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Hi this link m using to configure can u pls tell what shud my gateway as
per my network
http://www.centos.org/docs/4/4.5/SAC_Virtual_Server_Administration/s1-piranha-globalset-VSA.html
On Thu, Mar 29, 2012 at 5:25 PM, Enno Gröper <enno+lvs@xxxxxxxxxxxxxxxxx>wrote:
> Hi,
>
> Am 29.03.2012 12:54, schrieb Reet Vyas:
> > thanks for replying. my network is as follows:
> >
> > lvs has two nic etho and eth1 and my local is connect to eth1 and
> > external to eth0
> >
> > eth0 : has external ip cause we are working for client and eth1 has
> > 192.168.3.0 n/w.
> >
> > etho:122:166:133.xxx eth0:1 :122.166.133. xxx
> >
> > eth 1:192.168.3.xxx eth1:1 192.168.3.xxx
> Okay. And how are you testing your setup? Which IP does the client have?
>
> > As you said no iptable rule why so
> Why do you think, you need an iptable rule?
> LVS-NAT is explained in [1]:
> > When a user accesses the service provided by the server cluster, the
> > request packet destined for virtual IP address (the external IP
> > address for the load balancer) arrives at the load balancer. The load
> > balancer examines the packet's destination address and port number.
> > If they are matched for a virtual server service according to the
> > virtual server rule table, a real server is chosen from the cluster
> > by a scheduling algorithm, and the connection is added into the hash
> > table which record the established connection. Then, the destination
> > address and the port of the packet are rewritten to those of the
> > chosen server, and the packet is forwarded to the server. When the
> > incoming packet belongs to this connection and the chosen server can
> > be found in the hash table, the packet will be rewritten and
> > forwarded to the chosen server. When the reply packets come back, the
> > load balancer rewrites the source address and port of the packets to
> > those of the virtual service. After the connection terminates or
> > timeouts, the connection record will be removed in the hash table.
> As you can see, all packet rewriting is done by LVS itself without the
> need of iptables.
> All you have to do is make sure the real servers are sending their
> replies through the LVS node. That's why we make it their default gateway.
> Of course I don't know if you have any iptables rules already in place,
> that make your setup stop working.
>
>
> > and why gateway as eth1 instead of eth1:1 .it is mentioned in
> > documentation use VIP eth1:1 as gateway for real servers. pls m
> > confused .Can u pls explain??
> Which part of the documentation exactly? Do you have a link?
> I see a definition problem here.
> VIP could stand for
> * the IP the LVS (Linux VIRTUAL Server) is presenting to the outside
> world (the IP of the big virtual Server, that in reality consists of
> your loadbalancer and some real nodes)
> * an additional flexible IP on the LVS node (additional to the "real" IP
> of the network interface (eth0 vs. eth0:1) )
>
> I was talking about the latter. For LVS to work it doesn't matter which
> IP of your LVS node you use (eth1 or eth1:1), as long as you configure
> it in a consistent way.
> If you only have a single LVS node (no failover cluster), virtual
> (additional) IPs on your LVS node shouldn't be necessary.
> You can use the IPs the LVS node already has on each interface.
> But it shouldn't be a problem to use the VIPs.
>
> [1] http://www.linuxvirtualserver.org/VS-NAT.html
>
>
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