Applications are designed and created to meet the demands of customers and can be scaled up or down based on business needs.

To scale an application, follow these steps.

Note: This example uses hello-openshift.

1. Log in to the OpenShift cluster:

[core@csah ~]$ oc login -u <user name>

2. Switch to the project under which the application is running:

[core@csah ~]$ oc project sample

Now using project "sample" on server "https://api.ocp.example.com:6443".

3. Identify the deployment configuration that is associated with the application:

[core@csah ~]$ oc get dc

NAME              REVISION   DESIRED   CURRENT   TRIGGERED BY

hello-openshift   1          3         3         config,image(hello-openshift:latest)

4. Increase the DESIRED count to 3:

[core@csah ~]$ oc scale --replicas=3 dc/hello-openshift

deploymentconfig.apps.openshift.io/hello-openshift scaled

[core@csah ~]$ oc get dc

NAME              REVISION   DESIRED   CURRENT   TRIGGERED BY

Hello-openshift     1           3         3        config,image(hello-openshift:latest)

Note: OpenShift supports the autoscaling of pods if cluster metrics are installed. Run oc autoscale dc/hello-openshift –min=1 --min=10 --cpu-percent=80 under Technology Preview. For more information about enabling cluster metrics for pods, see Exposing custom application metrics for autoscaling in the OpenShift Container Platform documentation.