This charm (along with its companion, jenkins-agent) provides an easy way to deploy Jenkins on Ubuntu server and scale out Jenkins slaves.
This charm provides a Jenkins Server which can be accessed, after exposing, on http://<master>:8080.
If you want to run jobs on separate nodes you will also need to deploy the jenkins-agent charm:
juju deploy jenkins
juju deploy -n 5 jenkins-agent
juju add-relation jenkins jenkins-agent
Slaves will attempt to connect via JNLP on port 48484 by default. This is configurable, e.g.:
juju config jenkins jnlp-port=12345
If you want the previously-default behaviour of a random TCP port, you can set this to 0:
juju config jenkins jnlp-port=0
Or if you want to disable the feature entirely, set it to -1:
juju config jenkins jnlp-port=-1
The default password for the 'admin' account will be auto-generated, or can be
set via juju config. You can retrieve the admin credentials using:
juju run-action jenkins/0 get-admin-credentials
You should avoid changing the admin password within the Jenkins UI - this account is used by the charm to manage slave configuration.
Then feel free to expose your Jenkins master:
juju expose jenkins
The Jenkins UI will be accessible on http://<master>:8080.
The main method to use the Jenkins service at scale is to add units to the jenkins-agent, as illustrated in the example usage:
juju deploy -n 5 jenkins-agent
Here the "-n 5" is adding 5 additional units (instances) to the jenkins-agent. Of course that "5" can be as large as you wish or your cloud provider supports. Additional information on scaling services with add-unit can be found at Juju Scaling Docs.
This charm includes Juju storage support which can be used in the standard way, for example:
juju deploy jenkins --storage jenkins=10G
Adding storage to an existing application is not supported.
You have already seen the password configuration in the "Usage" section. Some other interesting config options are plugins and release. You can add config options via the command line with juju set or via a config file. More information on Juju config is at Juju Config Docs.
juju config jenkins plugins=htmlpublisher view-job-filters bazaar git
juju config jenkins release=trunk
You could also set these config options via a config.yaml on jenkins deploy. For example your config.yaml could look like:
jenkins:
plugins: htmlpublisher view-job-filters bazaar git
release: trunk
You would then deploy jenkins with your config such as:
juju deploy --config config.yaml jenkins
If you wish to perform custom configuration of either the master or slave services, you can branch this charm and add install hooks into hooks/install.d.
These will be executed when the main install, config-changed or upgrade-charm hooks are executed (as the config-changed and upgrade-charm hooks just call install).
Additional hooks are executed in the context of the install hook so you may use any variables which are defined in this hook.