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[lvs-users] Having both gate and masq realservers for one virtual service - possible?

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gwaugh at scu

Oct 24, 2007, 12:28 AM

Post #1 of 3 (315 views)
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[lvs-users] Having both gate and masq realservers for one virtual service - possible?

Hi all,

I'm wondering if it is possible to have both LVS-NAT-style and
LVS-DR-style realservers running for one virtual service (at the same time)?

The reason I ask is that I'm in the process of implementing a new web
system (primarily port 80). My existing LVS system uses LVS-NAT, but I
want to move to LVS-DR. I have the LVS-DR realservers working fine using
a different virtual IP but using the same web content and talking to the
same databases (the LVS-DR realservers have an IP in the LVS-NAT private
network, so can NFS-mount the shared web document root).

I'd really like to run my two existing LVS-NAT realservers and my two
new LVS-DR realservers simultaneously for a while. The fact that you
specify whether to use 'masq' (NAT) or 'gate' (DR) in ipvsadm's "add a
realserver" command (i.e. 'ipvsadm -a ...') makes me think it might be
possible... I'd test it myself, but I'd have to either schedule an
outage or build a dev system, so I wonder if anyone knows?

Thanks,
Guy.

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jmack at wm7d

Oct 24, 2007, 6:43 AM

Post #2 of 3 (307 views)
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Re: [lvs-users] Having both gate and masq realservers for one virtual service - possible? [In reply to]

On Wed, 24 Oct 2007, Guy Waugh wrote:

> Hi all,
>
> I'm wondering if it is possible to have both LVS-NAT-style and
> LVS-DR-style realservers running for one virtual service (at the same time)?

no

> The reason I ask is that I'm in the process of implementing a new web
> system (primarily port 80). My existing LVS system uses LVS-NAT, but I
> want to move to LVS-DR. I have the LVS-DR realservers working fine using
> a different virtual IP but using the same web content and talking to the
> same databases (the LVS-DR realservers have an IP in the LVS-NAT private
> network, so can NFS-mount the shared web document root).
>
> I'd really like to run my two existing LVS-NAT realservers and my two
> new LVS-DR realservers simultaneously for a while.

There's got to be other ways of doing this

eg (mad scheme #1)

have two VIPs, one for LVS-NAT and one for LVS-DR and have
two entries for the domainname in DNS?

Joe

--
Joseph Mack NA3T EME(B,D), FM05lw North Carolina
jmack (at) wm7d (dot) net - azimuthal equidistant map
generator at http://www.wm7d.net/azproj.shtml
Homepage http://www.austintek.com/ It's GNU/Linux!

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gwaugh at scu

Oct 24, 2007, 6:22 PM

Post #3 of 3 (305 views)
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Re: [lvs-users] Having both gate and masq realservers for one virtual service - possible? [In reply to]

Joseph Mack NA3T wrote:
> On Wed, 24 Oct 2007, Guy Waugh wrote:
>
>
>> Hi all,
>>
>> I'm wondering if it is possible to have both LVS-NAT-style and
>> LVS-DR-style realservers running for one virtual service (at the same time)?
>>
>
> no
>
>
>> The reason I ask is that I'm in the process of implementing a new web
>> system (primarily port 80). My existing LVS system uses LVS-NAT, but I
>> want to move to LVS-DR. I have the LVS-DR realservers working fine using
>> a different virtual IP but using the same web content and talking to the
>> same databases (the LVS-DR realservers have an IP in the LVS-NAT private
>> network, so can NFS-mount the shared web document root).
>>
>> I'd really like to run my two existing LVS-NAT realservers and my two
>> new LVS-DR realservers simultaneously for a while.
>>
>
> There's got to be other ways of doing this
>
> eg (mad scheme #1)
>
> have two VIPs, one for LVS-NAT and one for LVS-DR and have
> two entries for the domainname in DNS?
>
> Joe
>
Thanks for your thoughts Joe... I originally set up the new servers as
LVS-NAT servers before I changed them to LVS-DR, so I'll revert them to
LVS-NAT for testing purposes and change them back to LVS-DR later on.

Cheers,
Guy.

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