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Meghanand Acharekar wrote:
> Revisiting my setup
>
> Hi,
>
> I having following setup for LVS-DR cluster.
> Having 3 machine ( 1 director & 2 real servers) with following settings
>
> Director
>
> IP eth0 : 192.168.0.10 ( Netmask : 255.255.255.224 )
> VIP eth0:1 : 192.168.0.110 ( Netmask : 255.255.255.224 )
>
I have put a /32 for the VIP, not a /27.
And for the real IP, a /27 isn't big enough to reach .110 from .10
> Realserver 1
>
> IP eth0 : 192.168.0.11 ( Netmask : 255.255.255.224 )
> lo:0 : 192.168.0.110 ( Netmask : 255.255.255.255 )
>
> Realserver 2
> IP eth0 : 192.168.0.12 ( Netmask : 255.255.255.224 )
> lo:0 : 192.168.0.110 ( Netmask : 255.255.255.255 )
>
> * Enabled packet forwarding on Director
>
> net.ipv4.ip_forward = 1
>
>
> on both the real server I have disabled arp by making following entries in
> /etc/sysctl.conf
> ( Kindly let me know if anything is wrong here )
>
>
> net.ipv4.conf.eth0.arp_ignore = 1
> net.ipv4.conf.eth0.arp_announce = 2
> net.ipv4.conf.all.arp_ignore = 1
> net.ipv4.conf.all.arp_announce = 2
>
Did you run sysctl -p (or rebooted the real servers since) ?
> When I do a telnet to port 25 to VIP.
> It did not get any response
>
> [root@client1 ~]# telnet 192.168.0.110 25
> Trying 192.168.0.110...
>
> But I observed that request is reaching Director but not getting passed to
> realservers from there.
> Checked following output
>
> [root@localhost ~]# ipvsadm -L -n --stats
> IP Virtual Server version 1.2.1 (size=4096)
> Prot LocalAddress:Port Conns InPkts OutPkts InBytes
> OutBytes
> -> RemoteAddress:Port
> TCP 192.168.0.110:25 36 56 0 3360
> 0
> -> 192.168.0.11:25 22 33 0
> 1980 0
> -> 192.168.0.12:25 14 23 0
> 1380 0
>
> Not able to find out whats wrong :-(
>
> I did LVS setup several time using LVS-NAT, but now facing lots of issues
> with LVS-DR
I'm pretty sure that you problem is linked with the network mask mismatch.
You can also tcpdump on the various machines to find out if packet
arrive on the real servers or not.
--
Thomas
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