8. 오라클 클라우드 - 쿠버네티스 - 데몬셋
<1> 데몬셋 ?
<2> Oracle Cloud 에서 데몬셋 사용
<1> 데몬셋 ?
모든 노드에 Pod를 1개씩 생성해주는 오브젝트 , node당 1개씩 pod가 생긴다.
pod를 삭제 하더라도 데몬셋에 의해 자동으로 pod가 재 생성 된다.
기본 work node에만 생성 된다. 마스터 노드는 생성되지 않는다.생성하려면 따로 옵션을 줘야 한다.
데몬셋은 리플리카 세트가 필요 없어 리플리카 세트는 사용하지 않는다.
<2> Oracle Cloud 에서 데몬셋 사용
topasvga@cloudshell:~ (ap-seoul-1)$ kubectl get daemonsets.apps -n kube-system
NAME DESIRED CURRENT READY UP-TO-DATE AVAILABLE NODE SELECTOR AGE
csi-oci-node 2 2 2 2 2 <none> 6d20h
kube-flannel-ds 2 2 2 2 2 <none> 6d20h
kube-proxy 2 2 2 2 2 beta.kubernetes.io/os=linux 6d20h
nvidia-gpu-device-plugin 0 0 0 0 0 <none> 6d20h
proxymux-client 2 2 2 2 2 node.info.ds_proxymux_client=true 6d20h
2
topasvga@cloudshell:~ (ap-seoul-1)$ cat << EOF > daemonset-1.yaml
> apiVersion: apps/v1
> kind: DaemonSet
> metadata:
> name: daemonset-1
> spec:
> selector:
> matchLabels:
> name: daemonset-cndk
> template:
> metadata:
> labels:
> name: daemonset-cndk
> spec:
> containers:
> - name: daemonset-pod
> image: nginx
> EOF
3
topasvga@cloudshell:~ (ap-seoul-1)$ kubectl apply -f daemonset-1.yaml
daemonset.apps/daemonset-1 created
4
pod , ds 보기~
topasvga@cloudshell:~ (ap-seoul-1)$ kubectl get pods,ds -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
pod/daemonset-1-b4t49 1/1 Running 0 12s 10.244.0.54 10.0.10.80 <none> <none>
pod/daemonset-1-k4czb 1/1 Running 0 12s 10.244.0.162 10.0.10.141 <none> <none>
NAME DESIRED CURRENT READY UP-TO-DATE AVAILABLE NODE SELECTOR AGE CONTAINERS IMAGES SELECTOR
daemonset.apps/daemonset-1 2 2 2 2 2 <none> 12s daemonset-pod nginx name=daemonset-cndk
5
pod 라벨 보기~
topasvga@cloudshell:~ (ap-seoul-1)$ kubectl get pod --show-labels
NAME READY STATUS RESTARTS AGE LABELS
daemonset-1-b4t49 1/1 Running 0 108s controller-revision-hash=749f4f6bc8,name=daemonset-cndk,pod-template-generation=1
daemonset-1-k4czb 1/1 Running 0 108s controller-revision-hash=749f4f6bc8,name=daemonset-cndk,pod-template-generation=1
6
파드 삭제해 보기
파드는 유지 된다.
topasvga@cloudshell:~ (ap-seoul-1)$ kubectl get pod,ds
NAME READY STATUS RESTARTS AGE
pod/daemonset-1-lpsp8 1/1 Running 0 12s
pod/daemonset-1-md6lx 1/1 Running 0 12s
NAME DESIRED CURRENT READY UP-TO-DATE AVAILABLE NODE SELECTOR AGE
daemonset.apps/daemonset-1 2 2 2 2 2 <none> 12s
topasvga@cloudshell:~ (ap-seoul-1)$ kubectl delete pod --all
pod "daemonset-1-lpsp8" deleted
pod "daemonset-1-md6lx" deleted
topasvga@cloudshell:~ (ap-seoul-1)$ kubectl get pod,ds
NAME READY STATUS RESTARTS AGE
pod/daemonset-1-5b5tf 1/1 Running 0 4s
pod/daemonset-1-s8skp 0/1 ContainerCreating 0 4s
NAME DESIRED CURRENT READY UP-TO-DATE AVAILABLE NODE SELECTOR AGE
daemonset.apps/daemonset-1 2 2 1 2 1 <none> 28s
topasvga@cloudshell:~ (ap-seoul-1)$ kubectl get pod,ds
NAME READY STATUS RESTARTS AGE
pod/daemonset-1-5b5tf 1/1 Running 0 10s
pod/daemonset-1-s8skp 1/1 Running 0 10s
NAME DESIRED CURRENT READY UP-TO-DATE AVAILABLE NODE SELECTOR AGE
daemonset.apps/daemonset-1 2 2 2 2 2 <none> 34s
7
topasvga@cloudshell:~ (ap-seoul-1)$ kubectl get ds -o wide
NAME DESIRED CURRENT READY UP-TO-DATE AVAILABLE NODE SELECTOR AGE CONTAINERS IMAGES SELECTOR
daemonset-1 2 2 2 2 2 <none> 6m9s daemonset-pod nginx name=daemonset-cndk
8
데몬셋 지우기
topasvga@cloudshell:~ (ap-seoul-1)$ kubectl delete ds daemonset-1
daemonset.apps "daemonset-1" deleted
9
확인
topasvga@cloudshell:~ (ap-seoul-1)$ kubectl get ds -o wide
No resources found in default namespace.
감사합니다.
