官方文件地址：https://rook.io/docs/rook/v1.8/ceph-teardown.html

如果要拆除群集並啟動新群集，請注意需要清理的以下資源：

• rook-ceph namespace: The Rook operator and cluster created by operator.yaml and cluster.yaml (the cluster CRD)
• /var/lib/rook: Path on each host in the cluster where configuration is cached by the ceph mons and osds # 每一個主機的該目錄需要刪除

刪除現有的資源

kubectl delete -n rook-ceph cephblockpool replicapool
kubectl delete storageclass rook-ceph-block
kubectl delete storageclass csi-cephfs

kubectl -n rook-ceph delete cephcluster rook-ceph

kubectl delete -f operator.yaml
kubectl delete -f common.yaml
kubectl delete -f crds.yaml

刪除每個主機中的/var/lib/rook目錄（預設是這個目錄）

刪除磁碟資料

# yum -y install gdisk

#!/usr/bin/env bash
DISK="/dev/sdb" # 修改具體的磁碟

# Zap the disk to a fresh, usable state (zap-all is important, b/c MBR has to be clean)

# You will have to run this step for all disks.
sgdisk --zap-all $DISK

# Clean hdds with dd # 機械磁碟使用這個命令清除磁碟資料
dd if=/dev/zero of="$DISK" bs=1M count=100 oflag=direct,dsync

# Clean disks such as ssd with blkdiscard instead of dd # 固態磁碟使用這個命令清除磁碟資料，若不是固態磁碟則會提示不支援這一步操作
blkdiscard $DISK

# These steps only have to be run once on each node
# If rook sets up osds using ceph-volume, teardown leaves some devices mapped that lock the disks.
ls /dev/mapper/ceph-* | xargs -I% -- dmsetup remove %

# ceph-volume setup can leave ceph-<UUID> directories in /dev and /dev/mapper (unnecessary clutter)
rm -rf /dev/ceph-*
rm -rf /dev/mapper/ceph--*

# Inform the OS of partition table changes
partprobe $DISK