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On Sun, Sep 27, 2009 at 02:56:53AM +0800, Liu Yan wrote:
> hi List,
> I have a 2-server heartbeat plus ldirectord setup to load balance my nginx
> services. I have the following setup in my specific case:
>
> -- both servers are used as node of heartbeat, and the real server (nginx)
> -- have 2 IPs bound to eth0 and eth0:0 (I have to HA these 2 IPs)
> -- lo:0 and lo:1 are used to stored the VIPs when the node is in standby
> mode
> -- using direct routing in the ldirectord
>
> I added the following section to /etc/ha.d/haresources so all the two IPs
> can be took over by the standby machine when I shutdown the active one, so
> this is basically working:
> s1 \
> ldirectord::ldirectord.cf \
> LVSSyncDaemonSwap::master \
> IPaddr2::VIP1/26/eth0/x.x.x.x \
> IPaddr2::VIP2/28/eth0:0/x.x.x.x
>
> When I use ipvsadm, I see something like this:
> Prot LocalAddress:Port Scheduler Flags
> -> RemoteAddress:Port Forward Weight ActiveConn InActConn
> TCP VIP1:http rr
> -> RIP1-2:http Route 1 174 0
> -> RIP1-1:http Local 1 2 13
> TCP VIP2:http rr
> -> RIP2-2:http Route 1 712 0
> -> RIP2-1:http Local 1 20 45
>
> My questions are:
> 1) Are RIP1-1 and RIP2-1 being recognized as "Local" correct? RIP1-1 and
> RIP2-1 are the IPs of the active node.
Yes.
> 2) Why the remote (Route) server is taking much more requests than the local
> one?
I suspect its an anomaly of the way that round-robin (rr) deals with
the pattern of connections you are receiving. Can you try least connected
(lc) instead?
> 3) Why the local server has a large number of "InActConn"?
>
> I tried to shutdown the nginx on the remote server and saw the RIP1-2 and
> RIP2-2 being removed from the above table correctly, and my service is still
> up, which means the RIP1-1 and RIP2-1 are serving properly.
This could indicate a time-out issue. Or it could just indicate that RIP1-1
and RIP2-1 handled some connections recently. It probably relates to
question 2), so could you try lc and see if that improves the situation?
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