kubernetes 接 ceph 當 storage backend
December 30, 2020•379 words
kubernetes 版本：1.13.0
不同版本的設定可能會不一樣，我在201903測試過可以用
未來可能會有些許不同
不過原則應該都一樣
原則：
kubernetes 支援用 rbd 當 storage backend。但是 kube-controller-manager container 未必會包含 rbd 指令。如果 kube-controller-manager container 未包含 rbd 指令，你建立 storage 時就會看到 『failed to create rbd image: executable file not found in $PATH, command output:』的錯誤。這時候，你就要提供新的 container ，讓 kubernetes 可以透過你提供的 container （之後都叫 provider ）來執行 rbd 相關操作。該 provider 放在 kube-system 下。
腳本簡易說明：
一開始建立名為 rbd-provisioner 的 serviceAccount ，之後在建立 secret 用來放 ceph keyring。最後建立 storage class ( 裡面放 ceph 相關資訊 )
https://gist.github.com/kjelly/97ebc4133b1293eff9135eada974d670
完整腳本如下：
---
# kubectl -n kube-system create -f create-kube-ceph-pbrc.yaml
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: ["services"]
resourceNames: ["kube-dns","coredns"]
verbs: ["list", "get"]
- apiGroups: [""]
resources: ["endpoints"]
verbs: ["get", "list", "watch", "create", "update", "patch"]
---
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/v1beta1
kind: Role
metadata:
name: rbd-provisioner
rules:
- apiGroups: [""]
resources: ["secrets"]
verbs: ["get"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
name: rbd-provisioner
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: Role
name: rbd-provisioner
subjects:
- kind: ServiceAccount
name: rbd-provisioner
namespace: kube-system
---
apiVersion: v1
kind: ServiceAccount
metadata:
name: rbd-provisioner
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: rbd-provisioner
spec:
replicas: 1
strategy:
type: Recreate
template:
metadata:
labels:
app: rbd-provisioner
spec:
containers:
- name: rbd-provisioner
image: "quay.io/external_storage/rbd-provisioner:latest"
env:
- name: PROVISIONER_NAME
value: ceph.com/rbd
serviceAccount: rbd-provisioner
---
apiVersion: v1
kind: Secret
metadata:
name: ceph-secret-admin
namespace: kube-system
data:
# change the value
# sudo ceph auth get-key client.admin | base64
key: QVFDYlFubGNVZjVzRkJBQUtKanN1R1FuWUpvNlRweWZQT0E0d3c9PQ==
type: kubernetes.io/rbd
---
apiVersion: v1
kind: Secret
metadata:
name: ceph-secret-user
namespace: kube-system
data:
# change the value
# sudo ceph auth get-key client.admin | base64
key: QVFDYlFubGNVZjVzRkJBQUtKanN1R1FuWUpvNlRweWZQT0E0d3c9PQ==
type: kubernetes.io/rbd
---
kind: StorageClass
apiVersion: storage.k8s.io/v1
metadata:
name: ceph-dynamic
annotations:
storageclass.beta.kubernetes.io/is-default-class: "true"
provisioner: ceph.com/rbd
parameters:
monitors: 10.20.0.5:6789 # change it if needed.
adminId: admin # change it if needed.
adminSecretName: ceph-secret-admin # change it if needed.
adminSecretNamespace: kube-system # change it if needed.
pool: kube # change it if needed.
userId: admin # change it if needed.
userSecretName: ceph-secret-user # change it if needed.
userSecretNamespace: kube-system # change it if needed.
imageFormat: "2"
imageFeatures: "layering"