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

100 daemon-set.txt

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.