Docs: convert some component config to zuul directives
This updates common and scheduler. Also adds a note to the docs style guide about booleans because I was reminded of it while I was updating this. Change-Id: I56b3e3c8f99548887056b881f9b3d77e9f45b275
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@ -7,15 +7,35 @@ Components
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Zuul is a distributed system consisting of several components, each of
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which is described below. All Zuul processes read the
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**/etc/zuul/zuul.conf** file (an alternate location may be supplied on
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``/etc/zuul/zuul.conf`` file (an alternate location may be supplied on
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the command line) which uses an INI file syntax. Each component may
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have its own configuration file, though you may find it simpler to use
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the same file for all components.
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A minimal Zuul system may consist of a *scheduler* and *executor* both
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running on the same host. Larger installations should consider
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running multiple executors, each on a dedicated host, and running
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mergers on dedicated hosts as well.
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An example ``zuul.conf``:
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.. code-block:: ini
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[gearman]
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server=localhost
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[gearman_server]
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start=true
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log_config=/etc/zuul/gearman-logging.yaml
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[zookeeper]
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hosts=zk1.example.com,zk2.example.com,zk3.example.com
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[webapp]
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status_url=https://zuul.example.com/status
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[scheduler]
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log_config=/etc/zuul/scheduler-logging.yaml
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A minimal Zuul system may consist of a :ref:`scheduler` and
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:ref:`executor` both running on the same host. Larger installations
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should consider running multiple executors, each on a dedicated host,
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and running mergers on dedicated hosts as well.
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Common
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------
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@ -25,46 +45,52 @@ The following applies to all Zuul components.
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Configuration
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~~~~~~~~~~~~~
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The following sections of **zuul.conf** are used by all Zuul components:
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The following sections of ``zuul.conf`` are used by all Zuul components:
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gearman
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"""""""
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Client connection information for gearman.
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.. attr:: gearman
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**server** (required)
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Hostname or IP address of the Gearman server::
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Client connection information for Gearman.
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server=gearman.example.com
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.. attr:: server
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:required:
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**port**
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Port on which the Gearman server is listening::
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Hostname or IP address of the Gearman server.
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port=4730
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.. attr:: port
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:default: 4730
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**ssl_ca**
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An openssl file containing a set of concatenated “certification
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authority” certificates in PEM formet.
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Port on which the Gearman server is listening.
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**ssl_cert**
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An openssl file containing the client public certificate in PEM format.
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.. attr:: ssl_ca
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**ssl_key**
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An openssl file containing the client private key in PEM format.
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An openssl file containing a set of concatenated “certification
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authority” certificates in PEM formet.
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zookeeper
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"""""""""
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.. attr:: ssl_cert
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An openssl file containing the client public certificate in PEM format.
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.. attr:: ssl_key
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An openssl file containing the client private key in PEM format.
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.. NOTE: this is a white lie at this point, since only the scheduler
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uses this, however, we expect other components to use it later, so
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it's reasonable for admins to plan for this now.
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**hosts**
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A list of zookeeper hosts for Zuul to use when communicating with
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Nodepool::
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.. attr:: zookeeper
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hosts=zk1.example.com,zk2.example.com,zk3.example.com
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Client connection information for ZooKeeper
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.. attr:: hosts
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:required:
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A list of zookeeper hosts for Zuul to use when communicating
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with Nodepool.
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.. _scheduler:
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Scheduler
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---------
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@ -79,85 +105,84 @@ results.
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Configuration
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~~~~~~~~~~~~~
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The following sections of **zuul.conf** are used by the scheduler:
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The following sections of ``zuul.conf`` are used by the scheduler:
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gearman_server
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""""""""""""""
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The builtin gearman server. Zuul can fork a gearman process from itself rather
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than connecting to an external one.
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.. attr:: gearman_server
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**start**
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Whether to start the internal Gearman server (default: False)::
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The builtin gearman server. Zuul can fork a gearman process from
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itself rather than connecting to an external one.
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start=true
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.. attr:: start
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:default: false
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**listen_address**
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IP address or domain name on which to listen (default: all addresses)::
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Whether to start the internal Gearman server.
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listen_address=127.0.0.1
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.. attr:: listen_address
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:default: all addresses
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**log_config**
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Path to log config file for internal Gearman server::
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IP address or domain name on which to listen.
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log_config=/etc/zuul/gearman-logging.yaml
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.. attr:: log_config
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**ssl_ca**
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An openssl file containing a set of concatenated “certification authority”
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certificates in PEM formet.
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Path to log config file for internal Gearman server.
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**ssl_cert**
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An openssl file containing the server public certificate in PEM format.
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.. attr:: ssl_ca
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**ssl_key**
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An openssl file containing the server private key in PEM format.
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An openssl file containing a set of concatenated “certification
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authority” certificates in PEM formet.
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webapp
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""""""
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.. attr:: ssl_cert
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**listen_address**
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IP address or domain name on which to listen (default: 0.0.0.0)::
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An openssl file containing the server public certificate in PEM
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format.
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listen_address=127.0.0.1
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.. attr:: ssl_key
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**port**
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Port on which the webapp is listening (default: 8001)::
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An openssl file containing the server private key in PEM format.
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port=8008
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.. attr:: webapp
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**status_expiry**
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Zuul will cache the status.json file for this many seconds (default: 1)::
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.. attr:: listen_address
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:default: all addresses
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status_expiry=1
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IP address or domain name on which to listen.
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**status_url**
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URL that will be posted in Zuul comments made to changes when
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starting jobs for a change. Used by zuul-scheduler only::
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.. attr:: port
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:default: 8001
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status_url=https://zuul.example.com/status
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Port on which the webapp is listening.
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scheduler
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"""""""""
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.. attr:: status_expiry
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:default: 1
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**tenant_config**
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Path to tenant config file::
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Zuul will cache the status.json file for this many seconds.
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layout_config=/etc/zuul/tenant.yaml
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.. attr:: status_url
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**log_config**
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Path to log config file::
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URL that will be posted in Zuul comments made to changes when
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starting jobs for a change.
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log_config=/etc/zuul/scheduler-logging.yaml
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.. TODO: is this effectively required?
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**pidfile**
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Path to PID lock file::
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.. attr:: scheduler
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pidfile=/var/run/zuul/scheduler.pid
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.. attr:: tenant_config
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:required:
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**state_dir**
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Path to directory that Zuul should save state to::
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Path to :ref:`tenant-config` file.
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state_dir=/var/lib/zuul
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.. attr:: log_config
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Path to log config file.
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.. attr:: pidfile
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Path to PID lock file.
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.. attr:: state_dir
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Path to directory in which Zuul should save its state.
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Operation
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~~~~~~~~~
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@ -169,7 +194,8 @@ Most of Zuul's configuration is automatically updated as changes to
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the repositories which contain it are merged. However, Zuul must be
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explicitly notified of changes to the tenant config file, since it is
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not read from a git repository. To do so, send the scheduler PID
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(saved in the pidfile specified in the configuration) a SIGHUP signal.
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(saved in the pidfile specified in the configuration) a `SIGHUP`
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signal.
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Merger
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------
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@ -20,6 +20,11 @@ Filenames and literal values (such as when we instruct a user to type
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a specific string into a configuration file) should use the RST
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````literal```` syntax.
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YAML supports boolean values expressed with or without an initial
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capital letter. In examples and documentation, use ``true`` and
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``false`` in lowercase type because the resulting YAML is easier for
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users to type and read.
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Terminology
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~~~~~~~~~~~
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