{{Warning|This document briefly article describes the steps needed to install legacy version of OpenVZ on your machine.For current version, see [[Quick installation]].}}

<!--T:1-->This document is also available in briefly describes the following languages: [http://forum.openvz.org/index.php?t=tree&amp;goto=35&amp;#msg_35 French]steps needed to install '''legacy''' OpenVZ on your '''RHEL 6''' (CentOS 6, [http://forum.openvz.org/index.php?t=tree&amp;goto=1805&amp;#msg_1805 German]Scientific Linux 6) machine.

OpenVZ consists of a kernel, user<!--T:2--level tools>For '''Debian''' based systems, and VE templates. This guide tells how to install the kernel and the toolsplease see [[Installation on Debian]].

== Requirements ==<!--T:3-->This guide assumes you are running recent release {{Out|A commercial version of Fedora Core (like FC5) or RHEL/CentOS 4. CurrentlyOpenVZ is available, OpenVZ kernel tries to support the same hardware that Red Hat kernels supportwhich simplifies installation with a single disk as well as supports networked installation using PXE boot. For full hardware compatibility listTo learn more about Virtuozzo and request a free trial, please see [httphttps://www.virtuozzo.com/enopenvz/products/virtuozzo/hcl/ Virtuozzo HCL].}}

== Kernel installation Requirements ==<!--T:5-->

{{Note|In case <!--T:6-->This guide assumes you want are running '''RHEL (CentOS, Scientific Linux) 6''' on your system. Currently, this is a recommended platform to recompile the kernel yourself rather than use the one provided by run OpenVZ, see [[kernel build]]on.}}

Get the kernel binary RPM from the [http://openvz.org/download/kernel=== / Download » Kernel] page, or directly from [httpvz file system === <!--T://download.openvz.org/kernel/ download.openvz.org/kernel], or from one of its [[Download mirrors|mirrors]]. You need only one kernel RPM so please [[Kernel flavors|choose the appropriate one] depending on your hardware.7-->

Next, install the kernel RPM you chose<!--T:8-->It is recommended to use a separate partition for containers (by default '''/vz''') and format it to '''ext4'''.

=== yum pre-setup === <!--T:9--> <!--T:10-->Download [https://download.openvz.org/openvz.repo openvz.repo] file and put it to your <code>/etc/yum.repos.d/</code> repository: <!--T:11--><pre><nowiki>wget -P /etc/yum.repos.d/ https://download.openvz.org/openvz.repo</nowiki></pre> <!--T:12-->Import OpenVZ GPG key used for signing RPM packages: <!--T:13--><pre><nowiki>rpm -ihv ovzkernel-name*import http://download.openvz.org/RPM-GPG-Key-OpenVZ</nowiki></pre> To make sure that you are downloading tamper free versions of the signed packages you should verify the fingerprint of the key you imported into the rpmkey database as described on the [[Package signatures]] page. == Kernel installation == </pre!--T:14-->

{{Note|<tt>rpm !--T:15--U</tt> Limited OpenVZ functionality is supported when you run a recent 3.x kernel (where <tt>-U</tt> stands check [[vzctl for ''upgrade'') should not be usedupstream kernel]], otherwise all currently installed kernels will be uninstalledso OpenVZ kernel installation is optional but still recommended.}}

In case GRUB is used as the boot loader, it will be configured automatically== System configuration == <!--T: lines similar to these will be added to the <tt17-->/boot/grub/grub.conf</tt> file:

<pre>title Fedora Core (2.6.8!-022stab029.1) root (hd0,0) kernel /vmlinuz-2.6.8-022stab029.1 ro root=/dev/sda5 quiet rhgb vga=0x31B initrd /initrdT:18-2.6.8-022stab029.1.img</pre>Change <tt>Fedora Core</tt> {{Note|With vzctl 4.4 or newer there is no need to <tt>OpenVZ</tt> (just for clarity reasons, so the OpenVZ kernels will not be mixed up with non OpenVZ ones)do manual configuration. Remove extra arguments from the kernel line, leaving only the <tt>root=...</tt> parameter. The modifed portion of <tt>/etc/grubSkip to [[#Tools_installation]].conf</tt> should look like this:}}

<pre!--T:19-->title Please make sure the following steps are performed before rebooting into OpenVZ (2.6.8-022stab029.1) root (hd0,0) kernel /vmlinuz-2.6.8-022stab029.1 ro root=/dev/sda5 initrd /initrd-2.6.8-022stab029.1.img</pre>

== Configuring = sysctl settings === <!--T:20-->

<!--T:21-->There is 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 is are the relevant part portions of the file; please edit it accordingly.

# TCP Explict Congestion Notification#net.ipv4.tcp_ecn = 0<!--T:25--># we We do not want all our interfaces to send redirects

== Rebooting into OpenVZ kernel =SELinux === <!--T:26-->

Now reboot the machine and choose "OpenVZ" on the boot loader menu<!--T:27-->SELinux should be disabled. If the OpenVZ kernel has been booted successfully, proceed Put <code>SELINUX=disabled</code> to installing the user-level tools for OpenVZ.<code>/etc/sysconfig/selinux</code>:

<!--T:28-->echo "SELINUX== Installing the utilities ==disabled" > /etc/sysconfig/selinux

OpenVZ needs some user== Tools installation == <!-level tools installed. Those are-T:29-->

; vzctl<!--T:30-->: A utility to control OpenVZ VPSs (create, destroy{{Out|Before installing tools, start, stop, set parameters etc.); vzquota: A utility please read about [[vzstats]] and opt-out if you don't want to manage quotas for VPSs. Mostly used indirectly (by vzctl)help the project.}}

Download the binary RPMs of these utilities from [http<!--T://openvz.org/download/utils/ Download » Utils], or directly from [http://download.openvz.org/utils/ download.openvz.org/utils], or from one of its [[Download mirrors|mirrors]]. Install them31-->OpenVZ needs some user-level tools installed:

<pre!--T:32-->rpm -Uhv # yum install vzctl*.rpm vzquota*.rpm</pre>ploop

When all <!--T:34-->Now reboot the tools are installed, start machine and choose "OpenVZ" on the OpenVZ subsystemboot loader menu (it should be default choice). == Starting OpenVZ == As root, execute the following command: <pre>/sbin/service vz start</pre>

This will load all the needed OpenVZ kernel modules. This script should also start all the VPSs marked to be auto== Download OS templates == <!-started on machine boot (there aren't any yet).-T:35-->

During the next reboot<!--T:36-->An OS template is a Linux distribution installed into a containerand then packed into a gzipped tarball. Using such a cache, this script should a new containercan be executed automaticallycreated in a minute.

The next step <!--T:39-->OpenVZ is to prepare the [[OS template]]: please continue now set up on your machine. Follow on to [[OS template cache preparationbasic operations in OpenVZ environment]] document.