Difference between revisions of "Quick installation (legacy)"

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This document briefly describes the steps needed to install OpenVZ on your (RPM based) machine. For '''Debian''' based systems see [[Installation on Debian]].
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{{Warning|This article describes legacy version of OpenVZ. For current version, see [[Quick installation]].}}
  
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This document is also available in the following languages: [http://forum.openvz.org/index.php?t=tree&goto=35&#msg_35 French],  [http://forum.openvz.org/index.php?t=tree&goto=1805&#msg_1805 German],
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<!--T:1-->
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[http://wiki.openvz.jp Japanese],
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This document briefly describes the steps needed to install '''legacy''' OpenVZ on your '''RHEL 6''' (CentOS 6, Scientific Linux 6) machine.
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[[Quick_installation_(Spanish)|Spanish]].
 
  
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OpenVZ consists of a kernel, user-level tools, and container templates. This guide tells how to install the kernel and the tools.
+
<!--T:2-->
 +
For '''Debian''' based systems, please see [[Installation on Debian]].
  
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== Requirements ==
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<!--T:3-->
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This guide assumes you are running recent release of Fedora Core (like FC5) or RHEL/CentOS 4. Currently, OpenVZ kernel tries to support the same hardware that Red Hat kernels support. For full hardware compatibility list, see [http://www.swsoft.com/en/products/virtuozzo/hcl/ Virtuozzo HCL].
+
{{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 https://virtuozzo.com/openvz/}}
  
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=== Filesystems ===
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== Requirements == <!--T:5-->
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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 per-container quota in this context includes not only pure per-container quota, but also usual Linux disk quota used in containers, not on [[HN]].
 
  
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At least try to avoid using the root partition for containers, because the root user of a container will be able 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 system.
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<!--T:6-->
 +
This guide assumes you are running '''RHEL (CentOS, Scientific Linux) 6''' on your system. Currently, this is a recommended platform to run OpenVZ on.
  
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OpenVZ per-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.
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=== /vz file system === <!--T:7-->
  
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=== rpm or yum? ===
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<!--T:8-->
 +
It is recommended to use a separate partition for containers (by default '''/vz''') and format it to '''ext4'''.
  
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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.
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=== yum pre-setup === <!--T:9-->
  
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=== yum pre-setup ===
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<!--T:10-->
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If you want to use yum, you should set up OpenVZ yum repository first.
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Download [https://download.openvz.org/openvz.repo openvz.repo] file and put it to your <code>/etc/yum.repos.d/</code> repository:
  
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Download [http://download.openvz.org/openvz.repo openvz.repo] file and put it to your <code>/etc/yum.repos.d/</code> repository. This can be achieved by the following commands, as root:
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<!--T:11-->
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<pre>
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<pre><nowiki>wget -P /etc/yum.repos.d/ https://download.openvz.org/openvz.repo</nowiki></pre>
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# cd /etc/yum.repos.d
 
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# wget http://download.openvz.org/openvz.repo
 
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# rpm --import  http://download.openvz.org/RPM-GPG-Key-OpenVZ
 
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</pre>
 
−
 
 
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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.
 
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== Kernel installation ==
 
−
 
 
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{{Note|In case you want to recompile the kernel yourself rather than use the one provided by OpenVZ, see [[kernel build]].}}
 
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First, you need to choose what “flavor” of the kernel you want to install. Please refer to [[Kernel flavors]] for more information.
 
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=== Using yum ===
 
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Run the following command
 
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<pre>
 
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# yum install ovzkernel[-flavor]
 
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</pre>
 
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Here <code>[-flavor]</code> is optional, and can be <code>-smp</code> or <code>-enterprise</code>. Refer to [[kernel flavors]] for more info.
 
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'''Note, if you are installing 64bit openvz kernel, install using manually or else yum installs both architectures i686 and x86_64 resulting non booting openvz kernel'''
 
  
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=== Using rpm ===
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<!--T:12-->
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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.
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Import OpenVZ GPG key used for signing RPM packages:
  
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Next, install the kernel RPM you chose:
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<!--T:13-->
 +
<pre><nowiki>rpm --import http://download.openvz.org/RPM-GPG-Key-OpenVZ</nowiki></pre>
  
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<pre>
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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 rpm key database as described on the [[Package signatures]] page.
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# rpm -ihv ovzkernel[-flavor]*.rpm
 
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</pre>
 
  
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Here <code>[-flavor]</code> is optional, and can be <code>-smp</code> or <code>-enterprise</code>. Refer to [[kernel flavors]] for more info.
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== Kernel installation == <!--T:14-->
  
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{{Note|<tt>rpm -U</tt> (where <tt>-U</tt> stands for ''upgrade'') should '''not''' be used, otherwise all currently installed kernels will be uninstalled.}}
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<!--T:15-->
 +
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.
  
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== Configuring the bootloader ==
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<!--T:16-->
 +
# yum install vzkernel
  
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In case GRUB is used as the boot loader, it will be configured automatically: lines similar to these will be added to the <tt>/boot/grub/grub.conf</tt> file:
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== System configuration == <!--T:17-->
  
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<pre>
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<!--T:18-->
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title Fedora Core (2.6.8-022stab029.1)
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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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      root (hd0,0)
 
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      kernel /vmlinuz-2.6.8-022stab029.1 ro root=/dev/sda5 quiet rhgb vga=0x31B
 
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      initrd /initrd-2.6.8-022stab029.1.img
 
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</pre>
 
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Change <tt>Fedora Core</tt> to <tt>OpenVZ</tt> (just for clarity reasons, so the OpenVZ kernels will not be mixed up with non-OpenVZ ones). 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:
 
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<pre>
 
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title OpenVZ (2.6.8-022stab029.1)
 
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        root (hd0,0)
 
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        kernel /vmlinuz-2.6.8-022stab029.1 ro root=/dev/sda5
 
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        initrd /initrd-2.6.8-022stab029.1.img
 
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</pre>
 
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== Configuring ==
 
  
 +
<!--T:19-->
 
Please make sure the following steps are performed before rebooting into OpenVZ kernel.
 
Please make sure the following steps are performed before rebooting into OpenVZ kernel.
  
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=== sysctl ===
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=== 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 is the relevant part of the file; please edit it accordingly.
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<!--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>
 
<pre>
 
# On Hardware Node we generally need
 
# On Hardware Node we generally need
 
# packet forwarding enabled and proxy arp disabled
 
# packet forwarding enabled and proxy arp disabled
 
net.ipv4.ip_forward = 1
 
net.ipv4.ip_forward = 1
 +
net.ipv6.conf.default.forwarding = 1
 +
net.ipv6.conf.all.forwarding = 1
 
net.ipv4.conf.default.proxy_arp = 0
 
net.ipv4.conf.default.proxy_arp = 0
 +
 +
<!--T:23-->
 
# Enables source route verification
 
# Enables source route verification
 
net.ipv4.conf.all.rp_filter = 1
 
net.ipv4.conf.all.rp_filter = 1
 +
 +
<!--T:24-->
 
# Enables the magic-sysrq key
 
# Enables the magic-sysrq key
 
kernel.sysrq = 1
 
kernel.sysrq = 1
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# TCP Explict Congestion Notification
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#net.ipv4.tcp_ecn = 0
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<!--T:25-->
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# we do not want all our interfaces to send redirects
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# We do not want all our interfaces to send redirects
 
net.ipv4.conf.default.send_redirects = 1
 
net.ipv4.conf.default.send_redirects = 1
 
net.ipv4.conf.all.send_redirects = 0
 
net.ipv4.conf.all.send_redirects = 0
 
</pre>
 
</pre>
  
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=== SELinux ===
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=== SELinux === <!--T:26-->
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SELinux should be disabled. To that effect, put the following line to <code>/etc/sysconfig/selinux</code>:
 
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<pre>
 
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SELINUX=disabled
 
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</pre>
 
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=== Conntracks ===
 
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In the stable OpenVZ kernels (those that are 2.6.8-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]].
 
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To enable conntracks for CT0, add the following line to <code>/etc/modprobe.conf</code> file:
 
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<pre>
 
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options ip_conntrack ip_conntrack_enable_ve0=1
 
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</pre>
 
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{{Note|In kernels later than 2.6.8, connection tracking is enabled by default.}}
 
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== Rebooting into OpenVZ kernel ==
 
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Now reboot the machine and choose "OpenVZ" on the boot loader menu. If the OpenVZ kernel has been booted successfully, proceed to 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 [[Install_OpenVZ_on_a_x86_64_system_Centos-Fedora|x86_64 guide]].
 
−
 
 
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== Installing the utilities ==
 
  
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OpenVZ needs some user-level tools installed. Those are:
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<!--T:27-->
 +
SELinux should be disabled. Put <code>SELINUX=disabled</code> to <code>/etc/sysconfig/selinux</code>:
  
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; vzctl
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<!--T:28-->
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:    A utility to control OpenVZ containers (create, destroy, start, stop, set parameters etc.)
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echo "SELINUX=disabled" > /etc/sysconfig/selinux
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; vzquota
 
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:    A utility to manage quotas for containers. Mostly used indirectly (by vzctl).
 
  
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=== Using yum ===
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== Tools installation == <!--T:29-->
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<pre>
 
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# yum install vzctl vzquota
 
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</pre>
 
  
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=== Using rpm ===
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<!--T:30-->
 +
{{Out|Before installing tools, please read about [[vzstats]] and opt-out if you don't want to help the project.}}
  
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Download the binary RPMs of these utilities from [[Download/utils]]. Install them:
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<!--T:31-->
 +
OpenVZ needs some user-level tools installed:
  
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<pre>
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<!--T:32-->
−
# rpm -Uhv vzctl*.rpm vzquota*.rpm
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# yum install vzctl vzquota ploop
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</pre>
 
  
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If rpm complains about unresolved dependencies, you'll have to satisfy them first, then repeat the installation.
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== Reboot into OpenVZ == <!--T:33-->
  
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When all the tools are installed, start the OpenVZ subsystem.
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<!--T:34-->
−
 
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Now reboot the machine and choose "OpenVZ" on the boot loader menu (it should be default choice).
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== Starting OpenVZ ==
 
−
 
 
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As root, execute the following command:
 
−
 
 
−
<pre>
 
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# /sbin/service vz start
 
−
</pre>
 
  
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This will load all the needed OpenVZ kernel modules. This script should also start all the containers marked to be auto-started on machine boot (there aren't any yet).
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== Download OS templates == <!--T:35-->
  
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During the next reboot, this script should be executed automatically.
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<!--T:36-->
 +
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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== Next steps ==
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<!--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.
  
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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.
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== Next steps == <!--T:38-->
  
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The next step is to prepare the [[OS template]]: please continue to [[OS template cache preparation]] document.
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<!--T:39-->
 +
OpenVZ is now set up on your machine. Follow on to [[basic operations in OpenVZ environment]] document.
  
 
[[Category: Installation]]
 
[[Category: Installation]]
 
[[Category: HOWTO]]
 
[[Category: HOWTO]]

Latest revision as of 02:58, 27 November 2018

Warning.svg Warning: This article describes legacy version of OpenVZ. For current version, see Quick installation.

This document briefly describes the steps needed to install legacy OpenVZ on your RHEL 6 (CentOS 6, Scientific Linux 6) machine.

For Debian based systems, please see Installation on Debian.

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 https://virtuozzo.com/openvz/

Requirements[edit]

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[edit]

It is recommended to use a separate partition for containers (by default /vz) and format it to ext4.

yum pre-setup[edit]

Download openvz.repo file and put it to your /etc/yum.repos.d/ repository: 

wget -P /etc/yum.repos.d/ https://download.openvz.org/openvz.repo

Import OpenVZ GPG key used for signing RPM packages: 

rpm --import http://download.openvz.org/RPM-GPG-Key-OpenVZ

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 rpm key database as described on the Package signatures page.

Kernel installation[edit]

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.

  1. yum install vzkernel

System configuration[edit]

Yellowpin.svg Note: With vzctl 4.4 or newer there is no need to do manual configuration. Skip to #Tools_installation.

Please make sure the following steps are performed before rebooting into OpenVZ kernel.

sysctl[edit]

There are a number of kernel parameters that should be set for OpenVZ to work correctly. These parameters are stored in /etc/sysctl.conf file. Here are the relevant portions of the file; please edit accordingly. 

# 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
net.ipv4.conf.all.send_redirects = 0

SELinux[edit]

SELinux should be disabled. Put SELINUX=disabled to /etc/sysconfig/selinux:

echo "SELINUX=disabled" > /etc/sysconfig/selinux

Tools installation[edit]

Before installing tools, please read about vzstats and opt-out if you don't want to help the project.

OpenVZ needs some user-level tools installed:

  1. yum install vzctl vzquota ploop

Reboot into OpenVZ[edit]

Now reboot the machine and choose "OpenVZ" on the boot loader menu (it should be default choice).

Download OS templates[edit]

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.

Download precreated template caches from Downloads » Templates » Precreated, or directly from download.openvz.org/template/precreated, or from one of the mirrors. Put those tarballs as-is (no unpacking needed) to the /vz/template/cache/ directory.

Next steps[edit]

OpenVZ is now set up on your machine. Follow on to basic operations in OpenVZ environment document.

Retrieved from "https://wiki.openvz.org/index.php?title=Quick_installation_(legacy)&oldid=23051"