Getting Started with Google Kubernetes Engine Ingress Annotations

Getting Started with Google Kubernetes Engine Ingress Annotations

Google Kubernetes Engine (GKE) is a powerful tool for managing containerized applications. One of its key features is the Ingress resource, which controls external access to services in a cluster. In this blog post, we’ll dive into the world of GKE Ingress annotations, a powerful feature that can help you customize your Ingress behavior.

What are GKE Ingress Annotations?

Ingress annotations in GKE allow you to specify how the Ingress controller should manage traffic. They are key-value pairs that can be added to the metadata of an Ingress resource. These annotations can control features like load balancing, SSL, and authentication.

Setting Up Your GKE Cluster

Before we dive into Ingress annotations, let’s set up a GKE cluster. If you already have a cluster, feel free to skip this section.

gcloud container clusters create my-cluster --zone us-central1-a

This command creates a cluster named my-cluster in the us-central1-a zone. Replace these values as needed.

Creating an Ingress Resource

Now, let’s create an Ingress resource. Here’s a simple example:

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: my-ingress
spec:
  rules:
  - host: myapp.example.com
    http:
      paths:
      - pathType: Prefix
        path: "/"
        backend:
          service:
            name: my-service
            port:
              number: 80

This Ingress resource routes traffic from myapp.example.com to a service named my-service on port 80.

Adding Annotations

Now, let’s add some annotations. Here’s an example:

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: my-ingress
  annotations:
    nginx.ingress.kubernetes.io/rewrite-target: /
spec:
  rules:
  - host: myapp.example.com
    http:
      paths:
      - pathType: Prefix
        path: "/oldpath"
        backend:
          service:
            name: my-service
            port:
              number: 80

This annotation tells the Ingress controller to rewrite the URL path from /oldpath to /. This is useful if you want to route traffic to a different path than the one specified in the request.

Common GKE Ingress Annotations

Here are some common GKE Ingress annotations:

• kubernetes.io/ingress.class: Specifies the Ingress class to use. This is useful if you have multiple Ingress controllers in your cluster.
• nginx.ingress.kubernetes.io/ssl-redirect: If set to true, redirects HTTP traffic to HTTPS. This requires an SSL certificate.
• nginx.ingress.kubernetes.io/affinity: Controls session affinity, which can be used to ensure that all requests from a client are sent to the same pod.

Conclusion

Ingress annotations in GKE are a powerful tool for customizing the behavior of your Ingress resources. They allow you to control features like load balancing, SSL, and authentication, giving you fine-grained control over how traffic is routed in your cluster.

Remember, the best way to learn is by doing. So, get out there and start experimenting with GKE Ingress annotations!

References

• Official GKE Documentation
• Kubernetes Ingress Annotations

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