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Use Ansible Galaxy role for Node Exporter
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@ -126,44 +126,52 @@ Restart ~prometheus.service~ again.
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The Prometheus web interface and dashboard should now be browsable at [[http://localhost:9090]]
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** Install and configure Node Exporter on each client using Ansible ad-hoc
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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.
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** Install and configure Node Exporter on each client using Ansible
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Place the following ~node_exporter.service~ into the same directory as the inventory file:
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#+BEGIN_SRC systemd
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[Unit]
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Description=Node Exporter
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Wants=network-online.target
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After=network-online.target
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Install the prometheus.prometheus role from Ansible Galaxy.
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[Service]
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User=node_exporter
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Group=node_exporter
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Type=simple
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Restart=on-failure
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RestartSec=5s
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ExecStart=/usr/local/bin/node_exporter
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[Install]
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WantedBy=multi-user.target
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#+BEGIN_SRC shell
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ansible-galaxy collection install prometheus.prometheus
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#+END_SRC
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Download and unpack the latest version of node_exporter. This note assumes it is version 1.8.2.
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Ensure you have an inventory file with clients to setup Prometheus on.
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#+BEGIN_SRC yaml
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---
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prometheus-clients:
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hosts:
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host0:
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ansible_user: user0
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ansible_host: host0 ip address or hostname
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ansible_python_interpreter: /usr/bin/python3
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host1:
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...
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host2:
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...
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#+END_SRC
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Create ~prometheus-setup.yml~.
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#+BEGIN_SRC yaml
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---
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- hosts: prometheus-clients
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tasks:
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- name: Import the node_exporter role
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import_role:
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name: prometheus.prometheus.node_exporter
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#+END_SRC
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The default values for the node_exporter role variables should be fine.
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Run ansible-playbook.
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#+BEGIN_SRC shell
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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"
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ansible -i inventory.yml homelab -m ansible.builtin.shell -a "echo '6809dd0b3ec45fd6e992c19071d6b5253aed3ead7bf0686885a51d85c6643c66 node_exporter-1.8.2.linux-amd64.tar.gz' | sha256sum -c"
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ansible -i inventory.yml homelab -m ansible.builtin.shell -a "tar xfz node_exporter-1.8.2.linux-amd64.tar.gz"
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ansible -i inventory.yml homelab -m ansible.builtin.shell -a "sudo mv node_exporter-1.8.2.linux-amd64/node_exporter /usr/local/bin/"
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ansible -i inventory.yml homelab -m ansible.builtin.shell -a "rm -rf node_exporter-1.8.2.linux-amd64*"
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ansible -i inventory.yml homelab -m ansible.builtin.shell -a "sudo useradd -rs /bin/false node_exporter"
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ansible -b -i inventory.yml homelab -m ansible.builtin.copy -a "src=node_exporter.service dest=/etc/systemd/system/node_exporter.service"
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ansible -b -i inventory.yml homelab -m ansible.builtin.systemd_service -a "daemon_reload=true"
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ansible -b -i inventory.yml homelab -m ansible.builtin.systemd_service -a "name=node_exporter enabled=true state=started"
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ansible-playbook -i inventory.yml node_exporter-setup.yml
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#+END_SRC
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Node Exporter should now be installed, started, and enabled on each host with the homelab label in the inventory.
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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.
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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.
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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.
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#+BEGIN_SRC shell
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