CODEWITHSUNDEEP
dockercontainers
Woko
Woko

Reputation: 1759

How to get docker version in container?

I want to know the version of docker when I'm inside a container.

I know that /proc/self/cgroup can tell me if I'm in a container. But how about the version?

Thanks for any tips!

Upvotes: 1

Views: 2391

Answers (3)

Adiii
Adiii

Reputation: 59896

The first and safe approach that I will recommend is to pass the docker version to the container as an environment variable.

docker run -e DOCKER_VERSION="$(docker -v)" -it --rm alpine sh -c "echo \$DOCKER_VERSION"

The second approach can be is to mount host docker-socket but you should know about this risk of docker-socket just for getting the version of docker.

docker run --rm -it  -v /var/run/docker.sock:/var/run/docker.sock alpine ash -c "apk add --no-cache curl && curl --unix-socket /var/run/docker.sock http://localhost/version"

Upvotes: 0

Shardj
Shardj

Reputation: 1969

You can use the docker api from inside the container to query the docker engine https://docs.docker.com/develop/sdk/ specifically you can use this endpoint https://docs.docker.com/engine/api/v1.30/#operation/SystemVersion

Upvotes: 1

Hari Ennekat
Hari Ennekat

Reputation: 340

You can execute command on host machine while you are inside a container.

ssh -l ${USERNAME} ${HOSTNAME} "docker -v"

Upvotes: 1

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