Is it possible for image to have multiple tags?

Question

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...

Answer 1

You can create multiple tags:

docker tag <id> <user>/<image>:0.2
docker tag <id> <user>/<image>:latest

and push these.

Answer 2

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.

Answer 3

You can build an image with several tags and then push the image without explicitly specifying a tag. This will push all image tags to your image registry.

Example:

docker build -t reg/user/image:foo -t reg/user/image:latest .

docker push reg/user/image

Answer 4

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.