15. 오라클 클라우드 - 쿠버네티스 - limit
<1> 최대 용량 제한 limit
<2> 하한선 보장 Request
<3> 삭제
<1> 최대 용량 제한 limit
1
topasvga@cloudshell:~ (ap-seoul-1)$ cat << EOF > limit-pod.yaml
> apiVersion: v1
> kind: Pod
> metadata:
> name: limit-pod
> spec:
> containers:
> - name: ubuntu
> image: ubuntu
> command: ["tail"]
> args: ["-f", "/dev/null"]
> resources:
> limits:
> memory: "256Mi"
> cpu: "250m"
> EOF
2
topasvga@cloudshell:~ (ap-seoul-1)$ kubectl apply -f limit-pod.yaml
pod/limit-pod created
3
topasvga@cloudshell:~ (ap-seoul-1)$ kubectl describe pod limit-pod | grep Limits -A 5
Limits:
cpu: 250m
memory: 256Mi
Requests:
cpu: 250m
memory: 256Mi
4
topasvga@cloudshell:~ (ap-seoul-1)$ kubectl get nodes
NAME STATUS ROLES AGE VERSION
10.0.10.141 Ready node 7d21h v1.25.4
10.0.10.80 Ready node 7d21h v1.25.4
5
topasvga@cloudshell:~ (ap-seoul-1)$ alias k=kubectl
topasvga@cloudshell:~ (ap-seoul-1)$ complete -F __start_kubectl k
topasvga@cloudshell:~ (ap-seoul-1)$ k get pod -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
limit-pod 1/1 Running 0 2m34s 10.244.0.75 10.0.10.80 <none> <none>
6
topasvga@cloudshell:~ (ap-seoul-1)$ kubectl describe nodes 10.0.10.80
Name: 10.0.10.80
Roles: node
Labels: beta.kubernetes.io/arch=amd64
beta.kubernetes.io/instance-type=VM.Standard.E3.Flex
:
Non-terminated Pods: (6 in total)
Namespace Name CPU Requests CPU Limits Memory Requests Memory Limits Age
--------- ---- ------------ ---------- --------------- ------------- ---
default limit-pod 250m (12%) 250m (12%) 256Mi (1%) 256Mi (1%) 3m10s
kube-system coredns-d95cc75c9-qkdt7 100m (5%) 0 (0%) 70Mi (0%) 170Mi (1%) 21h
Allocated resources:
(Total limits may be over 100 percent, i.e., overcommitted.)
Resource Requests Limits
-------- -------- ------
cpu 530m (26%) 2250m (112%)
memory 510Mi (3%) 1482Mi (9%)
ephemeral-storage 0 (0%) 0 (0%)
hugepages-1Gi 0 (0%) 0 (0%)
hugepages-2Mi 0 (0%) 0 (0%)
Events: <none>
7
topasvga@cloudshell:~ (ap-seoul-1)$ kubectl delete -f limit-pod.yaml
pod "limit-pod" deleted
<2> 하한선 보장 Request
1
최소 사용량(하한선) 보장
topasvga@cloudshell:~ (ap-seoul-1)$ cat << EOF > request-limit-pod.yaml
> apiVersion: v1
> kind: Pod
> metadata:
> name: request-limit-pod
> spec:
> containers:
> - name: ubuntu
> image: ubuntu
> command: ["tail"]
> args: ["-f", "/dev/null"]
> resources:
> limits:
> memory: "256Mi"
> cpu: "250m"
> requests:
> memory: "128Mi"
> cpu: "125m"
> EOF
2
topasvga@cloudshell:~ (ap-seoul-1)$ kubectl apply -f request-limit-pod.yaml
pod/request-limit-pod created
3
topasvga@cloudshell:~ (ap-seoul-1)$ kubectl describe pod request-limit-pod | grep Limits -A 5
Limits:
cpu: 250m
memory: 256Mi
Requests:
cpu: 125m
memory: 128Mi
4
파드가 생성된 노드가 어디인지 보자
topasvga@cloudshell:~ (ap-seoul-1)$ k get pod -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
request-limit-pod 1/1 Running 0 26s 10.244.0.76 10.0.10.80 <none> <none>
5
node 상세 내용 보자
topasvga@cloudshell:~ (ap-seoul-1)$ k describe nodes 10.0.10.80
Name: 10.0.10.80
Roles: node
Labels: beta.kubernetes.io/arch=amd64
beta.kubernetes.io/instance-type=VM.Standard.E3.Flex
:
OS Image: Oracle Linux Server 8.6
Operating System: linux
Architecture: amd64
Container Runtime Version: cri-o://1.25.1-111.el8
Kubelet Version: v1.25.4
Kube-Proxy Version: v1.25.4
PodCIDR: 10.244.0.0/25
PodCIDRs: 10.244.0.0/25
ProviderID: ocid1.instance.oc1.ap-seoul-1.anuwgljr5srof4icr7w3nbsco4dl7pdbe6mkhgqdpgwv25pfxkfx6lrrhfjq
Non-terminated Pods: (6 in total)
Namespace Name CPU Requests CPU Limits Memory Requests Memory Limits Age
--------- ---- ------------ ---------- --------------- ------------- ---
default request-limit-pod 125m (6%) 250m (12%) 128Mi (0%) 256Mi (1%) 51s
kube-system coredns-d95cc75c9-qkdt7 100m (5%) 0 (0%) 70Mi (0%) 170Mi (1%) 21h
Allocated resources:
(Total limits may be over 100 percent, i.e., overcommitted.)
Resource Requests Limits
-------- -------- ------
cpu 405m (20%) 2250m (112%)
memory 382Mi (2%) 1482Mi (9%)
ephemeral-storage 0 (0%) 0 (0%)
hugepages-1Gi 0 (0%) 0 (0%)
hugepages-2Mi 0 (0%) 0 (0%)
Events: <none>
<4> 삭제
topasvga@cloudshell:~ (ap-seoul-1)$ kubectl delete -f request-limit-pod.yaml
pod "request-limit-pod" deleted
감사합니다.
