[Linux-ha-dev] Dynamic Modify the timeout values

[DAIKI MATSUDA]

> > Hi, All
> >
> > I add the new function for heartbeat-2.0.8 and attached its patch file.
> >
> > The function is to apply the new timeout parameters ( keepalive,
> > deadtime, deadping, warntime ) without stopping the heartbeat services.
> > Currently heartbeat boot scripts supply the 'reload' or 'forcereload'
> > function, but it, they are same, does stop the services and the HA
> > services are moved to standby node, because its process kills the forked
> > heartbeat processes and clients ( crmd etc. ).
> > So, we think to without suspending the services make the changing
> > parameters to apply to driving nodes. Current feature is following.
> > 1. changing ha.cf <http://ha.cf> file for 4 parameters
> > 2. send working parent heartbeat process signal SIGRTMAX ( e.g. kill -s
> > SIGRTMAX `cat /var/run/heartbeat.pid` (Why do I choose SIGRTMAX? I do
> > not find the unused good signal.)
> >
> > As we research the heatbeat, it may be safety. And I want to listen to
> > your issues for patch and functions.
>
> Sorry to be coming in so late on this, but I was working on the release
> for many weeks now.  I really like the idea of dynamically modifying the
> heartbeat configuration - but if you're going to go to the trouble to do
> it, I'd like to see it done more generally.
>
> In other words, I'd like to be able to change nearly any  parameter in
> ha.cf at run time without restarting heartbeat.
>
> This would require reworking (and improving) the way heartbeat starts
> up.  This would be probably about twice or three times as much work as
> what you've done, but it would be much more useful, and much more general.
>
> In the end, if done right, it could be groundwork to letting let us
> eventually be able receive config updates from the CIB.  [I know there's
> a bootstrapping issue, but we can deal with that when we get to deciding
> to do that work].
>
> I have thought about this and have some specific ideas on what kinds of
> things need to be done to make this happen.

Hi, Alan.

I understood what you say and think it is very good idea to tread all
parameters in ha.cf. I thought my implementation is for testing and it
is better that you, ha-dev team, make its feature.

MATSUDA, Daiki