Ansible Role: node exporter

Description

Deploy prometheus node exporter using ansible.

Requirements

• Ansible >= 2.5 (It might work on previous versions, but we cannot guarantee it)
• gnu-tar on Mac deployer host (brew install gnu-tar)

Role Variables

All variables which can be overridden are stored in defaults/main.yml file as well as in table below.

Name	Default Value	Description
file_server	https://github.com/prometheus/node_exporter/releases/download	Location of the release artifacts. Required artifacts as hosted here, should be available on the custom file server under v<version_number> directory.
node_exporter_version	0.17.0	Node exporter package version. Also accepts latest as parameter.
node_exporter_web_listen_address	"0.0.0.0:9100"	Address on which node exporter will listen
node_exporter_system_group	"node-exp"	System group used to run node_exporter
node_exporter_system_user	"node-exp"	System user used to run node_exporter
node_exporter_enabled_collectors	[ systemd, textfile ]	List of additionally enabled collectors. It adds collectors to those enabled by default
node_exporter_disabled_collectors	[]	List of disabled collectors. By default node_exporter disables collectors listed here.
node_exporter_textfile_dir	"/var/lib/node_exporter"	Directory used by the Textfile Collector. To get permissions to write metrics in this directory, users must be in node-exp system group.

Example

Playbook

Use it in a playbook as follows:

- hosts: all
  roles:
    - cloudalchemy.node-exporter

Demo site

We provide demo site for full monitoring solution based on prometheus and grafana. Repository with code and links to running instances is available on github and site is hosted on DigitalOcean.

Local Testing

The preferred way of locally testing the role is to use Docker and molecule (v2.x). You will have to install Docker on your system. See "Get started" for a Docker package suitable to for your system. We are using tox to simplify process of testing on multiple ansible versions. To install tox execute:

pip install tox

To run tests on all ansible versions (WARNING: this can take some time)

tox

To run a custom molecule command on custom environment with only default test scenario:

tox -e py27-ansible25 -- molecule test -s default

For more information about molecule go to their docs.

If you would like to run tests on remote docker host just specify DOCKER_HOST variable before running tox tests.

Travis CI

Combining molecule and travis CI allows us to test how new PRs will behave when used with multiple ansible versions and multiple operating systems. This also allows use to create test scenarios for different role configurations. As a result we have a quite large test matrix which will take more time than local testing, so please be patient.

Contributing

See contributor guideline.

License

This project is licensed under MIT License. See LICENSE for more details.