[root@oegw1 soft]# docker ps
CONTAINER ID    IMAGE        COMMAND        CREATED       STATUS       PORTS        NAMES
8d418a7b6021    postgres      "/docker-entrypoint.  7 hours ago     Up 7 hours               test1  
[root@oegw1 soft]# docker exec -t -i 8d418a7b6021 /bin/bash
root@oegw1:/var/lib/postgresql# pwd
/var/lib/postgresql
root@oegw1:/var/lib/postgresql# ls
data
root@oegw1:/var/lib/postgresql# exit
exit
[root@oegw1 soft]# docker cp 8d418a7b6021:/var/lib/postgresql/data /opt/soft/

docker run -v /opt/soft:/mnt 8d418a7b6021

[root@oegw1 soft]# docker run -it -v /opt/soft:/mnt postgres /bin/bash

[root@oegw1 soft]# docker ps
CONTAINER ID    IMAGE        COMMAND        CREATED       STATUS       PORTS        NAMES
8d418a7b6021    postgres      "/docker-entrypoint.  8 hours ago     Up 8 hours               test1        
[root@oegw1 soft]# docker inspect -f  '{{.Id}}' 8d418a7b6021
8d418a7b60216ed677ada5ca5fe1e82a953af6702837e8e05c95b16d23241d47