How to assign a static IP to a pod using Kubernetes on deployment

Question

I am trying to assign a static IP address to a pod on deployment.

apiVersion: apps/v1beta1
kind: Deployment
metadata:
  name: aws-test-mysql
spec:
  replicas: 1
  template:
    metadata:
      labels:
        app: aws-test-mysql
    spec:
      containers:
      - name: aws-test-mysql
        image: 461677341235123.dkr.ecr.us-east-1.amazonaws.com/aws-test-mysql
        securityContext:
          privileged: true
        ports:
        - containerPort: 3306
          hostIP: 172.20.32.50
          hostPort: 3306
        resources:
          requests:
            cpu: 100m
      imagePullSecrets:
        - name: ecrkey

As you can see when I described my pod it is created with another IP.

test-mbp1:aws test$ kubectl describe pods | grep IP
IP:     100.96.1.3

I'm trying to deploy a pod with a static IP on "kind: Deployment" and not as a service.

Is this posible ?

Answer 1

A static IP cannot be assigned to a Pod because of the dynamic nature of kubernetes' IP layer.

Since you don't want to attach a Service (which is the best way imho), a close alternative is to convert the Deployment to a StatefulSet. This will give the Pod a static hostname which more-or-less fulfils your requirement.

The first replica of the StatefulSet will be called aws-test-mysql-0.<kubernetes.cluster.tld>.