========================================== ceph -- ceph file system control utility ========================================== .. program:: ceph 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 ======= .. option:: -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. .. option:: -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. .. option:: -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. .. option:: -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 ======== :doc:`ceph `\(8), :doc:`mkcephfs `\(8)