Mastering Kubernetes - Second Edition

Autoscaling with kubectl

kubectl can create an autoscale resource using the standard create command and accepting a configuration file. But kubectl also has a special command, autoscale, that lets you easily set an autoscaler in one command without a special configuration file:

1. First, let's start a replication controller that makes sure there are three replicas of a simple pod that just runs an infinite bash-loop:

apiVersion: v1 
kind: ReplicationController 
metadata: 
   name: bash-loop-rc 
spec: 
   replicas: 3 
   template: 
     metadata: 
       labels: 
         name: bash-loop-rc 
     spec: 
       containers: 
         - name: bash-loop 
           image: ubuntu 
           command: ["/bin/bash", "-c", "while true; do sleep 10;   
                      done"] 

2. Let's create a replication controller:

     > kubectl create -f bash-loop-rc.yaml ...