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Monitoring MySQL with KubeDB

KubeDB has native support for monitoring via Prometheus. You can use builtin Prometheus scraper or Prometheus operator to monitor KubeDB managed databases. This tutorial will show you how database monitoring works with KubeDB and how to configure Database crd to enable monitoring.


KubeDB uses Prometheus exporter images to export Prometheus metrics for respective databases. Following diagram shows the logical flow of database monitoring with KubeDB.

  Database Monitoring Flow

When a user creates a database crd with spec.monitor section configured, KubeDB operator provisions the respective database and injects an exporter image as sidecar to the database pod. It also creates a dedicated stats service with name {database-crd-name}-stats for monitoring. Prometheus server can scrape metrics using this stats service.

Configure Monitoring

In order to enable monitoring for a database, you have to configure spec.monitor section. KubeDB provides following options to configure spec.monitor section:

spec.monitor.agentRequiredType of the monitoring agent that will be used to monitor this database. It can be or
spec.monitor.prometheus.exporter.portOptionalPort number where the exporter side car will serve metrics.
spec.monitor.prometheus.exporter.argsOptionalArguments to pass to the exporter sidecar.
spec.monitor.prometheus.exporter.envOptionalList of environment variables to set in the exporter sidecar container.
spec.monitor.prometheus.exporter.resourcesOptionalResources required by exporter sidecar container.
spec.monitor.prometheus.exporter.securityContextOptionalSecurity options the exporter should run with.
spec.monitor.prometheus.serviceMonitor.labelsOptionalLabels for ServiceMonitor crd.
spec.monitor.prometheus.serviceMonitor.intervalOptionalInterval at which metrics should be scraped.

Sample Configuration

A sample YAML for MySQL crd with spec.monitor section configured to enable monitoring with Prometheus operator is shown below.

kind: MySQL
  name: prom-operator-mysql
  namespace: demo
  version: "8.0.35"
  terminationPolicy: WipeOut
    storageClassName: "standard"
      - ReadWriteOnce
        storage: 1Gi
          release: prometheus
        interval: 10s

Assume that above Redis is configured to use basic authentication. So, exporter image also need to provide password to collect metrics. We have provided it through spec.monitor.args field.

Here, we have specified that we are going to monitor this server using Prometheus operator through spec.monitor.agent: KubeDB will create a ServiceMonitor crd in monitoring namespace and this ServiceMonitor will have release: prometheus label.

Next Steps