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Deployment Guide—Dell EMC Ready Stack for Red Hat OpenShift Container Platform 4.2

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Deploying Applications
Overview Deploying images Deploying S2I Application routes Application scaling

Application scaling

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

    Perform the following steps to scale an application. This example uses hello-openshift.

    1. Log in to the OpenShift cluster:

    oc login -u <user name>   

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

    oc project <project name>

    Now using project "<project name>" on server "https://api.ocp.example.com:6443".

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

    oc get dc

    NAME              REVISION   DESIRED   CURRENT   TRIGGERED BY

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

    1. Increase the desired count to 3 by running the following command:

    oc scale --replicas=3 dc/hello-openshift

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

     

    oc get dc

    NAME              REVISION   DESIRED   CURRENT   TRIGGERED BY

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

    Note: OpenShift Container Platform supports the autoscaling of pods if cluster metrics are installed. After installing cluster metrics, run oc autoscale dc/hello-openshift –min=1 --min=10 --cpu-percent=80. The cluster metrics feature is under Technical Preview. For more information, see the Red Hat Custom Metrics documentation.