为镜像创建新标签

为指定的镜像创建新标签 docekr tag 镜像id

$ docker images
REPOSITORY       TAG       IMAGE ID       CREATED          SIZE
charley/centos   centos7   1ce28aeb6c15   30 minutes ago   204MB
charley/ubuntu   v1        f2135bec3c53   16 hours ago     125MB
test/ubuntu      v1        05443cf468db   20 hours ago     0B
ubuntu           latest    e34e831650c1   2 weeks ago      77.9MB
ubuntu           20.04     f78909c2b360   6 weeks ago      72.8MB
hello-world      latest    d2c94e258dcb   9 months ago     13.3kB
cha$ docker tag 1ce28aeb6c15 charley/centos:7
$ docker images
REPOSITORY       TAG       IMAGE ID       CREATED          SIZE
charley/centos   7         1ce28aeb6c15   31 minutes ago   204MB
charley/centos   centos7   1ce28aeb6c15   31 minutes ago   204MB
charley/ubuntu   v1        f2135bec3c53   16 hours ago     125MB
test/ubuntu      v1        05443cf468db   20 hours ago     0B
ubuntu           latest    e34e831650c1   2 weeks ago      77.9MB
ubuntu           20.04     f78909c2b360   6 weeks ago      72.8MB
hello-world      latest    d2c94e258dcb   9 months ago     13.3kB