I have some mail servers running postfix on FreeBSD that I am trying to
configure to work with a load balancer. I need to configure the lo0
loopback interface to use the IP address the load balancer will be handling
for this group of mail servers. Also I need to turn off ARP on the
interface to keep the servers being load balanced from telling the switch to
associate the balanced IP address with their own MAC addresses.
Currently I'm running the following command, and it seems to work well for
another set of postfix servers that use different postfix configurations:
ifconfig lo0 1.2.3.4 netmask 255.255.0.0 -arp up
(1.2.3.4 being whatever the IP address the load balancer is managing for the
group of servers)
The first group of servers I tried this on seemed to work fine, but when I
tried this on another server I started getting a large number of error
messages like the following:
Sep 29 10:45:38 {hostname} postfix/smtpd[39862]: warning: problem talking to
server 127.0.0.1:10023: Permission denied
It looks like postfix is attempting to communicate with postgrey running on
port 10023, but is unable to connect for some reason. The servers that I
have successfully setup to use load balancing aren't using postgrey, which
is probably why I haven't run into this connection issue yet with them.
I'm still fairly new to postfix, unix, and networking, so any help /
direction would be greatly appreciated.
- A.M.
