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Help:Puppet-compiler

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Revision as of 20:25, 13 February 2020 by imported>SRodlund (→‎Limitations)
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Overview

You can run puppet-compiler by hand to get the results of a given puppet configuration without having to deploy it to servers.

This page gives some instructions on doing so.

Catalog compiler in integration Jenkins

There is a Jenkins job that takes a Gerrit change and runs the compiler.

Steps:

  1. Push your change to gerrit using git-review
  2. Go to https://integration.wikimedia.org/ci/job/operations-puppet-catalog-compiler/
  3. Go to "Build with parameters" https://integration.wikimedia.org/ci/job/operations-puppet-catalog-compiler/build
  4. In the form, fill change number (from Gerrit) and list of nodes
  5. Hit the Build button
  6. Wait for the Jenkins job to end
  7. You can check for results in the Jenkins Console output
  8. You can see the compiled catalogs in a web frontend. The URL structure is https://puppet-compiler.wmflabs.org/compiler_host/build_id where...
    • compiler_host is the hostname (without domain name) of the compiler node that Jenkins dispatched the build to. A current list of possible compiler nodes is available at https://integration.wikimedia.org/ci/label/puppet-compiler-node/
    • build_id is the unique id of the Jenkins build (changes with every run).
    • This link is automatically constructed and can be found at the bottom of the Jenkins console output after each build.

NOTE: this method won't work for CloudVPS instances (see next method below).

Catalog compiler for CloudVPS

The standard Jenkins-hosted catalog compiler can now target VPS instances. Because VMs are frequently created and deleted, it may be necessary to update the facts from whatever puppetmaster is hosting the VM in question -- instructions for doing that can be found at Nova Resource:Puppet-diffs.


Catalog compiler local run (pcc utility)

There is a also a tool called pcc under the operations/puppet/utils repo. You'll need your Jenkins API token to make it work, retrievable under https://integration.wikimedia.org/ci/user/$YOURUSERNAME/configure.

Example:

$ ./utils/pcc GERRIT_CHANGE_NUMBER LIST_OF_NODES --username YOUR_USERNAME --api-token 12312312312312313  
$ ./utils/pcc 282936 oxygen.eqiad.wmnet --username batman --api-token 12312312312312313

Troubleshooting

Some common errors and mistakes.

  • Catalog for Cloud VPS instances doesn't get any classes/roles.

This happens because $::realm is not set to labs. There are patches in place to fix this, but the puppet-compiler software needs to be released with these patches.

  • ERROR: Unable to find facts for host tools-services-01.tools.eqiad.wmflabs, skipping

If running locally, collect facts by hand from the corresponding puppetmaster. If running in the Jenkins web service for a production host, follow these instructions.

Limitations

The puppet-compiler mechanism won't discover all the issues in the resulting catalog. If the catalog was compiled OK by Jenkins, you may still find some issues when running the puppet agent.
Some known limitations:

  • Files sources. When declaring a File { '/my/file':, the path information you specified in the content parameter will be resolved at puppet agent runtime.
  • Private hiera lookups. The way hiera fetches data may vary between how its done in the puppet-compiler process to how its done in the final puppet master. Specifically, secrets in the private repo.
  • Hiera behaviour. Currently, we don't have a way to know in concrete how hiera is behaving when compiling the catalog. See phabricator ticket T215507 for more information.


Communication and support

Support and administration of the WMCS resources is provided by the Wikimedia Foundation Cloud Services team and Wikimedia movement volunteers. Please reach out with questions and join the conversation:

Discuss and receive general support
Receive mail announcements about critical changes
Subscribe to the cloud-announce@ mailing list (all messages are also mirrored to the cloud@ list)
Track work tasks and report bugs
Use the Phabricator workboard #Cloud-Services for bug reports and feature requests about the Cloud VPS infrastructure itself
Learn about major near-term plans
Read the News wiki page
Read news and stories about Wikimedia Cloud Services
Read the Cloud Services Blog (for the broader Wikimedia movement, see the Wikimedia Technical Blog)

See also