ceph rbd 块命令 块扩容 创建快照 rbd分层 rbd快照克隆 可写快照 rbd 导入导出，池、块、快照命令
1. 块命令基础
# ceph osd pool create testrbd 128
# ceph osd dump |grep -i size
# rbd -p testrbd create test_image --size 1024
# rbd -p testrbd ls
# rbd -p testrbd --image test_image info
# rbd -p testrbd --image test_image resize --size 2048
# rbd -p testrbd --image test_image info
# rbd -p testrbd --image test_image resize --size 4096
# rbd -p testrbd --image test_image info
# rbd -p testrbd --image test_image resize --size 1024 --allow-shrink
# rbd -p testrbd --image test_image info
或者
# rbd info poolcopy2/rbdimage2
#rbd create rbdtest --size 1024 新建
# rbd rm rbdtest 删除
# rbd map -p testrbd test_image 映射到本地
# rbd showmapped 查看映射
# rbd unmap aa 接触映射
# rbd rm aa 删除
# lsblk
# rbd showmapped
# mkfs.ext4 /dev/rbd0
# mkdir /rbdtest
# mount /dev/rbd0 /rbdtest/1.1 块 rbd 简化命令
1，查看存储池
# rados lspools
2，创建存储池
# rados mkpool pooltest
successfully created pool pooltest
3，在指定存储池创建RBD
# rbd create pooltest/imagerbd --size 1023 --image-format 2 --order 24
4，查看存储池块列表
# rbd ls pooltest
5，查看存储池块信息
# rbd info pooltest/imagerbd
rbd image 'imagerbd':
size 1023 MB in 64 objects
order 24 (16384 kB objects)
block_name_prefix: rbd_data.67a6d6b8b4567
format: 2
features: layering
flags:
6，删除image
# rbd rm pooltest/imagerbd
Removing image: 100% complete...done.
# rbd ls pooltest
7.RBD映射到本地，格式化，挂载使用
# rbd ls poolcopy2
luncopy2
rbdimage1
rbdimage2
# rbd map poolcopy2/rbdimage1
/dev/rbd1
# mkfs.ext4 /dev/rbd1
# mount /dev/rbd1 /mnt/localrbdimage1/
# df -Th
/dev/rbd1 ext4 2.0G 6.0M 1.8G 1% /mnt/localrbdimage11.2 创建指定条带大小的rbd
# rbd create poolcopy2/rbd16Mimage --size 10240 --image-format 2 --order 24
# rbd -p poolcopy2 --image rbd16Mimage info 或者 # rbd info poolcopy2/rbdimage2
rbd image 'rbd16Mimage':
size 10240 MB in 640 objects
order 24 (16384 kB objects)
block_name_prefix: rbd_data.6613e6b8b4567
format: 2
features: layering
flags:
# --order 24 为2^24bytes 为16M，条带大小为16M
# --order 22 为2^22bytes 为4M，条带大小为4M
2. 创建rbd
# rbd create poolcopy2/rbdimage1 --size 2048 --image-format 2
format 2 支持RBD分层，实现COW，可写快照
默认是format 1 原始格式 不支持RBD分层
# rbd -p poolcopy2 ls
luncopy2
rbdimage1
长格式查看
# rbd ls poolcopy2 -l
NAME SIZE PARENT FMT PROT LOCK
luncopy2 5120M 2
luncopy2@snapcopy01 5120M 2 yes
rbdimage1 2048M 2
rbdimage1@rbdimage1_snap 2048M 2
rbdimage2 3072M 2
# rbd -p poolcopy2 --image rbdimage1 info
rbd image 'rbdimage1':
size 2048 MB in 512 objects
order 22 (4096 kB objects)
block_name_prefix: rbd_data.8e1216b8b4567
format: 2
features: layering
flags:
3. 创建快照snapshot，快照保护，快照克隆，快照分层取消快照父子关系
1，查看快照
# rbd snap list poolcopy2/luncopy2
SNAPID NAME SIZE
4 snapcopy01 5120 MB
# rbd snap ls poolcopy2/luncopy2
SNAPID NAME SIZE
4 snapcopy01 5120 MB
2，查看存储池 rbd 所有快照 ，使用长格式
# rbd ls poolcopy2 -l
3，创建快照
# rbd snap create poolcopy2/rbdimage2@snap_image
# rbd snap ls poolcopy2/rbdimage2
SNAPID NAME SIZE
7 snap_image 3072 MB
4，查看快照详细信息
# rbd info poolcopy2/rbdimage2@snap_image
rbd image 'rbdimage2':
size 3072 MB in 768 objects
order 22 (4096 kB objects)
block_name_prefix: rbd_data.652746b8b4567
format: 2
features: layering
flags:
protected: False
5，快照克隆（快照处于保护状态）
# rados lspools
poolcopy2
# rbd ls poolcopy2
rbdimage1
# rbd snap ls poolcopy2/rbdimage1
SNAPID NAME SIZE
5 rbdimage1_snap 2048 MB
# rbd info poolcopy2/rbdimage1@rbdimage1_snap
rbd image 'rbdimage1':
size 2048 MB in 512 objects
order 22 (4096 kB objects)
block_name_prefix: rbd_data.8e1216b8b4567
format: 2
features: layering
flags:
protected: False # 快照未保护
5.1，设置快照保护
# rbd snap protect poolcopy2/rbdimage1@rbdimage1_snap
# rbd info poolcopy2/rbdimage1@rbdimage1_snap
rbd image 'rbdimage1':
size 2048 MB in 512 objects
order 22 (4096 kB objects)
block_name_prefix: rbd_data.8e1216b8b4567
format: 2
features: layering
flags:
protected: True # 快照已保护
5.2 快照克隆（克隆快照到另外一个存储池并成为一个新的image）,也叫可写快照
# rbd clone poolcopy2/rbdimage1@rbdimage1_snap pooltest/rbdimage1_snap_clone
# rbd ls pooltest -l
NAME SIZE PARENT FMT PROT LOCK
rbdimage1_snap_clone 2048M poolcopy2/rbdimage1@rbdimage1_snap 2
5.3 查看快照的子image
# rbd children poolcopy2/rbdimage1@rbdimage1_snap
pooltest/rbdimage1_snap_clone
5.4 把分层的rbd image 变为扁平的没有父子层级的image,
# rbd flatten pooltest/rbdimage1_snap_clone
Image flatten: 99% complete...2017-11-15 18:29:19.110186 7f0587b32700 0 monclient: hunting for new mon
Image flatten: 100% complete...done.
# rbd ls pooltest -l
NAME SIZE PARENT FMT PROT LOCK
rbdimage1_snap_clone 2048M 2
解除了rbd快照的父子关系
5.4 RBD 导入和导出（用于RBD块设备的备份和恢复）
# rbd export poolcopy2/luncopy2 /root/export/luncopy2_export
Exporting image: 100% complete...done.
# cd export/;ls -lh
-rw-r--r-- 1 root root 5.0G Nov 15 18:49 luncopy2_export
导入
# rbd import /root/export/luncopy2_export pooltest/image --image-format 2
报错，提示已经存在，4. 快命令总结
创建快照：
rbd snap create {pool-name}/{image-name}@{snap-name}
列出快照：
rbd snap ls {pool-name}/{image-name}
列出存储池块和快照
rbd ls {pool-name} -l
快照回滚：
rbd snap rollback {pool-name}/{image-name}@{snap-name}
删除快照：
rbd snap rm {pool-name}/{image-name}@{snap-name}
参考：
1.快照
2.RBD命令