Scheduling PODs Flashcards
Set requests and limits for a deployment
oc set resources deployment hello-world-nginx –requests cpu=10m,memory=20Mi –limits cpu=80m,memory=100Mi
Show resources consumed by a pod
oc adm top pods
shows actual usage for one or more nodes in the cluster
oc adm top nodes -l node-role.kubernetes.io/worker
List of resources that a quota can restrict by their count or number
- pods
- replicationcontrollers
- controllers
- services
- secrets
- persistentvolumeclaims
compute resources that can be restricted by a quota
- requests.cpu
- requests.memory
- requests.storage
create a resource quota is by using the oc
oc create quota dev-quota –hard services=10,cpu=1300m,memory=1.5Gi
create resource quota from file
oc create –save-config -f dev-quota.ym
Resource quota CR
list available quotas
oc get resourcequota
displays the cumulative limits set for all ResourceQuota
oc describe quota
Delete quota
oc delete resourcequota QUOTA
create a limit range resource from a YAML
oc create –save-config -f dev-limits.yml
view the limit constraints enforced in a project
oc describe limitrange dev-limits
Delete limit range
oc delete limitrange dev-limits
create a cluster quota for all projects owned by qa user
oc create clusterquota user-qa –project-annotation-selector openshift.io/requester=qa –hard pods=12,secrets=20
create cluster quota for projects labeled env=qa
oc create clusterquota env-qa –project-label-selector env=qa –hard pods=10,services=5
delete a cluster resource quota
oc delete clusterquota QUOTA
create a new template resource in the openshift-config namespace
oc create -f project-template.yaml -n openshift-config
create a new project template
oc adm create-bootstrap-project-template -o yaml > /tmp/project-template.yaml
create a horizontal pod autoscaler resource
oc autoscale deployment/hello –min 1 –max 10 –cpu-percent 80
get information about horizontal pod autoscaler resources in the current project
oc get hpa
get custer version
oc get clusterversion
Apply the latest update to your cluster or update to a specific version
- oc adm upgrade –to-latest=true
- oc adm upgrade –to=VERSION
review the status of the Cluster Version Operator (CVO)
oc get clusterversion
review the status of the install cluster operators
oc get clusteroperators
Retrieve teh console URL
oc whoami –show-console
See resource consumption by all nodes
oc adm top node
Start a shell session on the node
oc debug node/master01
Specify resources for an app using editor
- oc edit deploy/hello
- Under image and resources
- Under resources and limits or requests
- Under limits and requests and cpu, memory, services, etc.
Create a project template with specific quota and limits
- oc adm create-bootstrap-project-template > template.yaml
- Edit to add quota, limits and requests
- oc create -f template.yaml -n openshift-config
- oc patch projects.config -p ‘{“spec”:{“projectRequestTemplate”:{“name”:”project-request”}}}’ –type merge
Edit cluster to use customer project template
oc patch projects.config -p ‘{“spec”:{“projectRequestTemplate”:{“name”:”project-request”}}}’ –type merge
What objects can be limited by limit range?
- pod
- image
- persistent volume claim
- image stream
- container
Create limit range CR
Command for application creation dry run
oc create deployment loadtest –dry-run=client –image quay.io/redhattraining/loadtest:v1.0 > -o yaml
How do you watch htpasswd update progress
oc get pods -n openshift-authentication
Make admin a cluster admin
oc adm policy add-cluster-role-to-user cluster-admin admin
Update node ‘foo’ with a taint
oc adm taint nodes foo dedicated=special-user:NoSchedule
