refactor to use Docker Compose

Signed-off-by: Jakub Sokołowski <jakub@status.im>

README.md

@@ -30,6 +30,8 @@ You can manage existing alerts by using the `amtool` on any of the hosts running
  > amtool alert
 Alertname        Starts At                Summary
 Test_Alert       2018-07-06 18:30:18 UTC  This is a testing alert!
+```
+```
  > amtool silence
 ID                                    Matchers                Starts At                Ends At                  Updated At               Created By  Comment  
 9635b573-5177-4601-a3b0-ac6a25d0a4ef  alertname=InstanceDown  2018-07-06 12:37:04 UTC  2018-07-06 14:36:05 UTC  2018-07-06 12:37:04 UTC  jakubgs     test

defaults/main.yml

@@ -1,25 +1,30 @@
 ---
+alertmanager_service_name: 'alertmanager'
+alertmanager_service_path: '/docker/{{ alertmanager_service_name }}'
+alertmanager_compose_file: '{{ alertmanager_service_path }}/docker-compose.yml'
+
+# Public Domain
+alertmanager_domain: ~
+alertmanager_url: 'https://{{ alertmanager_domain | mandatory }}/'
+alertmanager_admin_email: ~
+
+# Container
 alertmanager_cont_tag: 'v0.21.0'
 alertmanager_cont_image: 'quay.io/prometheus/alertmanager:{{ alertmanager_cont_tag }}'
-alertmanager_cont_name: 'alertmanager'
-alertmanager_cont_vol: '/docker/{{ alertmanager_cont_name }}'
-alertmanager_cont_log_lvl: info
+alertmanager_cont_log_lvl: 'info'
 
-# port used for the web ui
+# Port used for the web ui
 alertmanager_webui_port: 9093
-# port used for clustering AlertManager peers
+# Port used for clustering AlertManager peers
 alertmanager_cluster_port: 9094
 
+# SMTP
 alertmanager_smtp_host: ~
 alertmanager_smtp_port: ~
 alertmanager_smtp_from: ~
 alertmanager_smtp_user: ~
 alertmanager_smtp_pass: ~
 
-alertmanager_domain: ~
-alertmanager_url: 'https://{{ alertmanager_domain | mandatory }}/'
-alertmanager_admin_email: ~
-
 # Route configuration
 alertmanager_group_by: ['alertname', 'cluster']
 alertmanager_group_wait: '30s'
@@ -37,6 +42,6 @@ alertmanager_victorops_state_message: '{% raw %}Alert: {{ .CommonLabels.alertnam
 consul_catalog_url: 'http://localhost:8500/v1/catalog'
 
 # Generic container options
-cont_state: started
-cont_recreate: false
-cont_restart: false
+compose_recreate: 'smart'
+compose_state: 'present'
+compose_restart: false

tasks/config.yml

@@ -1,22 +1,22 @@
 ---
 - name: Create container directories
   file:
-    path: '{{ alertmanager_cont_vol }}/{{ item }}'
+    path: '{{ alertmanager_service_path }}/{{ item }}'
     state: 'directory'
     owner: 'dockremap'
     group: 'docker'
     recurse: true
   with_items:
-    - data
-    - conf
+    - 'data'
+    - 'conf'
 
 - name: Create config files
   template:
     src: '{{ item }}.j2'
-    dest: '{{ alertmanager_cont_vol }}/conf/{{ item }}'
+    dest: '{{ alertmanager_service_path }}/conf/{{ item }}'
     owner: 'dockremap'
     group: 'docker'
-  register: alertmanager_cont_config
+  register: alertmanager_config
   with_items:
     - 'alertmanager.yml'
     - 'amtool.yml'

tasks/consul.yml

@@ -2,9 +2,9 @@
 - name: Create Consul service definition
   include_role: name=consul-service
   vars:
-    consul_config_name: '{{ alertmanager_cont_name }}'
+    consul_config_name: '{{ alertmanager_service_name }}'
     consul_services:
-      - name: '{{ alertmanager_cont_name }}'
+      - name: '{{ alertmanager_service_name }}'
         tags: ['metrics', 'alertmanager']
         port: '{{ alertmanager_webui_port }}'
         address: '{{ ansible_local.tinc.vpn_ip }}'

tasks/container.yml

@@ -1,29 +1,17 @@
 ---
-- name: Start container
-  docker_container:
-    name: '{{ alertmanager_cont_name }}'
-    image: '{{ alertmanager_cont_image }}'
-    user: root
+- name: Create compose file
+  template:
+    src: 'docker-compose.yml.j2'
+    dest: '{{ alertmanager_compose_file }}'
+    owner: 'dockremap'
+    group: 'docker'
+    mode: 0644
+
+- name: Create containers
+  docker_compose:
+    project_src: '{{ alertmanager_service_path }}'
     pull: true
-    restart_policy: always
-    state: '{{ cont_state }}'
-    recreate: '{{ cont_recreate }}'
-    restart: '{{ alertmanager_cont_config.changed | default(cont_restart) }}'
-    ports:
-      - '0.0.0.0:{{ alertmanager_cluster_port }}:{{ alertmanager_cluster_port }}'
-      - '0.0.0.0:{{ alertmanager_webui_port }}:{{ alertmanager_webui_port }}'
-    volumes:
-      - '{{ alertmanager_cont_vol }}/conf/alertmanager.yml:/etc/alertmanager.yml:ro'
-      - '{{ alertmanager_cont_vol }}/conf/amtool.yml:/etc/amtool/config.yml:ro'
-      - '{{ alertmanager_cont_vol }}/data:/data'
-      - '/certs:/certs'
-    command: |
-      --storage.path=/data
-      --log.level={{ alertmanager_cont_log_lvl }}
-      --config.file=/etc/alertmanager.yml
-      --web.external-url={{ alertmanager_url }}
-      --cluster.advertise-address="{{ ansible_local.tinc.vpn_ip }}:{{ alertmanager_cluster_port }}"
-      --cluster.listen-address="0.0.0.0:{{ alertmanager_cluster_port }}"
-      {% for peer in cluster_peers %}
-      --cluster.peer={{ peer }}:{{ alertmanager_cluster_port }}
-      {% endfor %}
+    build: false
+    state: '{{ compose_state }}'
+    restarted: '{{ compose_restart }}'
+    recreate: '{{ alertmanager_config.changed | ternary("always", compose_recreate) }}'

tasks/discover.yml

@@ -6,7 +6,7 @@
 
 - name: Get AlertManager node addresses
   uri:
-    url: '{{ consul_catalog_url }}/service/{{ alertmanager_cont_name }}?dc={{ item }}'
+    url: '{{ consul_catalog_url }}/service/{{ alertmanager_service_name }}?dc={{ item }}'
     method: GET
     validate_certs: no
   with_items: '{{ data_centers.json }}'
@@ -14,8 +14,8 @@
 
 - name: Extract IP addresses
   set_fact:
-    cluster_peers: |
+    alertmanager_cluster_peers: |
       {{ alertmanager_services.results
       | sum(attribute="json", start=[])
-      | map(attribute="ServiceAddress")
+      | sort(attribute='Node')
       | list }}

tasks/main.yml

@@ -1,6 +1,6 @@
 ---
-- include_tasks: consul.yml
+#- include_tasks: consul.yml
 - include_tasks: discover.yml
 - include_tasks: config.yml
 - include_tasks: container.yml
-- include_tasks: wrapper.yml
+#- include_tasks: wrapper.yml

templates/docker-compose.yml.j2

@@ -0,0 +1,26 @@
+---
+version: '3.7'
+services:
+  app:
+    container_name: '{{ alertmanager_service_name }}'
+    image: '{{ alertmanager_cont_image }}'
+    user: 'root'
+    restart: 'always'
+    ports:
+      - '0.0.0.0:{{ alertmanager_webui_port }}:{{ alertmanager_webui_port }}' # Web UI
+      - '0.0.0.0:{{ alertmanager_cluster_port }}:{{ alertmanager_cluster_port }}' # Cluster
+    volumes:
+      - '{{ alertmanager_service_path }}/conf/alertmanager.yml:/etc/alertmanager.yml:ro'
+      - '{{ alertmanager_service_path }}/conf/amtool.yml:/etc/amtool/config.yml:ro'
+      - '{{ alertmanager_service_path }}/data:/data'
+      - '/certs:/certs'
+    command:
+      - '--storage.path=/data'
+      - '--log.level={{ alertmanager_cont_log_lvl }}'
+      - '--config.file=/etc/alertmanager.yml'
+      - '--web.external-url={{ alertmanager_url }}'
+      - '--cluster.advertise-address={{ ansible_local.tinc.vpn_ip }}:{{ alertmanager_cluster_port }}'
+      - '--cluster.listen-address=0.0.0.0:{{ alertmanager_cluster_port }}'
+{% for peer in alertmanager_cluster_peers %}
+      - '--cluster.peer={{ peer.ServiceAddress }}:{{ peer.ServicePort }}' # {{ peer.Node }}
+{% endfor %}