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Add support for a prometheus postgres exporter

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This commit introduces a new role that downloads and installs the
prometheus community postgres exporter  https://github.com/prometheus-community/postgres_exporter.
A new credential is added to matrix_postgres_additional_databases that
allows the exporter access to the database to gather statistics.
A new dashboard was added to the grafana role, with some refactoring
to enable the dashboard only if the new role is enabled.
I've included some basic instructions for how to enable the role in
the Docs section.

In terms of testing, I've tested enabling the role, and disabling
it to make sure it cleans up the container and systemd role.
This commit is contained in:
Raymond Coetzee
2021-05-27 20:13:29 +01:00
parent 1cb6a0c96f
commit 4e2780ff88
10 changed files with 236 additions and 3 deletions
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40
group_vars/matrix_servers
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@ -1466,6 +1466,13 @@ matrix_postgres_additional_databases: |
'username': matrix_sygnal_database_username,
'password': matrix_sygnal_database_password,
}] if (matrix_sygnal_enabled and matrix_sygnal_database_engine == 'postgres' and matrix_sygnal_database_hostname == 'matrix-postgres') else [])
+
([{
'name': matrix_prometheus_postgres_exporter_database_name,
'username': matrix_prometheus_postgres_exporter_database_username,
'password': matrix_prometheus_postgres_exporter_database_password,
}] if (matrix_prometheus_postgres_exporter_enabled and matrix_prometheus_postgres_exporter_database_hostname == 'matrix-postgres') else [])
}}
matrix_postgres_import_roles_to_ignore: |
@ -1766,6 +1773,10 @@ matrix_prometheus_scraper_synapse_rules_synapse_tag: "{{ matrix_synapse_docker_i
matrix_prometheus_scraper_node_enabled: "{{ matrix_prometheus_node_exporter_enabled }}"
matrix_prometheus_scraper_node_targets: "{{ ['matrix-prometheus-node-exporter:9100'] if matrix_prometheus_node_exporter_enabled else [] }}"
matrix_prometheus_scraper_postgres_enabled: "{{ matrix_prometheus_postgres_exporter_enabled }}"
matrix_prometheus_scraper_postgres_targets: "{{ ['matrix-prometheus-postgres-exporter:'+ matrix_prometheus_postgres_exporter_port|string] if matrix_prometheus_scraper_postgres_enabled else [] }}"
######################################################################
#
# /matrix-prometheus
@ -1773,6 +1784,27 @@ matrix_prometheus_scraper_node_targets: "{{ ['matrix-prometheus-node-exporter:91
######################################################################
######################################################################
#
# matrix-prometheus-postgres-exporter
#
######################################################################
matrix_prometheus_postgres_exporter_enabled: false
matrix_prometheus_postgres_exporter_database_password: "{{ matrix_synapse_macaroon_secret_key | password_hash('sha512', 'prometheus.pg.db') | to_uuid }}"
matrix_prometheus_postgres_exporter_systemd_required_services_list: |
{{
['docker.service']
+
(['matrix-postgres.service'] if matrix_postgres_enabled else [])
}}
######################################################################
#
# /matrix-prometheus-postgres-exporter
#
######################################################################
######################################################################
#
@ -1787,6 +1819,14 @@ matrix_grafana_enabled: false
# Grafana's HTTP port to the local host.
matrix_grafana_container_http_host_bind_port: "{{ '' if matrix_nginx_proxy_enabled else '127.0.0.1:3000' }}"
matrix_grafana_dashboard_download_urls_all: |
{{
matrix_grafana_dashboard_download_urls
+
(matrix_prometheus_postgres_exporter_dashboard_urls if matrix_prometheus_postgres_exporter_enabled else [])
}}
######################################################################
#
# /matrix-grafana