Spin up Jenkins in container with Docker client
There are several ways to deploy Docker containers from jenkins pipeline. The method I have described here seems to be the easiest to quickly spin up a test environment for CI/CD.
Implementation
This is an example of how to add a Docker client to the official Jenkins Docker image to make the Jenkins pipeline able to deploy a containerized application to the same host Docker engine. You need to have up and running Docker on your host.
In this example I use official Jenkins lts image on alpine pulled from dockerhub.
docker pull jenkins/jenkins:2.263.2-lts-alpine
Or just clone this repo and run docker build command.
docker build -t ehrnjic/jenkins-alp-dcli:0.1 .
Once the new image is built run a new container.
docker run -d --rm \
--name jenkins \
-p 8080:8080 -p 50000:50000 \
-v ~/vol-docker/jenkins/jenkins_home:/var/jenkins_home \
-v /var/run/docker.sock:/var/run/docker.sock \
ehrnjic/jenkins-alp-dcli:0.1
To test whether the Docker client has access to host Docker daemon you can execute this command:
docker exec -it jenkins docker version
In some cases, if you got permission denied while Docker client trying to connect to the Docker daemon socket at unix:///var/run/docker.sock, you need to allow access to Docker daemon socket on host. This is not safe but it is the simplest way, just give rw access to socket for others.
sudo chmod o+rw /var/run/docker.sock
Or you can add rw access for the user 'jenkins' who has UID 1000 and GID 1000.