scientific Linux) 6''' on your system. Currently, this is a recommended platform to run OpenVZ on.
=== /vz file system ===<!--T:7-->
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It is recommended to use a separate partition for containers (by default '''/vz''') and format it to '''ext4'''.
=== yum pre-setup ===<!--T:9-->
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Download [http://ftp.openvz.org/openvz.repo openvz.repo] file and put it to your <code>/etc/yum.repos.d/</code> repository:
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<pre><nowiki>wget -P /etc/yum.repos.d/ http://ftp.openvz.org/openvz.repo</nowiki></pre>
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Import OpenVZ GPG key used for signing RPM packages:
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<pre><nowiki>rpm --import http://ftp.openvz.org/RPM-GPG-Key-OpenVZ</nowiki></pre>
== Kernel installation ==<!--T:14-->
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Limited OpenVZ functionality is supported when you run a recent 3.x kernel (check [[vzctl for upstream kernel]], so OpenVZ kernel installation is optional but still recommended.
<!--T:16--># yum install vzkernel
== System configuration ==<!--T:17-->
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{{Note|With vzctl 4.4 or newer there is no need to do manual configuration. Skip to [[#Tools_installation]].}}
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Please make sure the following steps are performed before rebooting into OpenVZ kernel.
=== sysctl ===<!--T:20-->
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There are a number of kernel parameters that should be set for OpenVZ to work correctly. These parameters are stored in <tt>/etc/sysctl.conf</tt> file. Here are the relevant portions of the file; please edit accordingly.
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<pre>
# On Hardware Node we generally need
net.ipv4.conf.default.proxy_arp = 0
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# Enables source route verification
net.ipv4.conf.all.rp_filter = 1
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# Enables the magic-sysrq key
kernel.sysrq = 1
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# We do not want all our interfaces to send redirects
net.ipv4.conf.default.send_redirects = 1
</pre>
=== SELinux ===<!--T:26-->
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SELinux should be disabled. Put <code>SELINUX=disabled</code> to <code>/etc/sysconfig/selinux</code>:
<!--T:28-->echo "SELINUX=disabled" > /etc/sysconfig/selinux
== Tools installation ==<!--T:29-->
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{{Out|Before installing tools, please read about [[vzstats]] and opt-out if you don't want to help the project.}}
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OpenVZ needs some user-level tools installed:
<!--T:32--># yum install vzctl vzquota ploop
== Reboot into OpenVZ ==<!--T:33-->
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Now reboot the machine and choose "OpenVZ" on the boot loader menu (it should be default choice).
== Download OS templates ==<!--T:35-->
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An OS template is a Linux distribution installed into a container
and then packed into a gzipped tarball. Using such a cache, a new container
can be created in a minute.
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Download precreated template caches from [http://openvz.org/download/template/cache Downloads » Templates » Precreated], or directly from [http://download.openvz.org/template/precreated/ download.openvz.org/template/precreated], or from one of the [[Download mirrors|mirrors]]. Put those tarballs '''as-is (no unpacking needed)''' to the <tt>/vz/template/cache/</tt> directory.
== Next steps ==<!--T:38-->
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OpenVZ is now set up on your machine. Follow on to [[basic operations in OpenVZ environment]] document.