digitalocean snippets

How to connect to a Kubernetes cluster hosted on DigitalOcean

Tagged digitalocean, kubernetes  Languages bash

Tested April, 2019.

  1. Download the Kubernetes configuration from the DigitalOcean dashboard

  2. Move the Kubernetes configuration file to ~/.kube folder 
$ mkdir $HOME/.kube/projectx/
$ mv ~/Downloads/projectx-staging-kubeconfig.yaml $HOME/.kube/projectx/staging-kubeconfig.yaml
  1. List all contexts in the KUBECONFIG variable 
$ export KUBECONFIG=$HOME/.kube/projectx/staging-kubeconfig.yaml:$HOME/.kube/projectx/production-kubeconfig.yaml
  1. Install kubectl 
$ brew install kubectl
  1. List context and nodes 
$ kubectl config get-contexts
$ kubectl get nodes
$ kubectl config use-context
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How to set up a Digital Ocean Kubernetes cluster

Tagged digitalocean, kubernetes, setup  Languages bash, yaml

How to set up a Digital Ocean Kubernetes cluster (Q1 2019).

Introduction

Overview of how a request gets from a browser to a Docker container managed by Kubernetes:

Internet[Browser => DigitalOcean LoadBalancer] => Kubernetes[Ingress => Service => Deployment => Pod] => Docker[Container]

Prerequisites

  • Install kubectl 
$ brew install kubectl
  1. Create cluster in DigitalOcean dashboard

Download the cluster configuration (YAML file) and put it in the ~/.kube folder.

  1. Set KUBECONFIG environment variable 
$ export KUBECONFIG=/Users/christian/.kube/staging-kubeconfig.yaml
$ kubectl config current-context
$ kubectl get nodes
NAME               STATUS   ROLES    AGE   VERSION
xxx-staging-qv72   Ready    <none>   70m   v1.14.1
xxx-staging-qv7p   Ready    <none>   71m   v1.14.1
xxx-staging-qv7s   Ready    <none>   71m   v1.14.1
  1. Install ingress controller 
$ kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/mandatory.yaml
$ kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/provider/cloud-generic.yaml

Get the EXTERNAL-IP of the load balancer:

$ kubectl get services --namespace=ingress-nginx
  1. Create ingress resource

ingress.yaml:

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: app-ingress
  annotations:
    ingress.kubernetes.io/rewrite-target: /
spec:
  rules:
  - http:
      paths:
        - path: /
          backend:
            serviceName: app-service
            servicePort: 80
$ kubectl apply -f ingress.yml
  1. Create deployment

deployment.yaml:

apiVersion: v1
kind: Service
metadata:
  name: app-service
spec:
  ports:
  - port: 80
    targetPort: 5678
  selector:
    app: app
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: app
spec:
  selector:
    matchLabels:
      app: app
  replicas: 1
  template:
    metadata:
      labels:
        app: app
    spec:
      containers:
      - name: app
        image: hashicorp/http-echo
        args:
        - "-text=Hello. This is your Digital Ocean k8s cluster."
        ports:
        - containerPort: 5678
$ kubectl apply -f deployment.yml
  1. Curl your app 
curl https://<EXTERNAL-IP> --insecure

References

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