[lvs-users] DR : real server unable to reach VIP

[support at remsnet.de]

Dear Florent,

> 
> I'm using LVS with keepalived on Debian Wheezy.
> 
> I have 3 Real Servers:
> 10.111.17.170
> 10.111.17.171
> 10.111.17.172
> 
> And One VIP:
> 10.111.17.202
> 
> My service is running on port 3306.
>

OK .. looks  like an Mysql-NDB or MariaDB-Galea Cluster...

 
> VIP is not configured on RS (because I had others problems), so I use
> the iptables strategy on RS : iptables -t nat -A PREROUTING -p tcp -d
> 10.111.17.202 -j REDIRECT

you configured  NAT - but expected funtions of DR - and from that mixed up.

if you want LVS-NAT , then the realservers must BEHIND the LVS LoadBalancer at an second network connected to the LB1/LB1 in LVS-NAT Mode.


See LVS  docus : 
- http://www.austintek.com/LVS/LVS-HOWTO/mini-HOWTO/LVS-mini-HOWTO.html#example_LVS-NAT
- http://www.austintek.com/LVS/LVS-HOWTO/mini-HOWTO/LVS-mini-HOWTO.html#example_lvs_dr

see keepalive docu 
- http://www.hbyconsultancy.com/blog/two-nodes-load-balance-and-failover-with-keepalived-and-ubuntu-server-10-04-x64.html


Hope this helps.

--
Mit freundlichen Grüßen / Best Regards

Horst Venzke ; PGP NET : 1024G/082F2E6D ;  http://www.remsnet.de - 1995 - 2015 -  20 Jahre Linux/Unix Support.

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> Gesendet: Mittwoch, 20. Mai 2015 um 11:25 Uhr
> Von: "Florent B" <florent at coppint.com>
> An: lvs-users at linuxvirtualserver.org
> Betreff: [lvs-users] DR : real server unable to reach VIP
>
> Hi everyone,
> 
> I'm using LVS with keepalived on Debian Wheezy.
> 
> I have 3 Real Servers:
> 10.111.17.170
> 10.111.17.171
> 10.111.17.172
> 
> And One VIP:
> 10.111.17.202
> 
> My service is running on port 3306.
> 
> VIP is not configured on RS (because I had others problems), so I use
> the iptables strategy on RS : iptables -t nat -A PREROUTING -p tcp -d
> 10.111.17.202 -j REDIRECT
> 
> LVS is configured to send all connections to VIP in priority on
> 10.111.17.170 if it's alive.
> 
> My problem is that I can't connect to VIP:3306 from this real server !
> 
> Packets are sent, received by LVS but it seems to ignore them when
> source mac address is the same as (computed) destination mac address.
> 
> I really need to go through LVS and not REDIRECT OUTPUT packets on each RS.
> 
> Has anyone an idea of what's wrong with my setup and to fix it ?
> 
> Thank you a lot.
> 
> Florent
> 
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> http://www.linuxvirtualserver.org/
> 
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