Use Ansible Galaxy role for Node Exporter

prometheus.org

@@ -126,44 +126,52 @@ Restart ~prometheus.service~ again.
 
 The Prometheus web interface and dashboard should now be browsable at [[http://localhost:9090]]
 
-** Install and configure Node Exporter on each client using Ansible ad-hoc
-This assumes you have an inventory file properly setup. The inventory file contains a host group labeled 'homelab', which contains a list of all hosts you want to install node_exporter on.
+** Install and configure Node Exporter on each client using Ansible
 
-Place the following ~node_exporter.service~ into the same directory as the inventory file:
-#+BEGIN_SRC systemd
-[Unit]
-Description=Node Exporter
-Wants=network-online.target
-After=network-online.target
+Install the prometheus.prometheus role from Ansible Galaxy.
 
-[Service]
-User=node_exporter
-Group=node_exporter
-Type=simple
-Restart=on-failure
-RestartSec=5s
-ExecStart=/usr/local/bin/node_exporter
-
-[Install]
-WantedBy=multi-user.target
+#+BEGIN_SRC shell
+ansible-galaxy collection install prometheus.prometheus
 #+END_SRC
 
-Download and unpack the latest version of node_exporter. This note assumes it is version 1.8.2.
+Ensure you have an inventory file with clients to setup Prometheus on.
+
+#+BEGIN_SRC yaml
+---
+prometheus-clients:
+  hosts:
+    host0:
+      ansible_user: user0
+      ansible_host: host0 ip address or hostname
+      ansible_python_interpreter: /usr/bin/python3
+    host1:
+      ...
+    host2:
+      ...
+#+END_SRC
+
+Create ~prometheus-setup.yml~.
+
+#+BEGIN_SRC yaml
+---
+- hosts: prometheus-clients
+  tasks:
+    - name: Import the node_exporter role
+      import_role:
+        name: prometheus.prometheus.node_exporter
+#+END_SRC
+
+The default values for the node_exporter role variables should be fine.
+
+Run ansible-playbook.
+
 #+BEGIN_SRC shell
-ansible -i inventory.yml homelab -a "wget https://github.com/prometheus/node_exporter/releases/download/v1.8.2/node_exporter-1.8.2.linux-amd64.tar.gz"
-ansible -i inventory.yml homelab -m ansible.builtin.shell -a "echo '6809dd0b3ec45fd6e992c19071d6b5253aed3ead7bf0686885a51d85c6643c66 node_exporter-1.8.2.linux-amd64.tar.gz' | sha256sum -c"
-ansible -i inventory.yml homelab -m ansible.builtin.shell -a "tar xfz node_exporter-1.8.2.linux-amd64.tar.gz"
-ansible -i inventory.yml homelab -m ansible.builtin.shell -a "sudo mv node_exporter-1.8.2.linux-amd64/node_exporter /usr/local/bin/"
-ansible -i inventory.yml homelab -m ansible.builtin.shell -a "rm -rf node_exporter-1.8.2.linux-amd64*"
-ansible -i inventory.yml homelab -m ansible.builtin.shell -a "sudo useradd -rs /bin/false node_exporter"
-ansible -b -i inventory.yml homelab -m ansible.builtin.copy -a "src=node_exporter.service dest=/etc/systemd/system/node_exporter.service"
-ansible -b -i inventory.yml homelab -m ansible.builtin.systemd_service -a "daemon_reload=true"
-ansible -b -i inventory.yml homelab -m ansible.builtin.systemd_service -a "name=node_exporter enabled=true state=started"
+ansible-playbook -i inventory.yml node_exporter-setup.yml
 #+END_SRC
 
 Node Exporter should now be installed, started, and enabled on each host with the homelab label in the inventory.
 
-To confirm that statistics are being collected on each host, navigate to ~http://host_url:9100~. A page entitled Node Exporter should be displayed containg a link for Metrics. Click the link and confirm that statics are being collected.
+To confirm that statistics are being collected on each host, navigate to ~http://host_url:9100~. A page entitled Node Exporter should be displayed containing a link for Metrics. Click the link and confirm that statistics are being collected.
 
 Note that each node_exporter host must be accessible through the firewall on port 9100. Firewalld can be configured for the ~internal~ zone on each host.
 #+BEGIN_SRC shell