docker tag : 标记本地镜像,将其归入某一仓库。
docker tag [OPTIONS] IMAGE[:TAG] [REGISTRYHOST/][USERNAME/]NAME[:TAG]
将镜像ubuntu:15.10标记为 runoob/ubuntu:v3 镜像。
root@runoob:~# docker tag ubuntu:15.10 runoob/ubuntu:v3
root@runoob:~# docker images runoob/ubuntu:v3
REPOSITORY TAG IMAGE ID CREATED SIZE