Is it possible for image to have multiple tags?
DockerDockerhubDocker Problem Overview
When I am pushing new image to repo I would like it to have two tags for example 0.2 and latest. This would allow to always pull latest image version by using latest tag and a specific version by using 0.2 tag for example. Is it possible with docker?
Is there any workaround? The only solution I see is to make two separate pushes...
Docker Solutions
Solution 1 - Docker
You can build an image with several tags and then push the image with the --all-tags option.
Example:
docker build -t reg/user/image:foo -t reg/user/image:latest .
docker push reg/user/image --all-tags
Older Docker clients that do not support --all-tags will push all tags by default (simply omit the option), newer clients will only push latest by default. As an alternative, you may want to push each tag separately.
Solution 2 - Docker
You can create multiple tags:
docker tag <id> <user>/<image>:0.2
docker tag <id> <user>/<image>:latest
and push these.
Solution 3 - Docker
You need to do one push per each version like:
docker tag test:latest <repo>/<user>/test:latest
docker push <repo>/<user>/test:latest
docker tag test:0.2 <repo>/<user>/test:0.2
docker push <repo>/<user>/test:0.2
You can also combine and say the latest version is 0.2 like:
docker tag <repo>/<user>/test:latest <repo>/<user>/test:0.2
docker push <repo>/<user>/test:0.2
So those will point the same image layer.
Solution 4 - Docker
UPDATE: Prior to Jan 2021
It pushes all the tags, if you dont specify the tags in push command.
docker tag user/imagename:tag1
docker tag user/imagename:tag2
docker push user/imagename
Solution 5 - Docker
There are valid reasons for having multiple tags on an image (see OP) but if you are wanting to add tags for informational purposes, you may be better off with image labels.
Docker labels are inside the image rather than applied to it in the registry. This means the labels are immutable and always get copied with the image.
Label Schema defines a list of interoperable labels for things like version, vcs-ref, build-date and others.
Solution 6 - Docker
If you don't want to refer the image by hash, but "copy a tag" you can do the following:
docker tag image:origin_tag image:target_tag
docker push image:target_tag