[Pacemaker] custom resource-agent

[Dejan Muhamedagic]

Hi David,

On Mon, Sep 30, 2013 at 12:41:23PM -0700, David Lang wrote:
> On Mon, 30 Sep 2013, David Lang wrote:
> 
> >On Mon, 30 Sep 2013, Michael Schwartzkopff wrote:
> >
> >>Am Montag, 30. September 2013, 21:12:56 schrieb Peter Romfeld:
> >>>I am working in AWS i cant just use a VIP i need to use a floating
> >>>secondary IP which i reassign through script, i want to let pacemaker
> >>>handle the reassignment...
> >>
> >>Please explain the difference of a VIP and a "secondary IP" in
> >>your opinion.
> >
> >with AWS you need to inform amazon of the change, not just change
> >the IP on the local box, that requires much more work than a
> >simple local VIP
> 
> being more detailed, instead of just
> ifconfig eth0:0 $vip
> you have to do something like
> 
> /opt/aws/bin/ec2-assign-private-ip-addresses -n $ENI_ID --secondary-private-ip-address $VIP --allow-reassignment --region $REGION

We may consider adding such an option to IPaddr2. Has anybody
ever tried that?

> pingresult=`ping -c 1 -W 1 $VIP | grep time= | wc -l`
> if [ "$pingresult" == "0" ]; then
>   echo `date` "-- Restarting network"
>   /sbin/service network restart > /dev/null 2>&1

That may break the cluster communication, which may lead to split
brain, etc. Is that really the only way?

Thanks,

Dejan

> fi
> 
> this is horribly slow by comparison to VIP takover on normal local
> systems, but it can still be far faster than killing a system and
> spinning up a replacement.
> 
> David Lang

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