Editing Installation on Debian 8

This is a guide to install OpenVZ 6 (legacy) on your [https://en.wikipedia.org/wiki/Devuan Devuan 1 "Jessie"] or Debian 8 "Jessie" machine (both amd64 or i386).

{{Out|Current commercial version of OpenVZ ([[Virtuozzo]] 7) is not installable on Devuan or Debian because is developed as an independent GNU/Linux distribution}}

= '''Volumes and file systems''' =

* It is recommended to use a separate partition for containers (by default '''/var/lib/vz''') and format it to '''ext4'''.
* btrfs mounted filesystems cannot be formatted with modern features as: mixed-bg, extref, skinny-metadata, no-holes ([[Installation on Debian 9#btrfs|More details]]).

= '''Change Systemd to SystemV''' =
'''Only needed for Debian''' (Devuan already works with SystemV by default). '''Warning:''' This operation can make some desktop software to stop working.

 sudo apt-get install sysvinit-core sysvinit-utils
 # Must boot with SystemV to release Systemd
 sudo reboot
 sudo apt-get remove systemd
 sudo apt-get autoremove
 echo -e 'Package: *systemd*\nPin: release *\nPin-Priority: -1\n' | sudo tee /etc/apt/preferences.d/avoid-systemd

* More recipes at [http://without-systemd.org/wiki/index.php/How_to_remove_systemd_from_a_Debian_jessie/sid_installation without-systemd.org]

= '''Register OVZ updated repository''' =

 RepoFile=/etc/apt/sources.list.d/openvz.list
 RepoUrl=http://download.openvz.org/debian
 echo "deb $RepoUrl jessie main" | sudo tee "$RepoFile"
 echo "#deb $RepoUrl jessie-test main" | sudo tee -a "$RepoFile"
 echo "deb $RepoUrl wheezy main" | sudo tee -a "$RepoFile"
 wget -qO - http://ftp.openvz.org/debian/archive.key | sudo apt-key add -
 sudo apt-get update

{{Note|The second line with jessie-test is commented out. This is a testing repo with newer kernels and possibly tools. Enable it if you want to stay on a bleeding edge of technology.}}
For more info about Debian repositories, see http://download.openvz.org/debian

= '''Install packages''' =

 KPackage="linux-image-openvz-$(dpkg --print-architecture)"
 sudo apt-get --install-recommends install $KPackage vzdump ploop initramfs-tools
 if [ ! -d /vz ] ; then sudo ln -s /var/lib/vz/ /vz ; fi

* Create file /etc/vz/vznet.conf with the following line:
 EXTERNAL_SCRIPT="/usr/sbin/vznetaddbr"
* Optionally you can set containers completely stop when service stops at /etc/vz/vz.conf
 VE_STOP_MODE=stop

== Patch VarLock directory creation ==
This is necessary to vzeventd works on boot, because it doesn't automatically create VARLOCK directory on startup:
 Lines="$(cat /etc/init.d/vzeventd | grep -e '#.*INIT INFO' -ie '# .*Provides:' -ie '^# .*-St')"
 Lines="$(echo "$Lines" | sed -e 's|vzeventd$|vzevent_pre|g' | sed -e 's| vz$| vzeventd|g')"
 echo "$Lines" | sudo tee /etc/init.d/vzevent_pre
 echo 'mkdir -p /var/lock/subsys' | sudo tee -a /etc/init.d/vzevent_pre
 sudo chmod +x /etc/init.d/vzevent_pre
 sudo insserv --default vzevent_pre

= '''Reboot into OpenVZ kernel''' =

{{Note|At boot manager, in "Advanced options for Devuan GNU+Linux", you will find kernels named "2.6.32-openvz". Select the first listed.}}

 sudo reboot

Check the OpenVZ processes are running:
 sudo ps ax | grep -v 'grep' | grep 'vzmond'

== Set OpenVZ as default to boot ==

Because of GRUB2 default criteria, default kernel to boot can still be the one from Devuan's repository (non OVZ). Probably you don't want this behaviour; once you've booted fine into OpenVZ kernel, you can remove other unuseful kernels:

 Packages="$(aptitude search ~i~nlinux-image- --display-format '%p' | grep -ve 'openvz')"
 sudo apt-get remove $Packages
 sudo apt-get autoremove

(requires aptitude)

= Download OS templates =

This step is optional, vzctl is able to download templates on demand.

An OS template is a GNU distribution for Linux, installed into a container
and then packed into a gzipped tarball. Using such a cache, a new container
can be created in a minute.

 OpenvzKey="$(echo $(sudo gpg --batch --search-keys security@openvz.org 2>&1 | grep -ie ' key.*created' | sed -e 's|key|@|g' | cut -f 2 -d '@') | cut -f 1 -d ' ' | cut -f 1 -d ',')"
 sudo gpg --recv-keys $OpenvzKey
 sudo vztmpl-dl --gpg-check --list-remote
 # Example:
 sudo vztmpl-dl --gpg-check debian-8.0-x86_64-minimal

Alternatively, you can also download precreated template caches from [[Download/template/precreated|Download » Template » Precreated]], or from one of the [https://mirrors.openvz.org/ mirrors]. Put those tarballs '''as-is (no unpacking needed)''' to the <tt>/vz/template/cache/</tt> directory.

= Next steps =

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

= See also =
* [[Installation on Debian 7]] very-old-stable (Wheezy, SystemV by default)
* [[Installation on Debian 9]]

[[Category: Installation]]
[[Category: HOWTO]]
[[Category: Debian]]
[[Category: Devuan]]