How to create LoadBalancer service on Pod created by ReplicaSet/Deployment

orlando

I'm using a ReplicaSet to manage my pods and I'm trying to expose these pods using a service. Pods created by a ReplicaSet have random names.

NAME                   READY   STATUS    RESTARTS   AGE
master                 2/2     Running   0          20m
worker-4szkz           2/2     Running   0          21m
worker-hwnzt           2/2     Running   0          21m

Since some policy restricts my usage, I try to expose these pods through a service hostNetwork=true. I can expose them by creating a service NodePortfor each pod kubectl expose pod worker-xxxxx --type=NodePort.

This is obviously not a flexible approach. I don't know how to create a service (maybe of type LoadBalancer?) to dynamically access all replicas in my ReplicaSet. It would also be perfect if it came with a Deployment.

Thanks for your help and advice!

edit:

I put a label on the ReplicaSet and a service called select the workerlabel on a service of type NodePort . But I can't get into ping workerany of the pods. What is the correct way to do it?

Here's how kubectl describe service workerto give. The pods are picked up as Endpointsshown.

Name:                     worker
Namespace:                default
Annotations:              <none>
Selector:                 tag=worker
Type:                     NodePort
IP:                       10.106.45.174
Port:                     port1  29999/TCP
TargetPort:               29999/TCP
NodePort:                 port1  31934/TCP
Endpoints:                10.32.0.3:29999,10.40.0.2:29999
Port:                     port2  29996/TCP
TargetPort:               29996/TCP
NodePort:                 port2  31881/TCP
Endpoints:                10.32.0.3:29996,10.40.0.2:29996
Port:                     port3  30001/TCP
TargetPort:               30001/TCP
NodePort:                 port3  31877/TCP
Endpoints:                10.32.0.3:30001,10.40.0.2:30001
Session Affinity:         None
External Traffic Policy:  Cluster
Events:                   <none>
Spazzy757

I believe you can optimize this a bit by using Deployments instead of ReplicaSets (which is now the standard approach), i.e. you can deploy like this:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  labels:
    app: nginx
spec:
  replicas: 3
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.7.9
        ports:
        - containerPort: 80

Then your matching service will be:

apiVersion: v1
kind: Service
metadata:
  name: nginx-service
spec:
  # This is the important part as this is what is used to route to 
  # the pods created by your deployment
  selector:
    app: nginx
  ports:
    - protocol: TCP
      port: 80
      targetPort: 80

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