docker checkpoint checkpoint code example

Example: what is docker checkpoint

$ docker run --security-opt=seccomp:unconfined --name cr -d busybox /bin/sh -c 'i=0; while true; do echo $i; i=$(expr $i + 1); sleep 1; done'
> abc0123

$ docker checkpoint create cr checkpoint1

# <later>
$ docker start --checkpoint checkpoint1 cr
> abc0123