Name¶
ganeti-confd - Ganeti conf daemon
Synopsis¶
ganeti-confd [-f] [-d]
DESCRIPTION¶
ganeti-confd is a daemon used to answer queries related to the
configuration of a Ganeti cluster.
For testing purposes, you can give the
-f option and the program won't
detach from the running terminal.
Debug-level message can be activated by giving the
-d option.
ROLE¶
The role of the conf daemon is to make sure we have a highly available and very
fast way to query cluster configuration values. This daemon is automatically
active on all master candidates, and so has no single point of failure. It
communicates via UDP so each query can easily be sent to multiple servers, and
it answers queries from a cached copy of the config it keeps in memory, so no
disk access is required to get an answer.
The config is reloaded from disk automatically when it changes, with a rate
limit of once per second.
If the conf daemon is stopped on all nodes, its clients won't be able to get
query answers.
COMMUNICATION PROTOCOL¶
The confd protocol is an HMAC authenticated json-encoded custom format, over
UDP. A client library is provided to make it easy to write software to query
confd. More information can be found in the Ganeti 2.1 design doc, and an
example usage can be seen in the (external) NBMA daemon for Ganeti.
REPORTING BUGS¶
Report bugs to project website (
http://code.google.com/p/ganeti/) or contact the
developers using the Ganeti mailing list (ganeti@googlegroups.com).
SEE ALSO¶
Ganeti overview and specifications:
ganeti(7) (general overview),
ganeti-os-interface(7) (guest OS definitions).
Ganeti commands:
gnt-cluster(8) (cluster-wide commands),
gnt-job(8) (job-related commands),
gnt-node(8) (node-related
commands),
gnt-instance(8) (instance commands),
gnt-os(8) (guest
OS commands),
gnt-group(8) (node group commands),
gnt-backup(8)
(instance import/export commands),
gnt-debug(8) (debug commands).
Ganeti daemons:
ganeti-watcher(8) (automatic instance restarter),
ganeti-cleaner(8) (job queue cleaner),
ganeti-noded(8) (node
daemon),
ganeti-masterd(8) (master daemon),
ganeti-rapi(8)
(remote API daemon).
Ganeti htools:
htools(1) (generic binary),
hbal(1) (cluster
balancer),
hspace(1) (capacity calculation),
hail(1) (IAllocator
plugin),
hscan(1) (data gatherer from remote clusters).
COPYRIGHT¶
Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Google Inc. Permission is
granted to copy, distribute and/or modify under the terms of the GNU General
Public License as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
On Debian systems, the complete text of the GNU General Public License can be
found in /usr/share/common-licenses/GPL.