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 188.8.131.52:/ 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.
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 http://ceph.com/docs for more information.