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Project YAML

The rill.yaml file contains metadata about your project.


title — the name of your project which will be displayed in the upper left hand corner compiler — the Rill project compiler version compatible with your project files (currently defaults to: rillv1) olap_connector - the default OLAP engine to use in your project mock_users — a list of mock users to test against dashboard security policies. For each mock user, possible attributes include:

  • email — the mock user's email (required)
  • name — the mock user's name
  • admin — whether or not the mock user is an admin

Configuring the default OLAP Engine

Rill allows you to specify the default OLAP engine to use in your project via rill.yaml. This setting is configurable using the olap_connector property (and will otherwise revert to duckdb if not specified).

Curious about OLAP Engines?

Please see our reference documentation on OLAP Engines.

Project-wide defaults

In rill.yaml, project-wide defaults can be specified for a resource type within a project. Unless otherwise specified, individual resources will inherit any defaults that have been specified in rill.yaml. For available properties that can be configured, please refer to the YAML specification for each individual resource type - sources, models, and dashboards

Use plurals when specifying project-wide defaults

In your rill.yaml, the top level property for the resource type needs to be plural, such as sources, models, and dashboards.

For example, the following YAML configuration below will set a project-wide default for:

  • Sources - Configure a source refresh.
  • Models - Automatically materialize the models as tables instead of views (the default behavior if unspecified).
  • Dashboards - Set the first day of the week for timeseries aggregations to be Sunday along with defining available timezones on a dashboard.
title: My Rill Project
cron: '0 * * * *'
materialize: true
first_day_of_week: 7
- America/Los_Angeles
- America/New_York
- Europe/London
- Asia/Kolkata
Hierarchy of inheritance and property overrides

As a general rule of thumb, properties that have been specified at a more granular level will supercede or override higher level properties that have been inherited. Therefore, in order of inheritance, Rill will prioritize properties in the following order:

  1. Individual source/model/dashboard object level properties (e.g. source.yaml or dashboard.yaml)
  2. Environment level properties (e.g. a specific property that have been set for dev)
  3. Project-wide defaults for a specific property and resource type

Setting variables

Primarily useful for templating, variables can be set in the rill.yaml file directly. This allows variables to be set for your projects deployed to Rill Cloud while still being able to use different variable values locally if you prefer.

To define a variable in rill.yaml, pass in the appropriate key-value pair for the variable under the vars key:

numeric_var: 10
string_var: "string_value"
Overriding variables locally

Variables also follow an order of precedence and can be overriden locally. By default, any variables defined will be inherited from rill.yaml. However, if you manually pass in a variable when starting Rill Developer locally via the CLI, this value will be used instead for the current instance of your running project:

rill start --var numeric_var=100 --var string_var="different_value"
Setting variables through .env

Variables can also be set through your project's <RILL_PROJECT_HOME>/.env file (or using the rill env set CLI command), such as:


Similar to how connector credentials can be pushed / pulled from local to cloud or vice versa, project variables set locally in Rill Developer can be pushed to Rill Cloud and/or pulled back to your local instance from your deployed project by using the rill env push and rill env pull commands respectively.