How to run Jenkins from a Docker Container

(Linux Operating System)

Installation

Install Docker

• Enable Virtualization, Install VirtualBox, Install Docker

Create Directory

• Create a new directory from Terminal
  • mkdir -p ~/Docker/Jenkins

Build docker image and run

• Execute the command below from the newly created directory.

docker run
  -u root
  --rm
  -d
  -p 8080:8080
  -p 50000:50000
  -v ~/Docker/Jenkins:/var/jenkins_home
  -v /var/run/docker.sock:/var/run/docker.sock
  --name jenkins 
  jenkinsci/blueocean

• Each flag from the above command is described more thoroughly below
  • -u root - is needed to be able bind docker service with jenkins
  • --rm - is used to remove this container after finishing the run
  • -d - run as daemon, so you can detach console window
  • -p 8080:8080 and -p 50000:50000 - expose jenkins ports for main Jenkins and slave communication
  • ~/Docker/Jenkins - my created directory
  • -v /var/run/docker.sock:/var/run/docker.sock - mount/bid docker sockets
  • --name jenkins - alias for created container - e.g. to be able login docker machine easily
  • jenkinsci/blueocean - name of docker used to create Jenkins - released every time when new blue ocean is released
• Single line view below

docker run -u root --rm -d -p 8080:8080 -p 50000:50000 -v ~/Docker/Jenkins:/var/jenkins_home -v /var/run/docker.sock:/var/run/docker.sock --name jenkins jenkinsci/blueocean

Jenkins configuration

• Open web browser and type address localhost:8080
• The /var/jenkins_home/secrets/initialAdminPassword file is located under mounted place.
  • For example if /var/jenkins_home is “mapped” to ~/Docker/Jenkins, then file is located at ~/Docker/Jenkins/secrets/initialAdminPassword

Starting Jenkins

---

---

Interacting with Container

Running created container

• Execute the command below to run the newly created container.

docker container start jenkins

Listing running container

docker container ls --all

• Executing the command above should yield an output comparable to that below.

docker ps

CONTAINER ID        IMAGE                 COMMAND                  CREATED             STATUS              PORTS                                              NAMES
42e3edd6087b        jenkinsci/blueocean   "/sbin/tini -- /usr/…"   12 minutes ago      Up 12 minutes       0.0.0.0:8080->8080/tcp, 0.0.0.0:50000->50000/tcp   jenkins

Stop container

• Execute the command below to stop the container.
  • Note: You can also use Container ID instead alias name

docker container stop jenkins

Remove container

• Execute the command below to remove the container.
  • Note: Stopping and removing container is also required to be able rebuild docker (container)

docker container rm jenkins

Remove image

• Execute the command below to remove the image.

docker image rm jenkinsci/blueocean

---

---

Bulk removing images and containers:

#!/bin/bash
# Delete all containers
docker rm $(docker ps -a -q)
# Delete all images
docker rmi $(docker images -q)

---

---

Sources

• https://github.com/auriuki/jenkins-docker