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Hi
Travis Melhiser wrote:
I'm pretty new to LVS and can't seem to find the right configuration or
the right documentation to get my environment set up.
I would like to have requests come to the LVS server on port 80 an then
have the LVS server forward these requests to the machines in the
cluster running the web servers on port 81.
Does anyone have an example of how to set this up?
It depends how you're configuring your LVS. If you're using keepalived,
ldirectord, or some other piece of automation then you'll simply need to
setup your virtual server VIP on port 80 and the realservers behind it
on port 81.
If you're doing your setup "by hand" using ipvsadm, then you'll do
something like the following (but see the note below):
ipvsadm -A -t $VIP:80
ipvsadm -a -t $VIP:80 -r $RIP:81 -m -w $WEIGHT
...and so on for your other virtual servers. Other options may apply,
and because it's fairly late I may have dropped a howler with the
others, but you get the idea I'm sure :)
Here's the note mentioned above: as far as I am aware, you can likely
only do this in an LVS NAT (masquerading) system. IN DR or TUN
(gatewaying or ipip encapsulation respectively), the replies go diretly
(in the majority of cases) from the realserver to the client, so if you
wanted to reply from a different port your TCP three-way handshake won't
work.
Hope that helps
Graeme
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