====== Prometheus, Grafana & cAdvisor ======

  ; URL Prometheus : http://localhost:9090/
  ; URL Grafana : http://localhost:3300/
  ; URL cAdvisor : http://localhost:8080/
  ; Production : hetzner:/opt/prometheus/

==== Config ====
Docker-compose-yml anlegen:
<code>
version: '3.7'

services:
  prometheus:
    image: prom/prometheus
    container_name: prometheus
    user: root
    volumes:
      - ./prometheus:/etc/prometheus
      - ./prometheus_data:/prometheus
    command:
      - '--config.file=/etc/prometheus/prometheus.yml'
      - '--storage.tsdb.path=/prometheus'
      - '--web.enable-lifecycle'
    ports:
      - "9090:9090"
    networks:
      - internal
    restart: unless-stopped

  grafana:
    image: grafana/grafana
    container_name: grafana
    depends_on:
      - prometheus
    ports:
      - "3000:3000"
    volumes:
      - ./grafana_data:/var/lib/grafana
    environment:
      - GF_SECURITY_ADMIN_PASSWORD=${GF_PASS}
    networks:
      - internal
    restart: unless-stopped

  cadvisor:
    image: gcr.io/cadvisor/cadvisor:latest
    container_name: cadvisor
    ports:
      - "8080:8080"
    volumes:
      - /:/rootfs:ro
      - /var/run:/var/run:rw
      - /sys:/sys:ro
      - /var/lib/docker/:/var/lib/docker:ro
    networks:
      - internal
    restart: unless-stopped
    
networks:
   internal:
      external: false
</code>

In Unterordner prometheus/prometheus.yml anlegen:
<code>
global:
  scrape_interval: 15s # By default, scrape targets every 15 seconds.
  evaluation_interval: 15s # Evaluate rules every 15 seconds.
  # Attach these labels to any time series or alerts when communicating with
  # external systems (federation, remote storage, Alertmanager).
  external_labels:
    monitor: 'Hetzner'

# Alertmanager configuration goes here (if used)
alerting:
  alertmanagers:
  - static_configs:
    - targets:
       # - alertmanager:9093

scrape_configs:
  - job_name: prometheus
    honor_labels: true
    honor_timestamps: true
    scheme: http
    scrape_interval: 60s
    scrape_timeout: 55s
    metrics_path: /metrics
    static_configs:
      - targets: ['prometheus:9090']
      - 
  - job_name: cadvisor
    scrape_interval: 5s
    static_configs:
      - targets: ['cadvisor:8080']

  - job_name: 'dwb@smns'
    static_configs:
      - targets: ['smns.diversityworkbench.de:9175']
</code>

===== SSH Tunnel =====
Prometheus (9090), Grafana (3000) & cAdvisor (8080) laufen nur lokal auf Hetzner, daher ist es notwendig einen SSH Tunnel zu öffnen, um die Seiten anzuschauen.\\
**Voraussetzung ist natürlich, dass man seinen SSH Key auf dem Server hinterlegt hat.**
==== Windows ====
SSH Connectstring mit mehrfachem Tunnel:
<code>
ssh username@144.76.68.113 -p 666 -L 3000:144.76.68.113:3000 -L 8080:144.76.68.113:8080 -L 9090:144.76.68.113:9090
</code>
Die Seiten sind dann über http://localhost:9090/, http://localhost:3000/ bzw. http://localhost:8080/ erreichbar.

==== Linux ====
~/.ssh/config:
<code>
Host Hetzner
  User xyz
  HostName 144.76.68.113
  Port 666
  IdentityFile ~/.ssh/id_rsa.pub
  localforward 3000 144.76.68.113:3000
  localforward 8080 144.76.68.113:8080
  localforward 9090 144.76.68.113:9090
</code>