本课程将详细介绍k8s所有命令，以及命令的go源码分析，学习知其然，知其所以然
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1storageclass 设置allowVolumeExpansion: true
如：
apiVersion: storage.k8s.io/v1 kind: StorageClass
metadata:
name: rook-block
provisioner: rook.io/block allowVolumeExpansion: true
parameters:
pool: replicapool
# Specify the namespace of the rook cluster from which to create volumes.
# If not specified, it will use `rook` as the default namespace of the cluster.
# This is also the namespace where the cluster will be
clusterNamespace: rook
# Specify the filesystem type of the volume. If not specified, it will use `ext4`.
# fstype: ext4
2编辑pvc增大容量
3扩展rdb
用rdb resize命令
如：
rbd resize --size 9192 pvc-6a06fa0f-c0a5-401b-83bf-d44c1dd20d80
扩展好后查看：
rbd info --pool replicapool2 pvc-6a06fa0f-c0a5-401b-83bf-d44c1dd20d80
4进入pod所在的主机
执行：resize2fs
如: resize2fs /dev/rbd1
5进入pod，查看是否容量扩大
