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3.4.3. Scaling up the deployment

Scale the application deployment up or down to meet workload demands.

In Kubernetes, a Deployment object defines how an application deploys. In most cases when you deploy an application, OpenShift Container Platform creates the Pod, Service, ReplicaSet, and Deployment resources for you.

When you deploy the parksmap image, a deployment resource is created. In this example, only one pod is deployed. You might want to scale up your application to keep up with user demand or to ensure that your application is always running even if one pod is down.

The following procedure scales the parksmap deployment to use two instances.

Prerequisites

  • You have deployed the parksmap front-end application.

Procedure

  • Scale your deployment from one pod instance to two pod instances by running the following command: 

    $ oc scale --replicas=2 deployment/parksmap

    Example output

    deployment.apps/parksmap scaled

Verification

  • Verify that your deployment scaled up properly by running the following command: 

    $ oc get pods

    Example output

    NAME                       READY   STATUS    RESTARTS   AGE
parksmap-5f9579955-6sng8   1/1     Running   0          7m39s
parksmap-5f9579955-8tgft   1/1     Running   0          24s

    Verify that two parksmap pods are listed.

    提示

    To scale your deployment back down to one pod instance, pass in 1 to the --replicas option: 

    $ oc scale --replicas=1 deployment/parksmap
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