Kubernetic

Ingresses

TIP

During this tutorial you'll learn how to manage Ingresses on Kubernetes.

  • Level: beginner
  • Requirements: none
  • Previous Tutorials: deployments, services
  • Can run on Cluster: any, GKE
  • Can run on Namespace: any
  • Images used: nginxdemos/hello:0.2

Ingressesopen in new window manages external access to the services in a cluster, typically HTTP, they may provide load balancing, SSL termination and name-based virtual hosting.

Setup Ingress Controller

WARNING

For Ingresses to be functional in your cluster, you first need to have an Ingress Controller running. As a quick example to setup a cluster locally with Ingress Controller you can use minikube:

# Start minikube
minikube start
# Enable ingress addon
minikube addons enable ingress
# annotate IP (In the example seen is "192.168.64.28")
minikube ip
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Simple fanout

A fanout configuration routes traffic from a single IP address to more than one Service, based on the HTTP URI being requested. An Ingress allows you to keep the number of load balancers down to a minimum. For example, a setup like:

192.168.64.28.xip.io -> 192.168.64.28 -> / coffee    coffee:80
                                         / tea       tea:80
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First we'll create a deployment and service for coffee:

  • Create Deployment
    • Name: coffee
    • Image: nginxdemos/hello:0.2
  • Create Service
    • Name: coffee
    • Paths:
      • Port: 80
      • Target Port: 80

Deployment Coffee

We'll also create a deployment and service for tea:

  • Create Deployment
    • Name: tea
    • Image: nginxdemos/hello:0.2
  • Create Service
    • Name: tea
    • Paths:
      • Port: 80
      • Target Port: 80

Deployment Tea

And then we'll create an Ingress rule that implements the above schema:

  • Create Ingress
    • Name: demo
    • Host: 192.168.64.28.xip.io
    • Paths:
      • Path: /coffee, Service Name: coffee, Port: 80
      • Path: /tea, Service Name: tea, Port: 80

Once we create the Ingress, we can check the following URLs are functional:

  • 192.168.64.28.xip.io/coffee: We can check that one of the Pods of coffee deployment responds.
  • 192.168.64.28.xip.io/tea: We can check that one of the Pods of tea deployment responds.

Ingress