feat(postgres_exporter): add ansible role for deployment using docker

roles/postgres_exporter/defaults/main.yml

@@ -0,0 +1,35 @@
+---
+
+postgres_exporter_version: "0.10.1"
+postgres_exporter_user: root
+postgres_exporter_create_user: false
+
+postgres_exporter_db_host: ~
+postgres_exporter_db_user: postgres
+postgres_exporter_db_pass: ~
+postgres_exporter_db_port: ~
+postgres_exporter_db_sslmode: false
+
+postgres_exporter_container_name: postgres_exporter
+postgres_exporter_container_image_name: quay.io/prometheuscommunity/postgres-exporter
+postgres_exporter_container_image_tag: ~
+postgres_exporter_container_image_ref: "{{ postgres_exporter_container_image_name }}:{{ postgres_exporter_container_image_tag | default('v' + postgres_exporter_version) }}"
+postgres_exporter_container_networks: ~
+postgres_exporter_container_purge_networks: false
+postgres_exporter_container_volumes: []
+postgres_exporter_container_ports: ~
+postgres_exporter_container_env:
+  DATA_SOURCE_NAME: >-
+    user={{ postgres_exporter_db_user }}
+    host={{ postgres_exporter_db_host }}
+    sslmode={{ 'enable' if postgres_exporter_db_sslmode else 'disable' }}
+    {% if postgres_exporter_db_pass %}
+    pass={{ postgres_exporter_db_pass }}
+    {% endif %}
+    {% if postgres_exporter_db_port %}
+    port={{ postgres_exporter_db_port }}
+    {% endif %}
+postgres_exporter_container_labels:
+  VERSION: "{{ postgres_exporter_version }}"
+postgres_exporter_container_user: "{{ postgres_exporter_user_info.uid if postgres_exporter_user_info is defined else postgres_exporter_user }}"
+postgres_exporter_container_restart_policy: unless-stopped

roles/postgres_exporter/tasks/main.yml

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+---
+
+- name: Ensure user '{{ postgres_exporter_user }}' exists
+  user:
+    name: "{{ postgres_exporter_user }}"
+    state: present
+    system: yes
+  register: postgres_exporter_user_info
+  when: postgres_exporter_create_user
+
+- name: Ensure container image '{{ postgres_exporter_container_image_ref }}' is available
+  docker_container_image:
+    name: "{{ postgres_exporter_container_image_ref }}"
+    state: present
+    source: pull
+    force_source: "{{ postgres_exporter_container_image_tag|bool }}"
+
+- name: Ensure postgres exporter container '{{ postgres_exporter_container_name }}' is running
+  docker_container:
+    name: "{{ postgres_exporter_container_name }}"
+    image: "{{ postgres_exporter_container_image_ref }}"
+    networks: "{{ postgres_exporter_container_networks | default(omit) }}"
+    purge_networks: "{{ postgres_exporter_container_purge_networks }}"
+    volumes: "{{ postgres_exporter_container_volumes | default(omit) }}"
+    labels: "{{ postgres_exporter_container_labels | default(omit) }}"
+    ports: "{{ postgres_exporter_container_ports | default(omit) }}"
+    user: "{{ postgres_exporter_container_user }}"
+    env: "{{ postgres_exporter_container_env }}"
+    restart_policy: "{{ postgres_exporter_container_restart_policy }}"
+    state: started