diff --git a/jenkins/content.md b/jenkins/content.md index bf457de52..56df6d566 100644 --- a/jenkins/content.md +++ b/jenkins/content.md @@ -9,38 +9,151 @@ This is a fully functional Jenkins server, based on the Long Term Support releas # How to use this image ```console -$ docker run -p 8080:8080 jenkins +docker run -p 8080:8080 -p 50000:50000 jenkins ``` -This will store the workspace in /var/jenkins_home. All Jenkins data lives in there - including plugins and configuration. You will probably want to make that a persistent volume: +This will store the workspace in /var/jenkins_home. All Jenkins data lives in there - including plugins and configuration. You will probably want to make that a persistent volume (recommended): ```console -$ docker run --name myjenkins -p 8080:8080 -v /var/jenkins_home jenkins +docker run -p 8080:8080 -p 50000:50000 -v /your/home:/var/jenkins_home jenkins ``` -The volume for the "myjenkins" named container will then be persistent. +This will store the jenkins data in `/your/home` on the host. Ensure that `/your/home` is accessible by the jenkins user in container (jenkins user - uid 1000) or use `-u some_other_user` parameter with `docker run`. -You can also bind mount in a volume from the host: - -First, ensure that /your/home is accessible by the jenkins user in container (jenkins user - uid 102 normally - or use -u root), then: +You can also use a volume container: ```console -$ docker run -p 8080:8080 -v /your/home:/var/jenkins_home jenkins +docker run --name myjenkins -p 8080:8080 -p 50000:50000 -v /var/jenkins_home jenkins ``` +Then myjenkins container has the volume (please do read about docker volume handling to find out more). + ## Backing up data If you bind mount in a volume - you can simply back up that directory (which is jenkins_home) at any time. -If your volume is inside a container - you can use `docker cp -$ID:/var/jenkins_home` command to extract the data. +This is highly recommended. Treat the jenkins_home directory as you would a database - in Docker you would generally put a database on a volume. -## Attaching build executors +If your volume is inside a container - you can use `docker cp $ID:/var/jenkins_home` command to extract the data, or other options to find where the volume data is. Note that some symlinks on some OSes may be converted to copies (this can confuse jenkins with lastStableBuild links etc) -You can run builds on the master (out of the box) buf if you want to attach build slave servers: make sure you map the port: `-p 50000:50000` - which will be used when you connect a slave agent. +For more info check Docker docs section on [Managing data in containers](https://docs.docker.com/userguide/dockervolumes/) -[Here](https://registry.hub.docker.com/u/maestrodev/build-agent/) is an example docker container you can use as a build server with lots of good tools installed - which is well worth trying. +# Setting the number of executors -## Upgrading +You can specify and set the number of executors of your Jenkins master instance using a groovy script. By default its set to 2 executors, but you can extend the image and change it to your desired number of executors : + +`executors.groovy` + + import jenkins.model.* + Jenkins.instance.setNumExecutors(5) + +and `Dockerfile` + +```console +FROM jenkins +COPY executors.groovy /usr/share/jenkins/ref/init.groovy.d/executors.groovy +``` + +# Attaching build executors + +You can run builds on the master (out of the box) but if you want to attach build slave servers: make sure you map the port: `-p 50000:50000` - which will be used when you connect a slave agent. + +# Passing JVM parameters + +You might need to customize the JVM running Jenkins, typically to pass system properties or tweak heap memory settings. Use JAVA_OPTS environment variable for this purpose : + +```console +docker run --name myjenkins -p 8080:8080 -p 50000:50000 --env JAVA_OPTS=-Dhudson.footerURL=http://mycompany.com jenkins +``` + +# Configuring logging + +Jenkins logging can be configured through a properties file and `java.util.logging.config.file` Java property. For example: + +```console +mkdir data +cat > data/log.properties <