rbd块映射：
root@u18:~# rbd create kvm/test002.img --size
root@u18:~# rbd info kvm/test002.img
rbd image 'test002.img':
size kB in objects
order ( kB objects)
block_name_prefix: rb..2f13.2ae8944a
format:
root@u18:~# rbd map kvm/test002.img
root@u18:~# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda : .1G disk
├─sda1 : .2G part /
├─sda2 : 1K part
└─sda5 : .9G part [SWAP]
sdb : .8G disk
├─sdb1 : 200G part /ceph_node0
├─sdb2 : 1K part
├─sdb5 : 100G part
└─sdb6 : .8G part /data2
rbd0 : 40G disk
rbd1 : 20M disk
zram0 : 936.4M disk [SWAP] root@u18:~# mkfs.ext4 /dev/rbd1
mke2fs 1.42 (-Nov-)
Filesystem label=
OS type: Linux
Block size= (log=)
Fragment size= (log=)
Stride= blocks, Stripe width= blocks
inodes, blocks
blocks (5.00%) reserved for the super user
First data block=
Maximum filesystem blocks=
block groups
blocks per group, fragments per group
inodes per group
Superblock backups stored on blocks: Allocating group tables: done
Writing inode tables: done
Creating journal ( blocks): done
Writing superblocks and filesystem accounting information: done root@u18:~# mount /dev/rbd1 /mnt
root@u18:~# echo test > /mnt/a.log
root@u18:~# vim a.log
root@u18:~# vim /mnt/a.log
root@u18:~# umount /mnt
root@u18:~# rbd unmap /dev/rbd1
root@u18:~# rbd resize --size kvm/test002.img
Resizing image: % complete...done.
root@u18:~# rbd info kvm/test002.img
rbd image 'test002.img':
size MB in objects
order ( kB objects)
block_name_prefix: rb..2f13.2ae8944a
format:
root@u18:~# rbd info kvm/test002.img
rbd image 'test002.img':
size MB in objects
order ( kB objects)
block_name_prefix: rb..2f13.2ae8944a
format:
root@u18:~# rbd map kvm/test002.img
root@u18:~# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda : .1G disk
├─sda1 : .2G part /
├─sda2 : 1K part
└─sda5 : .9G part [SWAP]
sdb : .8G disk
├─sdb1 : 200G part /ceph_node0
├─sdb2 : 1K part
├─sdb5 : 100G part
└─sdb6 : .8G part /data2
rbd0 : 40G disk
rbd1 : 40G disk
zram0 : 936.4M disk [SWAP]
root@u18:~# rbd unmap /dev/rbd1
root@u18:~# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda : .1G disk
├─sda1 : .2G part /
├─sda2 : 1K part
└─sda5 : .9G part [SWAP]
sdb : .8G disk
├─sdb1 : 200G part /ceph_node0
├─sdb2 : 1K part
├─sdb5 : 100G part
└─sdb6 : .8G part /data2
rbd0 : 40G disk
zram0 : 936.4M disk [SWAP]
root@u18:~# rbd map kvm/test002.img
root@u18:~# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda : .1G disk
├─sda1 : .2G part /
├─sda2 : 1K part
└─sda5 : .9G part [SWAP]
sdb : .8G disk
├─sdb1 : 200G part /ceph_node0
├─sdb2 : 1K part
├─sdb5 : 100G part
└─sdb6 : .8G part /data2
rbd0 : 40G disk
rbd1 : 40G disk
zram0 : 936.4M disk [SWAP]
root@u18:~# mount /dev/rbd1 /mnt
root@u18:~# parted /dev/rbd1 print free
root@u18:~# parted /dev/rbd1 print free
Model: Unknown (unknown)
Disk /dev/rbd1: .9GB
Sector size (logical/physical): 512B/512B
Partition Table: loop Number Start End Size File system Flags
.00B .9GB .9GB ext4 root@u18:~# vim /mnt/a.log
root@u18:~# cat /mnt/a.log
test
