Chapter 10. Prometheus and Grafana metrics under Red Hat Quay

Prometheus needs a way to access all Red Hat Quay instances running in a cluster. In the typical setup, this is done by listing all the Red Hat Quay instances in a single named DNS entry, which is then given to Prometheus.

A simple Kubernetes service can be configured to provide the DNS entry for Prometheus. Details on running Prometheus under Kubernetes can be found at Prometheus and Kubernetes and Monitoring Kubernetes with Prometheus.

SkyDNS is a simple solution for managing this DNS record when not using Kubernetes. SkyDNS can run on an etcd cluster. Entries for each Red Hat Quay instance in the cluster can be added and removed in the etcd store. SkyDNS will regularly read them from there and update the list of Quay instances in the DNS record accordingly.