Rook Cephを用いて、オンプレK8sでダイナミックプロヴィジョニングを実装

https://rook.io/docs/rook/latest/Getting-Started/quickstart/
これでcephrookの構築は出来る

storageclass周りはこれ（ファイルストレージ）
https://rook.io/docs/rook/latest/Storage-Configuration/Shared-Filesystem-CephFS/filesystem-storage/#consume-the-shared-filesystem-across-namespaces

構築

git clone --single-branch --branch master https://github.com/rook/rook.git
cd rook/deploy/examples
kubectl create -f crds.yaml -f common.yaml -f operator.yaml
kubectl create -f cluster.yaml

kubectl -n rook-ceph get pod

Filesystem作成

apiVersion: ceph.rook.io/v1
kind: CephFilesystem
metadata:
  name: myfs
  namespace: rook-ceph
spec:
  metadataPool:
    replicated:
      size: 3
  dataPools:
    - name: replicated
      replicated:
        size: 3
  preserveFilesystemOnDelete: true
  metadataServer:
    activeCount: 1
    activeStandby: true

Storageclassの作成

apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: rook-cephfs
# Change "rook-ceph" provisioner prefix to match the operator namespace if needed
provisioner: rook-ceph.cephfs.csi.ceph.com
parameters:
  # clusterID is the namespace where the rook cluster is running
  # If you change this namespace, also change the namespace below where the secret namespaces are defined
  clusterID: rook-ceph

  # CephFS filesystem name into which the volume shall be created
  fsName: myfs

  # Ceph pool into which the volume shall be created
  # Required for provisionVolume: "true"
  pool: myfs-replicated

  # The secrets contain Ceph admin credentials. These are generated automatically by the operator
  # in the same namespace as the cluster.
  csi.storage.k8s.io/provisioner-secret-name: rook-csi-cephfs-provisioner
  csi.storage.k8s.io/provisioner-secret-namespace: rook-ceph
  csi.storage.k8s.io/controller-expand-secret-name: rook-csi-cephfs-provisioner
  csi.storage.k8s.io/controller-expand-secret-namespace: rook-ceph
  csi.storage.k8s.io/node-stage-secret-name: rook-csi-cephfs-node
  csi.storage.k8s.io/node-stage-secret-namespace: rook-ceph

reclaimPolicy: Delete

PVCの作成

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: cephfs-pvc
  namespace: kube-system
spec:
  accessModes:
  - ReadWriteMany
  resources:
    requests:
      storage: 1Gi
  storageClassName: rook-cephfs