5.5. Configuring the machine autoscalers
After you deploy the cluster autoscaler, deploy MachineAutoscaler resources that reference the machine sets that are used to scale the cluster.
You must deploy at least one MachineAutoscaler resource after you deploy the ClusterAutoscaler resource.
You must configure separate resources for each machine set. Remember that machine sets are different in each region, so consider whether you want to enable machine scaling in multiple regions. The machine set that you scale must have at least one machine in it.
5.5.1. MachineAutoscaler resource definition
This MachineAutoscaler resource definition shows the parameters and sample values for the machine autoscaler.
apiVersion: "autoscaling.openshift.io/v1beta1" kind: "MachineAutoscaler" metadata: name: "worker-us-east-1a" 1 namespace: "openshift-machine-api" spec: minReplicas: 1 2 maxReplicas: 12 3 scaleTargetRef: 4 apiVersion: machine.openshift.io/v1beta1 kind: MachineSet 5 name: worker-us-east-1a 6
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- Specify the machine autoscaler name. To make it easier to identify which machine set this machine autoscaler scales, specify or include the name of the machine set to scale. The machine set name takes the following form:
<clusterid>-<machineset>-<aws-region-az> - 2
- Specify the minimum number machines of the specified type that must remain in the specified zone after the cluster autoscaler initiates cluster scaling. If running in AWS, GCP, or Azure, this value can be set to
0. For other providers, do not set this value to0. - 3
- Specify the maximum number machines of the specified type that the cluster autoscaler can deploy in the specified AWS zone after it initiates cluster scaling. Ensure that the
maxNodesTotalvalue in theClusterAutoscalerresource definition is large enough to allow the machine autoscaler to deploy this number of machines. - 4
- In this section, provide values that describe the existing machine set to scale.
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- The
kindparameter value is alwaysMachineSet. - 6
- The
namevalue must match the name of an existing machine set, as shown in themetadata.nameparameter value.
5.5.2. Deploying the machine autoscaler
To deploy the machine autoscaler, you create an instance of the MachineAutoscaler resource.
Procedure
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Create a YAML file for the
MachineAutoscalerresource that contains the customized resource definition. Create the resource in the cluster:
$ oc create -f <filename>.yaml 1- 1
<filename>is the name of the resource file that you customized.
