[ClusterLabs] Passing and binding to virtual IP in my service

[Nikhil Utane]

Aah. Got it. Forgot about the ip addr command.
Cool. So now I have the option to bind as well as use route command.
Kristoffer answered about using attribute references so I should be all set.
Thanks Guys.

On Thu, Jan 7, 2016 at 4:12 PM, Jorge Fábregas <jorge.fabregas at gmail.com>
wrote:

> On 01/07/2016 05:28 AM, Nikhil Utane wrote:
> > So my question is, how to pass the virtual IP to my UDPSend OCF agent so
> > that it can then bind to the vip? This will ensure that all messages
> > initiated by my UDPSend goes from vip.
>
> Hi,
>
> I don't know how ping -I does it (what system call it uses) but I think
> you'll have to implement that if you want your program to source
> connection from a particular virtual IP.
>
> As far as I know, the way this is usually done these days is by creating
> routes.  Something like:
>
> ip route change 192.168.14.0/24 dev eth0 src 192.168.14.4
>
>
> > Out of curiosity, where is this virtual IP stored in the kernel?
> > I expected to see a secondary interface ( for e.g. eth0:1) with the vip
> > but it isn't there.
>
> Well, in the old days we used to have a "virtual interface" (eth0:1,
> eth0:2 etc) but the proper modern way is to use "virtual addresses"
> within a single interface.  The caveat is that you need to use the ip
> command to show these virtual addresses (ifconfig is not aware of them):
>
> ip addr show
>
> You'll see there the notion of a primary IP and secondaries.  The system
> will initiate connection from the primary by default (unless you specify
> a route like the one above).
>
> HTH,
> Jorge
>
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