I have created the following smtp load balancing setup
lb1 (keepalived server) host mx... ip .249
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host mx1... ip .244 (postfix smtp) host mx2... ip .245 (postfix smtp)
On each m1... and mx2... mail servers I added
interfaceces
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auto lo:(depending on machine 244 or 245)
iface lo:(depending on machine 244 or 245) or inet static
address 192.168.0.(depending on machine 244 or 245)
netmask 255.255.255.255
broadcast 192.168.0.255
pre-up echo 1 >/proc/sys/net/ipv4/conf/all/arp_ignore; echo 2
>/proc/sys/net/ipv4/conf/all/arp_announce
/etc/sysctl.conf
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net.ipv6.conf.all.disable_ipv6 = 1
/etc/postfix/main.cf
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inet_interfaces = 127.0.0.1, 192.168.0.(depending on machine 244 or 245)
smtp_bind_address = 192.168.0.(depending on machine 244 or 245)
inet_protocols = ipv4
smtp_address_preference = ipv4
so that when I do telnet mx... 25, I should connect to the next
available server either .244 or .245.
I have confirmed that lb1 keepalived server is working. The problem
is mx1... and mx2... are not accepting connection.
There is one other item that supposedly I should have added. But
postfix doesn't like when I add this line to master.cf.
192.168.0.249:smtp inet n - n - - smtpd
-o myhostname=mx...
-o smtp_helo_name=mx...
