Prometheus : Add Monitoring Target2020/09/07

	Add Monitoring Target Nodes.
[1]	Install [node-exporter] package on the Node you'd like to add that includes features to get metric data of general resource on the System like CPU or Memory usage.

root@node01:~#

apt -y install prometheus-node-exporter

[2]	Add setting on Prometheus Server Configuration.

root@dlp:~#

vi /etc/prometheus/prometheus.yml

.....
.....
scrape_configs:
  # The job name is added as a label `job=<job_name>` to any timeseries scraped from this config.
  - job_name: 'prometheus'

    # metrics_path defaults to '/metrics'
    # scheme defaults to 'http'.

    static_configs:
    - targets: ['localhost:9090']

  # line 33: add new Host to [targets] line
    - job_name: node
    static_configs:
      - targets: ['localhost:9100', 'node01.srv.world:9100']

  # alternatively, if you'd like to add to another group,
  # add [job_name] section like follows
  # any name is OK for [job_name]
  - job_name: Hiroshima
    static_configs:
      - targets: ['node01.srv.world:9100']

root@dlp:~#

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_procs_running]. ⇒ node_procs_running{instance=~"node01.*"}

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