Exercises

We have learned a lot about Jenkins configuration throughout this chapter. To consolidate the knowledge, we recommend two exercises on preparing the Jenkins images and testing the Jenkins environment.

1.  Create Jenkins master and slave Docker images and use them to run the Jenkins infrastructure capable of building the Ruby projects:
   • Create the master Dockerfile, which automatically installs the Docker plugin.
   • Build the master image and run the Jenkins instance
   • Create the slave Dockerfile (suitable for the dynamic slave provisioning), which installs the Ruby interpreter
   • Build the slave image
   • Change the configuration in the Jenkins instance to use the slave image
2. Create a pipeline, which runs a Ruby script printing Hello World from Ruby:
   • Create a new pipeline
   • Use the following shell command to create the hello.rb script on the fly:sh "echo "puts 'Hello World from Ruby'" > hello.rb"
   • Add the command to run hello.rb using the Ruby interpreter
   • Run the build and observe the console output