// Aula 2 - Instalação do Prometheus

https://prometheus.io/download/

# dnf install vim wget

# dnf group install "Development Tools"

# useradd -M -r -s /bin/false prometheus

# mkdir /etc/prometheus

# mkdir /var/lib/prometheus

# wget https://github.com/prometheus/prometheus/releases/download/v2.37.6/prometheus-2.37.6.linux-amd64.tar.gz -P /tmp

# cd /tmp

# tar -xzf prometheus-*.linux-amd64.tar.gz

# ls prometheus-*.linux-amd64

# cd prometheus-*.linux-amd64/

# cp prometheus-*.linux-amd64/{prometheus,promtool} /usr/local/bin/

# cp -r prometheus-*.linux-amd64/{consoles,console_libraries} /etc/prometheus/

# cp prometheus-*.linux-amd64/prometheus.yml /etc/prometheus/

# cd /etc/prometheus/

# vim prometheus.yml

# my global config
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).

# Alertmanager configuration
alerting:
  alertmanagers:
  - static_configs:
    - targets:
      # - alertmanager: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=` to any timeseries scraped from this config.
  - job_name: 'prometheus'

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

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

# firewall-cmd --add-port=9090/tcp --permanent

# firewall-cmd --reload 

# chown -R prometheus:prometheus /etc/prometheus

# chown -R prometheus:prometheus /var/lib/prometheus

# chown prometheus.prometheus /usr/local/bin/{prometheus,promtool}

# prometheus --config.file=/etc/prometheus/prometheus.yml

# touch /etc/systemd/system/prometheus.service

# cat > /etc/systemd/system/prometheus.service << 'EOL'
[Unit]
Description=Prometheus Time Series Collection and Processing Server
Wants=network-online.target
After=network-online.target

[Service]
User=prometheus
Group=prometheus
Type=simple
ExecStart=/usr/local/bin/prometheus \
    --config.file /etc/prometheus/prometheus.yml \
    --storage.tsdb.path /var/lib/prometheus/ \
    --web.console.templates=/etc/prometheus/consoles \
    --web.console.libraries=/etc/prometheus/console_libraries

[Install]
WantedBy=multi-user.target
EOL

# systemctl daemon-reload

# systemctl enable --now prometheus

# systemctl status prometheus

# ss -altnp | grep 9090