root@server:~/docker# docker image tag example/echo:latest jacegem/echo:latestroot@server:~/docker# docker image ls
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
example/echo        latest              133a6f8f5426        3 hours ago         750MB
jacegem/echo        latest              133a6f8f5426        3 hours ago         750MB
<none>              <none>              e5bf61deed81        3 hours ago         750MB
nginx               latest              53f3fd8007f7        3 weeks ago         109MB
golang              1.9                 ef89ef5c42a9        10 months ago       750MB