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A Practical Guide to Kubernetes

Creating Services by Exposing Ports

Explore how to create Kubernetes Services by exposing ports on ReplicaSets to enable stable and accessible communication between Pods. Understand different Service types such as NodePort and ClusterIP, and learn to configure them for external and internal access within a cluster.

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Creating ReplicaSets

Before we dive into Services, we should create a ReplicaSet similar to the one we used in the previous chapter. It’ll provide the Pods that we can use to demonstrate how Services work.

Let’s look at the ReplicaSet definition go-demo-2-rs. The only significant difference is the db container definition:

YAML
...
- name: db
  image: mongo:3.3
  command: ["mongod"]
  args: ["--rest", "--httpinterface"]
  ports:
  - containerPort: 28017
    protocol: TCP
...

We customize the command and the arguments so that MongoDB exposes the REST interface. We also define the containerPort. Those additions are needed so that we can test that the database is accessible through the Service.

Let’s create the ReplicaSet:

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