Ceph集群块设备使用-创建和使用OSD

Myth丶恋晨 2022-02-05 05:23 338阅读 0赞

创建Ceph块设备

**\[root@node2 ~\]\# rbd create block-device4 --size 5G --image-format 1**

rbd: image format 1 is deprecated

查看块设备信息

**\[root@node2 ~\]\# rbd --image block-device4 info**

rbd image 'block-device4':

size 5120 MB in 1280 objects

order 22 (4096 kB objects)

block\_name\_prefix: rb.0.1435a.238e1f29

format: 1

映射块设备到block-device4

**\[root@node2 ~\]\# rbd map --image block-device4**

/dev/rbd2

查看系统中块设备映射信息

\[root@node2 ~\]\# rbd showmapped

id pool image snap device

0 rbd block-device1 - /dev/rbd0

1 rbd block-device3 - /dev/rbd1

2 rbd block-device4 - /dev/rbd2

要使用这个块设备，需要创建并挂载一个文件系统

**\[root@node2 ~\]\# mkfs.xfs /dev/rbd2**

meta-data=/dev/rbd2 isize=256 agcount=9, agsize=162816 blks

= sectsz=512 attr=2, projid32bit=1

= crc=0 finobt=0

data = bsize=4096 blocks=1310720, imaxpct=25

= sunit=1024 swidth=1024 blks

naming =version 2 bsize=4096 ascii-ci=0 ftype=0

log =internal log bsize=4096 blocks=2560, version=2

= sectsz=512 sunit=8 blks, lazy-count=1

realtime =none extsz=4096 blocks=0, rtextents=0

创建挂载点并挂载

\[root@node2 ~\]\# mkdir /mnt/block-device4

**\[root@node2 ~\]\# mount /dev/rbd2 /mnt/block-device4**

\[root@node2 ~\]\# df -h /mnt/block-device4

Filesystem Size Used Avail Use% Mounted on

/dev/rbd2 5.0G 33M 5.0G 1% /mnt/block-device4

查看挂载情况

\[root@node2 ~\]\# mount | grep rbd

/dev/rbd0 on /mnt/ceph-block-device1 type xfs (rw,relatime,attr2,inode64,sunit=8192,swidth=8192,noquota)

创建测试文件测试块设备

\[root@node2 ~\]\# touch /mnt/block-device4/test

**\[root@node2 ~\]\# dd if=/dev/zero of=/mnt/block-device4/file bs=1M count=100**

100+0 records in

100+0 records out

104857600 bytes (105 MB) copied, 0.18182 s, 577 MB/s

\[root@node2 ~\]\#

查看文件写入信息

\[root@node2 ~\]\# ls /mnt/block-device4

file test

\[root@node2 ~\]\# ll /mnt/block-device4

total 102400

\-rw-r--r-- 1 root root 104857600 Sep 25 22:37 file

\-rw-r--r-- 1 root root 0 Sep 25 22:36 test

\[root@node2 ~\]\# df -h /mnt/block-device4

Filesystem Size Used Avail Use% Mounted on

/dev/rbd2 5.0G 133M 4.9G 3% /mnt/block-device4

设备开机自动挂载

\[root@node2 ~\]\# echo "/dev/rbd2 /mnt/block-device4 xfs defaults,\_netdev0 0" >> /etc/fstab

查看系统中rbd

\[root@node2 ~\]\# rbd ls

block-device4

block-device2

\[root@node2 ~\]\# rbd list

block-device4

block-device2

将刚创建的RBD块设备扩容到10G

**\[root@node2 ~\]\# rbd resize --image block-device4 --size 10G**

Resizing image: 100% complete...done.

**\[root@node2 ~\]\# rbd --image block-device4 info**

rbd image 'block-device4':

size 10240 MB in 2560 objects

order 22 (4096 kB objects)

block\_name\_prefix: rb.0.1435a.238e1f29

format: 1

扩展文件系统空间

**\[root@node2 ~\]\# df -h /mnt/block-device4**

Filesystem Size Used Avail Use% Mounted on

/dev/rbd2 5.0G 133M 4.9G 3% /mnt/block-device4

使用xfs\_growfs命令对文件系统进行扩充

**\[root@node2 ~\]\# xfs\_growfs -d /mnt/block-device4**

meta-data=/dev/rbd2 isize=256 agcount=9, agsize=162816 blks

= sectsz=512 attr=2, projid32bit=1

= crc=0 finobt=0

data = bsize=4096 blocks=1310720, imaxpct=25

= sunit=1024 swidth=1024 blks

naming =version 2 bsize=4096 ascii-ci=0 ftype=0

log =internal bsize=4096 blocks=2560, version=2

= sectsz=512 sunit=8 blks, lazy-count=1

realtime =none extsz=4096 blocks=0, rtextents=0

data blocks changed from 1310720 to 2621440

**\[root@node2 ~\]\# df -h /mnt/block-device4**

Filesystem Size Used Avail Use% Mounted on

/dev/rbd2 10G 133M 9.9G 2% /mnt/block-device4

\[root@node2 ~\]\#

本文转自 OpenStack2015 博客，原文链接： http://blog.51cto.com/andyliu/1856538  如需转载请自行联系原作者

Ceph集群块设备使用-创建和使用OSD

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