148422597X Kubernetes Management Design Patterns [Vohra 2017-01-29] {E559F6BB}

Chapter 13 ■ Using Autoscaling
./kubectl autoscale rc php-apache --cpu-percent=100 --min=3 --max=10
The deployment is autoscaled and an HPA is created, as shown in Figure 13-11.
Figure 13-11. Creating a horizontal pod autoscaler
List the HPA:
./kubectl get hpa
The single HPA should be listed as shown in Figure 13-12. The TARGET column lists the target CPU
utilization, the CURRENT column lists the current CPU utilization, the MINPODS column lists the minimum
number of pods, and the MAXPODS lists the maximum number of pods. Because the CPU utilization takes a
while to be monitored by heapster, the CURRENT column is indicating a value of <waiting>.
Figure 13-12. Listing the horizontal pod autoscaler
List the pods. The number of pods has increased from 1 in the initial deployment to 3 (the minimum
number of pods in the HPA) as shown in Figure 13-13.
Figure 13-13. Number of pods scaled to the minimum number of pods in the horizontal pod autoscaler
List the HPA again, and the CURRENT CPU utilization is at 0% as no load is being put on the
deployment as shown in Figure 13-14.
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