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Challenge 10: Networking, DNS, and Ingress

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Introduction

We started out with some very simple, default networking that Kubernetes gives us for free. But this is rarely what we'll need to go into production. Now we'll get a little more in depth on networking in Kubernetes, and investigate DNS as well as Ingress Controllers.

Description

In this challenge you will be enabling DNS, installing an Ingress Controller and learning how the "Ingress" resource in Kubernetes works.

Part 1: DNS for Public IPs

In the previous challenges, we accessed our service via an IP address. Humans prefer names to IP addresses, so let's create a DNS name for accessing our service.

  1. Your first task is to add a dns label to your content-web service.
  2. Your service should now be available at the url http://[myserviceuniquelabel].[location].cloudapp.azure.com.
  3. Verify that the DNS record has been created (nslookup or dig), and then test this url in your browser.
  4. Discuss with your coach how you might link a 'real' DNS name (eg, conferenceinfo.fabmedical.com) with this "azure-specific" DNS name (eg, conferenceinfo.eastus.cloudapp.azure.com)

Part 2a: Ingress Controller

Switching gears, we will now start working with ingress controllers, which allow you to route http requests.

  1. Delete the existing content-web service.
  2. Create an nginx ingress controller. (Hint: use helm)
  3. Deploy the content-web service and create an Ingress resource for it.
    • The reference template (which will need editing!) can be found in the Challenge 10 Resources folder: template-web-ingress-deploy.yaml
  4. Show your coach that you can access the ingress in your browser via IP address

Part 2b: Ingress Controller + DNS for Public IPs

Just like in part 1, you will now add a metadata annotation to the ingress controller to configure a dns name.

  1. Your first challenge is to determine how to add a dns label to the ingress controller that you deployed using helm. Note the following:
    • You already have an ingress controller (from step 2a) so you don't need to create a new one or do a fresh install.
    • Ignore any notes about creating and using a static IP. For this challenge, a dynamic IP is fine.
    • Don't forget to add the host name to your ingress YAML template.
  2. Verify that the DNS record has been created (nslookup or dig), and then access the application using the DNS name, e.g:
    • http://[new-dns-label].[REGION].cloudapp.azure.com

Success Criteria

  1. The nginx Ingress Controller is installed in your cluster
  2. You've recreated a new Ingress for content-web that allows access through a domain name.

Learning Resources

Make sure you review these! (Hint Hint)