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On Sun, Sep 19, 2010 at 04:59:44PM +0200, Tomasz Chmielewski wrote:
> Is it possible to load balance queries to localhost?
>
> Say, I have two servers - I'd like them to be both directors and realservers.
>
>
> Application connecting to localhost:1111 should be connected to either one or
> the other server. Despite many tries, I'm not able to achieve this.
>
> I had partial success with LVS-NAT rules:
>
> -A -t 127.0.0.1:1111 -s lc
> -a -t 127.0.0.1:1111 -r 10.0.0.10:1111 -m -w 1 # same server as localhost,
> works
> -a -t 127.0.0.1:1111 -r 10.0.0.20:1111 -m -w 1 # remote server
>
>
> Where the remote realserver receives the packet:
>
> 16:54:18.078365 IP (tos 0x10, ttl 64, id 52411, offset 0, flags [DF], proto
> TCP (6), length 60) 127.0.0.1.50427 > 10.0.0.20.1111: S, cksum 0xc03d
> (correct), 1282046761:1282046761(0) win 32792 <mss 16396,sackOK,timestamp
> 178066 0,nop,wscale 7>
>
>
> But I guess it's confused about what to do with it, since it appears to come
> from 127.0.0.1.
Yes, I think that is is confused because it comes from 127.0.0.1.
You need to make sure that the source address of that the client
(application) uses is one that the real-server can route to.
Typically the primary IP address on eth0.
If you can't set the application up to use a different source address
directly, then you may be better off to use a 10.0.0.x address as
the VIP (instead of 127.0.0.1).
Alternatively you may have some luck using the dnat feature
which will be introduced in 2.6.35.
http://www.spinics.net/lists/netdev/msg135919.html
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