docker image - remove old tag and add new tag

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# Tag the image as below
# docker tag   e0d6b0ded794   <your_newtag_here>

Where <e0d6b0ded794> is the image id of the image you wish to update.

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#remove old tag:

# docker rmi <your_old_tag_here>

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# Check the image, you should only see the newtag:

# docker images | grep <your_newtag_here>

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To load the tar'd docker image:
# docker load -- input