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kubernetes-lb-controller

Maintainers: feitnomore

This is a simple weekend hack to implement a controller for Kubernetes responsible for assigning External IPs to Services of type LoadBalancer on a Bare Metal/Traditional VM environment. In my case, I do this through aliases on the public interface, but can be done on multi-home environments as well.

WARNING: Use it at your own risk.

BUILD

Here you can find some simple information on how to build this project by yourself.

Clone the Repository

git clone https://github.com/feitnomore/kubernetes-lb-controller.git

Make your changes

Note: Remember to edit Dockerfile according to your changes.

Build the Image

cd kubernetes-lb-controller
docker build -t kubernetes-lb-controller .

Push the image to the Repository

export MY_REPO="my_local_repository"
docker tag kubernetes-lb-controller:latest $MY_REPO/kubernetes-lb-controller:latest
docker push $MY_REPO/kubernetes-lb-controller:latest

Note: Remember to set MY_REPO.

Create the ConfigMap Descriptor

Create a simple ConfigMap.yaml file:

apiVersion: v1
kind: ConfigMap
metadata:
  name: kubernetes-lb-controller 
  namespace: kube-system
  labels:
    k8s-app: kubernetes-lb-controller
data:
  default: |-
     192.168.55.10
     192.168.55.11
     192.168.55.12

Apply the ConfigMap

kubectl apply -f ConfigMap.yaml

Create the Deployment Descriptor

Create a simple Deployment.yaml file:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: kubernetes-lb-controller
  namespace: kube-system
  labels:
    k8s-app: kubernetes-lb-controller
spec:
  selector:
    matchLabels:
      k8s-app: kubernetes-lb-controller
  replicas: 1
  strategy:
    type: Recreate
  template:
    metadata:
      labels:
        k8s-app: kubernetes-lb-controller
    spec:
      containers:
        - name: kubernetes-lb-controller
          image: my_local_repository/kubernetes-lb-controller:latest
          imagePullPolicy: Always
          volumeMounts:
          - name: config-volume
            mountPath: /etc/config
      volumes:
        - name: config-volume
          configMap:
            name: kubernetes-lb-controller
      serviceAccountName: kubernetes-lb-controller
      restartPolicy: Always

Note: Remember to set the image to the repository you used in the last step.

Execute the Deployment

kubectl apply -f Deployment.yaml

Note: Remember to create the ServiceAccount, ClusterRole and ClusterRoleBinding before executing the Deployment. Check examples for further information on the ServiceAccount and ClusterRole.