Re: [lvs-users] ip_vs_send_async error

[Simon Horman <horms@xxxxxxxxxxxx>]

On Mon, Dec 14, 2009 at 11:16:44AM +0200, Aleksey Chudov wrote:
> Hello!
> 
> Finally we have place our LVS in production. We doesn't find any errors in
> test scheme. But there is problem in production environment. We are using
> connection sync and every second above 100 error messages comes to
> /var/log/messages on LVS Master server.
> 
> Dec 14 12:06:42 lvs-master kernel: IPVS: ip_vs_send_async error
> Dec 14 12:06:42 lvs-master kernel: IPVS: ip_vs_send_async error
> Dec 14 12:06:42 lvs-master kernel: IPVS: ip_vs_send_async error
> Dec 14 12:06:42 lvs-master kernel: IPVS: ip_vs_send_async error
> 
> I try to start connection sync daemon different ways:
> 
> 1)
> /sbin/ipvsadm --start-daemon=master --mcast-interface=eth0 --syncid=1
> /sbin/ipvsadm --start-daemon=backup --mcast-interface=eth0 --syncid=1
> 
> 2)
> /sbin/ipvsadm --start-daemon=master
> /sbin/ipvsadm --start-daemon=backup
> 
> 3)
> /sbin/ipvsadm --start-daemon=master --mcast-interface=eth1
> /sbin/ipvsadm --start-daemon=backup --mcast-interface=eth1
> 
> But every time get the same errors. I can see connections from lvs master on
> lvs backup so connection sync is work.
> 
> My kernel version is 2.6.31.2.
> My ipvsadm version is ipvsadm-1.24.

At a wild guess I'd say that there is some issue with the
network configuration on your production machine such
that the kernel can't send packets to the multicast group
224.0.0.81. Perhaps a missing route?


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