ceph-mon8
Ceph monitor daemon
Usage
ceph-mon -i
monid
[--mon-data
mondatapath]
Overview
ceph-mon is the cluster monitor daemon for the Ceph distributed file system. One or more instances of ceph-mon form a Paxos part-time parliament cluster that provides extremely reliable and durable storage of cluster membership, configuration, and state.
The mondatapath refers to a directory on a local file system storing monitor data. It is normally specified via the mon data option in the configuration file.
Options
-
-f, --foreground -
Foreground: do not daemonize after startup (run in foreground). Do not generate a pid file. Useful when run via ceph-run(8).
-
-d -
Debug mode: like
-f, but also send all log output to stderr.
-
--setuser userorgid -
Set uid after starting. If a username is specified, the user record is looked up to get a uid and a gid, and the gid is also set as well, unless --setgroup is also specified.
-
--setgroup grouporgid -
Set gid after starting. If a group name is specified the group record is looked up to get a gid.
-
-c ceph.conf, --conf=ceph.conf -
Use ceph.conf configuration file instead of the default
/etc/ceph/ceph.confto determine monitor addresses during startup.
-
--mkfs -
Initialize the mon data directory with seed information to form and initial ceph file system or to join an existing monitor cluster. Three pieces of information must be provided:
- •
-
The cluster fsid. This can come from a monmap (--monmap <path>) or explicitly via --fsid <uuid>.
- •
-
A list of monitors and their addresses. This list of monitors can come from a monmap (--monmap <path>), the mon host configuration value (in ceph.conf or via
-mhost1,host2,...), or (for backward compatibility) the deprecated mon addr lines in ceph.conf. If this monitor is to be part of the initial monitor quorum for a new Ceph cluster, then it must be included in the initial list, matching either the name or address of a monitor in the list. When matching by address, either the public addr orpublicsubnetoptions may be used.
- •
-
The monitor secret key
mon.. This must be included in the keyring provided via --keyring <path>.
-
--keyring -
Specify a keyring for use with
--mkfs.
-
--no-config-file -
Signal that we don't want to rely on a ceph.conf, either user provided or the default, to run the daemon. This will entail providing all necessary options to the daemon as arguments.
Releases
6 releases since Debian 8 (Jessie); the text changed 5 times.
--no-config-file since Debian 12 (Bookworm);
--setgroup since Debian 9 (Stretch);
--setuser since Debian 9 (Stretch).