mount.ceph man page

mount.ceph — mount a ceph file system

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. It serves to resolve monitor hostname(s) into IP addresses and read authentication keys from disk; the Linux kernel client component does most of the real work. In fact, it is possible to mount a non-authenticated 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.

Mount helper application conventions dictate that the first two options are device to be mounted and destination path. Options must be passed only after these fixed arguments.

Options

wsize
int, max write size. Default: none (writeback uses smaller of wsize and stripe unit)
rsize
int (bytes), max readahead, multiple of 1024, Default: 524288 (512*1024)
osdtimeout
int (seconds), Default: 60
osdkeepalivetimeout
int, Default: 5
mount_timeout
int (seconds), Default: 60
osd_idle_ttl
int (seconds), Default: 60
caps_wanted_delay_min
int, cap release delay, Default: 5
caps_wanted_delay_max
int, cap release delay, Default: 60
cap_release_safety
int, Default: calculated
readdir_max_entries
int, Default: 1024
readdir_max_bytes
int, Default: 524288 (512*1024)
write_congestion_kb
int (kb), max writeback in flight. scale with available memory. Default: calculated from available memory
snapdirname
string, set the name of the hidden snapdir. Default: .snap
name
RADOS user to authenticate as when using cephx. Default: guest
secret
secret key for use with cephx. This option is insecure because it exposes the secret on the command line. To avoid this, use the secretfile option.
secretfile
path to file containing the secret key to use with cephx
ip
my ip
noshare
create a new client instance, instead of sharing an existing instance of a client mounting the same cluster
dirstat
funky cat dirname for stats, Default: off
nodirstat
no funky cat dirname for stats
rbytes
Report the recursive size of the directory contents for st_size on directories. Default: on
norbytes
Do not report the recursive size of the directory contents for st_size on directories.
nocrc
no data crc on writes
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 ceph-mon(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 Ceph, a massively scalable, open-source, distributed storage system. Please refer to the Ceph documentation at http://ceph.com/docs for more information.

See Also

ceph-fuse(8), ceph(8)

Info

Oct 26, 2016 dev Ceph