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What happens when you deploy your app, and then you want to fix a bug, or simply release an update?

Once you have a container running, you can get its ID using docker ps, then you use docker commit to create a new tag for the image from it:

docker commit <id> <username>/<imagename>:<tagname>

You can also add a changelog message that lists what changed in the new version:

docker commit --change "description" <id> <username>/<imagename>:<tagname>

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More docker tutorials: