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Hello,
I believe the LVS routers require a real IP so they can monitor the
real servers and to also send over the request from the client.
For example in TUN mode the LVS router sends the request from the client
in an encapsulated packet to the real server from it self. So it needs a
real IP address in order to do this.
You can add multiple VIPS to a single LVS cluster, so you are not
burning 3 IP's for each instance if that helps.
10.249.16.130 - lvs01
10.249.16.131 - lvs02
10.249.16.132 - shared service VIP
10.249.16.133 - shared service VIP
10.249.16.134 - shared service VIP
10.249.16.135 - shared service VIP
10.249.16.136 - shared service VIP
10.249.16.140 - real server
Michael
James Yale wrote:
> Joseph Mack NA3T wrote:
>> On Thu, 30 Apr 2009, James Yale wrote:
>>
>>
>>> On the other networks
>>>
>> what is "other"
>>
>>
>>> each load balancer has had an IP address, aswell
>>> as the shared VIP and everything has worked as expected, however now
>>> addresses are at higher contention I've tried to just configure the LVS
>>> boxes to only have the VIP on the new network (via haresources).
>>>
>> what is the "new" network?
>>
>> there's only one place you can have the VIP on a realserver.
>> Your last sentence indicates that you have a choice of where
>> to put it.
>>
>> Joe
>>
>>
> Sorry, should have been clearer with how I referred to the shared IP.
>
> If I've got a single network I would setup the load balancers/real
> servers as follows:
>
> 192.168.0.0/24:
>
> 192.168.0.5 - lvs01
> 192.168.0.6 - lvs02
> 192.168.0.10 - shared service VIP (via haresources)
> 192.168.0.15 - real server
>
> So I need to use 3 IP addresses, 2 for the load balancers and one for
> the VIP the load balancers present.
>
> I have several additional networks on which I want to provide the load
> balanced service, but one is a /28 so only provides 14 usable addresses.
> Is it required to have an IP for each load balancer on that network
> aswell as the service VIP, or can I just use the VIP on the networks eg:
>
> 10.249.16.128/28 (small network)
>
> 10.249.16.130 - lvs01
> 10.249.16.131 - lvs02
> 10.249.16.132 - shared service VIP
> 10.249.16.133 - real server
>
> Or for less IP use the load balancers don't have additional interfaces
> on the network, use the VIP to talk to the real servers:
>
> 10.249.16.132 - shared service VIP
> 10.249.16.133 - real server
>
> The second setup doesn't seem to work, I'm unsure why not (ARP issue),
> but I'm pursuing this because it saves 2/3 of the IP requirement on the
> small network.
>
>
> Thanks,
>
> James
>
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