持續整合系列(6)------分散式儲存ceph部署
阿新 • • 發佈:2018-12-18
持續整合系列(6)------k8s結合ceph實現動態申請pv
目標
預設情況下,pod使用的儲存需要先手動建立pv,再通過pvc申請已建立的pv,步驟繁瑣;利用kubernetes的新特性allows storage volumes to be created on-demand就不用每次都手動建立PV了。通過配置StorageClass為ceph實現動態分配
建立rbd-provisioner
cat >external-storage-rbd-provisioner.yaml<<EOF apiVersion: v1 kind: ServiceAccount metadata: name: rbd-provisioner namespace: kube-system --- kind: ClusterRole apiVersion: rbac.authorization.k8s.io/v1 metadata: name: rbd-provisioner rules: - apiGroups: [""] resources: ["persistentvolumes"] verbs: ["get", "list", "watch", "create", "delete"] - apiGroups: [""] resources: ["persistentvolumeclaims"] verbs: ["get", "list", "watch", "update"] - apiGroups: ["storage.k8s.io"] resources: ["storageclasses"] verbs: ["get", "list", "watch"] - apiGroups: [""] resources: ["events"] verbs: ["create", "update", "patch"] - apiGroups: [""] resources: ["endpoints"] verbs: ["get", "list", "watch", "create", "update", "patch"] - apiGroups: [""] resources: ["services"] resourceNames: ["kube-dns"] verbs: ["list", "get"] --- kind: ClusterRoleBinding apiVersion: rbac.authorization.k8s.io/v1 metadata: name: rbd-provisioner subjects: - kind: ServiceAccount name: rbd-provisioner namespace: kube-system roleRef: kind: ClusterRole name: rbd-provisioner apiGroup: rbac.authorization.k8s.io --- apiVersion: rbac.authorization.k8s.io/v1 kind: Role metadata: name: rbd-provisioner namespace: kube-system rules: - apiGroups: [""] resources: ["secrets"] verbs: ["get"] --- apiVersion: rbac.authorization.k8s.io/v1 kind: RoleBinding metadata: name: rbd-provisioner namespace: kube-system roleRef: apiGroup: rbac.authorization.k8s.io kind: Role name: rbd-provisioner subjects: - kind: ServiceAccount name: rbd-provisioner namespace: kube-system --- apiVersion: extensions/v1beta1 kind: Deployment metadata: name: rbd-provisioner namespace: kube-system spec: replicas: 1 strategy: type: Recreate template: metadata: labels: app: rbd-provisioner spec: containers: - name: rbd-provisioner image: "quay.io/external_storage/rbd-provisioner:v2.0.0-k8s1.11" env: - name: PROVISIONER_NAME value: ceph.com/rbd serviceAccount: rbd-provisioner EOF kubectl apply -f external-storage-rbd-provisioner.yaml # 檢視狀態 等待running之後 再進行後續的操作 kubectl get pod -n kube-system
配置storageclass
# 在k8s叢集中所有節點安裝 ceph-common yum install -y ceph-common # 建立 osd pool 在ceph的mon或者admin節點 ceph osd pool create kube 4096 ceph osd pool ls # 建立k8s訪問ceph的使用者 在ceph的mon或者admin節點 ceph auth get-or-create client.kube mon 'allow r' osd 'allow class-read object_prefix rbd_children, allow rwx pool=kube' -o ceph.client.kube.keyring # 檢視key 在ceph的mon或者admin節點 ceph auth get-key client.admin ceph auth get-key client.kube # 建立 admin secret # CEPH_ADMIN_SECRET 替換為 client.admin 獲取到的key export CEPH_ADMIN_SECRET='AQBBAnRbSiSOFxAAEZXNMzYV6hsceccYLhzdWw==' kubectl create secret generic ceph-secret --type="kubernetes.io/rbd" \ --from-literal=key=$CEPH_ADMIN_SECRET \ --namespace=kube-system # 在 default 名稱空間建立pvc用於訪問ceph的 secret # CEPH_KUBE_SECRET 替換為 client.kube 獲取到的key export CEPH_KUBE_SECRET='AQBZK3VbTN/QOBAAIYi6CRLQcVevW5HM8lunOg==' kubectl create secret generic ceph-user-secret --type="kubernetes.io/rbd" \ --from-literal=key=$CEPH_KUBE_SECRET \ --namespace=default # 檢視 secret kubectl get secret ceph-user-secret -o yaml kubectl get secret ceph-secret -n kube-system -o yaml # 配置 StorageClass # 如果使用kubeadm建立的叢集 provisioner 使用如下方式 # provisioner: ceph.com/rbd cat >storageclass-ceph-rdb.yaml<<EOF kind: StorageClass apiVersion: storage.k8s.io/v1 metadata: name: dynamic-ceph-rdb provisioner: ceph.com/rbd # provisioner: kubernetes.io/rbd parameters: monitors: 10.79.167.29:6789,10.79.167.30:6789,10.79.167.31:6789 adminId: admin adminSecretName: ceph-secret adminSecretNamespace: kube-system pool: kube userId: kube userSecretName: ceph-user-secret fsType: ext4 imageFormat: "2" imageFeatures: "layering" EOF # 建立 kubectl apply -f storageclass-ceph-rdb.yaml # 檢視 kubectl get sc
使用測試
# 建立pvc測試 cat >ceph-rdb-pvc-test.yaml<<EOF kind: PersistentVolumeClaim apiVersion: v1 metadata: name: ceph-rdb-claim spec: accessModes: - ReadWriteOnce storageClassName: dynamic-ceph-rdb resources: requests: storage: 2Gi EOF kubectl apply -f ceph-rdb-pvc-test.yaml # 檢視 kubectl get pvc kubectl get pv # 建立 nginx pod 掛載測試 cat >nginx-pod.yaml<<EOF apiVersion: v1 kind: Pod metadata: name: nginx-pod1 labels: name: nginx-pod1 spec: containers: - name: nginx-pod1 image: nginx:alpine ports: - name: web containerPort: 80 volumeMounts: - name: ceph-rdb mountPath: /usr/share/nginx/html volumes: - name: ceph-rdb persistentVolumeClaim: claimName: ceph-rdb-claim EOF kubectl apply -f nginx-pod.yaml # 檢視 kubectl get pods -o wide # 修改檔案內容 kubectl exec -ti nginx-pod1 -- /bin/sh -c 'echo Hello World from Ceph RBD!!! > /usr/share/nginx/html/index.html' # 訪問測試 POD_ID=$(kubectl get pods -o wide | grep nginx-pod1 | awk '{print $(NF-1)}') curl http://$POD_ID # 清理 kubectl delete -f nginx-pod.yaml kubectl delete -f ceph-rdb-pvc-test.yaml