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Creating Services by Exposing Ports

Creating Services by Exposing Ports

In this lesson, we will explore how to create Kubernetes Services by exposing ports.

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 we can use to demonstrate how Services work.

Let’s take a quick look at the ReplicaSet definition.

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cat svc/go-demo-2-rs.yml

The only significant difference is the db container definition. It is as follows.

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

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

Let’s ...

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