실습

사전 작업

Ingress-NGINX 컨트롤러 설치
ExternalDNS 설치

Ceph 클러스터 구성

Node에 부여된 Label을 통해서 EKS 클러스터 이름 확인하고 환경변수로 저장

{
    export CLUSTER_NAME=$(kubectl get node \
    -o=jsonpath='{.items[0].metadata.labels.alpha\.eksctl\.io\/cluster-name}')
    echo $CLUSTER_NAME
}

Ceph 클러스터에 사용할 노드그룹에 생성

{
    cat <<EOF > ceph-node.yaml
apiVersion: eksctl.io/v1alpha5
kind: ClusterConfig

metadata:
  name: $CLUSTER_NAME
  region: ap-northeast-2

managedNodeGroups:
- name: ceph-node
  instanceType: c5.2xlarge
  desiredCapacity: 3
  volumeSize: 20
  labels:
    role: ceph
  additionalVolumes:
  - volumeName: /dev/sdf
    volumeSize: 20
    volumeType: gp3
EOF
    eksctl create nodegroup --config-file=ceph-node.yaml
}

생성된 노드 확인
```
kubectl get node -l role=ceph
```
Namespace 생성
```
kubectl create ns rook-ceph
```

Helm 차트 리포지토리 추가

{
    helm repo add rook-release https://charts.rook.io/release
    helm repo update
}

Ceph Operator 차트에 지정할 변수를 명시한 파일 생성 - https://rook.io/docs/rook/v1.12/Helm-Charts/operator-chart/#configuration

cat <<EOF > rook-ceph.yaml
nodeSelector:
  role: ceph
csi:
  provisionerNodeAffinity: role=ceph
admissionController:
  nodeAffinity: role=ceph
priorityClassName: system-cluster-critical
EOF

Ceph Operator 설치

helm install rook-ceph rook-release/rook-ceph -n rook-ceph -f rook-ceph.yaml

Ceph Operator 상태 확인

kubectl -n rook-ceph get pod -l app=rook-ceph-operator

Ceph Operator 로그 확인

kubectl -n rook-ceph logs deploy/rook-ceph-operator

Ceph Cluster 차트에 지정할 변수를 명시한 파일 생성 - https://rook.io/docs/rook/v1.12/Helm-Charts/ceph-cluster-chart/#configuration

cat <<EOF > rook-ceph-cluster.yaml
cephClusterSpec:
  cephVersion:
    image: quay.io/ceph/ceph:v17.2.5
  storage:
    useAllNodes: false
    useAllDevices: false
    nodes:
    - name: NODE_NAME
      devices:
      - name: DEVICE_NAME
    - name: NODE_NAME
      devices:
      - name: DEVICE_NAME
    - name: NODE_NAME
      devices:
      - name: DEVICE_NAME
  placement:
    all:
      nodeAffinity:
        requiredDuringSchedulingIgnoredDuringExecution:
          nodeSelectorTerms:
            - matchExpressions:
              - key: role
                operator: In
                values:
                - ceph
  crashCollector:
    disable: true
  dashboard:
    enabled: true
    ssl: false
cephFileSystems:
- name: ceph-filesystem
  spec:
    metadataPool:
      replicated:
        size: 3
    dataPools:
    - failureDomain: host
      replicated:
        size: 3
      name: data0
    metadataServer:
      activeCount: 1
      activeStandby: true
      resources:
        limits:
          cpu: "2000m"
          memory: "4Gi"
        requests:
          cpu: "1000m"
          memory: "4Gi"
      priorityClassName: system-cluster-critical
      placement:
        nodeAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            nodeSelectorTerms:
            - matchExpressions:
              - key: role
                operator: In
                values:
                - ceph
  storageClass:
    enabled: true
    isDefault: false
    name: ceph-filesystem
    pool: data0
    reclaimPolicy: Delete
    allowVolumeExpansion: true
    volumeBindingMode: "Immediate"
    mountOptions: []
    parameters:
      csi.storage.k8s.io/provisioner-secret-name: rook-csi-cephfs-provisioner
      csi.storage.k8s.io/provisioner-secret-namespace: "{{ .Release.Namespace }}"
      csi.storage.k8s.io/controller-expand-secret-name: rook-csi-cephfs-provisioner
      csi.storage.k8s.io/controller-expand-secret-namespace: "{{ .Release.Namespace }}"
      csi.storage.k8s.io/node-stage-secret-name: rook-csi-cephfs-node
      csi.storage.k8s.io/node-stage-secret-namespace: "{{ .Release.Namespace }}"
      csi.storage.k8s.io/fstype: ext4
cephObjectStores:
- name: ceph-objectstore
  spec:
    metadataPool:
      failureDomain: host
      replicated:
        size: 3
    dataPool:
      failureDomain: host
      erasureCoded:
        dataChunks: 2
        codingChunks: 1
    preservePoolsOnDelete: true
    gateway:
      port: 80
      resources:
        limits:
          cpu: "2000m"
          memory: "2Gi"
        requests:
          cpu: "1000m"
          memory: "1Gi"
      instances: 1
      priorityClassName: system-cluster-critical
      placement:
        nodeAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            nodeSelectorTerms:
            - matchExpressions:
              - key: role
                operator: In
                values:
                - ceph
  storageClass:
    enabled: true
    name: ceph-bucket
    reclaimPolicy: Delete
    volumeBindingMode: "Immediate"
    parameters:
      region: ap-northeast-2
ingress:
  dashboard:
    ingressClassName: nginx
    host:
      name: HOST_NAME
toolbox:
  enabled: true
  affinity:
    nodeAffinity:
      requiredDuringSchedulingIgnoredDuringExecution:
        nodeSelectorTerms:
          - matchExpressions:
            - key: role
              operator: In
              values:
              - ceph
monitoring:
  enabled: false
  createPrometheusRules: false
EOF

위에서 생성한 파일을 열고 NODE_NAME, DEV_NAME, HOST_NAME을 변경

Ceph Cluster 설치

helm install rook-ceph-cluster rook-release/rook-ceph-cluster -n rook-ceph -f rook-ceph-cluster.yaml

생성된 CRD 확인
```
kubectl get crd
```

CephCluster 객체 확인

kubectl get cephclusters.ceph.rook.io rook-ceph -n rook-ceph

Ceph Operator 로그 확인

kubectl -n rook-ceph logs deploy/rook-ceph-operator -f

생성된 Pod 목록 확인
```
kubectl get pod -n rook-ceph
```

Ceph Operator 로그 확인

kubectl -n rook-ceph logs deploy/rook-ceph-operator -f

Ceph Cluster 대시보드에 연동된 Ingress 객체 확인
```
kubectl get ing -n rook-ceph
```

대시보드 로그인에 필요한 비밀번호 확인

kubectl -n rook-ceph get secret rook-ceph-dashboard-password \
-o jsonpath={.data.password} | base64 -d && echo

웹브라우저를 열고 대시보드로 연결 후 로그인
클러스터 상태가 정상인지 확인
StorageClass가 생성되었는지 확인
```
kubectl get sc
```

볼륨 프로비저닝

생성된 PVC가 있는지 확인
```
kubectl get pvc
```

PVC 생성

cat <<EOF | kubectl apply -f -
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: nginx-data
spec:
  storageClassName: ceph-block
  accessModes:
  - ReadWriteOnce
  resources:
     requests:
       storage: 1Gi
EOF

PVC가 생성되었는지 확인
```
kubectl get pvc nginx-data
```
PVC에 발생한 이벤트 확인
```
kubectl describe pvc nginx-data
```
PV가 생성되었는지 확인
```
kubectl get pv
```
생성된 PV의 상세 내용 확인
```
kubectl get pv -o yaml
```
Ceph Cluster 대시보드로 이동해서 새로운 Block 스토리지가 생성되었는지 확인

Deployment 생성

cat <<EOF | kubectl apply -f -
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    run: nginx
  name: nginx
spec:
  selector:
    matchLabels:
      run: nginx
  template:
    metadata:
      labels:
        run: nginx
    spec:
      containers:
      - image: nginx
        imagePullPolicy: Always
        name: nginx
        volumeMounts:
        - name: data
          mountPath: /data
        ports:
        - containerPort: 80
          protocol: TCP
      volumes:
      - name: data
        persistentVolumeClaim:
          claimName: nginx-data
EOF

생성된 Pod 확인
```
kubectl get pod -l run=nginx
```

PV를 마운트한 경로에 파일 생성

kubectl exec -it deploy/nginx -- bash -c "echo hello > /data/world.txt"

파일이 정상적으로 생성되었는지 확인
```
kubectl exec -it deploy/nginx -- cat /data/world.txt
```

PVC 수정

cat <<EOF | kubectl apply -f -
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: nginx-data
spec:
  storageClassName: ceph-block
  accessModes:
  - ReadWriteOnce
  resources:
     requests:
       storage: 2Gi
EOF

PVC가 수정되었는지 확인
```
kubectl get pvc nginx-data
```
PVC에 발생한 이벤트 확인
```
kubectl describe pvc nginx-data
```
PV가 수정되었는지 확인
```
kubectl get pv
```
Ceph Cluster 대시보드로 이동해서 생성된 Block 스토리지에 변경 사항이 있는지 확인
Deployment의 복제본 갯수를 2개로 수정
```
kubectl scale deploy nginx --replicas=2
```
Pod가 생성되었는지 확인
```
kubectl get pod -l run=nginx
```

새로운 Pod가 실행되지 않는 이유 확인

kubectl describe pod \
$(kubectl get pod -l run=nginx --sort-by='.metadata.creationTimestamp' -o=jsonpath='{.items[-1].metadata.name}')

PVC 삭제
```
kubectl delete pvc nginx-data
```
위의 명령어가 종료되지 않을 경우에는 Ctrl+C를 입력
PVC 상태 확인
```
kubectl get pvc nginx-data
```
PVC가 삭제되지 않는 이유 확인
```
kubectl get pvc nginx-data -o yaml
```
PV 상태 확인
```
kubectl get pv
```
Deployment 삭제
```
kubectl delete deploy nginx
```
PVC가 삭제되었는지 확인
```
kubectl get pvc nginx-data
```
PV가 삭제되었는지 확인
```
kubectl get pv
```

PVC 생성

cat <<EOF | kubectl apply -f -
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: nginx-data
spec:
  storageClassName: ceph-filesystem
  accessModes:
  - ReadWriteMany
  resources:
     requests:
       storage: 1Gi
EOF

PVC가 생성되었는지 확인
```
kubectl get pvc nginx-data
```
PVC에 발생한 이벤트 확인
```
kubectl describe pvc nginx-data
```
PV가 생성되었는지 확인
```
kubectl get pv
```
생성된 PV의 상세 내용 확인
```
kubectl get pv -o yaml
```
Ceph Cluster 대시보드로 이동해서 새로운 Filesystem이 생성되었는지 확인

Deployment 생성

cat <<EOF | kubectl apply -f -
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    run: nginx
  name: nginx
spec:
  selector:
    matchLabels:
      run: nginx
  template:
    metadata:
      labels:
        run: nginx
    spec:
      containers:
      - image: nginx
        imagePullPolicy: Always
        name: nginx
        volumeMounts:
        - name: data
          mountPath: /data
        ports:
        - containerPort: 80
          protocol: TCP
      volumes:
      - name: data
        persistentVolumeClaim:
          claimName: nginx-data
EOF

생성된 Pod 확인
```
kubectl get pod -l run=nginx
```

PV를 마운트한 경로에 파일 생성

kubectl exec -it deploy/nginx -- bash -c "echo hello > /data/world.txt"

파일이 정상적으로 생성되었는지 확인
```
kubectl exec -it deploy/nginx -- cat /data/world.txt
```
Deployment의 복제본 갯수를 2개로 수정
```
kubectl scale deploy nginx --replicas=2
```
Pod가 생성되었는지 확인
```
kubectl get pod -l run=nginx
```

새로 생성된 Pod에서 다른 Pod에서 생성한 파일이 보이는지 확인

kubectl exec -it $(kubectl get pod -l run=nginx --sort-by='.metadata.creationTimestamp' -o=jsonpath='{.items[-1].metadata.name}') \
-- cat /data/world.txt

리소스 삭제

{
    kubectl delete deploy nginx
    kubectl delete pvc nginx-data
}

PV 목록 확인
```
kubectl get pv
```

Cleanup

Ceph Cluster 삭제

helm uninstall rook-ceph-cluster -n rook-ceph

Ceph Operator 로그 확인

kubectl -n rook-ceph logs deploy/rook-ceph-operator -f

Pod 목록 확인
```
kubectl get pod -n rook-ceph
```
Ceph Operator 삭제
```
helm uninstall rook-ceph -n rook-ceph
```
Pod 목록 확인
```
kubectl get pod -n rook-ceph
```
Namespace 삭제
```
kubectl delete ns rook-ceph
```

노드그룹 삭제

eksctl delete nodegroup --config-file=ceph-node.yaml --approve

노드 목록 확인
```
kubectl get node
```

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