Pod Scheduling

Question 1

Deploy, create a route and scale 4 pods for an app called hello using the container located at quay.io/redhattraining/hello-world-nginx:v1.0

Answer 1

$ oc new-app –name hello –image quay.io/redhattraining/hello-world-nginx:v1.0m

$ oc expose svc/hello

$oc scale –replicas 4 deployment/hello

Question 2

Label node master03 as dev (develoment), modify the deployment resource app ‘hello’ to select a development node

Answer 2

$ oc label node master03 env=dev

$oc edit deployment/hello

…
dnsPolicy: ClusterFirst
nodeSelector:
env: dev
restartPolicy: Always
…

The key is adding nodeSelector:
env: dev
As this will cause the pods to redeploy, allowing hello to run on nodes with the label dev

Question 3

Command to view and label node master02 as prod:

Answer 3

First log on as an admin user since non-admin users can’t view or label nodes.

$oc login -u admin -p password

$ oc get nodes -L env

$ oc label node master02 env=prod