ceph – ceph file system control utility

Synopsis

ceph [ -m monaddr ] [ -w | command ... ]

Description

ceph is a control utility for communicating with the monitor cluster of a running Ceph distributed file system.

There are three basic modes of operation.

Interactive mode

To start in interactive mode, no arguments are necessary. Control-d or ‘quit’ will exit.

Watch mode

Watch mode shows cluster state changes as they occur. For example:

ceph -w

Command line mode

Finally, to send a single instruction to the monitor cluster (and wait for a response), the command can be specified on the command line.

Options

-i infile

will specify an input file to be passed along as a payload with the command to the monitor cluster. This is only used for specific monitor commands.

-o outfile

will write any payload returned by the monitor cluster with its reply to outfile. Only specific monitor commands (e.g. osd getmap) return a payload.

-c ceph.conf, --conf=ceph.conf

Use ceph.conf configuration file instead of the default /etc/ceph/ceph.conf to determine monitor addresses during startup.

-m monaddress[:port]

Connect to specified monitor (instead of looking through ceph.conf).

Examples

To grab a copy of the current OSD map:

ceph -m 1.2.3.4:6789 osd getmap -o osdmap

To get a dump of placement group (PG) state:

ceph pg dump -o pg.txt

Monitor commands

A more complete summary of commands understood by the monitor cluster can be found in the online documentation, at

http://ceph.com/docs/master/rados/operations/control

Availability

ceph is part of the Ceph distributed file system. Please refer to the Ceph documentation at http://ceph.com/docs for more information.

See also

ceph(8), mkcephfs(8)