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Martin Schwenke b97625acb6 Eventscripts: add a synchronous synthetic reconfigure event. In the current code services can only be reconfigured asynchronously. This means that configuration file changes can be made, an asychronous reconfigure event can be triggered, and it always succeeds. Some time later when a service is actually reconfigured then a failure may be seen This adds a synthetic reconfigure event that reconfigures a service synchronously so that any failure is reported on exit. ctdb_service_check_reconfigure() is essentially reimplemented. If a reconfigure event is in flight and an ipreallocated or monitor event occurs then any scheduled asynchronous reconfigure is deferred until the next monitor cycle. This is to avoid reconfigures trampling on each other. In this case a monitor event will also replay the previous status to try to avoid exposing any temporary instability. If a reconfigure event collides with another reconfigure event it will exit with status 2, indicating that the reconfigure should be retried. The reconfigure event is implemented using a subprocess to control the exit from the synthetic event. As before, if a monitor event causes a scheduled synchronous reconfigure to occure then it will replay the previous status for the service, given that a reconfigure can cause temporary instability. Signed-off-by: Martin Schwenke <martin@meltin.net> (This used to be ctdb commit 220578bfd3507152b29ba4c28942f9d5e8733886)		2011-08-30 14:29:48 +10:00
..
events.d	Eventscripts - call ctdb_check_args() in 00.ctdb	2011-08-30 09:33:47 +10:00
ctdb-crash-cleanup.sh	In the example script to remove all ip addresses after a ctdb crash,	2010-04-23 09:08:26 +10:00
ctdb.init	When starting and stopping ctdb through the init-script, make sure we first clear all public ips bvefore we start the daemon, in case they are still hanging around since a previous kill -9 and also make sure we drop them after we have stopped the deamon when shutting down	2011-08-11 11:48:04 +10:00
ctdb.sysconfig	Eventscripts: New configuration variable CTDB_SERVICE_AUTOSTARTSTOP.	2011-08-30 09:33:47 +10:00
functions	Eventscripts: add a synchronous synthetic reconfigure event.	2011-08-30 14:29:48 +10:00
gdb_backtrace	lib/util: import fault/backtrace handling from samba.	2010-01-20 09:44:36 +01:00
interface_modify.sh	Scripts: remove absolute paths from interface_modify.sh.	2011-08-08 15:50:10 +10:00
notify.sh	server: add "setup" event	2010-02-23 10:38:49 +01:00
README	Scripts: add note about not using absolute command paths to README.	2011-08-09 16:36:37 +10:00
statd-callout	Eventscripts: remove unnecessary absolute paths from external commands.	2011-08-03 17:19:15 +10:00

README

This directory contains run-time support scripts for CTDB.

Selected highlights:

  ctdb.init

    An initscript for starting ctdbd at boot time.

  events.d/

    Eventscripts.  See events.d/README for more details.

  functions

    Support functions, sourced by eventscripts and other scripts.

  interface_modify.sh

    Script to support add/remove IPs and other funky stuff.  Not sure
    why this is separate... but it certainly allows easy wrapping by
    flock.

  statd-callout

    rpc.statd high-availability callout to support lock migration on
    failover.

Notes:

* All of these scripts are written in POSIX Bourne shell.  Please
  avoid bash-isms, including the use of "local" variables (which are
  not available in POSIX shell).

* Do not use absolute paths for commands.  Unit tests attempt to
  replace many commands with stubs and can not do this if commands are
  specified with absolute paths.  The functions file controls $PATH so
  absolute paths should not be required.