Resource Quota:
Object Base:
Number of pods per namespace
Compute Base:
cpu
memory
root@ip-172-31-3-126:~# kubectl create ns devns
namespace/devns created
root@ip-172-31-3-126:~# kubectl describe ns devns
Name: devns
Labels: kubernetes.io/metadata.name=devns
Annotations: <none>
Status: Active
No resource quota.
No LimitRange resource.
root@ip-172-31-3-126:~#
root@ip-172-31-3-126:~# kubectl explain resourcequota
KIND: ResourceQuota
VERSION: v1
DESCRIPTION:
ResourceQuota sets aggregate quota restrictions enforced per namespace
FIELDS:
apiVersion <string>
APIVersion defines the versioned schema of this representation of an
object. Servers should convert recognized schemas to the latest internal
value, and may reject unrecognized values. More info:
https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#resources
kind <string>
Kind is a string value representing the REST resource this object
represents. Servers may infer this from the endpoint the client submits
requests to. Cannot be updated. In CamelCase. More info:
https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds
metadata <Object>
Standard object's metadata. More info:
https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#metadata
spec <Object>
Spec defines the desired quota.
https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#spec-and-status
status <Object>
Status defines the actual enforced quota and its current usage.
https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#spec-and-status
===============
root@ip-172-31-3-126:~# cat myquota.yml
apiVersion: v1
kind: ResourceQuota
metadata:
name: myquota
spec:
hard:
pods: 2
===========
root@ip-172-31-3-126:~#
root@ip-172-31-3-126:~# kubectl apply -f myquota.yml -n devns
resourcequota/myquota created
root@ip-172-31-3-126:~# kubectl describe ns devns
Name: devns
Labels: kubernetes.io/metadata.name=devns
Annotations: <none>
Status: Active
Resource Quotas
Name: myquota
Resource Used Hard
-------- --- ---
pods 0 2
No LimitRange resource.
root@ip-172-31-3-126:~#
================
pod yml:
apiVersion: v1
kind: Pod
metadata:
name: mypod1
labels:
type: devpod
spec:
containers:
- name: my-container
image: nginx
=========================
Create two Pods
root@ip-172-31-3-126:~# kubectl get pods -n devns
NAME READY STATUS RESTARTS AGE
mypod1 1/1 Running 0 3m8s
mypod2 1/1 Running 0 2m33s
root@ip-172-31-3-126:~#
root@ip-172-31-3-126:~# kubectl describe ns devns
Name: devns
Labels: kubernetes.io/metadata.name=devns
Annotations: <none>
Status: Active
Resource Quotas
Name: myquota
Resource Used Hard
-------- --- ---
pods 2 2
No LimitRange resource.
root@ip-172-31-3-126:~#
Now our resource quota is fulll..
On trying to create new pod we will get below error.
root@ip-172-31-3-126:~# kubectl run webserver --image=nginx -n devns
Error from server (Forbidden): pods "webserver" is forbidden: exceeded quota: myquota, requested: pods=1, used: pods=2, limited: pods=2
root@ip-172-31-3-126:~#
Compute Base Quota:
creta yml with below details:
------------
apiVersion: v1
kind: ResourceQuota
metadata:
name: myquota
spec:
hard:
requests.cpu: 0.5
requests.memory: 500Mi
limits.cpu: 1
limits.memory: 1Gi
=-------------
root@ip-172-31-3-126:~# kubectl apply -f myquota.yml -n testns
resourcequota/myrsourcequota created
root@ip-172-31-3-126:~# kubectl describe ns testns
Name: testns
Labels: kubernetes.io/metadata.name=testns
Annotations: <none>
Status: Active
Resource Quotas
Name: myrsourcequota
Resource Used Hard
-------- --- ---
limits.cpu 0 1
limits.memory 0 1Gi
requests.cpu 0 500m
requests.memory 0 500Mi
No LimitRange resource.
root@ip-172-31-3-126:~#
root@ip-172-31-3-126:~# kubectl get resourcequota -n testns
NAME AGE REQUEST LIMIT
myrsourcequota 2m36s requests.cpu: 0/500m, requests.memory: 0/500Mi limits.cpu: 0/1, limits.memory: 0/1Gi
root@ip-172-31-3-126:~#
root@ip-172-31-3-126:~# kubectl run webserver --image=nginx -n testns
Error from server (Forbidden): pods "webserver" is forbidden: failed quota: myrsourcequota: must specify limits.cpu,limits.memory,requests.cpu,requests.memory
root@ip-172-31-3-126:~#
We cant run pod without resource details..
Create beow yml file with resource details:
apiVersion: v1
kind: Pod
metadata:
name: mypod1
labels:
type: devpod
spec:
containers:
- name: my-container
image: nginx
resources:
requests:
memory: 250Mi
cpu: 0.1
limits:
cpu: 0.5
memory: 500Mi
===
root@ip-172-31-3-126:~# kubectl apply -f mypod.yml -n testns
pod/mypod1 created
root@ip-172-31-3-126:~# kubectl describe ns testns
Name: testns
Labels: kubernetes.io/metadata.name=testns
Annotations: <none>
Status: Active
Resource Quotas
Name: myrsourcequota
Resource Used Hard
-------- --- ---
limits.cpu 500m 1
limits.memory 500Mi 1Gi
requests.cpu 100m 500m
requests.memory 250Mi 500Mi
No LimitRange resource.
root@ip-172-31-3-126:~# kubectl apply -f mypod.yml -n testns
pod/mypod2 created
root@ip-172-31-3-126:~# kubectl describe ns testns
Name: testns
Labels: kubernetes.io/metadata.name=testns
Annotations: <none>
Status: Active
Resource Quotas
Name: myrsourcequota
Resource Used Hard
-------- --- ---
limits.cpu 1 1
limits.memory 1000Mi 1Gi
requests.cpu 200m 500m
requests.memory 500Mi 500Mi
No LimitRange resource.
root@ip-172-31-3-126:~#
Now our resource limit reached to hard limit..
We cant create pod
root@ip-172-31-3-126:~# kubectl apply -f mypod.yml -n testns
Error from server (Forbidden): error when creating "mypod.yml": pods "mypod3" is forbidden: exceeded quota: myrsourcequota, requested: limits.cpu=500m,limits.memory=500Mi,requests.memory=250Mi, used: limits.cpu=1,limits.memory=1000Mi,requests.memory=500Mi, limited: limits.cpu=1,limits.memory=1Gi,requests.memory=500Mi
root@ip-172-31-3-126:~#
=======
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