[Openais] Configurability of Corosync

Angus Salkeld asalkeld at redhat.com
Wed Aug 11 22:03:32 PDT 2010


On Thu, Aug 12, 2010 at 08:30:17AM +0530, Sampathkumar, Kishore wrote:
> On Saturday, August 07, 2010 10:49 PM, Steven Dake wrote:
> +
> + On 08/05/2010 03:13 AM, Sampathkumar, Kishore wrote:
> + > Hi,
> + >
> + > I wanted to understand what aspects of Corosync are configurable today.
> + >
> + > So far, what I have found is the following:
> + > - ENVIRONMENT VARIABLES listed in corosync_overview(8) man page
> + > - All configurable values listed in corosync.conf(5) man page.
> + >
> + > Is there anything else?
> + >
> +
> + those are all the config parameters.
> +
> + > Also, is there a way I can control the amount of multicast traffic? As
> + > an example, on an "idle" corosync cluster, I was noticing the output of
> + > "tcpdump ip multicast". I wanted to know if I can control the frequency
> + > of this multicast.
> +
> + The idle multicast traffic you are witnessing is a result of the "merge"
> + timeout parameter which defaults to 200mseec and sends out a multicast on
> + this period.
> +
> + For clusters under full load, the window_size and max_messages parameters
> + can limit the multicasts sent.
> 
> What I'm finding is missing in the above man pages are the following:
> - configuration options for the event service.
> - configuration option to specify a 'service' using a top level directive,
>   and the configuration options for each of the services.
> 
> Are the above specified somewhere?
> - man pages?
> - embedded in comments in code?
> - email exchanges?
> - separate README and/or documentation files?

Hi Kishore

The event service is a part of openais (I am not particualy familar with it).
But I can't find any special configuration options to it.

For general service howto's:

Have a look in corosync/README.devmap
and
http://www.corosync.org/doku.php?id=dev:plugin_cluster_services

Regards
Angus
> 
> Thanks and Regards,
> - Kishore
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