Ubuntu 18.04
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Prometheus : Add Target Hosts
Add Target Hosts to monitor more nodes.
[1] Install [prometheus-node-exporter] package that includes function to get general resource on the System like CPU or Memory usage on the Node you'd like to add.
apt -y install prometheus-node-exporter
# service daemon is the [prometheus-node-exporter(.service)]

systemctl status prometheus-node-exporter

*  prometheus-node-exporter.service - Prometheus exporter for machine metrics
   Loaded: loaded (/lib/systemd/system/prometheus-node-exporter.service; enabled
   Active: active (running) since Tue 2018-12-11 19:20:46 JST; 50s ago
     Docs: https://github.com/prometheus/node_exporter
 Main PID: 1377 (prometheus-node)
    Tasks: 4 (limit: 4663)
   CGroup: /system.slice/prometheus-node-exporter.service
           +--377 /usr/bin/prometheus-node-exporter --collector.diskstats.ignore
[2] Add setting on Prometheus Server Config.
vi /etc/prometheus/prometheus.yml
  # line 38: add new nodes in [targets] section
  - job_name: node
    # If prometheus-node-exporter is installed, grab stats about the local
    # machine by default.
      - targets: ['localhost:9100', 'node01.srv.world:9100']

  # if adding other group, add [job_name] section like follows
  # any name is OK for [job_name]
  - job_name: Hiroshima
      - targets: ['node02.srv.world:9100']

systemctl restart prometheus
[3] Access to the Prometheus Web UI and click [Status] - [Targets] to verify new nodes are listed.
[4] To input query directly, it's possbile to display specific Job or Node.
The example below shows a Job for node_load5. ⇒ node_load5{job="Hirosima"}
[5] The example below shows a Node for node_load5. ⇒ node_load5{instance=~"node01.*"}
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