Docker inside CT - Revision history

Finist at 06:55, 22 May 2017

2017-05-22T06:55:30Z

2017-05-22T06:30:12Z

‎Limitations

2016-08-15T16:43:40Z

‎Prepare Docker in container

2016-07-18T20:51:04Z

2016-05-20T13:30:21Z

‎Prepare Docker in container

2015-10-13T13:56:14Z

added category

2015-09-21T03:00:52Z

mv video to see also

2015-09-20T13:52:33Z

2015-07-13T16:23:13Z

‎Container creation and tuning: debian wheezy example from Kir reply

2015-04-24T23:01:27Z

‎Container tuning: +diskspace

@@ Line 62: / Line 62: @@
 * [[Checkpointing and live migration]] of a container with Docker containers inside is not supported
 * Bridges cannot be created inside Docker containers running inside OpenVZ container
-* Only works with docker versions 1.10 or older. Newer versions will return an error: "Your Linux kernel version 2.6.32-042stab123.2 is not supported for running docker. Please upgrade your kernel to 3.10.0 or newer."
+* Only works with docker versions 1.10 or older. Newer versions will return an error: "Your Linux kernel version 2.6.32-042stab123.2 is not supported for running docker. Please upgrade your kernel to 3.10.0 or newer." (i.e. switch to [[Quick_installation|Virtuozzo 7]] or later)
 == See also ==

@@ Line 62: / Line 62: @@
 * [[Checkpointing and live migration]] of a container with Docker containers inside is not supported
 * Bridges cannot be created inside Docker containers running inside OpenVZ container
 == See also ==

@@ Line 39: / Line 39: @@
   yum -y install docker-io
 * Start docker daemon
-  docker -d -s vfs
+  dockerd -s vfs
 or change line in /etc/sysconfig/docker to:
   OPTIONS='--selinux-enabled -s vfs'

← Older revision		Revision as of 20:51, 18 July 2016
Line 1:		Line 1:
	Since OpenVZ kernel [[Download/kernel/rhel6-testing/042stab105.4\|042stab105.4]] it is possible to run Docker inside containers. This article describes how.		Since OpenVZ kernel [[Download/kernel/rhel6-testing/042stab105.4\|042stab105.4]] it is possible to run Docker inside containers. This article describes how.
		+	<br>'''This page is applicable for OpenVZ 6''' (for Virtuozzo 7 see [[Docker inside CT vz7\| '''here''']]).

	== Prerequisites ==		== Prerequisites ==

@@ Line 39: / Line 39: @@
 * Start docker daemon
   docker -d -s vfs
 == Example usage ==

@@ Line 1: / Line 1: @@
-Since OpenVZ kernel [[Download/kernel/rhel6-testing/042stab105.4|042stab105.4]] it is possible to run Docker inside containers. This article describes how or see [http://www.youtube.com/watch?v=rh4oPpLtdYc demo video].
+Since OpenVZ kernel [[Download/kernel/rhel6-testing/042stab105.4|042stab105.4]] it is possible to run Docker inside containers. This article describes how.
 == Prerequisites ==
@@ Line 57: / Line 57: @@
 * [[Checkpointing and live migration]] of a container with Docker containers inside is not supported
 * Bridges cannot be created inside Docker containers running inside OpenVZ container
 [[Category:HOWTO]]

@@ Line 23: / Line 23: @@
 * Start the container:
   vzctl start $veid
 == Prepare Docker in container ==

@@ Line 5: / Line 5: @@
 * Kernel modules '''tun''', '''veth''' and '''bridge''' loaded on host (not required since vzctl 4.9 as it loads it automatically)
-== Container tuning ==
+== Container creation and tuning ==
-* Create CentOS 7 container:
+* Create CentOS 7 container with enough disk space:
-  vzctl create $veid --ostemplate centos-7-x86_64
+  vzctl create $veid --ostemplate centos-7-x86_64 --diskspace 20G
 * Turn on bridge feature to allow docker creating bridged network:
   vzctl set $veid --features bridge:on --save
@@ Line 20: / Line 20: @@
 : <small>''systemd reads /proc/cgroups and mounts all cgroups enabled there, though it doesn't know there's a restriction that only freezer,devices and cpuacct,cpu,cpuset can be mounted in container, but not freezer, cpu etc. separately''</small>
   vzctl mount $veid
   echo "JoinControllers=cpu,cpuacct,cpuset freezer,devices" >> /vz/root/$veid/etc/systemd/system.conf
 * Start the container:
   vzctl start $veid