Jenkins container with Docker container

Kha Nguyen

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Sep 16, 2015, 11:21:40 PM9/16/15

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I have a use case where I run Jenkins inside a container using this Jenkins official image. Then I also need Jenkins to build Docker images, and for that I also run another container, known as docker-in-docker, with this official image with tag 'dind'. After I have linked the docker-in-docker container with the Jenkins container, I can successfully ping the docker-in-docker container using the alias from the Jenkins container. However, I am unsure about how I can setup docker build for Jenkins. I installed the Docker build step plugin, which exposes an option to install Docker, and to connect to a Docker server. I config the install Docker option, and yet `docker` command is not available. I cannot really connect to the Docker server using the alias and port 2375.

Any help is really appreciated.

Baptiste Mathus

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Sep 17, 2015, 12:59:49 AM9/17/15

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Hi,
Paraphrasing if you're using docker in docker, then think twice ;).

You certainly want to read https://jpetazzo.github.io/2015/09/03/do-not-use-docker-in-docker-for-ci/ (blog by the very author of DinD, hence obviously insightful).

Cheers

Le 17 sept. 2015 5:21 AM, "Kha Nguyen" <nlh...@gmail.com> a écrit :

I have a use case where I run Jenkins inside a container using this Jenkins official image. Then I also need Jenkins to build Docker images, and for that I also run another container, known as docker-in-docker, with this official image with tag 'dind'. After I have linked the docker-in-docker container with the Jenkins container, I can successfully ping the docker-in-docker container using the alias from the Jenkins container. However, I am unsure about how I can setup docker build for Jenkins. I installed the Docker build step plugin, which exposes an option to install Docker, and to connect to a Docker server. I config the install Docker option, and yet `docker` command is not available. I cannot really connect to the Docker server using the alias and port 2375.

Any help is really appreciated.

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Kha Nguyen

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Sep 17, 2015, 1:28:04 AM9/17/15

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Wow! This is interesting! I wonder why this post never showed up in my Google search.

Kha Nguyen

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Sep 17, 2015, 2:42:45 AM9/17/15

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So I ended up with the solution suggested in the article. There is one issue left unresolved though, and that issue is when I use the Docker socket from within the Jenkins container, the container does not have permission to use the socket. I ended up having to modify the permission on the Docker socket on the host machine. I have a working solution now, but it leaves more to desire.