PuppetDB 1.5 » API » v3 » Query Structure
Included in Puppet Enterprise 3.2. A newer version is available; see the version menu above for details.
PuppetDB’s query API can retrieve data objects from PuppetDB for use in other applications. For example, the terminus plugins for puppet masters use this API to collect exported resources, and to translate node facts into the inventory service.
The query API is implemented as HTTP URLs on the PuppetDB server. By default, it can only be accessed over the network via host-verified HTTPS; see the jetty settings if you need to access the API over unencrypted HTTP.
The first component of an API URL is the API version, written as
v3, etc. This page describes version 2 of the API, so every URL will begin with
/v3. After the version, URLs are organized into a number of endpoints.
Conceptually, an endpoint represents a reservoir of some type of PuppetDB object. Each version of the PuppetDB API defines a set number of endpoints.
See the API index for a list of the available endpoints. Each endpoint may have additional sub-endpoints under it; these are generally just shortcuts for the most common types of query, so that you can write terser and simpler query strings.
Most PuppetDB query endpoints support paged results via the common PuppetDB paging query parameters. For more information, please see the documentation on paging.
A query consists of:
- An HTTP GET request to an endpoint URL…
- …which may or may not contain a query string as a
That is, nearly every query will look like a GET request to a URL that resembles the following:
Query strings are optional for some endpoints, required for others, and prohibited for others; see each endpoint’s documentation.
A query string must be:
- A URL-encoded…
- …JSON array, which may contain scalar data types (usually strings) and additional arrays…
- …which describes a complex comparison operation…
- …in prefix notation.
JSON arrays are delimited by square brackets (
]), and items in the array are separated by commas. JSON strings are delimited by straight double-quotes (
") and must be UTF-8 text; literal double quotes and literal backslashes in the string must be escaped with a backslash (
“Prefix notation” means every array in a query string must begin with an operator, and the remaining elements in the array will be interpreted as that operator’s arguments, in order. (The similarity to Lisp is intentional.)
A complete query string describes a comparison operation. When submitting a query, PuppetDB will check every possible result from the endpoint to see if it matches the comparison from the query string, and will only return those objects that match.
For a more complete description of how to construct query strings, see the Operators page.
All queries return data with a content type of