PuppetDB 5.0: Facts endpoint

This version of PuppetDB is not included in Puppet Enterprise. The latest version of PE includes PuppetDB 4.4.

You can query facts by making an HTTP request to the /facts endpoint.

In Puppet’s world, you only interact with facts from one node at a time, so any given fact consists of only a fact name and a value. But since PuppetDB interacts with a whole population of nodes, each PuppetDB fact also includes a certname and an environment.

/pdb/query/v4/facts

This will return all facts matching the given query. Facts for deactivated nodes are not included in the response.

URL parameters

  • query: optional. A JSON array containing the query in prefix notation (["<OPERATOR>", "<FIELD>", "<VALUE>"]). See the sections below for the supported operators and fields. For general info about queries, see our guide to query structure.

If a query parameter is not provided, all results will be returned.

Query operators

See the AST query language page.

Query fields

  • name (string): the name of the fact.
  • value (string, numeric, Boolean): the value of the fact.
  • certname (string): the node associated with the fact.
  • environment (string): the environment associated with the fact.

Subquery relationships

The following list contains related entities that can be used to constrain the result set using implicit subqueries. For more information, consult the documentation for subqueries.

Response format

Successful responses will be in application/json. Errors will be returned as non-JSON strings.

The result will be a JSON array, with one entry per fact. Each entry is of the form:

{
  "certname": <node name>,
  "name": <fact name>,
  "value": <fact value>,
  "environment": <facts environment>
}

The array is unsorted. Fact values can be strings, floats, integers, Booleans, arrays, or maps. Map and array values can be any of the same types.

If no facts match the query, an empty JSON array will be returned. Querying against value will return matches only at the top level. Hashes and arrays cannot be matched.

Examples

Using curl from localhost:

Get the operatingsystem fact for all nodes:

curl -X GET http://localhost:8080/pdb/query/v4/facts \
  --data-urlencode 'query=["=", "name", "operatingsystem"]'

[{"certname": "a.example.com", "name": "operatingsystem", "value": "Debian"},
 {"certname": "b.example.com", "name": "operatingsystem", "value": "RedHat"},
 {"certname": "c.example.com", "name": "operatingsystem", "value": "Darwin"}]

Get all facts for a single node:

curl -X GET http://localhost:8080/pdb/query/v4/facts \
  --data-urlencode 'query=["=", "certname", "a.example.com"]'

[{"certname": "a.example.com", "name": "operatingsystem", "value": "Debian"},
 {"certname": "a.example.com", "name": "ipaddress", "value": "192.168.1.105"},
 {"certname": "a.example.com", "name": "uptime_days", "value": "26 days"}]

Subquery against /fact-contents to get all remotely authenticated trusted facts:

curl -X GET http://localhost:8080/pdb/query/v4/facts --data-urlencode \
  'query=["in", ["name","certname"],
           ["extract", ["name","certname"],
             ["select_fact_contents",
               ["and", ["=", "path", ["trusted", "authenticated"]],
                       ["=","value","remote"]]]]]]]'

[ {
    "value" : {
        "certname" : "desktop.localdomain",
        "authenticated" : "remote"
    },
    "name" : "trusted",
    "environment" : "production",
    "certname" : "desktop.localdomain"
} ]

Use count and group_by to get tallies of each operating system in your infrastructure:

curl -X GET http://localhost:8080/pdb/query/v4/facts \
  --data-urlencode 'query=["extract", [["function","count"],"value"],
                            ["=","name","operatingsystem"],
                            ["group_by", "value"]]'

[ {
    "value" : "Debian",
    "count" : 67
}, {
    "value" : "CentOS",
    "count" : 33
} ]

Use the avg function and the group_by operator to get the average uptime for your nodes by environment:

curl -X GET http://localhost:8080/pdb/query/v4/facts \
  --data-urlencode 'query=["extract", ["environment",["function","avg","value"]],
                            ["=","name","uptime_hours"],
                            ["group_by", "environment"]]'

[ {
    "environment" : "production",
    "avg" : 116.92774910678841
}, {
    "environment" : "dev",
    "avg" : 271.18281821459045
} ]

/pdb/query/v4/facts/<FACT NAME>

This will return all facts with the given fact name, for all nodes. It behaves exactly like a call to /pdb/query/v4/facts with a query string of ["=", "name", "<FACT NAME>"].

URL parameters / query operators / query fields / response format

This route is an extension of the plain facts endpoint. It uses the exact same parameters, operators, fields, and response format.

If you provide a query parameter, it will specify additional criteria, which will be used to return a subset of the information normally returned by this route.

Examples

Get the operating system fact for all nodes:

curl -X GET http://localhost:8080/pdb/query/v4/facts/operatingsystem

[{"certname": "a.example.com", "name": "operatingsystem", "value": "Debian"},
 {"certname": "b.example.com", "name": "operatingsystem", "value": "Redhat"},
 {"certname": "c.example.com", "name": "operatingsystem", "value": "Ubuntu"}]

Get the partitions fact for a single node:

curl -X GET http://localhost:8080/pdb/query/v4/facts/partitions \
  --data-urlencode 'query=["=", "certname", "a.example.com"]'

[ {
  "value" : {
    "sda3" : {
      "size" : "174389248",
      "mount" : "/home",
      "uuid" : "26d79d9a-96b3-4cc7-960d-0d6558d7dc54"
    },
    "sda1" : {
      "size" : "1048576",
      "mount" : "/boot"
    },
    "sda2" : {
      "mount" : "/",
      "size" : "74629120",
      "uuid" : "30d0108f-ec67-4557-8331-09ebc8b937f9"
    }
  },
  "name" : "partitions",
  "environment" : "production",
  "certname" : "a.example.com"
} ]

/pdb/query/v4/facts/<FACT NAME>/<VALUE>

This will return all facts with the given fact name and value, for all nodes. (That is, only the certname field will differ in each result.) It behaves exactly like a call to /pdb/query/v4/facts with a query string of:

["and",
    ["=", "name", "<FACT NAME>"],
    ["=", "value", "<VALUE>"]]

URL parameters / query operators / query fields / response format

This route is an extension of the plain facts endpoint. It uses the same parameters, operators, fields, and response format.

If you provide a query parameter, it will specify additional criteria, which will be used to return a subset of the information normally returned by this route.

Examples

curl -X GET http://localhost:8080/pdb/query/v4/facts/operatingsystem/Debian

[{"certname": "a.example.com", "name": "operatingsystem", "value": "Debian"},
 {"certname": "b.example.com", "name": "operatingsystem", "value": "Debian}]

Paging

The v4 /facts endpoint does not allow ordering by fact value, but otherwise supports the common PuppetDB paging URL parameters. For more information, please see the documentation on paging. Ordering by value is supported on the fact-contents endpoint.

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