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Installing Kubernetes Addons

With kops you manage addons by using kubectl.

(For a description of the addon-manager, please see addon_manager.md.)

Addons in Kubernetes are traditionally done by copying files to /etc/kubernetes/addons on the master. But this doesn't really make sense in HA master configurations. We also have kubectl available, and addons are just a thin wrapper over calling kubectl.

This document describes how to install some common addons.

Dashboard

The dashboard project provides a nice administrative UI:

Install using:

kubectl create -f https://raw.githubusercontent.com/kubernetes/kops/master/addons/kubernetes-dashboard/v1.8.3.yaml

And then navigate to https://api.<clustername>/ui

(/ui is an alias to https://<clustername>/api/v1/proxy/namespaces/kube-system/services/kubernetes-dashboard)

The login credentials are:

  • Username: admin
  • Password: get by running kops get secrets kube --type secret -oplaintext or kubectl config view --minify

RBAC

For k8s version > 1.6 and RBAC enabled it's necessary to add your own permission to the dashboard. Please read the RBAC docs before applying permissions.

Below you see an example giving full access to the dashboard.

apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRoleBinding
metadata:
  name: kubernetes-dashboard
  labels:
    k8s-app: kubernetes-dashboard
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: cluster-admin
subjects:
- kind: ServiceAccount
  name: kubernetes-dashboard
  namespace: kube-system

Monitoring with Heapster - Standalone

Monitoring supports the horizontal pod autoscaler.

Install using:

kubectl create -f https://raw.githubusercontent.com/kubernetes/kops/master/addons/monitoring-standalone/v1.11.0.yaml

Please note that heapster is deprecated. Consider using metrics-server and a third party metrics pipeline to gather Prometheus-format metrics instead.

Monitoring with Prometheus Operator + kube-prometheus

The Prometheus Operator makes the Prometheus configuration Kubernetes native and manages and operates Prometheus and Alertmanager clusters. It is a piece of the puzzle regarding full end-to-end monitoring.

kube-prometheus combines the Prometheus Operator with a collection of manifests to help getting started with monitoring Kubernetes itself and applications running on top of it.

kubectl apply -f https://raw.githubusercontent.com/kubernetes/kops/master/addons/prometheus-operator/v0.19.0.yaml

Route53 Mapper

Please note that kops installs a Route53 DNS controller automatically (it is required for cluster discovery). The functionality of the route53-mapper overlaps with the dns-controller, but some users will prefer to use one or the other. README for the included dns-controller

route53-mapper automates creation and updating of entries on Route53 with A records pointing to ELB-backed LoadBalancer services created by Kubernetes. Install using:

The project is created by wearemolecule, and maintained at wearemolecule/route53-kubernetes. Usage instructions

kubectl apply -f https://raw.githubusercontent.com/kubernetes/kops/master/addons/route53-mapper/v1.3.0.yml