ceph高级工具---ceph-objectstore-tool

0、简介
ceph-objectstore-tool工具是ceph提供的一个可以操作object和pg的工具，可以用来查看、修改、删除ObjectStore上的object、pg以及dump OSD journal中的数据，这个工具的使用要谨慎，它可能会造成数据的永久丢失

1、ceph-objectstore-tool -h 帮助信息分析学习
Must provide --data-path 必须指定 --data-path

Allowed options:
–help produce help message
–type arg Arg is one of [bluestore, filestore (default),
memstore] //指定文件存储类型---------------这三种store是做什么的？？
–data-path arg path to object store, mandatory//对象存储的路径，必须指定
–journal-path arg path to journal, use if tool can’t find it 如果工具不能够找到日志的路径则需要指定
–pgid arg PG id, mandatory for info, log, remove, export,
rm-past-intervals, mark-complete, and mandatory
for apply-layout-settings if --pool is not
specified//PG ID号，如果资源池名称没有被指定，则强制info，log，remove，export，rm-past-intervals，mark-complete强制应用底层设置 ---------------
–pool arg Pool name, mandatory for apply-layout-settings if
–pgid is not specified //资源池名称，如果pg id没有被指定，则强制应用底层设置
–op arg Arg is one of [info, log, remove, mkfs, fsck, //参数时括号中的其中一个
fuse, dup, export, import, list, fix-lost,
list-pgs, rm-past-intervals, dump-journal,
dump-super, meta-list, get-osdmap, set-osdmap,
get-inc-osdmap, set-inc-osdmap, mark-complete,
apply-layout-settings, update-mon-db]
–epoch arg epoch# for get-osdmap and get-inc-osdmap, the //指定osd map的版本号，如果没有被指定，则当前的版本号将被使用
current epoch in use if not specified
–file arg path of file to export, import, get-osdmap, //指定一个文件，执行一写相关操作
set-osdmap, get-inc-osdmap or set-inc-osdmap
–mon-store-path arg path of monstore to update-mon-db //mon store的路径
–fsid arg fsid for new store created by mkfs //新存储的fsid
–target-data-path arg path of target object store (for --op dup) //目标对象存储的路径
–mountpoint arg fuse mountpoint //fuse挂载点
–format arg (=json-pretty) Output format which may be json, json-pretty, //指定输出格式
xml, xml-pretty
–debug Enable diagnostic output to stderr //开启debug
–force Ignore some types of errors and proceed with
operation - USE WITH CAUTION: CORRUPTION POSSIBLE
NOW OR IN THE FUTURE
–skip-journal-replay Disable journal replay //disable 日志重放
–skip-mount-omap Disable mounting of omap //disable mount omap
–head Find head/snapdir when searching for objects by
name //寻找原始对象和快照对象
–dry-run Don’t modify the objectstore //不更改对象存储
–namespace arg Specify namespace when searching for objects //当寻找对象的时候，指定命名空间

Positional syntax:

ceph-objectstore-tool …