[postgres+mariadb] Add Prometheus exporter

Signed-off-by: Yohann D'ANELLO <ynerant@crans.org>

group_vars/mariadb.yml

@@ -0,0 +1,3 @@
+---
+glob_prometheus_mysqld_exporter:
+  listen_addr: "{{ query('ldap', 'ip', ansible_hostname, 'adm') | ansible.utils.ipv4 | first }}"

group_vars/postfix.yml

@@ -0,0 +1,3 @@
+---
+glob_prometheus_postfix_exporter:
+  listen_addr: "{{ query('ldap', 'ip', ansible_hostname, 'adm') | ansible.utils.ipv4 | first }}"

group_vars/postgres.yml

@@ -3,3 +3,6 @@ glob_postgres:
   subnets:
     - 172.16.10.0/24
     - fd00:0:0:10::/64
+
+glob_prometheus_postgres_exporter:
+  listen_addr: "{{ query('ldap', 'ip', ansible_hostname, 'adm') | ansible.utils.ipv4 | first }}"

host_vars/fyre.adm.crans.org.yml

@@ -147,6 +147,36 @@ loc_prometheus:
             target_label: __address__
             replacement: '$1:9154'
 
+  postgres:
+    config:
+      - job_name: postgres
+        file_sd_configs:
+          - files:
+              - '/etc/prometheus/targets_postgres.json'
+        relabel_configs:
+          - source_labels: [__address__]
+            target_label: __param_target
+          - source_labels: [__param_target]
+            target_label: instance
+          - source_labels: [__param_target]
+            target_label: __address__
+            replacement: '$1:9187'
+
+  mysql:
+    config:
+      - job_name: mysql
+        file_sd_configs:
+          - files:
+              - '/etc/prometheus/targets_mysql.json'
+        relabel_configs:
+          - source_labels: [__address__]
+            target_label: __param_target
+          - source_labels: [__param_target]
+            target_label: instance
+          - source_labels: [__param_target]
+            target_label: __address__
+            replacement: '$1:9104'
+
   mtail:
     config:
       - job_name: mtail

hosts

@@ -131,6 +131,9 @@ routeur-sam.adm.crans.org
 [linx]
 linx.adm.crans.org
 
+[mariadb]
+zamok.adm.crans.org
+
 [mailman]
 mailman.adm.crans.org
 

plays/monitoring.yml

@@ -76,6 +76,20 @@
   roles:
     - prometheus-postfix-exporter
 
+# Monitor PostgreSQL metrics
+- hosts: postgres
+  vars:
+    prometheus_postgres_exporter: "{{ glob_prometheus_postgres_exporter | default({}) | combine(loc_prometheus_postgres_exporter | default({})) }}"
+  roles:
+    - prometheus-postgres-exporter
+
+# Monitor MySQL metrics
+- hosts: mariadb
+  vars:
+    prometheus_mysqld_exporter: "{{ glob_prometheus_mysqld_exporter | default({}) | combine(loc_prometheus_mysqld_exporter | default({})) }}"
+  roles:
+    - prometheus-mysqld-exporter
+
 # Monitor mailq with a special text exporter
 # - hosts: redisdead.adm.crans.org
 #   roles: ["prometheus-node-exporter-postfix"]

plays/zamok.yml

@@ -7,5 +7,6 @@
     adh: "{{ glob_adh | combine(loc_adh | default({}), recursive=True) }}"
   roles:
     - zamok-tools
+    - mariadb
     # - postfix
     - prometheus-node-exporter-postfix

roles/mariadb/tasks/main.yml

@@ -0,0 +1,8 @@
+---
+- name: Install MariaDB
+  apt:
+    update_cache: true
+    name: mariadb
+  register: apt_result
+  retries: 3
+  until: apt_result is succeeded

roles/prometheus-mysqld-exporter/handlers/main.yml

@@ -0,0 +1,5 @@
+---
+- name: Restart prometheus-mysqld-exporter
+  service:
+    name: prometheus-mysqld-exporter
+    state: restarted

roles/prometheus-mysqld-exporter/tasks/main.yml

@@ -0,0 +1,24 @@
+---
+- name: Install Prometheus mysqld-exporter
+  apt:
+    update_cache: true
+    name: prometheus-mysqld-exporter
+  register: apt_result
+  retries: 3
+  until: apt_result is succeeded
+
+- name: Make Prometheus mysqld-exporter listen on adm only
+  lineinfile:
+    path: /etc/default/prometheus-mysqld-exporter
+    regexp: ^ARGS=
+    line: |
+      ARGS="--web.listen-address={{ prometheus_mysqld_exporter.listen_addr }}:9104"
+  notify: Restart prometheus-mysqld-exporter
+
+# You need to create the prometheus account, RTFM.
+- name: Configure MySQL connection
+  lineinfile:
+    path: /etc/default/prometheus-mysqld-exporter
+    regexp: DATA_SOURCE_NAME="prometheus@unix(/run/mysqld/mysqld.sock)/"
+    line: DATA_SOURCE_NAME="prometheus@unix(/run/mysqld/mysqld.sock)/"
+  notify: Restart prometheus-mysqld-exporter

roles/prometheus-postgres-exporter/handlers/main.yml

@@ -0,0 +1,5 @@
+---
+- name: Restart prometheus-postgres-exporter
+  service:
+    name: prometheus-postgres-exporter
+    state: restarted

roles/prometheus-postgres-exporter/tasks/main.yml

@@ -0,0 +1,24 @@
+---
+- name: Install Prometheus postgres-exporter
+  apt:
+    update_cache: true
+    name: prometheus-postgres-exporter
+  register: apt_result
+  retries: 3
+  until: apt_result is succeeded
+
+- name: Make Prometheus postgres-exporter listen on adm only
+  lineinfile:
+    path: /etc/default/prometheus-postgres-exporter
+    regexp: ^ARGS=
+    line: |
+      ARGS="--web.listen-address={{ prometheus_postgres_exporter.listen_addr }}:9187"
+  notify: Restart prometheus-postgres-exporter
+
+# You need to create the prometheus account, RTFM.
+- name: Configure PostgreSQL connection
+  lineinfile:
+    path: /etc/default/prometheus-postgres-exporter
+    regexp: ^DATA_SOURCE_NAME=
+    line: DATA_SOURCE_NAME='user=prometheus host=/run/postgresql dbname=postgres'
+  notify: Restart prometheus-postgres-exporter

roles/zamok-tools/tasks/main.yml

@@ -33,7 +33,6 @@
       - libapache2-mod-wsgi-py3
       - lua-cjson # Demande du 01/09/2017 18:50 sur #crans
       - lynx # Demande du 30/07/2017 sur nounou@
-      - mariadb-server
       - moreutils # Ce package, c'est la vie !
       - nyancat
       - octave # Demande irc  #crans 28/02/2019 14h28