Scheduling PODs

Question 1

Set requests and limits for a deployment

Answer 1

oc set resources deployment hello-world-nginx –requests cpu=10m,memory=20Mi –limits cpu=80m,memory=100Mi

Question 2

Show resources consumed by a pod

Answer 2

oc adm top pods

Question 3

shows actual usage for one or more nodes in the cluster

Answer 3

oc adm top nodes -l node-role.kubernetes.io/worker

Question 4

List of resources that a quota can restrict by their count or number

Answer 4

• pods
• replicationcontrollers
• controllers
• services
• secrets
• persistentvolumeclaims

Question 5

compute resources that can be restricted by a quota

Answer 5

• requests.cpu
• requests.memory
• requests.storage

Question 6

create a resource quota is by using the oc

Answer 6

oc create quota dev-quota –hard services=10,cpu=1300m,memory=1.5Gi

Question 7

create resource quota from file

Answer 7

oc create –save-config -f dev-quota.ym

Question 8

Resource quota CR

Answer 8

Question 9

list available quotas

Answer 9

oc get resourcequota

Question 10

displays the cumulative limits set for all ResourceQuota

Answer 10

oc describe quota

Question 11

Delete quota

Answer 11

oc delete resourcequota QUOTA

Question 12

create a limit range resource from a YAML

Answer 12

oc create –save-config -f dev-limits.yml

Question 13

view the limit constraints enforced in a project

Answer 13

oc describe limitrange dev-limits

Question 14

Delete limit range

Answer 14

oc delete limitrange dev-limits

Question 15

create a cluster quota for all projects owned by qa user

Answer 15

oc create clusterquota user-qa –project-annotation-selector openshift.io/requester=qa –hard pods=12,secrets=20

Question 16

create cluster quota for projects labeled env=qa

Answer 16

oc create clusterquota env-qa –project-label-selector env=qa –hard pods=10,services=5

Question 17

delete a cluster resource quota

Answer 17

oc delete clusterquota QUOTA

Question 18

create a new template resource in the openshift-config namespace

Answer 18

oc create -f project-template.yaml -n openshift-config

Question 19

create a new project template

Answer 19

oc adm create-bootstrap-project-template -o yaml > /tmp/project-template.yaml

Question 20

create a horizontal pod autoscaler resource

Answer 20

oc autoscale deployment/hello –min 1 –max 10 –cpu-percent 80

Question 21

get information about horizontal pod autoscaler resources in the current project

Answer 21

oc get hpa

Question 22

get custer version

Answer 22

oc get clusterversion

Question 23

Apply the latest update to your cluster or update to a specific version

Answer 23

• oc adm upgrade –to-latest=true
• oc adm upgrade –to=VERSION

Question 24

review the status of the Cluster Version Operator (CVO)

Answer 24

oc get clusterversion

Question 25

review the status of the install cluster operators

Answer 25

oc get clusteroperators

Question 26

Retrieve teh console URL

Answer 26

oc whoami --show-console

Question 27

See resource consumption by all nodes

Answer 27

oc adm top node

Question 28

Start a shell session on the node

Answer 28

oc debug node/master01

Question 29

Specify resources for an app using editor

Answer 29

1. oc edit deploy/hello 2. Under image and resources 3. Under resources and limits or requests 4. Under limits and requests and cpu, memory, services, etc.

Question 30

Create a project template with specific quota and limits

Answer 30

1. oc adm create-bootstrap-project-template \> template.yaml 2. Edit to add quota, limits and requests 3. **oc create -f template.yaml -n openshift-config** 4. oc patch projects.config -p '{"spec":{"projectRequestTemplate":{"name":"project-request"}}}' --type merge

Question 31

Edit cluster to use customer project template

Answer 31

oc patch projects.config -p '{"spec":{"projectRequestTemplate":{"name":"project-request"}}}' --type merge

Question 32

What objects can be limited by limit range?

Answer 32

* pod * image * persistent volume claim * image stream * container

Question 33

Create limit range CR

Answer 33

Question 34

Command for application creation dry run

Answer 34

**oc create deployment loadtest --dry-run=client --image quay.io/redhattraining/loadtest:v1.0 \> -o yaml**

Question 35

How do you watch htpasswd update progress

Answer 35

oc get pods -n openshift-authentication

Question 36

Make admin a cluster admin

Answer 36

oc adm policy add-cluster-role-to-user cluster-admin admin

Question 37

Update node 'foo' with a taint

Answer 37

oc adm taint nodes foo dedicated=special-user:NoSchedule