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ReadMe.md

Configuring Domain Names with Static IP Addresses

configuring-domain-name-static-ip

This tutorial demonstrates the following steps:

  • Reserve a static external IP address for your application
  • Configure either Service or Ingress resources to use the static IP
  • Update DNS records of your domain name to point to your application

Step 0:

GKE Cluster created us-central1-c

Step 1:

Deploy your web application

$ kubectl apply -f helloweb-deployment.yaml
deployment.apps/helloweb created

Step 2:

Expose your application

Using an Ingress

  • If you choose to expose your application using an Ingress, which creates an HTTP(S) Load Balancer, you must reserve a global static IP address. Regional IP addresses do not work with Ingress.

  • To create a global static IP address named helloweb-ip:

$ gcloud compute addresses create helloweb-ip --global
Created [https://www.googleapis.com/compute/v1/projects/gcloud-262311/global/addresses/helloweb-ip].
  • To find the static IP address you created, run the following command:
$ gcloud compute addresses describe helloweb-ip --global
address: 35.190.35.174
addressType: EXTERNAL
creationTimestamp: '2020-04-13T15:52:30.054-07:00'
description: ''
id: '4058631783476450241'
ipVersion: IPV4
kind: compute#address
name: helloweb-ip
networkTier: PREMIUM
selfLink: https://www.googleapis.com/compute/v1/projects/gcloud-262311/global/addresses/helloweb-ip
status: RESERVED

  • To expose a web application on a static IP using Ingress, you need to deploy two resources:

    • A Service with type:NodePort
    • An Ingress configured with the service name and static IP annotation

  • Use the above static IP to create a manifest file named helloweb-ingress.yaml describing these two resources:

  • Apply the helloweb-ingress.yaml manifest file to the cluster:

$ kubectl apply -f helloweb-ingress.yaml
ingress.extensions/helloweb created
service/helloweb-backend created
  • To see the reserve IP address associated with the load balancer:
$ kubectl get ingress
NAME       HOSTS   ADDRESS         PORTS   AGE
helloweb   *       35.190.35.174   80      49s

Step 3:

Visit your reserved static IP address

$ curl http://35.190.35.174
<!DOCTYPE html>
<html lang=en>
  <meta charset=utf-8>
  <meta name=viewport content="initial-scale=1, minimum-scale=1, width=device-width">
  <title>Error 404 (Not Found)!!1</title>
  <style>
    *{margin:0;padding:0}html,code{font:15px/22px arial,sans-serif}html{background:#fff;color:#222;padding:15px}body{margin:7% auto 0;max-width:390px;min-height:180px;padding:30px 0 15px}* > body{background:url(//www.google.com/images/errors/robot.png) 100% 5px no-repeat;padding-right:205px}p{margin:11px 0 22px;overflow:hidden}ins{color:#777;text-decoration:none}a img{border:0}@media screen and (max-width:772px){body{background:none;margin-top:0;max-width:none;padding-right:0}}#logo{background:url(//www.google.com/images/branding/googlelogo/1x/googlelogo_color_150x54dp.png) no-repeat;margin-left:-5px}@media only screen and (min-resolution:192dpi){#logo{background:url(//www.google.com/images/branding/googlelogo/2x/googlelogo_color_150x54dp.png) no-repeat 0% 0%/100% 100%;-moz-border-image:url(//www.google.com/images/branding/googlelogo/2x/googlelogo_color_150x54dp.png) 0}}@media only screen and (-webkit-min-device-pixel-ratio:2){#logo{background:url(//www.google.com/images/branding/googlelogo/2x/googlelogo_color_150x54dp.png) no-repeat;-webkit-background-size:100% 100%}}#logo{display:inline-block;height:54px;width:150px}
  </style>
  <a href=//www.google.com/><span id=logo aria-label=Google></span></a>
  <p><b>404.</b> <ins>That’s an error.</ins>
  <p>The requested URL <code>/</code> was not found on this server.  <ins>That’s all we know.</ins>

TDB:

Configure your domain name records

$ nslookup testservicek8s.gotdns.ch                       
Server:         192.168.1.1
Address:        192.168.1.1#53

Non-authoritative answer:
Name:   testservicek8s.gotdns.ch
Address: 34.67.51.160

Step 5:

Visit the domain

$ curl http://testservicek8s.gotdns.ch                       
Hello, world!
Version: 1.0.0
Hostname: helloweb-7f7f7474fc-ghncd

Cleaning up

  • Delete the load balancing resources:
$ kubectl delete ingress,service -l app=hello
service "helloweb" deleted
  • Release the reserved static IP
$ gcloud compute addresses delete helloweb-ip --global
The following global addresses will be deleted:
 - [helloweb-ip]

Do you want to continue (Y/n)?  Y

Deleted [https://www.googleapis.com/compute/v1/projects/gcloud-262311/global/addresses/helloweb-ip].
  • Delete the sample application:
$ kubectl delete -f helloweb-deployment.yaml
deployment.apps "helloweb" deleted