autoscale

Creates an autoscaler that automatically chooses and sets the number of pods that run in a kubernetes cluster.

Looks up a Deployment, ReplicaSet, StatefulSet, or ReplicationController by name and creates an autoscaler that uses the given resource as a reference. An autoscaler can automatically increase or decrease number of pods deployed within the system as needed.

Command

$ kubectl autoscale (-f FILENAME | TYPE NAME | TYPE/NAME) [--min=MINPODS] --max=MAXPODS [--cpu-percent=CPU] 

[OR]

$ kubectl hpa (-f FILENAME | TYPE NAME | TYPE/NAME) [--min=MINPODS] --max=MAXPODS [--cpu-percent=CPU] 

hpa stands for Horizontal Pod Autoscale

Example

Current State

$ kubectl get pods NAME READY STATUS RESTARTS AGE nginx-6db489d4b7-zcc8h 1/1 Running 0 5s 

Command

$ kubectl autoscale deployment nginx --min=2 --max=10 --cpu-percent=80 horizontalpodautoscaler.autoscaling/nginx autoscaled 

[OR]

$ kubectl hpa deployment nginx --min=2 --max=10 --cpu-percent=80 horizontalpodautoscaler.autoscaling/nginx autoscaled 

This will make sure to auto-scale horizontally when the CPU usage hits 80%.

Output

$ kubectl get pods NAME READY STATUS RESTARTS AGE nginx-6db489d4b7-2rrrm 1/1 Running 0 15s nginx-6db489d4b7-vxqwm 1/1 Running 0 53s 

Notice that the command has an arg that says --min=2, the deployment instantaniously auto-scales to 2 pods.

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