Prometheus : Install2020/09/07

	Install Systems monitoring and Alerting toolkit [Prometheus]. Learn Overview about Prometheus on the pfficial site below. ⇒ https://prometheus.io/docs/introduction/overview/
[1]	Install Prometheus Server and also Install [node-exporter] that includes features to get metric data of general resource on the System like CPU or Memory usage.

root@dlp:~#

apt -y install prometheus prometheus-node-exporter

[2]	Configure basic settings on [prometheus.yml].

# the default setting is like follows

# even if keeping default, [Prometheus] server related metrics are collected

root@dlp:~#

vi /etc/prometheus/prometheus.yml

# Sample config for Prometheus.

global:
  scrape_interval:     15s # Set the scrape interval to every 15 seconds. Default is every 1 minute.
  evaluation_interval: 15s # Evaluate rules every 15 seconds. The default is every 1 minute.
  # scrape_timeout is set to the global default (10s).

  # Attach these labels to any time series or alerts when communicating with
  # external systems (federation, remote storage, Alertmanager).
  external_labels:
      monitor: 'example'

# Alertmanager configuration
alerting:
  alertmanagers:
  - static_configs:
    - targets: ['localhost:9093']

# Load rules once and periodically evaluate them according to the global 'evaluation_interval'.
rule_files:
  # - "first_rules.yml"
  # - "second_rules.yml"

# A scrape configuration containing exactly one endpoint to scrape:
# Here it's Prometheus itself.
scrape_configs:
  # The job name is added as a label `job=<job_name>` to any timeseries scraped from this config.
  - job_name: 'prometheus'

    # Override the global default and scrape targets from this job every 5 seconds.
    scrape_interval: 5s
    scrape_timeout: 5s

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

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

  - job_name: node
    # If prometheus-node-exporter is installed, grab stats about the local
    # machine by default.
    static_configs:
      - targets: ['localhost:9100']

root@dlp:~#

systemctl enable prometheus prometheus-node-exporter

[3]	Access to the [http://(Prometheus server's hostname or IP address):9090/] from a client host, Then, Prometheus Web UI is shown like follows.

[4]

To click [insert metric at cursor], there are many queries to view time series data.
It's also possible to input queries directly on the input form above, by Prometheus [Expression Language].

Refer to the official document about usage of Expression Language.
⇒ https://prometheus.io/docs/querying/examples/

[5]	This is the state of executing [node_procs_running].

[6]	To click [Status] - [Targets], possible to confrm status for each node.

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