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Creating ReplicaSets

Creating ReplicaSets

Learn how to create and retrieve a ReplicaSet.

Definition

Let’s look at a ReplicaSet named go-demo-2.yml based on the Pod we created in the previous chapter:

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apiVersion: apps/v1
kind: ReplicaSet
metadata:
name: go-demo-2
spec:
replicas: 2
selector:
matchLabels:
type: backend
service: go-demo-2
template:
metadata:
labels:
type: backend
service: go-demo-2
db: mongo
language: go
spec:
containers:
- name: db
image: mongo:3.3
- name: api
image: vfarcic/go-demo-2
env:
- name: DB
value: localhost
livenessProbe:
httpGet:
path: /demo/hello
port: 8080

Note: The apiVersion, kind, and metadata fields are mandatory with all Kubernetes objects. ReplicaSet is no exception because it’s also a Kubernetes object.

  • Line 1: We specify that the apiVersion is apps/v1.

  • Lines 2–3: The kind is ReplicaSet and metadata has the name key set to ...

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