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Add lxc-checkpoint
This article describes how to perform checkpoint-restore for an LXC container.
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.
== Preparing a Linux Container ==
== Preparing a Linux Container ==
... doesn't have a proper root mount
... doesn't have a proper root mount
consider using the <code>--ext-mount-map</code> option
consider using the <code>--ext-mount-map</code> option
== Using LXC Upstream tools ==
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:
<pre>
sudo add-apt-repository ppa:ubuntu-lxc/daily
sudo apt-get update
sudo apt-get install lxc
</pre>
Next, create a container:
<pre>
sudo lxc-create -t ubuntu -n u1 -- -r trusty -a amd64
</pre>
And add the following lines (as above) to its config:
<pre>
cat | sudo tee -a /var/lib/lxc/u1/config << EOF
# hax for criu
lxc.console = none
lxc.tty = 0
lxc.cgroup.devices.deny = c 5:1 rwm
EOF
</pre>
Finally, start, and checkpoint the container:
<pre>
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>
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>
sudo lxc-checkpoint -r -D /tmp/checkpoint -n u1
</pre>
And then, get your container's IP and ssh in:
<pre>
ssh ubuntu@$(sudo lxc-info -i -H -n u1)
</pre>
[[Category: HOWTO]]
[[Category: HOWTO]]