如何在 AspNetCore 网站 Docker-Container 中使用 Docker 命令？

Question

I'm trying to build a docker image inside an as.netcore docker container. The as.netcore container is a website which collects data from different sources and then dynamically builds a dockerfile. Afterwards I want to create a docker image from the dockerfile inside this as.netcore application.

I tried to mount the docker socket in different ways but I cannot use the docker commands inside my container.

I refered to the following link: http://jpetazzo.github.io/2015/09/03/do-not-use-docker-in-docker-for-ci/

so i tried to run the image and mount the docker socket in following ways:

directly in the cmd:

docker run -v /var/run/docker.sock:/var/run/docker.sock webinterface

inside my docker-compose file:

services:
  webinterface:
    image: webinterface
    container_name: webinterface
    build:
      context: ./WebInterface
      dockerfile: Dockerfile
  external_links:
    - geonode_geonode_1
  ports:
    - "5000:80"
  volumes:
    - /var/run/docker.sock:/var/run/docker.sock

and then I tried to use the docker commands inside the container with:

docker exec -it webinterface bash

but the webinterface does not recognize any docker commands:

root@f3e434254601:/app# docker help
bash: docker: command not found

I also tried to use the docker remote API to execute commands by installing the nuget package "Docker.DotNet" and connect to the docker host as described in the offical documentation:

            DockerClient client2 = new DockerClientConfiguration(new Uri("npipe:////./pipe/docker_engine"))
            .CreateClient();

        return await client2.Containers.ListContainersAsync(
            new ContainersListParameters()
            {
                Limit = 10,
            });

I'm totally lost... Does anyone have an idea? thank you!

Answer 1

If you want to execute docker commands you will still need to install docker.io in your container (here called "webinterface").

Add this to the Dockerfile of your container-image.