Kubernetes: Preparing for the CKA and CKAD Certifications

© The Author(s), under exclusive license to APress Media, LLC , part of Springer Nature 2021

P. MartinKuberneteshttps://doi.org/10.1007/978-1-4842-6494-2_7

7. Scaling an Application

Philippe Martin¹  

(1)

Gif-sur-Yvette, France

 

We have seen in the spec of the ReplicaSet and Deployment a replicas field. This field indicates how many replicas of a Pod should be running.

Manual Scaling

In declarative form, it is possible to edit the spec of the Deployment to change the value of this field:

apiVersion: apps/v1 kind:

Deployment

metadata:

  name: nginx

  labels:

    app: nginx

spec:

  replicas: 4

  selector:

    matchLabels:

      app: nginx

  template:

    metadata:

      labels:

        app: nginx

    spec:

      containers:

      - image:  nginx

        name: nginx

In imperative ...