root@server:~/docker# docker image ls -a
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
<none>              <none>              b4ba25ac2cae        3 minutes ago       750MB
example/echo        latest              e5bf61deed81        3 minutes ago       750MB
<none>              <none>              58f3cb19c839        3 minutes ago       750MB
golang              1.9                 ef89ef5c42a9        10 months ago       750MB