diff --git a/docs/configuring-playbook-prometheus-postgres.md b/docs/configuring-playbook-prometheus-postgres.md new file mode 100644 index 000000000..9a6312968 --- /dev/null +++ b/docs/configuring-playbook-prometheus-postgres.md @@ -0,0 +1,29 @@ +# Enabling metrics and graphs for Postgres (optional) + +Expanding on the metrics exposed by the [syapse exporter and the node exporter](configuring-playbook-prometheus-grafana.md), the playbook enables the [postgres exporter](https://github.com/prometheus-community/postgres_exporter) that exposes more detailed information about what's happening on your postgres database. + +You can enable this with the following settings in your configuration file (`inventory/host_vars/matrix./vars.yml`): + + +```yaml +matrix_prometheus_postgres_exporter_enabled: true + +# the role creates a postgres user as credential. You can configure these if required: +matrix_prometheus_postgres_exporter_database_username: 'matrix_prometheus_postgres_exporter' +matrix_prometheus_postgres_exporter_database_password: 'some-password' + +``` + +## What does it do? + +Name | Description +-----|---------- +`matrix_prometheus_postgres_exporter_enabled`|Enable the postgres prometheus exporter. This sets up the docker container, connects it to the database and adds a 'job' to the prometheus config which tells prometheus about this new exporter. The default is 'false' +`matrix_prometheus_postgres_exporter_database_username`| The 'username' for the user that the exporter uses to connect to the database. The default is 'matrix_prometheus_postgres_exporter' +`matrix_prometheus_postgres_exporter_database_password`| The 'username' for the user that the exporter uses to connect to the database. + + +## More information + +- [The PostgresSQL dashboard](https://grafana.com/grafana/dashboards/9628) (generic postgres dashboard) + diff --git a/group_vars/matrix_servers b/group_vars/matrix_servers index 86f1d5a36..96b933f35 100755 --- a/group_vars/matrix_servers +++ b/group_vars/matrix_servers @@ -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 diff --git a/roles/matrix-grafana/tasks/setup.yml b/roles/matrix-grafana/tasks/setup.yml index c2eea3485..00d2e230d 100644 --- a/roles/matrix-grafana/tasks/setup.yml +++ b/roles/matrix-grafana/tasks/setup.yml @@ -64,7 +64,7 @@ mode: 0440 owner: "{{ matrix_user_username }}" group: "{{ matrix_user_groupname }}" - with_items: "{{ matrix_grafana_dashboard_download_urls }}" + with_items: "{{ matrix_grafana_dashboard_download_urls_all }}" when: matrix_grafana_enabled|bool - name: Ensure matrix-grafana.service installed diff --git a/roles/matrix-prometheus-postgres-exporter/defaults/main.yml b/roles/matrix-prometheus-postgres-exporter/defaults/main.yml new file mode 100644 index 000000000..8aca45762 --- /dev/null +++ b/roles/matrix-prometheus-postgres-exporter/defaults/main.yml @@ -0,0 +1,49 @@ +# matrix-prometheus-postgres-exporter is an Prometheus exporter for postgres metrics +# See: https://github.com/prometheus-community/postgres_exporter + +matrix_prometheus_postgres_exporter_enabled: false + +matrix_prometheus_postgres_exporter_version: v0.9.0 +matrix_prometheus_postgres_exporter_port: 9187 + +matrix_prometheus_postgres_exporter_docker_image: "quay.io/prometheuscommunity/postgres-exporter:{{ matrix_prometheus_postgres_exporter_version }}" +matrix_prometheus_postgres_exporter_docker_image_force_pull: "{{ matrix_prometheus_postgres_exporter_docker_image.endswith(':latest') }}" + +# A list of extra arguments to pass to the container +matrix_prometheus_postgres_exporter_container_extra_arguments: ["-e PG_EXPORTER_AUTO_DISCOVER_DATABASES=true", + "-e PG_EXPORTER_WEB_LISTEN_ADDRESS=\":{{matrix_prometheus_postgres_exporter_port}}\"", + "-e DATA_SOURCE_NAME=\"postgresql://{{matrix_prometheus_postgres_exporter_database_username}}:{{matrix_prometheus_postgres_exporter_database_password}}@{{matrix_prometheus_postgres_exporter_database_hostname}}:5432/{{matrix_prometheus_postgres_exporter_database_name}}?sslmode=disable\"" ] + +# List of systemd services that matrix-prometheus-postgres-exporter.service depends on +matrix_prometheus_postgres_exporter_systemd_required_services_list: ['docker.service'] + +# List of systemd services that matrix-prometheus-postgres-exporter.service wants +matrix_prometheus_postgres_exporter_systemd_wanted_services_list: [] + +# details for connecting to the database +matrix_prometheus_postgres_exporter_database_username: 'matrix_prometheus_postgres_exporter' +matrix_prometheus_postgres_exporter_database_password: 'some-password' +matrix_prometheus_postgres_exporter_database_hostname: 'matrix-postgres' +matrix_prometheus_postgres_exporter_database_port: 5432 +matrix_prometheus_postgres_exporter_database_name: 'matrix_prometheus_postgres_exporter' + + +# Controls whether the matrix-prometheus container exposes its HTTP port (tcp/9100 in the container). +# +# Takes an ":" value (e.g. "127.0.0.1:9100"), or empty string to not expose. +# +# Official recommendations are to run this container with `--net=host`, +# but we don't do that, since it: +# - likely exposes the metrics web server way too publicly (before applying https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/1008) +# - or listens on a loopback interface only (--net=host and 127.0.0.1:9100), which is not reachable from another container (like `matrix-prometheus`) +# +# Using `--net=host` and binding to Docker's `matrix` bridge network may be a solution to both, +# but that's trickier to accomplish and won't necessarily work (hasn't been tested). +# +# Not using `--net=host` means that our network statistic reports are likely broken (inaccurate), +# because node-exporter can't see all interfaces, etc. +# For now, we'll live with that, until someone develops a better solution. +matrix_prometheus_postgres_exporter_container_http_host_bind_port: '' + +matrix_prometheus_postgres_exporter_dashboard_urls: +- "https://grafana.com/api/dashboards/9628/revisions/7/download" \ No newline at end of file diff --git a/roles/matrix-prometheus-postgres-exporter/tasks/init.yml b/roles/matrix-prometheus-postgres-exporter/tasks/init.yml new file mode 100644 index 000000000..2bd6904ec --- /dev/null +++ b/roles/matrix-prometheus-postgres-exporter/tasks/init.yml @@ -0,0 +1,5 @@ +- set_fact: + matrix_systemd_services_list: "{{ matrix_systemd_services_list + ['matrix-prometheus-postgres-exporter.service'] }}" + when: matrix_prometheus_postgres_exporter_enabled|bool + + diff --git a/roles/matrix-prometheus-postgres-exporter/tasks/main.yml b/roles/matrix-prometheus-postgres-exporter/tasks/main.yml new file mode 100644 index 000000000..e3c364fa9 --- /dev/null +++ b/roles/matrix-prometheus-postgres-exporter/tasks/main.yml @@ -0,0 +1,8 @@ +- import_tasks: "{{ role_path }}/tasks/init.yml" + tags: + - always + +- import_tasks: "{{ role_path }}/tasks/setup.yml" + tags: + - setup-all + - setup-prometheus-postgres-exporter diff --git a/roles/matrix-prometheus-postgres-exporter/tasks/setup.yml b/roles/matrix-prometheus-postgres-exporter/tasks/setup.yml new file mode 100644 index 000000000..076ece1a8 --- /dev/null +++ b/roles/matrix-prometheus-postgres-exporter/tasks/setup.yml @@ -0,0 +1,54 @@ +--- + +# +# Tasks related to setting up matrix-prometheus-postgres-exporter +# + +- name: Ensure matrix-prometheus-postgres-exporter image is pulled + docker_image: + name: "{{ matrix_prometheus_postgres_exporter_docker_image }}" + source: "{{ 'pull' if ansible_version.major > 2 or ansible_version.minor > 7 else omit }}" + force_source: "{{ matrix_prometheus_postgres_exporter_docker_image_force_pull if ansible_version.major > 2 or ansible_version.minor >= 8 else omit }}" + force: "{{ omit if ansible_version.major > 2 or ansible_version.minor >= 8 else matrix_prometheus_postgres_exporter_docker_image_force_pull }}" + when: "matrix_prometheus_postgres_exporter_enabled|bool" + +- name: Ensure matrix-prometheus-postgres-exporter.service installed + template: + src: "{{ role_path }}/templates/systemd/matrix-prometheus-postgres-exporter.service.j2" + dest: "{{ matrix_systemd_path }}/matrix-prometheus-postgres-exporter.service" + mode: 0644 + register: matrix_prometheus_postgres_exporter_systemd_service_result + when: matrix_prometheus_postgres_exporter_enabled|bool + +- name: Ensure systemd reloaded after matrix-prometheus.service installation + service: + daemon_reload: yes + when: "matrix_prometheus_postgres_exporter_enabled|bool and matrix_prometheus_postgres_exporter_systemd_service_result.changed" + +# +# Tasks related to getting rid of matrix-prometheus-postgres-exporter (if it was previously enabled) +# + +- name: Check existence of matrix-prometheus-postgres-exporter service + stat: + path: "{{ matrix_systemd_path }}/matrix-prometheus-postgres-exporter.service" + register: matrix_prometheus_postgres_exporter_service_stat + +- name: Ensure matrix-prometheus-postgres-exporter is stopped + service: + name: matrix-prometheus-postgres-exporter + state: stopped + daemon_reload: yes + register: stopping_result + when: "not matrix_prometheus_postgres_exporter_enabled|bool and matrix_prometheus_postgres_exporter_service_stat.stat.exists" + +- name: Ensure matrix-prometheus-postgres-exporter.service doesn't exist + file: + path: "{{ matrix_systemd_path }}/matrix-prometheus-postgres-exporter.service" + state: absent + when: "not matrix_prometheus_postgres_exporter_enabled|bool and matrix_prometheus_postgres_exporter_service_stat.stat.exists" + +- name: Ensure systemd reloaded after matrix-prometheus-postgres-exporter.service removal + service: + daemon_reload: yes + when: "not matrix_prometheus_postgres_exporter_enabled|bool and matrix_prometheus_postgres_exporter_service_stat.stat.exists" diff --git a/roles/matrix-prometheus-postgres-exporter/templates/systemd/matrix-prometheus-postgres-exporter.service.j2 b/roles/matrix-prometheus-postgres-exporter/templates/systemd/matrix-prometheus-postgres-exporter.service.j2 new file mode 100644 index 000000000..b25cb5ded --- /dev/null +++ b/roles/matrix-prometheus-postgres-exporter/templates/systemd/matrix-prometheus-postgres-exporter.service.j2 @@ -0,0 +1,42 @@ +#jinja2: lstrip_blocks: "True" +[Unit] +Description=matrix-prometheus-postgres-exporter +{% for service in matrix_prometheus_postgres_exporter_systemd_required_services_list %} +Requires={{ service }} +After={{ service }} +{% endfor %} +{% for service in matrix_prometheus_postgres_exporter_systemd_wanted_services_list %} +Wants={{ service }} +{% endfor %} +DefaultDependencies=no + +[Service] +Type=simple +Environment="HOME={{ matrix_systemd_unit_home_path }}" +ExecStartPre=-{{ matrix_host_command_sh }} -c '{{ matrix_host_command_docker }} kill matrix-prometheus-postgres-exporter 2>/dev/null' +ExecStartPre=-{{ matrix_host_command_sh }} -c '{{ matrix_host_command_docker }} rm matrix-prometheus-postgres-exporter 2>/dev/null' + + +ExecStart={{ matrix_host_command_docker }} run --rm --name matrix-prometheus-postgres-exporter \ + --log-driver=none \ + --user={{ matrix_user_uid }}:{{ matrix_user_gid }} \ + --cap-drop=ALL \ + --read-only \ + {% for arg in matrix_prometheus_postgres_exporter_container_extra_arguments %} + {{ arg }} \ + {% endfor %} + --network={{ matrix_docker_network }} \ + {% if matrix_prometheus_postgres_exporter_container_http_host_bind_port %} + -p {{ matrix_prometheus_postgres_exporter_container_http_host_bind_port }}:{{matrix_prometheus_postgres_exporter_port}} \ + {% endif %} + --pid=host \ + {{ matrix_prometheus_postgres_exporter_docker_image }} + +ExecStop=-{{ matrix_host_command_sh }} -c '{{ matrix_host_command_docker }} kill matrix-prometheus-postgres-exporter 2>/dev/null' +ExecStop=-{{ matrix_host_command_sh }} -c '{{ matrix_host_command_docker }} rm matrix-prometheus-postgres-exporter 2>/dev/null' +Restart=always +RestartSec=30 +SyslogIdentifier=matrix-prometheus-postgres-exporter + +[Install] +WantedBy=multi-user.target diff --git a/roles/matrix-prometheus/templates/prometheus.yml.j2 b/roles/matrix-prometheus/templates/prometheus.yml.j2 index 9502a08b6..b3ee3b86e 100644 --- a/roles/matrix-prometheus/templates/prometheus.yml.j2 +++ b/roles/matrix-prometheus/templates/prometheus.yml.j2 @@ -38,3 +38,9 @@ scrape_configs: static_configs: - targets: {{ matrix_prometheus_scraper_node_targets|to_json }} {% endif %} + + {% if matrix_prometheus_scraper_postgres_enabled %} + - job_name: postgres + static_configs: + - targets: {{ matrix_prometheus_scraper_postgres_targets|to_json }} + {% endif %} \ No newline at end of file diff --git a/setup.yml b/setup.yml index 9e3cd6254..142364c46 100755 --- a/setup.yml +++ b/setup.yml @@ -54,5 +54,5 @@ - matrix-coturn - matrix-aux - matrix-postgres-backup - - matrix-common-after - + - matrix-prometheus-postgres-exporter + - matrix-common-after \ No newline at end of file