On Fri, Feb 17, 2012 at 01:15:04PM +0100, Dejan Muhamedagic wrote:
> On Fri, Feb 17, 2012 at 12:13:49PM +1100, Andrew Beekhof wrote:
[...]
> > What about notifications? The would be the right point to
> > re-configure things I'd have thought.
>
> Sounds like the right way. Still, it may be hard to coordinate
> between different instances. Unless we figure out how to map
> nodes to numbers used by the CLUSTERIP. For instance, the notify
> operation gets:
>
> OCF_RESKEY_CRM_meta_notify_stop_resource="ip_lb:2 "
> OCF_RESKEY_CRM_meta_notify_stop_uname="xen-f "
>
> But the instance number may not match the node number from
Scratch that.
IP_CIP_FILE="/proc/net/ipt_CLUSTERIP/$OCF_RESKEY_ip"
IP_INC_NO=`expr ${OCF_RESKEY_CRM_meta_clone:-0} + 1`
...
echo "+$IP_INC_NO" >$IP_CIP_FILE
> /proc/net/ipt_CLUSTERIP/<ip> and that's where we should add the
> node. It should be something like:
>
> notify() {
> if node_down; then
> echo "+node_num" >> /proc/net/ipt_CLUSTERIP/<ip>
> elif node_up; then
> echo "-node_num" >> /proc/net/ipt_CLUSTERIP/<ip>
> fi
> }
>
> Another issue is that the above code should be executed on
> _exactly_ one node.
OK, I guess that'd also be doable by checking the following
variables:
OCF_RESKEY_CRM_meta_notify_inactive_resource (set of
currently inactive instances)
OCF_RESKEY_CRM_meta_notify_stop_resource (set of
instances which were just stopped)
Any volunteers for a patch? :)
Thanks,
Dejan
> Cheers,
>
> Dejan
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