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Quick installation (legacy)

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{{Warning|This document briefly article describes the steps needed to install legacy version of OpenVZ on your (RPM based) machine. For '''Debian''' based systems current version, see [[Installation on DebianQuick 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], [http://forum.openvz.org/index.php?t=tree&amp;goto=1805&amp;#msg_1805 German],[http://wiki.openvz.jp Japanese]steps needed to install '''legacy''' OpenVZ on your '''RHEL 6''' (CentOS 6,[[Quick_installation_(SpanishScientific Linux 6)|Spanish]]machine.
OpenVZ consists of a kernel, user<!--T:2--level tools>For '''Debian''' based systems, and container 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.swsoftvirtuozzo.com/en/products/virtuozzoopenvz/hcl/ Virtuozzo HCL].}}
==Requirements = Filesystems ===It is recommended to use a separate partition for container's private directories (by default /vz/private/<veid>). The reason why you should do so is that if you wish to use OpenVZ per!--container disk quota, you won't be able to use usual Linux disk quotas on the same partition. Bear in mind, that perT:5-container quota in this context includes not only pure per-container quota, but also usual Linux disk quota used in containers, not on [[HN]].>
At least try to avoid using the root partition for containers<!--T:6-->This guide assumes you are running '''RHEL (CentOS, Scientific Linux) 6''' on your system. Currently, because the root user of this is a container will be able recommended platform to overcome the 5% disk space barrier in some situations. This way the HN root partition can be completely filled and it will break the systemrun OpenVZ on.
OpenVZ per=== /vz file system === <!--T:7-container disk quota is supported only for ext2/ext3 filesystems. So use one of these filesystems (ext3 is recommended) if you need per-container disk quota.>
=== rpm or yum? ===<!--T:8-->It is recommended to use a separate partition for containers (by default '''/vz''') and format it to '''ext4'''.
In case you have === yum utility available on your system, you may want to use it effectively to install and update OpenVZ packages. In case you don't have yum, or don't want to use it, you can use plain old rpm. Instructions for both rpm and yum are provided below.pre-setup === <!--T:9-->
=== yum pre<!--T:10--setup ===>If you want Download [https://download.openvz.org/openvz.repo openvz.repo] file and put it to use yum, you should set up OpenVZ your <code>/etc/yum .repos.d/</code> repository first.:
Download [http<!--T://download.openvz.org/openvz.repo openvz.repo] file and put it to your <code11-->/etc/yum.repos.d/</codepre> repository. This can be achieved by the following commands, as root:<prenowiki># cd wget -P /etc/yum.repos.d# wget http/ https://download.openvz.org/openvz.repo# rpm --import http:<//download.openvz.org/RPM-GPG-Key-OpenVZnowiki></pre> In case you can not cd to /etc/yum.repos.d, it means either yum is not installed on your system, or yum version is too old. In that case, just stick to rpm installation method.
== Kernel installation ==<!--T:12-->Import OpenVZ GPG key used for signing RPM packages:
{{Note|In case you want to recompile the kernel yourself rather than use the one provided by <!--T:13--><pre><nowiki>rpm --import http://download.openvz.org/RPM-GPG-Key-OpenVZ, see [[kernel build]].}}</nowiki></pre>
First, To make sure that you need to choose what “flavor” are downloading tamper free versions of the kernel signed packages you want to install. Please refer to should verify the fingerprint of the key you imported into the rpm key database as described on the [[Kernel flavorsPackage signatures]] for more informationpage.
==Kernel installation = Using yum ===Run the following command<pre># yum install ovzkernel[!--T:14--flavor]</pre>
Here <code>[!--flavor]</code> is optional, and can be <code>T:15-smp</code> or <code>-enterprise</code>Limited OpenVZ functionality is supported when you run a recent 3. Refer to x kernel (check [[vzctl for upstream kernel flavors]] for more info, so OpenVZ kernel installation is optional but still recommended.
{{Note|if you need to install <code>x86_64</code> kernel and yum offers to install both <code>x86_64</code> and <code>i686</code> kernels, answer <code>No</code> and specify architecture manually, like this!--T: <code16--># yum install ovzkernel[-flavor].x86_64</code>. This is fixed in newer yum versions.}}vzkernel
==System configuration = Using rpm ===Get the kernel binary RPM from the [[Download/kernel]] page. You only need one kernel RPM so please [[Kernel flavors|choose the appropriate one]] depending on your hardware.<!--T:17-->
Next, install the kernel RPM you chose: <pre># rpm !-ihv ovzkernel[-flavor]*.rpm</pre> Here <code>[T:18-flavor]</code> is optional, and can be <code>-smp</code> or <code>-enterprise</code>. Refer to [[kernel flavors]] for more info. {{Note|<tt>rpm -U</tt> (where <tt>-U</tt> stands for ''upgrade'') should '''not''' be used, otherwise all currently installed kernels will be uninstalledWith vzctl 4.}} == Configuring the bootloader == In case GRUB 4 or newer there is used as the boot loader, it will be configured automatically: lines similar no need to these will be added to the <tt>/boot/grub/grub.conf</tt> file: <pre>title Fedora Core (2.6.8-022stab029.1) root (hd0,0) kernel /vmlinuz-2.6.8-022stab029do manual configuration.1 ro root=/dev/sda5 quiet rhgb vga=0x31B initrd /initrd-2.6.8-022stab029.1.img</pre>Change <tt>Fedora Core</tt> Skip to <tt>OpenVZ</tt> (just for clarity reasons, so the OpenVZ kernels will not be mixed up with non-OpenVZ ones)[[#Tools_installation]]. Remove extra arguments from the kernel line, leaving only the <tt>root=...</tt> parameter. The modifed portion of <tt>/etc/grub.conf</tt> should look like this: <pre>title 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 ==}}
<!--T:19-->
Please make sure the following steps are performed before rebooting into OpenVZ kernel.
=== sysctl ===<!--T:20-->
<!--T:21-->
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.
<!--T:22-->
<pre>
# On Hardware Node we generally need
# packet forwarding enabled and proxy arp disabled
net.ipv4.ip_forward = 1
net.ipv6.conf.default.forwarding = 1
net.ipv6.conf.all.forwarding = 1
net.ipv4.conf.default.proxy_arp = 0
<!--T:23-->
# Enables source route verification
net.ipv4.conf.all.rp_filter = 1
<!--T:24-->
# Enables the magic-sysrq key
kernel.sysrq = 1
<!--T:25-->
# We do not want all our interfaces to send redirects
net.ipv4.conf.default.send_redirects = 1
</pre>
=== SELinux ===<!--T:26-->
<!--T:27-->SELinux should be disabled. To that effect, put the following line Put <code>SELINUX=disabled</code> to <code>/etc/sysconfig/selinux</code>:<pre>SELINUX=disabled</pre>
<!--T:28-->echo "SELINUX=== Conntracks ===disabled" > /etc/sysconfig/selinux
In the stable OpenVZ kernels (those that are 2.6.8== Tools installation == <!-based) netfilter connection tracking for [[CT0]] is disabled by default. If you have a stateful firewall enabled on the host node (it is there by default) you should either disable it, or enable connection tracking for [[CT0]].-T:29-->
To enable conntracks for CT0, add the following line to <code>/etc/modprobe.conf</code> file!--T:<pre30-->options ip_conntrack ip_conntrack_enable_ve0=1</pre> {{NoteOut|In kernels later than 2.6.8, connection tracking is enabled by default.}} == Rebooting into OpenVZ kernel == Now reboot the machine and choose "OpenVZ" on the boot loader menu. If the OpenVZ kernel has been booted successfully, proceed to Before installing the user-level tools for OpenVZ. If you are installing on x86_64 CentOS or Fedora system, you may want to continue the setup process using the please read about [[Install_OpenVZ_on_a_x86_64_system_Centos-Fedora|x86_64 guidevzstats]]. == Installing the utilities == OpenVZ needs some userand opt-level tools installed. Those are: ; vzctl: A utility out if you don't want to control OpenVZ containers (create, destroy, start, stop, set parameters etc.); vzquota: A utility to manage quotas for containers. Mostly used indirectly (by vzctl). === Using yum === <pre># yum install vzctl vzquota</pre> === Using rpm === Download help the binary RPMs of these utilities from [[Download/utils]]project. Install them: <pre># rpm -Uhv vzctl*.rpm vzquota*.rpm</pre>}}
If rpm complains about unresolved dependencies, you'll have to satisfy them first, then repeat the installation.<!--T:31-->OpenVZ needs some user-level tools installed:
When all the tools are installed, start the OpenVZ subsystem. <!--T:32--># yum install vzctl vzquota ploop
== Starting Reboot into OpenVZ ==<!--T:33-->
As root, execute the following command<!--T: <pre34--># /sbin/service vz start</pre>Now reboot the machine and choose "OpenVZ" on the boot loader menu (it should be default choice).
This will load all the needed OpenVZ kernel modules. This script should also start all the containers 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.
== Next steps ==<!--T:37-->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.
OpenVZ is now set up on your machine. To load OpenVZ kernel by default, edit the default line in the /boot/grub/grub.conf file to point to the OpenVZ kernel. For example, if the OpenVZ kernel is the first kernel mentioned in the file, put it as default 0. See man grub.conf for more details.== Next steps == <!--T:38-->
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.
[[Category: Installation]]
[[Category: HOWTO]]
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