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→Container Checkpoint/Restore
This article provides an overview of CRIU integration with [https://github.com/opencontainers/runc runc] and explains how to use it.
This article provides an overview of CRIU integration with [https://github.com/opencontainers/runc runc] and explains how to use it.
== Container Checkpoint/Restore ==
Create a container rootfs
<pre>
mkdir -p alpine-container/rootfs && cd alpine-container
wget https://dl-cdn.alpinelinux.org/alpine/latest-stable/releases/x86_64/alpine-minirootfs-3.22.2-x86_64.tar.gz
tar -xzf alpine-minirootfs-3.22.2-x86_64.tar.gz -C rootfs
rm -f alpine-minirootfs-3.22.2-x86_64.tar.gz
</pre>
Create a container specification file:
<pre>
runc spec
</pre>
Set a command to run in the container:
<pre>
sed -i 's/"sh"/"sh", "-c", "i=0; while true; do echo $i; i=$(expr $i + 1); sleep 1; done"/' config.json
</pre>
Start the container and redirect the output/error to <code>looper.out</code> and <code>looper.out</code>:
<pre>
sudo runc run looper 0</dev/null 1>looper.out 2>looper.err &
</pre>
Alternatively, you can disable the interactive terminal and run container in the background as follows:
<pre>
sed -i 's/"terminal": true/"terminal": false/g' config.json
sudo runc run -d looper 0</dev/null 1>/dev/null 2>/dev/null
</pre>
Show running containers
<pre>
sudo runc list
sudo runc state looper
</pre>
Now the container can be checkpointed:
<pre>
mkdir /tmp/checkpoint
sudo runc checkpoint --image-path /tmp/checkpoint --work-path /tmp/checkpoint looper
</pre>
Once the container is checkpointed it will be no longer visible in <code>runc list</code>.
The following command can be used to restore the container:
<pre>
sudo runc restore --image-path /tmp/checkpoint --work-path /tmp/checkpoint looper
</pre>
Show running containers:
<pre>
sudo runc list
sudo runc state looper
</pre>
The following command can be used to terminate the running container:
<pre>
sudo runc kill looper KILL
sudo runc delete looper
</pre>