As a system:admin user on master host:

1. Create a project

oc new-project testowyprojekt --display-name="MaciejTestProjekt"

2. On the master host, create quota definition file – let’s save it as ‘quota5.json’

{
"apiVersion": "v1",
"kind": "ResourceQuota",
"metadata": {
"name": "test5-quota"
},
"spec": {
"hard": {
"memory": "512Mi",
"cpu": "15",
"pods": "2",
"services": "4",
"replicationcontrollers":"4",
"resourcequotas":"1"
}
}
}

3. Apply the file to specify the quota

oc create -f quota5.json --namespace= testowyprojekt

4. Verify that the quota exists:

oc get -n testowyprojekt quota

5. Verify the limits

oc describe -n testowyprojekt quota test5-quota

We  can check the limits in the web console as well.

6. To apply limit ranges, create limits5.json file

{
"kind": "LimitRange",
"apiVersion": "v1",
"metadata": {
"name": "limits5",
"creationTimestamp": null
},
"spec": {
"limits": [
{
"type": "Pod",
"max": {
"cpu": "500m",
"memory": "750Mi"
},
"min": {
"cpu": "10m",
"memory": "5Mi"
}
},
{
"type": "Container",
"max": {
"cpu": "500m",
"memory": "750Mi"
},
"min": {
"cpu": "10m",
"memory": "5Mi"
},
"default": {
"cpu": "100m",
"memory": "100Mi"
}
}
]
}
}

7. Apply the limits5.json file to specify the limits.

oc create -f limits5.json --namespace=testowyprojekt

8. Review the limit ranges

oc describe limitranges limits -n testowyprojekt

9. Create POD definition file- lets called it pod5.json file

{
"kind": "Pod",
"apiVersion": "v1",
"metadata": {
"name": "openshift-testmaciej",
"creationTimestamp": null,
"labels": {
"name": "openshift-testmaciej"
}
},
"spec": {
"containers": [
{
"name": "openshift-testmaciej",
"image": "openshift/hello-openshift:v1.2.1",
"ports": [
{
"containerPort": 8080,
"protocol": "TCP"
}
],
"resources": {
},
"terminationMessagePath": "/dev/termination-log",
"imagePullPolicy": "IfNotPresent",
"capabilities": {},
"securityContext": {
"capabilities": {},
"privileged": false
}
}
],
"restartPolicy": "Always",
"dnsPolicy": "ClusterFirst",
"serviceAccount": ""
},
"status": {}
}

10. Create pod using pod5.json file

oc create -f pod5.json

11.View the POD’s details:

oc describe pod openshift-testmaciej

12. And that’s it. Because we defined the quota with a POD value of 1, it’s not possible to create more PODS than 1.