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docker tag [OPTIONS] IMAGE[:TAG] [REGISTRYHOST/][USERNAME/]NAME[:TAG]

root@tutorialpro:~# docker tag ubuntu:15.10 tutorialpro/ubuntu:v3
root@tutorialpro:~# docker images tutorialpro/ubuntu:v3
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
tutorialpro/ubuntu  v3                  4e3b13c8a266        3 months ago        136.3 MB