feat: Download and install Node Exporter.

prometheus-slave/README.md

@@ -2,7 +2,12 @@
 
 ## How to run playbook
 
-```
+```bash
+NODE_EXPORTER_VERSION=1.5.0
 INVENTORY=vps.example.com,
-ansible-playbook -i $INVENTORY -e ansible_python_interpreter=/usr/bin/python3 main.yml
+ansible-playbook \
+	-i $INVENTORY \
+	-e ansible_python_interpreter=/usr/bin/python3 \
+	-e node_exporter_version=$NODE_EXPORTER_VERSION \
+	main.yml
 ```

prometheus-slave/main.yml

@@ -19,3 +19,19 @@
         home: "/usr/local/bin/node-exporter"
         system: true
         state: present
+
+    - name: Download and unzip Node Exporter
+      unarchive:
+        src: "https://github.com/prometheus/node_exporter/releases/download/v{{ node_exporter_version }}/node_exporter-{{ node_exporter_version }}.linux-amd64.tar.gz"
+        dest: /tmp/
+        remote_src: yes
+        validate_certs: no
+
+    - name: Move the binary to the installation directory
+      copy:
+        src: "/tmp/node_exporter-{{ node_exporter_version }}.linux-amd64/node_exporter"
+        dest: "/usr/local/bin/node-exporter"
+        owner: "node-exporter"
+        group: "node-exporter"
+        mode: 0755
+        remote_src: true