怎样配置cephrbd存储类型？

kubeadm k8s配置 ceph rbd存储 类型storageClass

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k8s的storageclass,实现pvc的动态创建,绑定

首先安装ceph参考https://blog.csdn.net/qq_42006894/article/details/88424199

1、部署rbd-provisioner
git clone https://github.com/kubernetes-incubator/external-storage.git
cd external-storage/ceph/rbd/deploy
NAMESPACE=ceph
sed -r -i "s/namespace: [^ ]+/namespace: $NAMESPACE/g" ./rbac/clusterrolebinding.yaml ./rbac/rolebinding.yaml
kubectl -n $NAMESPACE apply -f ./rbac

2、创建secret 和 pool

###创建admin secret
ceph auth get client.admin 2>&1 |grep "key = " |awk '{print  $3'} |xargs echo -n > /tmp/key
kubectl create secret generic ceph-admin-secret --from-file=/tmp/key --namespace=ceph --type=kubernetes.io/rbd
###创建ceph osd pool
ceph osd pool create kube 128 128
ceph auth add client.kube mon 'allow r' osd 'allow rwx pool=kube'
###创建 用户secret
ceph auth get-key client.kube > /tmp/key1
kubectl create secret generic ceph-secret --from-file=/tmp/key1 --namespace=ceph  --type=kubernetes.io/rbd

3、创建storageclass

cat ceph-sc-ceph.yml
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
name: ceph-rbd-ceph
namespace: ceph
annotations:
storageclass.kubernetes.io/is-default-class: "true"
provisioner: ceph.com/rbd
parameters:
monitors: 172.16.13.198:6789,172.16.13.199:6789,172.16.13.200:6789
adminId: admin
adminSecretName: ceph-admin-secret
adminSecretNamespace: ceph
pool: kubernetes
userId: kubernetes
userSecretName: ceph-secret
userSecretNamespace: ceph
fsType: ext4
imageFormat: "2"
imageFeatures: "layering"

4、配置rdb-provisioner的rbac权限控制
cd external-storage/ceph/rbd/deploy
修改里面的默认命名空间就即可

cat clusterrolebinding.yaml
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
name: rbd-provisioner1
subjects:

• kind: ServiceAccount
  name: rbd-provisioner1

roleRef:
kind: ClusterRole
name: rbd-provisioner1
apiGroup: rbac.authorization.k8s.io

cat clusterrole.yaml
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
name: rbd-provisioner1
namespace: ceph
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: ["services"]
  resourceNames: ["kube-DNS","coredns"]
  verbs: ["list", "get"]

• apiGroups: [""]
  resources: ["endpoints"]
  verbs: ["get", "list", "watch", "create", "update", "patch"]

  cat deployment.yaml
  apiVersion: extensions/v1beta1
  kind: Deployment
  metadata:
  name: rbd-provisioner1
  namespace: ceph
  spec:
  replicas: 1
  strategy:
  type: Recreate
  template:
  metadata:
  labels:
  app: rbd-provisioner1
  spec:
  containers:

  • name: rbd-provisioner1
    image: "quay.io/external_storage/rbd-provisioner:latest"
    env:
    • name: PROVISIONER_NAME
      value: ceph.com/rbd
      serviceAccount: rbd-provisioner1

cat rolebinding.yaml
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
name: rbd-provisioner1
namespace: ceph
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: Role
name: rbd-provisioner1
subjects:

• kind: ServiceAccount
  name: rbd-provisioner1
  namespace: ceph

cat role.yaml
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
name: rbd-provisioner1
namespace: ceph
rules:

• apiGroups: [""]
  resources: ["secrets"]
  verbs: ["get"]
• apiGroups: [""]
  resources: ["endpoints"]
  verbs: ["get", "list", "watch", "create", "update", "patch"]

cat serviceaccount.yaml
apiVersion: v1
kind: ServiceAccount
metadata:
name: rbd-provisioner1
namespace: ceph

kubectl apply -f .

5、创建pvc
cat ceph-pv-ceph.yml
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: test-claim-ceph
namespace: ceph
spec:
accessModes:

• ReadWriteOnce
  storageClassName: ceph-rbd-ceph
  resources:
  requests:
  storage: 10Gi

kubectl apply -f ceph-pv-ceph.yml
查看，如果是bound 状态说明成功
#kubectl get pvc
NAME     STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS   AGE
claim1   Bound    pvc-ff3e450b-4629-11e9-9740-080027a073ff   1Gi        RWO            rbd            51m

如果出错，定位错误方法
kubectl describe pvc/claim1  
kubectl get pods -o wide
NAME                               READY   STATUS    RESTARTS   AGE     IP            NODE     NOMINATED NODE   READINESS GATES
MySQL-wayne-8744474d7-kz29c        1/1     Running   0          5d19h   10.244.6.85   node2              
rbd-provisioner-67b4857bcd-8vsb8   1/1     Running   0          63m     10.244.3.7    node04            
#查看到 rbd-provisioner 在 node04   上，然后再node04上查看容器log
docker logs -f 6ed00b76cb55         # 6ed00b76cb55   是容器的id （docker ps 查看）

6,遇到的坑
error retrieving resource lock default/ceph.com-rbd: endpoints “ceph.com-rbd” is forbidden: User “system:serviceaccount:default:rbd-provisioner” cannot get endpoints in the namespace “default”
在 rbd-provisioner.yaml 中 clusterrole最后添加

• apiGroups: [""]
  resources: ["endpoints"]
  verbs: ["get", "list", "watch", "create", "update", "patch"]

其他参考https://blog.csdn.net/qq_34857250/article/details/82562514

7、
参考：https://github.com/kubernetes-incubator/external-storage/tree/master/ceph/rbd

PS设置默认storageclass：
kubectl patch storageclass ceph-rbd -p '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"true"}}}'

错误提示:
MountVolume.WaitForAttach failed for volume "pvc-23555713-da9e-11e9-931b-000c29158017" : fail to check rbd image status with: (executable file not found in $PATH), rbd output: ()
解决办法
在K8s各个节点执行
yum install -y ceph-common

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