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> Then the problem came when I want to try next level: I
> want to setup LVS for ftp. After searching so long in
> the documentation, I found that there's no example
> about setting ftp with LVS-NAT. I've tried to figure
> out setting up LVS-NAT for ftp. But I got nothing.
You have to deal with dynamic port negociation in FTP. I think I've read
something about this problem somewhere. You should refer to the documentation
of iptables, see what is written about ip_nat_ftp and ip_conntrack_ftp.
> So, because those examples about ftp are all using
> LVS-DR, here I am, trying to have LVS-DR.
Good.
> I have questions about LVS-DR:
>
> 1. Is it OK that the director also acts as the
> gateway? From my previous setup with LVS-NAT, I'm left
> with the director acted as the gateway for the
> realservers. And for some reasons, I think I'll keep
> using it as the gateway.
In the FTP connections, the problem is the gateway. Whatever you use for LVS
packets routing, you will have to deal with the ftp DATA connection. I think
someone on this list would give you a more detailed information.
> 2. I don't understand what this command does:
>
> /sbin/ifconfig lo:110 192.168.1.110 broadcast
> 192.168.1.110 netmask 255.255.255.255
You declare the VIP on all the real server. This is the IP you will have to
hide (with noarp or the hidden patch).
> I found it in LVS-Mini-HOWTO. It's said that It's
> supposed to be done on the realservers. I don't
> understand why it points itself as broadcast address,
> and why we use netmask 255.255.255.255
>
> Would anyone please give me an enlightment? :)
I will try. When a packet arrives on the real server, it will have the VIP as
destination, routed through the RIP of the real server. You will have to route
this packet to the VIP. This is what this ifconfig line do. It declares a
subnet (of one IP, say, a /32) so that the packets for the VIP will be routed
to the specified interface. You should not declare a biggest subnet (/24 or
whatever) or you will have problems with the outgoing packets.
François.
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