k8s-http-router

Warning: this project is very new and might have some issues. We have been using it successfully in our testing clusters for a couple of months. Bug reports are welcome!g

This project has been pulled from the new Gondor backend built on Kubernetes. It simply routes HTTP requests to Kubernetes services using the HTTP Host header. Additional configuration can be specified, but nothing else is currently supported.

Setup

To get k8s-http-router running on your Kubernetes cluster you can use the following replication controller:

kind: ReplicationController
apiVersion: v1beta3
metadata:
    name: router
spec:
    replicas: 3
    selector:
        name: router
    template:
        metadata:
          labels:
            name: router
        spec:
          containers:
            - name: router
              image: quay.io/eldarion/k8s-http-router
              ports:
                - name: router-http
                  containerPort: 80
                - name: router-https
                  containerPort: 443

and service:

kind: Service
apiVersion: v1beta3
metadata:
    name: router
    labels:
        name: router
spec:
    selector:
        name: router
    ports:
        - name: router-http
          port: 80
        - name: router-https
          port: 443
    createExternalLoadBalancer: true

To add a service to route, use the router annotation:

kind: Service
apiVersion: v1beta3
metadata:
    name: my-website
    labels:
        name: my-website
    annotations:
        router: '{"config": {}, "hosts": ["example.com"]}'
    spec:
        selector:
            name: my-website
        ports:
            - port: 80
              targetPort: 8000

k8s-http-router will watch for service changes and keep its internal data structures up-to-date with changes in the Kubernetes service objects.

Credit

Thanks to Google for the amazing Kubernetes project.

Thanks to the flynn project for a great router design this is inspired by, but stripped down and modified for Kubernetes.