Exercises

You learned a lot about Jenkins configuration throughout this chapter. To consolidate your knowledge, we recommend the following exercises on preparing Jenkins images and testing the Jenkins environment:

1. Create Jenkins master and agent Docker images and use them to run a Jenkins infrastructure capable of building Ruby projects:
   1. Create the Jenkins master Dockerfile, which automatically installs the Docker plugin.
   2. Build the master image and run the Jenkins instance.
   3. Create the agent Dockerfile (suitable for the dynamic agent provisioning), which installs the Ruby interpreter.
   4. Build the agent image.
   5. Change the configuration in the Jenkins instance to use the agent image.
2. Create a pipeline that runs a Ruby script printing Hello World from Ruby:
   1. Create a new pipeline.
   2. Use the following shell command to create the hello.rb script on the fly:

sh "echo \"puts 'Hello World from Ruby'\" > hello.rb"

3. Add the command...