Merge pull request #1 from smartlogic/redis_exporter

Setup ability to template out redis_exporter with systemd

README.md

@@ -22,6 +22,8 @@ None
 - `node_exporter_checksum` - The checksum for the version of node exporter
 - `alertmanager_version` - Which version of alertmanager to download
 - `alertmanager_checksum` - The checksum for the version of alertmanager
+- `redis_exporter_version` - Which version of redis_exporter to download
+- `redis_exporter_checksum` - The checksum for the version of redis_exporter
 - `grafana_ini_file` - The file to use for `grafana.ini`
   - Default: `grafana.ini`
 - `prometheus_config_file` - The file to use for `prometheus.yml`
@@ -71,6 +73,14 @@ Node exporter only:
     - { role: prometheus, action: "node_exporter" }
 ```
 
+Redis exporter:
+
+```yaml
+- hosts: servers
+  roles:
+    - { role: prometheus, action: "redis_exporter" }
+```
+
 ## License
 
 MIT

defaults/main.yml

@@ -8,6 +8,9 @@ node_exporter_checksum: 7ffb3773abb71dd2b2119c5f6a7a0dbca0cff34b24b2ced9e01d9897
 alertmanager_version: 0.10.0
 alertmanager_checksum: ef09b9c9795a7148fd74bb1dcecdd00a4fa25da05a4d2b8517e6ceb5f124e1a8
 
+redis_exporter_version: 0.14
+redis_exporter_checksum: ba80d6902a7020ca94156741cb1d6e44480d19bfa753315d5e6b0f099921bce0
+
 grafana_ini_file: grafana.ini
 prometheus_config_file: prometheus.yml
 prometheus_alert_file: alertmanager.yml

handlers/main.yml

@@ -27,3 +27,9 @@
     name: node_exporter
     state: restarted
   become: true
+
+- name: restart redis_exporter
+  service:
+    name: redis_exporter
+    state: restarted
+  become: true

tasks/main.yml

@@ -9,3 +9,6 @@
 
 - import_tasks: node_exporter.yml
   when: action == "full" or action == "node_exporter"
+
+- import_tasks: redis_exporter.yml
+  when: action == "redis_exporter"

tasks/redis_exporter.yml

@@ -0,0 +1,53 @@
+- name: "Create the prometheus user"
+  user:
+    name: prometheus
+    comment: "Prometheus"
+  become: true
+
+- name: "Create version folder"
+  file:
+    path: "/home/prometheus/redis_exporter/{{ redis_exporter_version }}"
+    state: directory
+    mode: 0700
+  become: yes
+  become_user: prometheus
+
+- name: "Download the redis_exporter file"
+  get_url:
+    url: "https://github.com/oliver006/redis_exporter/releases/download/v{{ redis_exporter_version }}/redis_exporter-v{{ redis_exporter_version }}.linux-amd64.tar.gz"
+    dest: "/home/prometheus/redis_exporter/{{ redis_exporter_version }}/redis_exporter.tar.gz"
+    mode: 0400
+    checksum: "sha256:{{ redis_exporter_checksum }}"
+  become: yes
+  become_user: prometheus
+
+- name: stat final file
+  stat: path="/home/prometheus/redis_exporter/{{ redis_exporter_version }}/redis_exporter"
+  register: redis_exporter_stat
+  become: yes
+  become_user: prometheus
+
+- name: "Extract archive"
+  unarchive:
+    src: "/home/prometheus/redis_exporter/{{ redis_exporter_version }}/redis_exporter.tar.gz"
+    dest: "/home/prometheus/redis_exporter/{{ redis_exporter_version }}/"
+    remote_src: yes
+  when: redis_exporter_stat.stat.exists == False
+  become: yes
+  become_user: prometheus
+
+- name: Template out the service file
+  template:
+    src: redis_exporter.service.j2
+    dest: /etc/systemd/system/redis_exporter.service
+    mode: 0644
+  become: yes
+  notify:
+    - reload systemd
+    - restart redis_exporter
+
+- name: Enable redis exporter
+  systemd:
+    enabled: yes
+    name: redis_exporter
+  become: yes

templates/redis_exporter.service.j2

@@ -0,0 +1,12 @@
+[Unit]
+Description=Prometheus Redis Exporter
+After=network-online.target
+
+[Service]
+User=prometheus
+Restart=on-failure
+WorkingDirectory=/home/prometheus/redis_exporter/{{ redis_exporter_version }}
+ExecStart=/home/prometheus/redis_exporter/{{ redis_exporter_version }}/redis_exporter
+
+[Install]
+WantedBy=multi-user.target