How to rename the docker image name

Docker image rename: Create a tag TARGET_IMAGE that refers to SOURCE_IMAGE, and remove the SOURCE_IMAGE image.

Usage:	
     docker tag SOURCE_IMAGE[:TAG] TARGET_IMAGE[:TAG]

1. List docker images

➜  ~ docker images

2. Create a tag docker image


➜  ~ docker tag ccc6e87d482b u-lnmp

➜  ~ docker images

3. Remove docker source image

➜  ~ docker rmi ubuntu
Untagged: ubuntu:latest
Untagged: ubuntu@sha256:8d31dad0c58f552e890d68bbfb735588b6b820a46e459672d96e585871acc110

4. List docker images

➜  ~ docker images

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