promtail

Deploy and configure Grafana's Promtail

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Module Stats

25,989 downloads

14,871 latest version

5.0 quality score

Version information

released Aug 31st 2021

This version is compatible with:

Puppet Enterprise 2023.2.x, 2023.1.x, 2023.0.x, 2021.7.x, 2021.6.x, 2021.5.x, 2021.4.x, 2021.3.x, 2021.2.x, 2021.1.x, 2021.0.x, 2019.8.x, 2019.7.x, 2019.5.x, 2019.4.x, 2019.3.x, 2019.2.x, 2019.1.x
Puppet >= 6.1.0 < 8.0.0
, , , , ,

Start using this module

Installation method

Add this module to your Puppetfile:

mod 'grafana-promtail', '2.1.0'

Learn more about managing modules with a Puppetfile

Add this module to your Bolt project:

bolt module add grafana-promtail

Learn more about using this module with an existing project

Manually install this module globally with Puppet module tool:

puppet module install grafana-promtail --version 2.1.0

Documentation

grafana/promtail — version 2.1.0 Aug 31st 2021

Promtail

Deploy and configure Grafana's Promtail on a node.

Description
Usage
Reference
Changelog
Limitations
Development
Module Release

Description

Promtail is an agent which ships the contents of local logs to a private Loki instance or Grafana Cloud. It is usually deployed to every machine that has applications needed to be monitored.

It primarily:

Discovers targets
Attaches labels to log streams
Pushes them to the Loki instance.

Currently, Promtail can tail logs from two sources: local log files and the systemd journal (on AMD64 machines only).

Usage

The simplest way to get started with this module is to add include promtail to a manifest and create your config settings in Hiera. Additional details and examples are contained in REFERENCE.md.

Reference

This module is documented via pdk bundle exec puppet strings generate --format markdown. Please see REFERENCE.md for more info.

Changelog

CHANGELOG.md is generated prior to each release via pdk bundle exec rake changelog. This process relies on labels that are applied to each pull request.

Limitations

At the moment, this module only supports Linux. Future versions will support additional OS's including Windows.

Development

Pull requests are welcome! A Vagrantfile is also included in this repository that can be used during development.

Module Release

Follow the steps below to tag a new release and push to The Forge using GitHub Actions.

Ensure that all closed PRs are labeled appropriately.
Create a "Release Prep" PR with the label "maintenance" containing changes made by the following:
1. Bump the module version (X.Y.Z) in metadata.json as appropriate based on closed PRs since the previous release. (i.e. "backwards-incomptible" is an X "release", "feature" is a Y release, and "bugfix" is a Z release)
2. Run pdk bundle exec puppet strings generate --format markdown. Any missing documentation will result in a failed pipeline.
3. Run pdk bundle exec rake changelog. Any unlabeled PRs will result in a failed pipeline.
Once the PR is merged, navigate to Actions --> Publish Module --> Run workflow --> select the main branch, and Run workflow.

Reference

Classes

Public Classes

promtail: promtail's main interface. All interactions should be with this class.

Private Classes

promtail::config: Creates files and folders associated with promtail's config
promtail::install: Installs promtail
promtail::service: Creates a service defintion for promtail

Functions

promtail::strip_yaml_header: A function to strip the --- from the beginning of a string
promtail::to_yaml: A function to convert a hash into yaml for the promtail config

Classes

`promtail`

promtail's main interface. All interactions should be with this class. The promtail module is intended to install and configure Grafana's promtail tool for shipping logs to Loki.

Examples

include promtail

Sample of defining within a profile

class { 'promtail':
  clients_config_hash   => $clients_config_hash,
  positions_config_hash => $positions_config_hash,
  scrape_configs_hash   => $_real_scrape_configs_hash,
  password_file_content => $sensitive_password_file_content,
  password_file_path    => $password_file_path,
  service_ensure        => $service_ensure,
  server_config_hash    => $server_config_hash,
  target_config_hash    => $target_config_hash,
  bin_dir               => $bin_dir,
  checksum              => $checksum,
  version               => $version,
}

Settings in a Hiera file

---
promtail::password_file_path: '/etc/promtail/.gc_pw'
promtail::password_file_content: ENC[PKCS7,MIIBasdfasdfasdfasdfasdfasdf==]
promtail::server_config_hash:
  server:
    http_listen_port: 9274
    grpc_listen_port: 0
promtail::clients_config_hash:
  clients:
    - url: 'https://logs-us-west1.grafana.net/api/prom/push'
      basic_auth:
        username: '1234'
        password_file: '/etc/promtail/.gc_pw'
promtail::positions_config_hash:
  positions:
    filename: /tmp/positions.yaml
promtail::scrape_configs_hash:
  scrape_configs:
    - job_name: journal
      journal:
        max_age: 12h
        labels:
          job: systemd-journal
          host: "%{facts.networking.fqdn}"
      relabel_configs:
        - source_labels:
            - '__journal__systemd_unit'
          target_label: 'unit'
        - source_labels:
            - 'unit'
          regex: "session-(.*)"
          action: replace
          replacement: 'pam-session'
          target_label: 'unit'

Merging scrape configs in Hiera

class profile::logging::promtail {
  $_real_scrape_configs_hash = lookup('promtail_scrape_configs_hash', {merge => 'deep'})
  class { 'promtail':
    scrape_configs_hash => $_real_scrape_configs_hash,
  }
}

Parameters

The following parameters are available in the promtail class:

service_enable
service_ensure
clients_config_hash
positions_config_hash
scrape_configs_hash
bin_dir
checksum
version
server_config_hash
target_config_hash
password_file_path
password_file_content
source_url

`service_enable`

Data type: Boolean

The value passed to the service resource's enable parameter for promtail's service

`service_ensure`

Data type: Enum['running', 'stopped']

The value passed to the service resource's ensure parameter for promtail's service

`clients_config_hash`

Data type: Hash

Describes how Promtail connects to multiple instances of Loki, sending logs to each. See https://github.com/grafana/loki/blob/master/docs/clients/promtail/configuration.md for all parameters.

`positions_config_hash`

Data type: Hash

Describes how to save read file offsets to disk. See https://github.com/grafana/loki/blob/master/docs/clients/promtail/configuration.md for all parameters.

`scrape_configs_hash`

Data type: Hash

Each scrape_config block configures how Promtail can scrape logs from a series of targets using a specified discovery method. See https://github.com/grafana/loki/blob/master/docs/clients/promtail/configuration.md for all parameters.

`bin_dir`

Data type: Stdlib::Absolutepath

The directory in which to create a symlink to the promtail binary

`checksum`

Data type: String[1]

The checksum of the promtail binary. Note: each platform has its own checksum. Values can be found with each release on GitHub

`version`

Data type: String[1]

The version as listed on the GitHub release page See https://github.com/grafana/loki/releases for a list

`server_config_hash`

Data type: Optional[Hash]

Configures Promtail's behavior as an HTTP server. Defaults will be used if this block is omitted. See https://github.com/grafana/loki/blob/master/docs/clients/promtail/configuration.md for all parameters.

Default value: undef

`target_config_hash`

Data type: Optional[Hash]

Configures how tailed targets will be watched. Defaults will be used if this block is omitted. See https://github.com/grafana/loki/blob/master/docs/clients/promtail/configuration.md for all parameters.

Default value: undef

`password_file_path`

Data type: Optional[Stdlib::Absolutepath]

The fully qualified path to the file containing the password used for basic auth

Default value: undef

`password_file_content`

Data type: Optional[Sensitive[String[1]]]

The value to be placed in the password file. This value is cast to Sensitive via lookup_options defined in data/common.yaml

Default value: undef

`source_url`

Data type: Stdlib::HTTPUrl

The URL from which promtail packages can be downloaded

Default value: 'https://github.com/grafana/loki/releases/download'

Functions

`promtail::strip_yaml_header`

Type: Ruby 4.x API

A function to strip the --- from the beginning of a string

Examples

concat::fragment { 'server_config_hash':
  target  => $config_file,
  content => $promtail::server_config_hash.promtail::to_yaml.promtail::strip_yaml_header,
  order   => '10',
}

`promtail::strip_yaml_header(String $yaml_string)`

A function to strip the --- from the beginning of a string

Returns: String Returns the string with the leading header stripped off

Examples

concat::fragment { 'server_config_hash':
  target  => $config_file,
  content => $promtail::server_config_hash.promtail::to_yaml.promtail::strip_yaml_header,
  order   => '10',
}

`yaml_string`

Data type: String

A string that may start with the ---'s used to denote a YAML file

`promtail::to_yaml`

Type: Ruby 4.x API

A function to convert a hash into yaml for the promtail config

Examples

promtail::to_yaml($promtail::config_hash)

`promtail::to_yaml(Hash $config_hash)`

A function to convert a hash into yaml for the promtail config

Returns: String Returns the YAML version of the hash as a string

Examples

promtail::to_yaml($promtail::config_hash)

`config_hash`

Data type: Hash

A Puppet hash to be converted into YAML

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promtail

Version information

This version is compatible with:

Start using this module

Documentation

Promtail

Description

Usage

Reference

Changelog

Limitations

Development

Module Release

Reference

Table of Contents

Classes

Public Classes

Private Classes

Functions

Classes

promtail

Examples

Sample of defining within a profile

Settings in a Hiera file

Merging scrape configs in Hiera

Parameters

service_enable

service_ensure

clients_config_hash

positions_config_hash

scrape_configs_hash

bin_dir

checksum

version

server_config_hash

target_config_hash

password_file_path

password_file_content

source_url

Functions

promtail::strip_yaml_header

Examples

promtail::strip_yaml_header(String $yaml_string)

Examples

yaml_string

promtail::to_yaml

Examples

promtail::to_yaml(Hash $config_hash)

Examples

config_hash

Change log

2.1.0 (2021-08-31)

Added

2.0.0 (2021-07-30)

Changed

Added

1.0.0 (2020-11-02)

Added

Fixed

0.3.1 (2020-01-13)

0.3.0 (2020-01-13)

0.2.0 (2019-12-12)

Fixed

0.1.0 (2019-10-25)

Dependencies

`promtail`

`service_enable`

`service_ensure`

`clients_config_hash`

`positions_config_hash`

`scrape_configs_hash`

`bin_dir`

`checksum`

`version`

`server_config_hash`

`target_config_hash`

`password_file_path`

`password_file_content`

`source_url`

`promtail::strip_yaml_header`

`promtail::strip_yaml_header(String $yaml_string)`

`yaml_string`

`promtail::to_yaml`

`promtail::to_yaml(Hash $config_hash)`

`config_hash`