38
edits
Changes
→Checkpointing and restoring a container
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:
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 add-apt-repository ppa:ubuntu-lxc/daily
sudo apt-get update
sudo apt-get update
sudo apt-get install lxc
sudo apt-get install lxc
</pre>
</source>
Next, create a container:
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:
And add the following lines (as above) to its config:
<pre>
<source lang="bash">
cat | sudo tee -a /var/lib/lxc/u1/config << EOF
cat | sudo tee -a /var/lib/lxc/u1/config << EOF
# hax for criu
# 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
lxc.cgroup.devices.deny = c 5:1 rwm
# on older lxc comment the above and uncomment the below
# lxc.console = none
# lxc.tty = 0
# lxc.cgroup.devices.deny = c 5:1 rwm
EOF
EOF
</pre>
</source>
Finally, start, and checkpoint the container:
Finally, start, and checkpoint the container:
<pre>
<source lang="bash">
sudo lxc-start -n u1
sudo lxc-start -n u1
sleep 5s # let the container get to a more interesting state
sleep 5s # let the container get to a more interesting state
sudo lxc-checkpoint -s -D /tmp/checkpoint -n u1
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:
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
sudo lxc-checkpoint -r -D /tmp/checkpoint -n u1
</pre>
</source>
And then, get your container's IP and ssh in:
And then, get your container's IP and ssh in:
<pre>
<source lang="bash">
ssh ubuntu@$(sudo lxc-info -i -H -n u1)
ssh ubuntu@$(sudo lxc-info -i -H -n u1)
</pre>
</source>
== Troubleshooting ==
=== Error (mount.c:805): fusectl isn't empty: 8388625 ===
=== Error (mount.c:805): fusectl isn't empty: 8388625 ===