CSDN 為我的同步更新部落格，部落格原地址：airheaven.cn

Ceph作為塊儲存，有時候需要將其掛載到本地作為檔案系統使用，如果我們有這樣的需求，那麼我們應該如何操作呢？

1.在ceph叢集中建立image，作為磁碟檔案

[email protected]:~# rbd create test-image --size 256 --pool test-pool
[email protected]:~# rbd ls test-pool
test-image
[email protected]:/test# rbd --image test-image info --pool test-pool
rbd image 'test-image':
    size 2048 MB in 512 objects
    order 22 (4096 kB objects)
    block_name_prefix: rb.0.1023.6b8b4567
    format: 1

刪除image指令（雖然這裡並不需要）

[email protected]:~# rbd rm test-image -p test-pool
Removing image: 100% complete...done.

2.Kernel Modules && Map rbd to device

有時候我們需要將image掛載到本地,同時修改image中的一些資訊,這就需要用到了map操作.
首先我們需要在核心中載入rbd模組

[email protected]:~# modprobe rbd
[email protected]:~# rbd create test-image --size 1024 --pool test-pool
 
[email protected]:~# rbd map test-image --pool test-pool --id admin 
[email protected]:~# rbd showmapped 
id pool      image      snap device    
0  test-pool test-image -    /dev/rbd0

格式化/dev/rbd0 然後將其掛載到 /test

[email protected]:/dev/rbd# mkfs.ext4 /dev/rbd0 
mke2fs 1.42.9 (4-Feb-2014)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=1024 blocks, Stripe width=1024 blocks
65536 inodes, 262144 blocks
13107 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=268435456
8 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks: 
	32768, 98304, 163840, 229376

Allocating group tables: done                            
Writing inode tables: done                            
Creating journal (8192 blocks): done
Writing superblocks and filesystem accounting information: done

 
[email protected]:/dev/rbd# mkdir /test
[email protected]:/dev/rbd# mount /dev/rbd0 /test
[email protected]:/dev/rbd# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/sda1        14G  3.9G  9.2G  30% /
none            4.0K     0  4.0K   0% /sys/fs/cgroup
udev            480M  4.0K  480M   1% /dev
tmpfs            98M  1.5M   97M   2% /run
none            5.0M     0  5.0M   0% /run/lock
none            490M  152K  490M   1% /run/shm
none            100M   44K  100M   1% /run/user
/dev/rbd0       976M  1.3M  908M   1% /test

進入/test 建立檔案

[email protected]:/dev/rbd# cd /test
[email protected]:/test# echo "hello world" > hello.txt
[email protected]:/test# ls
hello.txt  lost+found

後續將針對該裝置進行效能測試。