ceph 创建使用 rbd

> 本文由 [简悦 SimpRead](http://ksria.com/simpread/) 转码， 原文地址 [www.cnblogs.com](https://www.cnblogs.com/klvchen/p/14749035.html)

```
# 查看 osd 池
ceph osd lspools
 # 创建 pool 池, pool osd pool create <pool> [<pg_num:int>] [<pgp_num:int>]
ceph osd pool create ceph-demo 64 64
 # 初始化这个pool 为 RBD （不加时默认为rbd）
rbd pool init ceph-demo

ceph osd lspools
 # 查看 pool pg 数量
ceph osd pool get ceph-demo pg_num
 # 查看 pool pgp 数量
ceph osd pool get ceph-demo pgp_num
 # 查看 pool 的副本数
ceph osd pool get ceph-demo size
 # 查看 pool 的存储规则
ceph osd pool get ceph-demo crush_rule
 # 调整 pool pg 数量
ceph osd pool set ceph-demo pg_num 128
 # 查看 ceph 集群状态
ceph -s
 # 创建块设备镜像
rbd create -p ceph-demo --image rbd-demo.img --size 5G
rbd create ceph-demo/rbd-demo-1.img --size 5G
 # 查看 ceph-demo 池中的块设备
rbd -p ceph-demo ls
 # 查看镜像信息
rbd info ceph-demo/rbd-demo.img
rbd -p ceph-demo info rbd-demo.img
 # 映射块设备
rbd map ceph-demo/rbd-demo.img

dmesg |tail
rbd -p ceph-demo info rbd-demo.img
 # 因为操作系统内核无法支持某些特性，所以禁用掉
rbd feature disable ceph-demo/rbd-demo.img deep-flatten
rbd feature disable ceph-demo/rbd-demo.img fast-diff
rbd feature disable ceph-demo/rbd-demo.img exclusive-lock
rbd map ceph-demo/rbd-demo.img
 # 查看映射的块存储
rbd device list
 # 格式化块设备进行挂载
mkfs.xfs /dev/rbd0 
mkdir /mnt/rbd-demo
mount /dev/rbd0 /mnt/rbd-demo/
 # 测试写入数据
cd /mnt/rbd-demo/
echo test > test.txt
 # 对镜像进行扩容
rbd resize ceph-demo/rbd-demo.img --size 6G
rbd -p ceph-demo info --image rbd-demo.img

xfs_growfs /dev/rbd0 
 # 查看镜像信息
rbd -p ceph-demo info rbd-demo.img
 # 列出 ceph-demo 资源池对象
rados -p ceph-demo ls 
rados -p ceph-demo ls |grep  rbd_data.85e3642a0138
 # 统计这个对象
rados -p ceph-demo stat rbd_data.85e3642a0138.000000000000031b
 # 查看osd物理存储位置
ceph osd map ceph-demo rbd_data.85e3642a0138.000000000000031b
 # 把 OSD 运行图转储为树，每个 OSD 一行、包含权重和状态。
ceph osd tree
for i in `rados -p ceph-demo ls |grep rbd_data.85e3642a0138`; do ceph osd map ceph-demo ${i};done
 # 显示集群健康状况
ceph health detail
 # 查看池的应用类型
ceph osd pool application get ceph-demo
 # 列出所有的crash 的时间戳和id，并存档crash 信息
ceph crash ls
 # 为池关联应用类型，显式指定能够使用它的ceph应用类型：ceph块设备，ceph对象网关，ceph文件系统
ceph osd pool application enable ceph-demo rbd

systemctl status ceph-mgr@node-1
systemctl status ceph-mgr@node-2
systemctl status ceph-mgr@node-3
```

参考：[http://docs.ceph.org.cn/](http://docs.ceph.org.cn/)