영구 저장소(persistent storage - gke)
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# 1. Create PVs and PVCs
## Connect to the lab GKE cluster
```
$export my_zone=us-central1-a
$export my_cluster=standard-cluster-1
$source <(kubectl completion bash)
$gcloud container clusters get-credentials $my_cluster --zone $my_zone
Fetching cluster endpoint and auth data.
kubeconfig entry generated for standard-cluster-1.
```
## Create and apply a manifest with a PVC
pvc-demo.yaml
```
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: hello-web-disk
spec:
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 30Gi
```
```
$git clone https://github.com/GoogleCloudPlatform/training-data-analyst
$ln -s ~/training-data-analyst/courses/ak8s/v1.1 ~/ak8s
$cd ~/ak8s/Storage/
```
### 현재 PVC를 보여 준다
```
$$kubectl get persistentvolumeclaim
```
현재는 없ㅎ다.
```
No resources found in default namespace.
```
### PVC만든다.
```
kubectl apply -f pvc-demo.yaml
```
### 다시 조회
```
NAME STATUS VOLUME CAP ACCESS MODES CLASS AGE
hello-web-disk Bound pvc-8...34 30Gi RWO standard 5s
```
생겼다.
# 2. Mount and verify Google Cloud persistent disk PVCs in Pods
## Mount the PVC to a Pod
**`pod-volume-demo.yaml`**
```
kind: Pod
apiVersion: v1
metadata:
name: pvc-demo-pod
spec:
containers:
- name: frontend
image: nginx
volumeMounts:
- mountPath: "/var/www/html"
name: pvc-demo-volume
volumes:
- name: pvc-demo-volume
persistentVolumeClaim:
claimName: hello-web-disk
```
### 만든다.
```
$kubectl apply -f pod-volume-demo.yaml
```
만들어 졌다.
```
pod/pvc-demo-pod created
```
### 확인
```
$kubectl get pods
NAME READY STATUS RESTARTS AGE
pvc-demo-pod 1/1 Running 0 28s
```
### 셀세션 시작
```
kubectl exec -it pvc-demo-pod -- sh
```
```
echo Test webpage in a persistent volume!>/var/www/html/index.html
chmod +x /var/www/html/index.html
exet
```
## Test the persistence of the PV
### 1. 지운다. pvc-demo-pod.
$`kubectl delete pod pvc-demo-pod`
```
pod "pvc-demo-pod" deleted
```
### 2. 확인 한다.
$`kubectl get pods`
지워졌다.
```
No resources found in default namespace.
```
### 3. PVC를 확인
$`kubectl get persistentvolumeclaim`
```
NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
hello-web-disk Bound pvc- 30Gi RWO standard 7m43s
```
### 4. pvc-demo-pod 재 패포
$`kubectl apply -f pod-volume-demo.yaml`
Output
```
pod/pvc-demo-pod created
```
### 5. pvc-demoe-pod 쉘 접속
$`kubectl exec -it pvc-demo-pod -- sh`
접속되면 #으로 바뀐다.
#`cat /var/www/html/index.html`
Output
```
Test webpage in a persistent volume!
```
빠져 나온다.
#`exit`
![image](https://user-images.githubusercontent.com/16316626/152635602-49876939-5ec1-43d7-ade9-5e5c0e8de593.png)
# 3.Create StatefulSets with PVCs
> 이 작업에서는 StatefulSet에서 PVC를 사용합니다.
> StatefulSet은 포드에 고유 식별자가 제공된다는 점을 제외하고는 배포와 같습니다.
## Release the PVC
### pvc-demo-pod 삭제
$`kubectl delete pod pvc-demo-pod`
지워졌졌음.
```
pod "pvc-demo-pod" deleted
```
확인
`kubectl get pods`
결과
```
No resources found in default namespace.
```
## Create a StatefulSet
스테이플셋 생성
**statefulset-demo.yaml**
```
kind: Service
apiVersion: v1
metadata:
name: statefulset-demo-service
spec:
ports:
- protocol: TCP
port: 80
targetPort: 9376
type: LoadBalancer
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
name: statefulset-demo
spec:
selector:
matchLabels:
app: MyApp
serviceName: statefulset-demo-service
replicas: 3
updateStrategy:
type: RollingUpdate
template:
metadata:
labels:
app: MyApp
spec:
containers:
- name: stateful-set-container
image: nginx
ports:
- containerPort: 80
name: http
volumeMounts:
- name: hello-web-disk
mountPath: "/var/www/html"
volumeClaimTemplates:
- metadata:
name: hello-web-disk
spec:
accessModes: [ "ReadWriteOnce" ]
resources:
requests:
storage: 30Gi
```
### 생성
$`kubectl apply -f statefulset-demo.yaml`
로드벨런싱 되는 서비스와, 30G 볼륨이 생성되었음.
`hello-web-disk` `/var/www/html` 마운트 욈
```sh
service/statefulset-demo-service created
statefulset.apps/statefulset-demo created
```
## Verify the connection of Pods in StatefulSets
StatefulSet에서 포드의 연결 확인
### 세부 정보 확인
$`kubectl describe statefulset statefulset-demo`
Output
```
Name: statefulset-demo
Namespace: default
CreationTimestamp: Sat, 05 Feb 2022 09:11:44 +0000
Selector: app=MyApp
Labels:
Annotations:
Replicas: 3 desired | 3 total
Update Strategy: RollingUpdate
Pods Status: 3 Running / 0 Waiting / 0 Succeeded / 0 Failed
Pod Template:
Labels: app=MyApp
Containers:
stateful-set-container:
Image: nginx
Port: 80/TCP
Host Port: 0/TCP
Environment:
Mounts:
/var/www/html from hello-web-disk (rw)
Volumes:
Volume Claims:
Name: hello-web-disk
StorageClass:
Labels:
Annotations:
Capacity: 30Gi
Access Modes: [ReadWriteOnce]
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal SuccessfulCreate 2m52s statefulset-controller create Claim hello-web-disk-statefulset-demo-0 Pod statefulset-demo-0 in StatefulSet statefulset-demo success
Normal SuccessfulCreate 2m52s statefulset-controller create Pod statefulset-demo-0 in StatefulSet statefulset-demo successful
Normal SuccessfulCreate 2m38s statefulset-controller create Claim hello-web-disk-statefulset-demo-1 Pod statefulset-demo-1 in StatefulSet statefulset-demo success
Normal SuccessfulCreate 2m38s statefulset-controller create Pod statefulset-demo-1 in StatefulSet statefulset-demo successful
Normal SuccessfulCreate 2m24s statefulset-controller create Claim hello-web-disk-statefulset-demo-2 Pod statefulset-demo-2 in StatefulSet statefulset-demo success
Normal SuccessfulCreate 2m24s statefulset-controller create Pod statefulset-demo-2 in StatefulSet statefulset-demo successful
```
### 포드 리스트 확인
$`keubectl get pods`
```
NAME READY STATUS RESTARTS AGE
statefulset-demo-0 1/1 Running 0 4m14s
statefulset-demo-1 1/1 Running 0 4m
statefulset-demo-2 1/1 Running 0 3m46s
```
### PVC 확인
$`kubectl get pvc`
```
NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
hello-web-disk Bound pvc-80 30Gi RWO standard 20m
hello-web-disk-statefulset-demo-0 Bound pvc-3a 30Gi RWO standard 5m4s
hello-web-disk-statefulset-demo-1 Bound pvc-42 30Gi RWO standard 4m50s
hello-web-disk-statefulset-demo-2 Bound pvc-4c 30Gi RWO standard 4m36s
```
### 스테이트풀 pvc 확인
$`kubectl describe pvc hello-web-disk-statefulset-demo-0`
# 4. Verify the persistence of Persistent Volume connections to Pods managed by StatefulSets
## statefulset-demo-0 쉘 접속
$`kubectl exec -it statefulset-demo-0 -- sh`
```
# echo Test webpage in a persistent volume!>/var/www/html/index.html
chmod +x /var/www/html/index.html#
#
# cat /var/www/html/index.html
Test webpage in a persistent volume!
#
# exit
```
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