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Running your own CI infrastructure

The OpenStack CI infrastructure is designed to be shared amongst other projects wanting a scalable cloud based CI system. We’re delighted when someone wants to reuse what we’re building.

To avoid having lots of meta references in the rest of the system documentation, we document most things targeted specifically for use in the OpenStack CI system itself. This chapter acts as a patch to the rest of our documentation explaining how to reuse the OpenStack CI infrastructure for another project.

Requirements

  • You need a cloud of some sort, all our tooling is built for OpenStack clouds :).
  • A service account for your CI systems within that cloud/clouds.
  • Optionally a service account for your Jenkins nodes (separation of concerns - this account has its credentials loaded into the cloud itself). You can run with one account, but then you risk a larger cascade compromise if there is a bug in nodepool.
  • A domain for your servers to live in; puppet is hostname based, having everything in sync is just easier.
  • A git repository that you can store your code in :).

Initial setup

  1. Manually boot a machine or VM with 2G+ of ram to be the puppetmaster. Average memory consumption is between 1GB-1.5GB with random peaks around 2GB for puppetdb and ruby processes.
  2. Clone the CI config repository and adjust it as necessary. Avoiding forks and overriding the default config from Infra is a good practice to customize your CI system. The CI config is split in 2 projects: a) system-config Contains information on how systems are operated. b) project-config Contains configuration data used by OpenStack projects and services. For more details on the config repo split, read the following spec: http://specs.openstack.org/openstack-infra/infra-specs/specs/config-repo-split.html.
  3. Follow http://docs.openstack.org/infra/system-config/puppet.html#id2 and use your repository in addition to the OpenStack CI repository. This is appropriate to stay in sync with OpenStack Infra team rolling out new functionality and at the same time applying the necessary customizations through the config overrides. This step consists in configuring puppetmaster to load CI config into modulepath for both Infra projects and your custom CI repository. The necessary changes are explained in the sections below.

Changes required

To run your own infrastructure we recommend you to clone the entire tree and reuse the system and project configurations from the OpenStack Infrastructure repositories. Your config overrides will be applied on top of these settings by replacing hostnames and class names throughout.

site.pp

This file lists the specific servers you are running. Minimally you need a puppetmaster, jenkins, and then one or more slaves with appropriate distro choices. To use all the choices for running your tests, you also need zuul, nodepool, and puppetBoard. Unless you have a specific need to setup your own gerrit review system, your CI system can consume events from the upstream gerrit and test OpenStack changes.

A minimal site.pp can be useful to start with to get up and running. E.g. delete all but the puppetmaster and default definitions. Create a node entry for each server registered on puppetmaster and the define the class it belongs to. The parameters will depend on each server and you can use the configuration used by the Infra team as a template.

Example:

node 'jenkins.example.com' {
  class { 'your-company_openstack_project::jenkins':
    jenkins_jobs_password   => hiera('jenkins_password'),
    <...>
  }
}

modules/openstack_project

This tree defines the shape of servers (some of which are unique, some of which are scaled horizonally, thus the separation). To run your own infrastructure we recommend you copy the entire tree, delete (or simply ignore) any servers you won’t run, and replace hostnames and class names with yours throughout. Some templates can be used as-is by leaving their references to point within the openstack_project tree.

Bootstrapping

The minimum set of things to port across is:

  • modules/openstack_project/manifests/params.pp
  • modules/openstack_project/manifests/server.pp
  • modules/openstack_project/manifests/template.pp
  • modules/openstack_project/manifests/automatic_upgrades.pp
  • modules/openstack_project/manifests/base.pp May need additional changes beyond the search/replace? - User list.
  • modules/openstack_project/manifests/users.pp
  • modules/openstack_project/manifests/puppetmaster.pp
  • modules/openstack_project/templates/puppet.conf.erb
  • The default node definition in site.pp
  • The puppetmaster definition in site.pp
  • The puppetdb definition in site.pp

Then follow the Puppet Master instructions for bringing up a puppetmaster, replacing openstack_project with your project name. You’ll need to populate hiera at the end with the minimum set of keys:

  • sysadmins

Copy in your cloud credentials to /root/ci-launch - e.g. to $projectname-rs.sh for a rackspace cloud.

Stage 2

Migrate:

  • modules/openstack_project/manifests/puppetdb.pp

Then start up your puppet db with puppet board (see system-config: launch/README for full details):

sudo su -
cd /opt/system-config/production/launch
. /root/ci-launch/
export FQDN=servername.project.example.com
puppet cert generate $FQDN
./launch-node.py $FQDN --server puppetmaster.project.example.com
  • This will chug for a while.
  • Run the DNS update commands [nb: install your DNS API by hand at the moment]

Stage 3 - gerrit

Gerrit is a combined master repository management and code review system. See the Gerrit documentation for the common operational tasks for it.

To set it up, you’ll need a small png 167px x 56x with a project logo for branding and a 485px × 161px png as the top of page background. You can of course alter the appearance and css to your hearts content.

In addition you need to set a dozen or so hiera variables (see site.pp), these will require manually creating keys and passwords.

Migrate the manifests:

  • modules/openstack_project/manifests/gerrit.pp. Note that this is a thin shim over a generic gerrit module: you’ll be forking most of this and maintaining it indefinitely. If you don’t want a CLA, be sure to elide those portions. Replace the file paths for branding files you’ve replaced. Many of the scripts can be used from openstack_projects though (which ones is yet to be determined).
    • All the ‘=> absent’ cronjobs can be elided: they are cleanup for older versions of this manifest.
    • the LP links that reference openstack specifically should instead point to your project (or project group) on Launchpad [or wherever you want them].
    • openstackwatch creates an rss feed of the unified changes from many projects - it is entirely optional.
    • The cla files should be skipped or forked; they are specific to OpenStack.
    • The title and page-bkg are OpenStack specific and should be replaced.
    • The GerritSite.css is OpenStack specific - it references the openstack-page-bkg image.
    • The gerritsyncusers cron reference can be dropped.
    • The sync_launchpad_users cron reference can be dropped.
    • You need to modify the puppet path for gerrit acls - they should come from your project - make the directory but you can leave it empty (except for a . file to let git add it). The Project Creator’s Guide covers how it gets populated when your infrastructure is working.
    • Ditto projects.yaml and projects.ini, which is passed in from your review.pp - something like $PROJECT/files/review.projects.yaml and $PROJECT/templates/review.projects.ini.erb
    • set_agreements is a database migration tool for gerrit CLAs; not needed unless you have CLAs.
  • modules/openstack_project/manifests/review.pp.
    • Contact store should be set to false as at this stage we don’t have a secure store setup.
    • Start with just local replication, plus github if you have a github organisation already.
    • Ditto starting without gerritbot.
    • Be sure to update projects_file - that is openstack specific. The defaults at the top all need to be updated. You probably want to start with no initial projects until gerrit is happy for you, and update the defaults to match your project. The gerrit user and commit defaults should be changed, as should the homepage, but the rest should be fine.

Create any acl config files for your project.

Update site.pp to reference the new gerrit manifest. See review.pp for documentation on the hiera keys.

SSH keys can be made via ssh-keygen, you will need passwordless keys to be able to restart without manual intervention. See the ssh-keygen man page for more information. but in short:

ssh-keygen -t rsa -P '' -f ssh_host_rsa_key
ssh-keygen -t dsa -P '' -f ssh_host_dsa_key
ssh-keygen -t rsa -P '' -f project_ssh_rsa_key

You will need to get an ssl certificate - if you’re testing you may want a self signed one (but be sure to set ssl_chain_file to ‘’ in review.pp in that case). http://lmgtfy.com/q=self+signed+certificate. To put them in hiera you need to use : |:

foo: |
  literal
  contents
  here

Launch a node - be sure to pass –flavor “10G” to get a flavor with at least 10G+ of RAM, as gerrit is configured for 8G of heap.

Follow the Gerrit documentation for instructions on getting gerrit configured once installed.

Finally, you should be able to follow the Project Creator’s Guide to setup a project at this point. (Zuul and Jenkins jobs obviously won’t work yet).

Stage 4 - Zuul

Zuul is the scheduler in the OpenStack CI system queuing and dispatching work across multiple CI engines (via gearman). With a working code review system we can now set up a scheduler. Once setup, new patches uploaded to gerrit should be picked up and have a zuul verification fail (with ‘LOST’ which indicates the Jenkins environment is gone).

  1. Create a zuul user (the upstream site.pp uses jenkins for historical reasons):

    ssh-keygen -t rsa -P '' -f zuul_ssh_key
    
    cat zuul_ssh_key.pub | ssh -p 29418 $USER@$HOST gerrit create-account \
      --group "'Continuous Integration Tools'" \
      --full-name "'Zuul'" \
      --email zuul@lists.openstack.org \
      --ssh-key - zuul
    
  2. Add the private key you made to hiera as zuul_ssh_private_key_contents.

  3. Migrate modules/openstack_project/zuul/layout.yaml. This file has both broad structure such as pipelines which you’ll want to preserve as-is, and project specific entries that you’ll want to delete. And probably update the error links to point to your own wiki.

    Be sure to keep the ^.*$ job parameter.

  4. Migrate modules/openstack_project/manifests/zuul_prod.pp into your project tree.

  5. Migrate modules/openstack_project/zuul/scoreboard.html into your tree. This file is used for diagnosing intermittent failures : if you don’t have flakey tests you can just trim this from the zuul definition.

  6. Migrate the definition in site.pp to your project. Note the jenkins -> zuul user and variable change. You have no gearman workers yet, so make that list be empty.

  7. Launch it, using a 1GB node.

Stage 5 - Jenkins Master(s)

For Zuul to schedule work, it needs one or more Gearman connected Jenkins masters.

The minimum setup is one master, but if you will be permitting any code submitter to trigger test runs, we recommend having two: one untrusted and one trusted for doing release automation (where the released code integrity is important). When doing bring-up, bringing up jenkins01 first is probably best as that is the first of the horizontally-scalable untrusted masters, which get the most load (as they run jobs from anyone).

  1. Make a jenkins master ssh key (shared across all jenkins masters):

    ssh-keygen -t rsa -P '' -f jenkins_ssh_key
    
  2. Make a self signed certificate for the jenkins site.

  3. Migrate modules/openstack_project/manifests/init.pp This gets the public jenkins key embedded in it.

  4. Setup an equivalent to modules/openstack_project/files/jenkins_job_builder/config for your project. This is documented in the Project Creator’s Guide. You should copy hooks.yaml and defaults.yaml across as-is, and if you want the stock set of python jobs that OpenStack uses, the python-jobs.yaml and pypi-jobs.yaml files too. Macros.yaml will need to be copied and customised. See the jenkins-job-builder docs for information on customisation - failing to customise isn’t harmful, but you may find your jobs try to post errors to the OpenStack logging site :). Finally setup the list of projects to build in projects.yaml. The config job with the puppet-lint/syntax and pyflakes job can be particularly useful for ensuring you can push updates with confidence (which needs puppet-modules-jobs.yaml).

  5. Migrate modules/openstack_project/files/jenkins/jenkins.default unless you are happy with a 12G java memory footprint (which only large busy sites will need).

  6. Migrate modules/openstack_project/manifests/jenkins.pp Be sure to replace gerrig with your actual service account user.

  7. Migrate jenkins01.openstack.org in site.pp. As we don’t have zmq setup yet, leave that list blank. Be sure to add this jenkins into the zuul gear list.

  8. Update hiera with the relevant parameters. You’ll need to get the jenkins_jobs_password from Jenkins (see http://docs.openstack.org/infra/jenkins-job-builder/installation.html#configuration-file) after Jenkins is up - start with it set to ‘’. You can use your own user or make a dedicated user.

  9. Launch the node with a size larger than the jenkins size you specified.

  10. Setup Jenkins.

At this stage doing a ‘recheck’ should still report LOST on a change. But in the zuul debug.log in /var/log/zuul you should see a ‘build xxx not registered’ being reported from gearman : this indicates you have never had an executor register itself for that queue, and it’s being ignored.

Stage 6 - Static slaves

The OpenStack CI infrastructure has two sets of Jenkins slaves : dynamically managed via nodepool and statically managed by hand. A by-hand slave is easier to bring up initially, so that’s our next step.

The platform specific slaves are named $platform-serial.slave.$PROJECT in site.pp. For instance, Python2.6 is not widely available now, so it runs on centos6-xx.slave.$platform nodes.

  1. Migrate modules/openstack_project/manifests/slave.pp We reuse tmpcleanup as-is.

  2. Convert a slave definition in site.pp. Lets say /^centos6-?\d+\.slave\.openstack\.org$/

  3. Launch a node, passing in –image and –flavor to get a node that you want :). e.g:

    launch-node.py centos6-1.slave.openstack.org --image $IMAGE --flavor "1G" \
      mydns
    
  4. Go into the Jenkins config and press ‘test connection’ on the gearman config to register the new slave.

Now, if you push a change, zuul should pick it up and run it on jenkins, and you can get onto the interesting thing of debugging why it fails.

Later chapters will cover setting up the test storage servers so you can see build history without logging into Jenkins.