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|
========================================
mount.ceph -- mount a ceph file system
========================================
.. program:: mount.ceph
Synopsis
========
| **mount.ceph** *monaddr1*\ [,\ *monaddr2*\ ,...]:/[*subdir*] *dir* [
-o *options* ]
Description
===========
**mount.ceph** is a simple helper for mounting the Ceph file system on
a Linux host. The only real purpose it serves is to resolve monitor
hostname(s) into IP addresses; the Linux kernel client component does
most of the real work. In fact, it is possible to mount a Ceph file
system without mount.ceph by specifying monitor address(es) by IP::
mount -t ceph 1.2.3.4:/ mountpoint
Each monitor address monaddr takes the form host[:port]. If the port
is not specified, the Ceph default of 6789 is assumed.
Multiple monitor addresses can be separated by commas. Only one
responsible monitor is needed to successfully mount; the client will
learn about all monitors from any responsive monitor. However, it is a
good idea to specify more than one in case one happens to be down at
the time of mount.
A subdirectory subdir may be specified if a subset of the file system
is to be mounted.
Options
=======
:command:`wsize`
int, max write size. Default: none (writeback uses smaller of wsize
and stripe unit)
:command:`rsize`
int (bytes), max readahead, multiple of 1024, Default: 524288
(512*1024)
:command:`osdtimeout`
int (seconds), Default: 60
:command:`osdkeepalivetimeout`
int, Default: 5
:command:`mount_timeout`
int (seconds), Default: 60
:command:`osd_idle_ttl`
int (seconds), Default: 60
:command:`caps_wanted_delay_min`
int, cap release delay, Default: 5
:command:`caps_wanted_delay_max`
int, cap release delay, Default: 60
:command:`cap_release_safety`
int, Default: calculated
:command:`readdir_max_entries`
int, Default: 1024
:command:`readdir_max_bytes`
int, Default: 524288 (512*1024)
:command:`write_congestion_kb`
int (kb), max writeback in flight. scale with available
memory. Default: calculated from available memory
:command:`snapdirname`
string, set the name of the hidden snapdir. Default: .snap
:command:`name`
string, used with authx, Default: guest
:command:`secret`
string, used with authx
:command:`ip`
my ip
:command:`noshare`
create a new client instance, instead of sharing an existing
instance of a client mounting the same cluster
:command:`dirstat`
funky `cat dirname` for stats, Default: off
:command:`nodirstat`
no funky `cat dirname` for stats
:command:`rbytes`
Report the recursive size of the directory contents for st_size on
directories. Default: on
:command:`norbytes`
Do not report the recursive size of the directory contents for
st_size on directories.
:command:`nocrc`
no data crc on writes
:command:`noasyncreaddir`
no dcache readdir
Examples
========
Mount the full file system::
mount.ceph monhost:/ /mnt/foo
If there are multiple monitors::
mount.ceph monhost1,monhost2,monhost3:/ /mnt/foo
If cmon(8) is running on a non-standard port::
mount.ceph monhost1:7000,monhost2:7000,monhost3:7000:/ /mnt/foo
To mount only part of the namespace::
mount.ceph monhost1:/some/small/thing /mnt/thing
Assuming mount.ceph(8) is installed properly, it should be
automatically invoked by mount(8) like so::
mount -t ceph monhost:/ /mnt/foo
Availability
============
**mount.ceph** is part of the Ceph distributed file system. Please
refer to the Ceph wiki at http://ceph.newdream.net/wiki for more
information.
See also
========
:doc:`cfuse <cfuse>`\(8),
:doc:`ceph <ceph>`\(8)
|
