MOUNT.CEPH(8) - Linux man page online | Administration and privileged commands

Mount a ceph file system.

May 19, 2020


mount.ceph - mount a ceph file system


mount.ceph monaddr1[,monaddr2,...]:/[subdir] dir [ -o options ]


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 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.


wsize int (bytes), max write size. Default: none (writeback uses smaller of wsize and stripe unit) rsize int (bytes), max read size. Default: none rasize int (bytes), max readahead, multiple of 1024, Default: 8388608 (8192*1024) osdtimeout int (seconds), Default: 60 osdkeepalive 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 directo‐ ries. nocrc no data crc on writes noasyncreaddir no dcache readdir


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


mount.ceph is part of Ceph, a massively scalable, open-source, distributed storage system. Please refer to the Ceph documentation at for more information.


ceph-fuse(8), ceph(8)
2010-2020, Inktank Storage, Inc. and contributors. Licensed under Creative Commons Attri‐ bution Share Alike 3.0 (CC-BY-SA-3.0)
dev May 19, 2020 MOUNT.CEPH(8)
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