Docker outside of Docker

コンテナからコンテナを操作するその2

コンテナ側からホストのdocker.sock (/var/run/docker.sock)をマウントすることでコンテナ上のDockerコマンドはホスト側のDocker環境で実行される。 https://blog.nijohando.jp/post/docker-in-docker-docker-outside-of-docker/

dood

docker.sock をマウントした docker コンテナをrun してshellに接続

$ docker run -it -v /var/run/docker.sock:/var/run/docker.sock --name some-docker -d docker:stable-dind sh
$ docker exec -it some-docker sh

シェルで docker run とかいろいろ試す。ホスト側でいろいろ試した痕跡が見えた。

/ # docker ps
CONTAINER ID        IMAGE                COMMAND                  CREATED             STATUS              PORTS               NAMES
a5afae659859        docker:stable-dind   "dockerd-entrypoint.…"   19 seconds ago      Up 19 seconds       2375-2376/tcp       some-docker

/ # docker run hello-world

Hello from Docker!

/ # docker ps -a
CONTAINER ID        IMAGE                COMMAND                  CREATED             STATUS                      PORTS               NAMES
1a6ced6e0f86        hello-world          "/hello"                 11 seconds ago      Exited (0) 10 seconds ago                       romantic_curie
a5afae659859        docker:stable-dind   "dockerd-entrypoint.…"   54 seconds ago      Up 53 seconds               2375-2376/tcp       some-docker
b87a1ce1b0eb        docker:stable-dind   "dockerd-entrypoint.…"   4 minutes ago       Exited (1) 4 minutes ago                        zealous_engelbart
aa633f1665b0        docker:stable-dind   "dockerd-entrypoint.…"   4 minutes ago       Exited (1) 4 minutes ago                        gifted_sinoussi
5df11e442065        docker:stable-dind   "dockerd-entrypoint.…"   5 minutes ago       Exited (1) 4 minutes ago                        dazzling_sinoussi
edb9406c5701        docker:stable-dind   "dockerd-entrypoint.…"   6 minutes ago       Exited (1) 6 minutes ago                        peaceful_banzai
5a951b9b9229        hello-world          "/hello"                 9 minutes ago       Exited (0) 9 minutes ago                        elegant_mclaren
142f3fb5d0bb        hello-world          "/hello"                 9 minutes ago       Exited (0) 9 minutes ago                        gifted_mayer
96114c99440c        hello-world          "/hello"                 11 minutes ago      Exited (0) 11 minutes ago                       xenodochial_archimedes
7563b251264c        hello-world          "/hello"                 12 minutes ago      Exited (0) 12 minutes ago                       vibrant_snyder