LXC - Revision history

Ptikhomirov: /* Checkpointing and restoring a container */

2024-07-01T04:33:37Z

Checkpointing and restoring a container

Kir: /* Troubleshooting */ to level2

2016-09-21T19:20:44Z

Troubleshooting: to level2

Kir: use source highlighting

2016-09-21T19:20:12Z

use source highlighting

Kir: /* See also / renamed to / External links */, formatting fix

2016-09-21T19:16:41Z

See also: renamed to External links: , formatting fix

Kir: /* Troubleshooting */ use sub-sections

2016-09-21T19:15:27Z

Troubleshooting: use sub-sections

Kir: added to live migration category

2016-09-08T23:27:18Z

added to live migration category

Sergey Bronnikov: added link to demo

2015-05-28T23:51:35Z

added link to demo

Qian11.zhang: LXC 1.1.0 supprorts the lxc-checkpoint tool through CRIU

2015-03-18T01:25:49Z

LXC 1.1.0 supprorts the lxc-checkpoint tool through CRIU

Tycho Andersen at 15:30, 21 October 2014

2014-10-21T15:30:55Z

Tycho Andersen at 19:05, 19 September 2014

2014-09-19T19:05:54Z

@@ Line 23: / Line 23: @@
 cat | sudo tee -a /var/lib/lxc/u1/config << EOF
 # hax for criu
-lxc.console = none
+lxc.console.path = none
-lxc.tty = 0
+lxc.tty.max = 0
 lxc.cgroup.devices.deny = c 5:1 rwm
 EOF
 </source>

@@ Line 49: / Line 49: @@
 </source>
-===Troubleshooting===
+== Troubleshooting ==
 === Error (mount.c:805): fusectl isn't empty: 8388625 ===

@@ Line 6: / Line 6: @@
 LXC upstream has begun to integrate checkpoint/restore support through the lxc-checkpoint tool. This functionality has been in the recent released version of LXC---LXC 1.1.0 , you can install the LXC 1.1.0 or you can check out the development version on Ubuntu by doing:
-<pre>
+<source lang="bash">
 sudo add-apt-repository ppa:ubuntu-lxc/daily
 sudo apt-get update
 sudo apt-get install lxc
-</pre>
+</source>
 Next, create a container:
-<pre>
+<source lang="bash">
-sudo lxc-create -t ubuntu -n u1 -- -r trusty -a amd64
+ sudo lxc-create -t ubuntu -n u1 -- -r trusty -a amd64
-</pre>
+</source>
 And add the following lines (as above) to its config:
-<pre>
+<source lang="bash">
 cat | sudo tee -a /var/lib/lxc/u1/config << EOF
 # hax for criu
@@ Line 27: / Line 27: @@
 lxc.cgroup.devices.deny = c 5:1 rwm
 EOF
-</pre>
+</source>
 Finally, start, and checkpoint the container:
-<pre>
+<source lang="bash">
 sudo lxc-start -n u1
 sleep 5s  # let the container get to a more interesting state
 sudo lxc-checkpoint -s -D /tmp/checkpoint -n u1
-</pre>
+</source>
 At this point, the container's state is stored in /tmp/checkpoint, and the filesystem is in /var/lib/lxc/u1/rootfs. You can restore the container by doing:
-<pre>
+<source lang="bash">
 sudo lxc-checkpoint -r -D /tmp/checkpoint -n u1
-</pre>
+</source>
 And then, get your container's IP and ssh in:
-<pre>
+<source lang="bash">
 ssh ubuntu@$(sudo lxc-info -i -H -n u1)
-</pre>
+</source>
 ===Troubleshooting===

@@ Line 59: / Line 59: @@
 CRIU doesn't yet support shared mountpoints as LXC does; make sure your rootfs is on a non-shared mount.
-== See also ==
+== External links ==
-* [https://www.youtube.com/watch?v=a9T2gcnQg2k&feature=youtu.be&t=18m8s The New New Thing: Turning Docker Tech into a Full Speed Hypervisor] - Talk of Tycho Andersen with demo of migration LXC container with Doom inside. [https://github.com/tych0/presentations/blob/master/ods2014.md Demo script]
+* [https://www.youtube.com/watch?v=a9T2gcnQg2k&feature=youtu.be&t=18m8s The New New Thing: Turning Docker Tech into a Full Speed Hypervisor] - Talk of Tycho Andersen with demo of migration LXC container with Doom inside
 [[Category: HOWTO]]
 [[Category: Live migration]]

@@ Line 51: / Line 51: @@
 ===Troubleshooting===
-* <pre>Error (mount.c:805): fusectl isn't empty: 8388625.</pre>
+=== Error (mount.c:805): fusectl isn't empty: 8388625 ===
-* <pre>Error (mount.c:517): Mount 58 (master_id: 12 shared_id: 0) has unreachable sharing</pre>
+Dumping of fuse filesystems is currently not supported. Empty the container's <code>/sys/fs/fuse/connections</code> and try again.
-criu doesn't yet support shared mountpoints as lxc does; make sure your rootfs is on a non-shared mount.
 == See also ==

← Older revision		Revision as of 23:27, 8 September 2016
Line 62:		Line 62:

	[[Category: HOWTO]]		[[Category: HOWTO]]
		+	[[Category: Live migration]]

@@ Line 5: / Line 5: @@
 == Checkpointing and restoring a container ==
-LXC upstream has begun to integrate checkpoint/restore support through the lxc-checkpoint tool. Although this functionality is not in any released version of LXC yet, you can check out the development version on Ubuntu by doing:
+LXC upstream has begun to integrate checkpoint/restore support through the lxc-checkpoint tool. This functionality has been in the recent released version of LXC---LXC 1.1.0 , you can install the LXC 1.1.0 or you can check out the development version on Ubuntu by doing:
 <pre>
 sudo add-apt-repository ppa:ubuntu-lxc/daily

← Older revision		Revision as of 15:30, 21 October 2014
Line 51:		Line 51:

	===Troubleshooting===		===Troubleshooting===
−	* <pre>Error (sk-netlink.c:77): The socket has data to read</pre>
−	~~Netlink sockets with pending messages are not supported. Usually if you run the dump again it will succeed.~~

	* <pre>Error (mount.c:805): fusectl isn't empty: 8388625.</pre>		* <pre>Error (mount.c:805): fusectl isn't empty: 8388625.</pre>

@@ Line 1: / Line 1: @@
-This article describes how to perform checkpoint-restore for an LXC container. There are two ways to do this, the first part of the article describes how to dump a container with LXC directly, and the second part describes how to do it using tools under development in LXC upstream.
+== Requirements ==
-== Preparing a Linux Container ==
+You should have built and installed a recent (>= 1.3.1) version of CRIU.
-=== Requirements ===
+== Checkpointing and restoring a container ==
 LXC upstream has begun to integrate checkpoint/restore support through the lxc-checkpoint tool. Although this functionality is not in any released version of LXC yet, you can check out the development version on Ubuntu by doing:
@@ Line 168: / Line 49: @@
 ssh ubuntu@$(sudo lxc-info -i -H -n u1)
 </pre>
 [[Category: HOWTO]]