This project is deprecated in favour of eycloud-app-jenkins.
Easier to do CI than not to.
Run your continuous integration (CI) tests against your Engine Yard AppCloud environments - the exact same configuration you are using in production!
You're developing on OS X or Windows, deploying to Engine Yard AppCloud (Gentoo/Linux), and you're running your CI on your local machine or a spare Ubuntu machine in the corner of the office, or ... you're not running CI at all?
It's a nightmare. It was for me.
And here's some logos:
gem install engineyard-jenkins
This will also install the
jenkins CLI to interact with your Jenkins CI from the command line.
Hosting on Engine Yard AppCloud
Using Engine Yard AppCloud "Quick Start" wizard, create an application with Git Repo
git://github.com/engineyard/jenkins_holding_page.git (options: rails 3, passenger), and add your own SSH keys. This will create an environment called
jenkins_server_production. Boot the environment as a Single instance (or Custom cluster with a single instance).
Optionally, though it is quite pretty, deploy/ship the
jenkins_holding_page application and visit the HTTP link to see the remaining "Almost there..." instructions.
Finally, install Jenkins CI and rebuild the environment:
$ ey-jenkins install_server
When this completes, visit the URL or refresh the "Almost there..." page to see your Jenkins CI server.
jenkins list CLI task you can also test there is a working server with no jobs:
For the Jenkins slaves' configuration, you'll need:
jenkins_server_production instance public key:
$ ey ssh -e jenkins_server_production # cat /home/deploy/.ssh/id_rsa.pub
Do those steps, copy down the configuration and you're done! Now, you either visit your Jenkins CI site or use
jenkins list to see the status of your projects being tested.
Hosting Jenkins CI on Engine Yard AppCloud is optional; yet delightfully simple. Jenkins CI can be hosted anywhere.
If you host your Jenkins CI elsewhere then you need the following information about your Jenkins CI environment to be able to add EngineYard AppCloud instances as Jenkins nodes/slaves:
- Jenkins CI public host & port
- Jenkins CI's user's public key (probably at
- Jenkins CI's user's private key path (probably
Running your CI tests on Engine Yard AppCloud
This is the exciting part - ensuring that your CI tests are being run in the same environment as your production applications. In this case, on Engine Yard AppCloud.
It is assumed that you already have a production application environment (might have multiple applications in it):
In the Engine Yard AppCloud UI, create another environment that matches the production environment exactly (same Ruby, same set of applications, same Unix libraries).
Now, in just a few steps and you will have your applications' tests running in an environment that matches your production environment:
$ cd /my/project $ ey-jenkins install .
cookbooks/jenkins_slave/attributes/default.rb to set up the Jenkins CI instance details gathered above.
$ ey recipes upload -e ci_demo_app_ci $ ey recipes apply -e ci_demo_app_ci
ci_demo_app_ci environment, visit your Jenkins CI and WOW! jobs have been created, they are already running, and they are doing it upon your
At any time from the command line you can use
jenkins list to see the status of your jobs
- Do not use your production environment as your Jenkins CI slave. There are no guarantees what will happen. I expect bad things.
- You must name your CI environments with a suffix of
- You should not name any other environments with a suffix of
_jenkins_slave; lest they offer themselves to your Jenkins CI as slave nodes.
- Keep your production and CI environments exactly the same. Use the same Ruby implementation/version, same database, and include the same RubyGems and Unix packages. Why? This is the entire point of the exercise: to run your CI tests in the same environment as your production application runs.
For example, note the naming convention of the two CI environments below (one ends in
_jenkins_slave and the other
When you boot your Engine Yard AppCloud CI environments, each resulting EC2 instance executes a special "jenkins_slave" recipe (see
cookbooks/jenkins_slave/recipes/default.rb in your project). This does three things:
- Adds this instance to your Jenkins CI server as a slave
- Adds each Rails/Rack application for the AppCloud environment into your Jenkins CI as a "job".
- Commences the first build of any newly added job.
If your CI instances have already been booted and you re-apply the recipes over and over (
ey recipes apply), nothing good or bad will happen. The instances will stay registered as slaves and the applications will stay registered as Jenkins CI jobs.
If a new application is on the instance, then a new job will be created on Jenkins CI.
To delete a job from Jenkins CI, you should also delete it from your AppCloud CI environment to ensure it isn't re-added the next time you re-apply or re-build or terminate/boot your CI environment. (To delete a job, use the Jenkins CI UI or
jenkins remove APP-NAME from the CLI.)
In essence, to add new Rails/Rack applications into your Jenkins CI server you:
- Add them to one of your Engine Yard AppCloud CI environments (the one that matches the production environment where the application will be hosted)
- Rebuild the environment or re-apply the custom recipes (
ey recipes apply)
Applications are run in their respective CI environment
Thusly demonstrated below: the application/job "ci_demo_app" is in the middle of a build on its target slave "ci_demo_app_ci". See the AppCloud UI example above to see the relationship between the application/job names and the environment/slave names.
Can I add applications/jobs to Jenkins CI other ways?
Yes. There are three simple ways to get Jenkins CI to run tests for your application ("create a job to run builds"). Above is the first: all "applications" on the Engine Yard AppCloud CI environment will automatically become Jenkins CI jobs. The alternates are:
- Use the
jenkins create .command from the jenkins CLI.
--assigned_node xyz flag to make the project's test be executed on a specific slave node. "xyz" is the name of another application on your AppCloud account; your tests will be executed on the same instance, with the same version of Ruby etc.
- Use the Jenkins CI UI to create a new job. As above, you can make sure the tests are run on a specific Engine Yard AppCloud instance by setting the assigned node label to be the same as another AppCloud application in your account that is being tested.
Specifically, Jenkins CI uses "labels" to match jobs to slaves. A common example usage is to label a Windows slave as "windows". A job could then be restricted to only running on slaves with label "windows". We are using this same mechanism.
Automatically triggering job builds
In Jenkins CI, a "job" is one of your projects. Each time it runs your tests, it is called a "build".
It is often desirable to have your SCM trigger Jenkins CI to run your job build whenever you push new code.
GitHub Service Hooks
- Go to the "Admin" section of your GitHub project
- Click "Service Hooks"
- Click "Post-Receive URLs"
- Enter the URL
- Click "Update Settings"
And here's a picture.
You can also use the "Test Hook" link to test this is wired up correctly.
jenkins build path/to/APP-NAME
You are triggering the build via a GET call to an URL endpoint. So you can also use
Copyright (c) 2010 Dr Nic Williams, Engine Yard
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