A limit range, defined by a LimitRange object, provides constraints that can:

• Enforce minimum and maximum compute resources usage per Pod or Container in a namespace.
• Enforce minimum and maximum storage request per PersistentVolumeClaim in a namespace.
• Enforce a ratio between request and limit for a resource in a namespace.
• Set default request/limit for compute resources in a namespace and automatically inject them to Containers at runtime.

 

bash-4.2$ kubectl describe limitranges -n ovi
Name: ovi-limitrange
Namespace: ovi
Type             Resource     Min      Max    Default Request        Default Limit       Max Limit/Request Ratio
—- ——– — — ————— ————- ————————————————————
Container     memory     64Mi     32Gi     64Mi                            512Mi                10
Container        cpu         100m     16        100m                           500m                   8

 

Edit limit range

bash-4.2$ kubectl edit limitranges -n ovi

 

 

# Please edit the object below. Lines beginning with a ‘#’ will be ignored,

2 # and an empty file will abort the edit. If an error occurs while saving this file will be

3 # reopened with the relevant failures.

4 #

5 apiVersion: v1

6 kind: LimitRange

7 metadata:

8   annotations:

9     kubectl.kubernetes.io/last-applied-configuration: |

10       {“apiVersion”:”v1″,”kind”:”LimitRange”,”metadata”:{“annotations”:{},”name”:”ovi-limitrange”,”namespace”:”ovi”},”spec”:{“limits”:[{“default”:{“cpu”:”500m”,”m        emory”:”512Mi”},”defaultRequest”:{“cpu”:”100m”,”memory”:”64Mi”},”max”:{“cpu”:”16″,”memory”:”32Gi”},”maxLimitRequestRatio”:{“cpu”:”8″,”memory”:”10″},”min”:{“cpu”:”10        0m”,”memory”:”64Mi”},”type”:”Container”}]}}

11   creationTimestamp: 2019-02-13T15:54:44Z

12   name: ovi-limitrange

13   namespace: ovi

14   resourceVersion: “127366586”

15   selfLink: /api/v1/namespaces/te20/limitranges/ovi-limitrange

16   uid: ae91e929-2fa7-11e9-9dd5-0242ac110005

17 spec:

18   limits:

19   – default:

20       cpu: 500m

21       memory: 512Mi

22     defaultRequest:

23       cpu: 100m

24       memory: 64Mi

25     max:

26       cpu: “16”

27       memory: 32Gi

28     maxLimitRequestRatio:

29       cpu: “8”

30       memory: “10”

31     min:

32       cpu: 100m

33       memory: 64Mi

34     type: Container