How to get Container Id of Docker in Jenkins

Question

I am using Docker Custom Build Environment Plugin to build my project inside "jpetazzo/dind" docker image. After building, in console output it shows:

Docker container 212ad049dfdf8b7180b8c9b185ddfc586b301174414c40969994f7b3e64f68bc started to host the build

$ docker exec --tty 212ad049dfdf8b7180b8c9b185ddfc586b301174414c40969994f7b3e64f68bc env

[workspace] $ docker exec --tty --user 122:docker 4aea29fff86ba4e50dbcc7387f4f23c55ff3661322fb430a099435e905d6eeef env BUILD_DISPLAY_NAME=#73

Here Docker Container which got started has container id 212ad049dfdf8b7180b8c9b185ddfc586b301174414c40969994f7b3e64f68bc . Now further I want to execute some command on "Execute shell" part in "Build" option in Jenkins, there I want to use this Container Id. I tried using ${BUILD_CONTAINER_ID} as mentioned in the plugin page. But that does't work.

Answer 1

The documentation tells you to use docker run, but you're trying to do docker exec. The exec subcommand only works on a currently running container.

I suppose you could do a docker run -d to start the container in the background, and then make sure to docker stop when you're done. I suspect this will leave you with some orphaned running containers when things go wrong, though.