Installing and using CloudBees Jenkins Distribution with Docker

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What is Docker?
Installing using Docker
Running CloudBees Jenkins Distribution in Docker
Completing post-install configuration

The easiest way to install and run CloudBees Jenkins Distribution is with the supported Docker container, which bundles the necessary Java runtime environment and other defaults into the container.

What is Docker?

Docker is a platform for running applications in an isolated environment called a container (or Docker container). Applications like the CloudBees Jenkins Distribution can be downloaded as read-only images (or Docker images), each of which is run in Docker as a container. A Docker container is in effect a running instance of a Docker image. From this perspective, an image is stored permanently more or less (i.e., insofar as image updates are published), whereas containers are stored temporarily. Read more about these concepts in the Docker documentation’s Getting Started.

Docker’s fundamental platform and container design means that a single Docker image for any given application (like CloudBees Jenkins Distribution) can be run on any operating system or cloud service that is also running Docker.

Installing using Docker

This procedure assumes the destination machine has a running Docker daemon available to the administrator.

To verify that Docker is available:

docker info

If Docker has not already been installed, consult the Docker Engine installation guide for more information.

Ensure you configure Docker so it can be managed as a non-root user in Linux. Read more about this in Docker’s Post-installation steps for Linux page of their documentation. This page also contains information about how to configure Docker to start on boot.

Using the Docker image

Once Docker is up and running, the cloudbees/cloudbees-jenkins-distribution image can be pulled and run.

Download the docker image for CloudBees Jenkins Distribution.
```
docker pull cloudbees/cloudbees-jenkins-distribution
```

Running CloudBees Jenkins Distribution in Docker

Run the image for CloudBees Jenkins Distribution as a container in Docker using the docker run command.

If you are using a CloudBees Jenkins Distribution prior to 2.176.2.3, use /var/jenkins_home as the volume instead of /var/cloudbees-jenkins-distribution. For example, -v jenkins-data:/var/jenkins_home \ instead of -v jenkins-data:/var/cloudbees-jenkins-distribution \.

You can use either a basic command or with more specific options.

The basic command is:

docker run cloudbees/cloudbees-jenkins-distribution

The docker run example below provides specific options and explanations.

docker run \
  -u root \
  --rm \ (1)
  -d \ (2)
  -p 8080:8080 \ (3)
  -p 50000:50000 \ (4)
  -v jenkins-data:/var/cloudbees-jenkins-distribution \ (5)
  -v /var/run/docker.sock:/var/run/docker.sock \ (6)
  cloudbees/cloudbees-jenkins-distribution (7)

The annotated options in this docker run … command above are explained as follows (note that a copyable version of this command is available below:

1	( Optional ) Automatically removes the Docker container (which is the instantiation of the `cloudbees/cloudbees-jenkins-distribution` image below) when it is shut down. This keeps your Docker environment tidy if you need to quit CloudBees Jenkins Distribution.
2	( Optional ) Runs the `cloudbees/cloudbees-jenkins-distribution` container in the background (i.e. "detached" mode) and outputs the container ID. If you do not specify this option, then the running Docker log for this container is output in the terminal window.
3	Maps (i.e. "publishes") port 8080 of the `cloudbees/cloudbees-jenkins-distribution` container to port 8080 on the host machine. The first number represents the port on the host while the last represents the container’s port. Therefore, if you specify `-p 49000:8080` for this option, you would access CloudBees Jenkins Distribution on your host machine through port 49000.
4	( Optional ) Maps port 50000 of the `cloudbees/cloudbees-jenkins-distribution` container to port 50000 on the host machine. This is only necessary if you have set up one or more JNLP-based Jenkins agents on other machines to interact with the `cloudbees/cloudbees-jenkins-distribution` container. JNLP-based agents communicate with CloudBees Jenkins Distribution through TCP port 50000 by default. You can change this port number on your CloudBees Jenkins Distribution instance through the Manage Jenkins > Configure Global Security page. If you were to change CloudBees Jenkins Distribution’s TCP port for JNLP agents value to 51000 (for example), then you would need to re-run CloudBees Jenkins Distribution (via this `docker run …` command) and specify this "publish" option with something like `-p 52000:51000`, where the last value matches this changed value on CloudBees Jenkins Distribution and the first value is the port number on the CloudBees Jenkins Distribution’s host machine through which the JNLP-based agents communicate (to CloudBees Jenkins Distribution) - i.e. 52000.
5	( Optional but highly recommended ) Maps the `/var/cloudbees-jenkins-distribution` directory in the container to the Docker volume with the name `jenkins-data`. If this volume does not exist, then this `docker run` command will automatically create the volume for you. This option is required if you want your Jenkins state to persist each time you restart Jenkins (via this `docker run …` command). If you do not specify this option, then Jenkins will effectively reset to a new instance after each restart. The `jenkins-data` volume can be created independently using the `docker volume create` command: `docker volume create jenkins-data`. Also, instead of mapping the `/var/jenkins_home` directory to a Docker volume, you can map this directory to one on your host machine’s file system. For example, specifying the option `-v $HOME/jenkins:/var/jenkins_home` maps the container’s `/var/jenkins_home` directory to the `jenkins` subdirectory within the `$HOME` directory on your host machine, which typically is `/home/<your-username>/jenkins`. On versions prior to `2.176.2.3` you need to use `/var/jenkins_home` instead of `/var-cloudbees-jenkins-distribution`
6	( Optional ) `/var/run/docker.sock` represents the Unix-based socket on which the Docker daemon listens. This mapping allows the `cloudbees/cloudbees-jenkins-distribution` container to communicate with the Docker daemon, which is required if the `cloudbees/cloudbees-jenkins-distribution` container needs to instantiate other Docker containers. This option is necessary if you run declarative Pipelines whose syntax contains the `agent` section with the `docker` parameter - i.e. `agent { docker { … } }`. Read more about this on the Pipeline Syntax page of the Jenkins User Documentation.
7	The `cloudbees/cloudbees-jenkins-distribution` Docker image itself. If this image has not already been downloaded, then this `docker run` command automatically downloads the image for you. Furthermore, if any updates to this image were published since you last ran this command, then running this command again automatically downloads these published image updates.

This Docker image can be downloaded (or updated) independently using the docker pull command: docker pull cloudbees/cloudbees-jenkins-distribution. This Docker image is also accessible from the cloudbees/cloudbees-jenkins-distribution image (from the Docker Hub repository).

To copy and paste the command snippet above, use this annotation-free version here:

docker run \
  -u root \
  --rm \
  -d \
  -p 8080:8080 \
  -p 50000:50000 \
  -v jenkins-data:/var/cloudbees-jenkins-distribution \
  -v /var/run/docker.sock:/var/run/docker.sock \
  cloudbees/cloudbees-jenkins-distribution

After the process has completed, CloudBees Jenkins Distribution service should start automatically and be available in a web browser at localhost:8080 by default.

Completing post-install configuration

After installation, the Getting Started wizard will walk you through installing a curated set of plugins and creating the first admin account.

Security and unlocking the distribution

CloudBees Jenkins Distribution is initially configured to be secure on first launch. During installation, a password is generated and saved in a local file called initialAdminPassword. The file location depends upon the operating system you are using.

This password is required to unlock the instance on the Unlock Jenkins page.

To locate the password:

Open a browser to http://localhost:8080.
Open the initialAdminPassword file using the location displayed on the Unlock Jenkins page.
Copy the password from the file.

Alternatively, the password may be displayed during installation. For example, the output below was from installing on macOS using a WAR file:

*************************************************************
*************************************************************
*************************************************************

Jenkins initial setup is required. An admin user has been created and a password generated.
Please use the following password to proceed to installation:

d661ea28c6b94406ad627601b6f4aa877

This may also be found at: /Users/<username>/.jenkins/secrets/initialAdminPassword

*************************************************************
*************************************************************
*************************************************************

Registration

During setup, you will be prompted to choose a registration type. You can register with a free product key online or contact CloudBees Support to obtain registration activation.

Using the Getting Started wizard

Open a browser to http://localhost:8080.
On the Unlock Jenkins page, paste in the Administrator password retrieved in the previous section in the field. Press Continue.
Select the appropriate registration option on the License page.
- Activate CloudBees Jenkins Distribution (requires online activation): Complete the form on Register CloudBees Jenkins Distribution page. Enter your name, email and company, check the box to accept the license agreement and click Submit. The Setup Wizard will contact CloudBees to create a license and apply the license to the product.
- Use a license key (Apply a valid license key; useful for offline installations): Click Activate CloudBees Jenkins Distribution to obtain a free license (requires internet access). If necessary, contact CloudBees Sales to obtain your existing product registration. Select license key and paste the License Key and License Certificate from your existing registration into the appropriate fields. Review the license and then accept the license by clicking the check box and click Submit.
Select Install suggested plugins on the Customize Jenkins page to install the curated set of plugins recommended by CloudBees.
The Getting Started page displays the setup progress. If any updates are available, you will also be given the option to upgrade. These upgrades may also be performed at a later time using the Beekeeper Upgrade Assistant.
On the Create First Admin User page, enter a username, password (twice), full name, and email address for the first admin user. Press Save and Continue.

Enter a new value for the Jenkins URL on the Instance Configuration page. You may choose to use the default value or to enter a new URL. Press Save and Finish.

The Jenkins URL provides the root URL for absolute links to various Jenkins resources, including email notifications, PR status updates, and the BUILD_URL environment variable provided to build steps.

You may be asked to reboot your system.

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