Monitoring multiple CDN Directors

You're viewing a development version of router, the latest released version is 1.24.0

By default an instance of Prometheus only monitors the ESB3024 CDN Director that is installed on the same host as where Prometheus is installed. It is possible to make it monitor other CDN Director instances and visualize all instances on one Grafana instance.

Configuring of Prometheus

This is configured in the scraping configuration of Prometheus, which is found in the file /opt/edgeware/acd/prometheus/prometheus.yaml, which typically looks like this:

global:
  scrape_interval:     15s

rule_files:
  - recording-rules.yaml

# A scrape configuration for router metrics
scrape_configs:
  - job_name: 'router-scraper'
    scheme: https
    tls_config:
      insecure_skip_verify: true
    static_configs:
    - targets:
      - acd-router-1:5001
    metrics_path: /m1/v1/metrics
    honor_timestamps: true
  - job_name: 'edns-proxy-scraper'
    scheme: http
    static_configs:
    - targets:
      - acd-router-1:8888
    metrics_path: /metrics
    honor_timestamps: true

More CDN Directors can be added to the scrape configuration by simply adding more CDN Directors under targets in the scraper jobs.

For instance, to monitor acd-router-2 and acd-router-3 along acd-router-1, the configuration file needs to be modified like this:

global:
  scrape_interval:     15s

rule_files:
  - recording-rules.yaml

# A scrape configuration for router metrics
scrape_configs:
  - job_name: 'router-scraper'
    scheme: https
    tls_config:
      insecure_skip_verify: true
    static_configs:
    - targets:
      - acd-router-1:5001
      - acd-router-2:5001
      - acd-router-3:5001
    metrics_path: /m1/v1/metrics
    honor_timestamps: true
  - job_name: 'edns-proxy-scraper'
    scheme: http
    static_configs:
    - targets:
      - acd-router-1:8888
      - acd-router-2:8888
      - acd-router-3:8888
    metrics_path: /metrics
    honor_timestamps: true

After the file has been modified, Prometheus needs to be restarted by typing

systemctl restart acd-prometheus

It is possible to use the same configuration on multiple CDN Directors, so that all CDN Directors in a deployment can monitor each other.

Selecting CDN Director in Grafana

In the top left corner the Grafana dashboards have a drop-down menu labeled “ACD Router”, which allows to choose which CDN Director to monitor.