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Configuration Syntax
Configuration Syntax
The following sections describe the main part of Zuul's configuration. All of what follows is found within files inside of the repositories that Zuul manages.
Security Contexts
When a system administrator configures Zuul to operate on a project, they specify one of two security contexts for that project. A config-project is one which is primarily tasked with holding configuration information and job content for Zuul. Jobs which are defined in a config-project are run with elevated privileges, and all Zuul configuration items are available for use. Base jobs (that is, jobs without a parent) may only be defined in config-projects. It is expected that changes to config-projects will undergo careful scrutiny before being merged.
An untrusted-project is a project whose primary focus is not to operate Zuul, but rather it is one of the projects being tested or deployed. The Zuul configuration language available to these projects is somewhat restricted (as detailed in individual sections below), and jobs defined in these projects run in a restricted execution environment since they may be operating on changes which have not yet undergone review.
Configuration Loading
When Zuul starts, it examines all of the git repositories which are
specified by the system administrator in tenant-config
and searches for files in the root of
each repository. Zuul looks first for a file named
zuul.yaml
or a directory named zuul.d
, and if
they are not found, .zuul.yaml
or .zuul.d
(with a leading dot). In the case of an untrusted-project
, the configuration from every
branch is included, however, in the case of a config-project
, only the
master
branch is examined.
When a change is proposed to one of these files in an untrusted-project, the configuration proposed in the change is merged into the running configuration so that any changes to Zuul's configuration are self-testing as part of that change. If there is a configuration error, no jobs will be run and the error will be reported by any applicable pipelines. In the case of a change to a config-project, the new configuration is parsed and examined for errors, but the new configuration is not used in testing the change. This is because configuration in config-projects is able to access elevated privileges and should always be reviewed before being merged.
As soon as a change containing a Zuul configuration change merges to any Zuul-managed repository, the new configuration takes effect immediately.
Configuration Items
The zuul.yaml
and .zuul.yaml
configuration
files are YAML-formatted and are structured as a series of items, each
of which is referenced below.
In the case of a zuul.d
(or .zuul.d
)
directory, Zuul recurses the directory and extends the configuration
using all the .yaml files in the sorted path order. For example, to keep
job's variants in a separate file, it needs to be loaded after the main
entries, for example using number prefixes in file's names:
* zuul.d/pipelines.yaml
* zuul.d/projects.yaml
* zuul.d/01_jobs.yaml
* zuul.d/02_jobs-variants.yaml
Note subdirectories are traversed. Any subdirectories with a
.zuul.ignore
file will be pruned and ignored (this is
facilitates keeping playbooks or roles in the config directory, if
required).
Below are references to the different configuration items you may use within the YAML files:
pipeline_def job_def project_def queue_def secret_def nodeset_def semaphore_def pragma_def