Push an image to docker hub

Login to docker hub.

docker login --username <username> --password <password>

If you skip the --password, it will prompt you to enter during execution.

Grab the ID of image.

docker images   ---> And get from the list generated.

Set a tag

docker tag <id_of_image_read> <hub_account>/<repo_name>:<tag(mostly new tag name)>

Push to Hub

docker push <hub_account>/<repo_name>

It pushes/syncs all the tags.

Reference