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

Chapter 13 ■ Using Autoscaling
Table 13-1. HorizontalPodAutoscaler Spec Fields
Field
Description
scaleTargetRef
The target resource to be scaled. Can be a Deployment,
ReplicaSet or ReplicationController.
minReplicas The minimum number of pods. Default is 1.
maxReplicas
The maximum number of pods. Cannot be less than
minReplicas.
targetCPUUtilizationPercentage
The target average CPU utilization. If not specified, a default
autoscaler policy is used,
The kubectl autoscale command has the following syntax, which essentially provides the same
settings as the specification.
kubectl autoscale (-f FILENAME | TYPE NAME | TYPE/NAME) [--min=MINPODS] --max=MAXPODS
[--cpu-percent=CPU] [flags]
Some of the options supported by kubectl autoscale are as discussed in Table 13-2.
Table 13-2. kubectl autoscale Options
Option Description Default Value Required (explicit
or default)
--cpu-percent
-f, --filename
--max
--min
--name
The target average
CPU utilization over
all the pods in the
resource represented
as a percentage of the
CPU requests. If not set
or negative, a default
autoscaling policy is
used.
File name, directory, or
URL for the resource to
autoscale.
Upper limit for the
number of pods.
Lower limit for the
number of pods. If not
specified or –ve a default
value is used.
The name of the newly
created object.
-1 Yes
[] Yes
-1 Yes
-1 Yes
“” No
Using the kubectl autoscale command, create a horizontal pod autoscaler. Set target CPU utilization
to 100% and set minimum number of pods to 3 and maximum number of pods to 10.
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