Docker in Docker¶

Although running Docker inside Docker is generally not recommended, there are some legitimate use cases, such as development of Docker itself.

Docker¶

docker run --privileged --name docker -d docker:dind

Start a daemon instance¶

$ docker run --privileged --name some-docker -d \
    --network some-network --network-alias docker \
    -e DOCKER_TLS_CERTDIR=/certs \
    -v some-docker-certs-ca:/certs/ca \
    -v some-docker-certs-client:/certs/client \
    docker:dind

Custom daemon flags¶

$ docker run --privileged --name some-docker -d \
    --network some-network --network-alias docker \
    -e DOCKER_TLS_CERTDIR=/certs \
    -v some-docker-certs-ca:/certs/ca \
    -v some-docker-certs-client:/certs/client \
    docker:dind --storage-driver overlay2

Where to Store Data¶

$ docker run --privileged --name some-docker -v /my/own/var-lib-docker:/var/lib/docker -d docker:dind

Screenshots¶

https://asciinema.org/a/378669.svg