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Installation

Install Zuul

To install a Zuul release from PyPI, run:

pip install zuul

Or from a git checkout, run:

pip install .

That will also install Zuul's python dependencies. To minimize interaction with other python packages installed on a system, you may wish to install Zuul within a Python virtualenv.

Zuul has several system-level dependencies as well. You can find a list of operating system packages in bindep.txt in Zuul's source directory.

External Dependencies

Zuul interacts with several other systems described below.

Gearman

Gearman is a job distribution system that Zuul uses to communicate with its distributed components. The Zuul scheduler distributes work to Zuul mergers and executors using Gearman. You may supply your own gearman server, but the Zuul scheduler includes a built-in server which is recommended. Ensure that all Zuul hosts can communicate with the gearman server.

Zuul distributes secrets to executors via gearman, so be sure to secure it with TLS and certificate authentication. Obtain (or generate) a certificate for both the server and the clients (they may use the same certificate or have individual certificates). They must be signed by a CA, but it can be your own CA.

Nodepool

In order to run all but the simplest jobs, Zuul uses a companion program, Nodepool, to supply the nodes (whether dynamic cloud instances or static hardware) used by jobs. Before starting Zuul, ensure you have Nodepool installed and any images you require built. Zuul only makes one requirement of these nodes: that it be able to log in given a username and ssh private key.

Nodepool uses Zookeeper to communicate internally among its components, and also to communicate with Zuul. You can run a simple single-node Zookeeper instance, or a multi-node cluster. Ensure that the host running the Zuul scheduler has access to the cluster.

Ansible

Zuul uses Ansible to run jobs. Each version of Zuul is designed to work with a specific, contemporary version of Ansible. Zuul specifies that version of Ansible in its python package metadata, and normally the correct version will be installed automatically with Zuul. Because of the close integration of Zuul and Ansible, attempting to use other versions of Ansible with Zuul is not recommended.

Web Deployment Options

The zuul-web service provides an web dashboard, a REST API and a websocket log streaming service as a single holistic web application. For production use it is recommended to run it behind a reverse proxy, such as Apache or Nginx.

More advanced users may desire to do one or more exciting things such as:

White Label: Serve the dashboard of an individual tenant at the root of its own domain. https://zuul.openstack.org is an example of a Zuul dashboard that has been white labeled for the openstack tenant of its Zuul.
Static Offload: Shift the duties of serving static files, such as HTML, Javascript, CSS or images either to the Reverse Proxy server or to a completely separate location such as a Swift Object Store or a CDN-enabled static web server.
Sub-URL: Serve a Zuul dashboard from a location below the root URL as part of presenting integration with other application. https://softwarefactory-project.io/zuul3/ is an example of a Zuul dashboard that is being served from a Sub-URL.

None of those make any sense for simple non-production oriented deployments, so all discussion will assume that the zuul-web service is exposed via a Reverse Proxy. Where rewrite rule examples are given, they will be given with Apache syntax, but any other Reverse Proxy should work just fine.

Basic Reverse Proxy

Using Apache as the Reverse Proxy requires the mod_proxy, mod_proxy_http and mod_proxy_wstunnel modules to be installed and enabled. Static Offload and White Label additionally require mod_rewrite.

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