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I asked several days ago for advice about how to handle port translation
for lvs servers. Thanks for the help so far.
I have written a simple script to load the service table.
(The IP addresses have been obscurred)
My goal is to have 3 real servers all accepting requests for a web
service listening on a high port, 7777 in this example. Clients may
attempt to connect to a variety of ports at the VIP which will be
directed to real servers by wlc. I also want each real server to have
its own VIP, but the primary goal is to distribute load using the main
VIP.
#!/bin/sh
echo "
-A -t 123.456.789.202:80
-A -t 123.456.789.203:80
-A -t 123.456.789.204:80
-A -t 123.456.789.210:80 -s wlc
-A -t 123.456.789.210:443 -s wlc
-A -t 123.456.789.210:7777 -s wlc
-A -t 123.456.789.210:9999 -s wlc
-a -t 123.456.789.202:80 -r 172.16.240.202:7777 -m
-a -t 123.456.789.203:80 -r 172.16.240.203:7777 -m
-a -t 123.456.789.204:80 -r 172.16.240.204:7777 -m
-a -t 123.456.789.210:80 -r 172.16.240.202:7777 -m -w 2
-a -t 123.456.789.210:80 -r 172.16.240.203:7777 -m -w 2
-a -t 123.456.789.210:80 -r 172.16.240.204:7777 -m -w 2
-a -t 123.456.789.210:443 -r 172.16.240.202:7777 -m -w 2
-a -t 123.456.789.210:443 -r 172.16.240.203:7777 -m -w 2
-a -t 123.456.789.210:443 -r 172.16.240.204:7777 -m -w 2
-a -t 123.456.789.210:7777 -r 172.16.240.202:7777 -m -w 2
-a -t 123.456.789.210:7777 -r 172.16.240.203:7777 -m -w 2
-a -t 123.456.789.210:7777 -r 172.16.240.204:7777 -m -w 2
-a -t 123.456.789.210:9999 -r 172.16.240.202:7777 -m -w 2
-a -t 123.456.789.210:9999 -r 172.16.240.203:7777 -m -w 2
-a -t 123.456.789.210:9999 -r 172.16.240.204:7777 -m -w 2
" | ipvsadm -R
Now my question is:
How do I get the virtual interfaces created in order to handle the 3
additional VIP addresses? I do not see clearly how to do this in lvs.cf
and I suspect that building virtual interfaces by hand is not
sufficient. Somehow the virtual interface must be included in a lvs
table known to the kernel right?
I don't understand what is reading and parsing lvs.cf and where the
results are placed. Perhaps if I could gain this insight the rest would
become clear.
On Thu, 2004-03-04 at 16:07, Joseph Mack wrote:
> Francois JEANMOUGIN wrote:
>
> > Well, if you need to keep DR or Tun LVS, just use :
> >
> > /sbin/iptables -t nat -A PREROUTING -d VIP -p tcp -m tcp --dport 80 -j DNAT
> > --to-destination VIP:9999
> >
> > on the realserver. It works for me for tomcat standalone servers.
>
> does this rewrite the packets in the reverse direction too?
>
> Joe
--
Ryan Leathers <ryan.leathers@xxxxxxxxxxxxxxxxxxx>
Global Knowledge
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