node_exporter.yml

- hosts: 192.168.0.16
  user: root
  gather_facts: false
  tasks: 
  - name: install node_exporter
    unarchive: src=node_exporter-1.1.2.linux-amd64.tar.gz dest=/usr/local/
  - name: create link
    file: path=/usr/local/node_exporter src=/usr/local/node_exporter-1.1.2.linux-amd64 state=link
  - name: add service file
    copy: src=node_exporter.service dest=/usr/lib/systemd/system/
  - name: enable service
    shell: systemctl enable node_exporter.service
  - name: start service
    shell: systemctl start node_exporter.service

node_exporter.service

[Unit]
Description=Prometheus node_exporter
Requires=network.target remote-fs.target
After=network.target remote-fs.target

[Service]
Type=simple
User=root
Group=root
ExecStart=/usr/local/node_exporter/node_exporter --web.listen-address=0.0.0.0:9100
ExecReload=/bin/kill -HUP $MAINPID
KillMode=process
Restart=on-failure
RestartSec=5s

[Install]
WantedBy=multi-user.target