mirror of
https://github.com/ceph/ceph
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0c2c3e0316
The default was changed from on to off in 4.6 because the way rbytes behaves can be surprising and sometimes confuses tools like rsync. Signed-off-by: Xiang Dai <764524258@qq.com>
168 lines
4.1 KiB
ReStructuredText
168 lines
4.1 KiB
ReStructuredText
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========================================
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mount.ceph -- mount a ceph file system
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========================================
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.. program:: mount.ceph
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Synopsis
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========
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| **mount.ceph** *monaddr1*\ [,\ *monaddr2*\ ,...]:/[*subdir*] *dir* [
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-o *options* ]
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Description
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===========
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**mount.ceph** is a simple helper for mounting the Ceph file system on
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a Linux host. It serves to resolve monitor hostname(s) into IP
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addresses and read authentication keys from disk; the Linux kernel
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client component does most of the real work. In fact, it is possible
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to mount a non-authenticated Ceph file system without mount.ceph by
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specifying monitor address(es) by IP::
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mount -t ceph 1.2.3.4:/ mountpoint
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Each monitor address monaddr takes the form host[:port]. If the port
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is not specified, the Ceph default of 6789 is assumed.
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Multiple monitor addresses can be separated by commas. Only one
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responsible monitor is needed to successfully mount; the client will
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learn about all monitors from any responsive monitor. However, it is a
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good idea to specify more than one in case one happens to be down at
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the time of mount.
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A subdirectory subdir may be specified if a subset of the file system
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is to be mounted.
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Mount helper application conventions dictate that the first two
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options are device to be mounted and destination path. Options must be
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passed only after these fixed arguments.
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Options
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=======
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:command:`wsize`
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int (bytes), max write size. Default: 16777216 (16*1024*1024) (writeback uses smaller of wsize
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and stripe unit)
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:command:`rsize`
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int (bytes), max read size. Default: 16777216 (16*1024*1024)
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:command:`rasize`
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int (bytes), max readahead. Default: 8388608 (8192*1024)
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:command:`osdtimeout`
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int (seconds), Default: 60
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:command:`osdkeepalive`
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int, Default: 5
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:command:`mount_timeout`
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int (seconds), Default: 60
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:command:`osd_idle_ttl`
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int (seconds), Default: 60
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:command:`caps_wanted_delay_min`
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int, cap release delay, Default: 5
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:command:`caps_wanted_delay_max`
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int, cap release delay, Default: 60
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:command:`cap_release_safety`
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int, Default: calculated
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:command:`readdir_max_entries`
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int, Default: 1024
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:command:`readdir_max_bytes`
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int, Default: 524288 (512*1024)
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:command:`write_congestion_kb`
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int (kb), max writeback in flight. scale with available
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memory. Default: calculated from available memory
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:command:`snapdirname`
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string, set the name of the hidden snapdir. Default: .snap
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:command:`name`
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RADOS user to authenticate as when using cephx. Default: guest
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:command:`secret`
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secret key for use with cephx. This option is insecure because it exposes
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the secret on the command line. To avoid this, use the secretfile option.
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:command:`secretfile`
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path to file containing the secret key to use with cephx
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:command:`ip`
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my ip
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:command:`noshare`
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create a new client instance, instead of sharing an existing
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instance of a client mounting the same cluster
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:command:`dirstat`
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funky `cat dirname` for stats, Default: off
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:command:`nodirstat`
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no funky `cat dirname` for stats
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:command:`rbytes`
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Report the recursive size of the directory contents for st_size on
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directories. Default: off
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:command:`norbytes`
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Do not report the recursive size of the directory contents for
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st_size on directories.
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:command:`nocrc`
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no data crc on writes
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:command:`noasyncreaddir`
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no dcache readdir
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Examples
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========
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Mount the full file system::
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mount.ceph monhost:/ /mnt/foo
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If there are multiple monitors::
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mount.ceph monhost1,monhost2,monhost3:/ /mnt/foo
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If :doc:`ceph-mon <ceph-mon>`\(8) is running on a non-standard
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port::
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mount.ceph monhost1:7000,monhost2:7000,monhost3:7000:/ /mnt/foo
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To mount only part of the namespace::
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mount.ceph monhost1:/some/small/thing /mnt/thing
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Assuming mount.ceph(8) is installed properly, it should be
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automatically invoked by mount(8) like so::
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mount -t ceph monhost:/ /mnt/foo
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Availability
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============
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**mount.ceph** is part of Ceph, a massively scalable, open-source, distributed storage system. Please
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refer to the Ceph documentation at http://ceph.com/docs for more
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information.
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See also
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========
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:doc:`ceph-fuse <ceph-fuse>`\(8),
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:doc:`ceph <ceph>`\(8)
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