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Simon,
Thanks for the reply.
What's the best way to change the config (from rr to lc) with minimal
impact to the service?
Yan
2009/9/27, Simon Horman <horms@xxxxxxxxxxxx>:
> 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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> http://www.linuxvirtualserver.org/
>
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