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Alison Smith wrote:
> Hi. My partner (Ravi) and I are setting up two separate linux clusters but
> we are having similar problems.
>
> For this posting, I will only talk about one, but we need help solving the
> problems for both :). Hopefully, it is the same problem and easily
> diagnosed by someone with experience.
>
> DR is being used.
>
> The kernel is 2.4.5, with the ipvs-0.9.1, and hidden-2.4.5-1 patches
> applied to it. Configure-0.8 was used to set this cluster up. Also, the
> value in
> /proc/sys/net/ipv4/conf/all/hidden is set to 1 for the real-servers and 0
> for the director.
>
> There is one director and 2 real-servers; set up in the following manner:
>
> director:
> VIP: arlx016
> DIP: 10.1.1.1
>
> real-servers:
> VIP: arlx043
> RIP: 10.1.1.2
>
> VIP: arlx044
> RIP: 10.1.1.3
>
> The symptoms of the problem are that when requests are sent the director
> never processes the packets (or at least tcpdump doesn't report them) and
> hence the scheduling algorithm is never called. The number of connections
> is not updated.
>
> After pinging the director VIP, the arp -a on the client reports:
>
> arlx016.austin.ibm.com (9.3.61.16) at 00:60:CF:20:5D:8F [ether] on eth0
>
> which is the MAC address of a realserver (10.1.1.2)
>
> pinging arlx016 from itself reports the following:
>
> [root@arlx016 /root]# arp -a
> ? (10.1.1.2) at 00:60:CF:20:5D:8F [ether] on eth1
> ? (10.1.1.3) at 00:60:CF:20:5D:9C [ether] on eth1
>
> So it seems that the real-servers are still responding to arp requests.
>
> Another interesting problem is that although the lvs_dr.conf file only
> mentions the service www and that is all that ipvsadm reports, all services
> are distributed to the real-servers.
>
> Any suggestions would be appreciated, please let me know if you need any
> more information.
I don't know about the hidden thing your doing, but the ipchains (or iptables
now) trick works great. Just send the real server the stuff for the VIP and
make it redirect it. No arp problem because only the director actually
responds to the VIP.
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