Monitoring container clusters with Prometheus

Perfect Fit

Conclusions

The demo environment shown in this article shows how you can monitor your Kubernetes cluster. Various metrics inform you about what is currently happening in the cluster. More fine tuning helps: You can expand the production monitoring system to include the Alert Manager and the need to think about persistent data storage. The CoreOS Prometheus operator [24] [25] takes an interesting approach; it installs production-ready Kubernetes monitoring with very little effort.

Infos

Kubernetes: https://kubernetes.io
"Prometheus" by Michael Kraus, ADMIN , issue 40, 2017, pg. 20, http://www.admin-magazine.com/Archive/2017/40/Time-series-based-monitoring-with-Prometheus
Example from the Kubernetes documentation: https://github.com/prometheus/prometheus/blob/master/documentation/examples/prometheus-kubernetes.yml
More about relabeling: https://www.robustperception.io/life-of-a-label/
PromQL: https://prometheus.io/docs/querying/basics/
Prometheus 2.0: https://coreos.com/blog/prometheus-2.0-storage-layer-optimization
Persistent volumes: https://kubernetes.io/docs/concepts/storage/persistent-volumes/
Stateful sets: https://kubernetes.io/docs/concepts/workloads/controllers/statefulset/
Minikube: https://github.com/kubernetes/minikube
Installing Minikube: https://github.com/kubernetes/minikube#installation
Listings for the article: ftp://ftp.linux-magazine.com/pub/listings/admin-magazine.com/41/
RBAC: https://github.com/prometheus/prometheus/blob/master/documentation/examples/rbac-setup.yml
Prometheus Docker image: https://hub.docker.com/r/prom/prometheus/
ConfigMap: https://kubernetes.io/docs/tasks/configure-pod-container/configmap/
Deployments: https://kubernetes.io/docs/concepts/workloads/controllers/deployment/
Node exporter image: https://hub.docker.com/r/prom/node-exporter/
DaemonSet: https://kubernetes.io/docs/concepts/workloads/controllers/daemonset/
Grafana: https://grafana.com
Node exporter dashboard: https://grafana.com/dashboards/22
Kubernetes pod dashboard: https://grafana.com/dashboards/737
Kubernetes dashboards: https://grafana.com/dashboards?dataSource=prometheus&search=Kubernetes
kube-state-metrics: https://github.com/kubernetes/kube-state-metrics
kube-state-metrics documentation: https://github.com/kubernetes/kube-state-metrics/tree/master/Documentation
Prometheus Operator: https://github.com/coreos/prometheus-operator
Prometheus Operator documentation: https://coreos.com/operators/prometheus/docs/latest/

The Author

Michael Kraus is a senior consultant for open source monitoring at ConSol in Munich, Germany. Since 2005, he has developed and managed the monitoring environments with Nagios and its successors. His main focus is integrating new components in a meaningful monitoring environment based exclusively on open source software.

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