Prometheus : Add Monitoring Target

	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 ~]# cat > /etc/yum.repos.d/prometheus.repo <<'EOF' [prometheus] name=prometheus baseurl=https://packagecloud.io/prometheus-rpm/release/el/$releasever/$basearch repo_gpgcheck=1 enabled=1 gpgkey=https://packagecloud.io/prometheus-rpm/release/gpgkey https://raw.githubusercontent.com/lest/prometheus-rpm/master/RPM-GPG-KEY-prometheus-rpm gpgcheck=1 metadata_expire=300 EOF [root@node01 ~]#  update-crypto-policies --set DEFAULT:SHA1 [root@node01 ~]#  dnf -y install node_exporter [root@node01 ~]#  systemctl enable --now node_exporter

[2]	If Firewalld is running, allow ports.

[root@node01 ~]#  firewall-cmd --add-port=9100/tcp success [root@node01 ~]#  firewall-cmd --runtime-to-permanent success

[3]	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

[4]	Access to the Prometheus Web UI and click [Status] - [Targets] to verify new nodes are listed.

[5]	To input query directly, it's possible to display specific Job or Node. The example below shows a Job for [node_load5]. ⇒ node_load5{job="Hiroshima"}

[6]	The example below shows a Node for [node_procs_running]. ⇒ node_procs_running{instance=~"node01.*"}