On Jan 18, 2007, at 5:35 PM, Rob Mueller wrote:
Attached is our operation group's notes on the subject. It makes
reference to the tool we use to manage the OS of the machines
(radmind), but it should be pretty clear what they are talking about
without any radmind knowledge.
As an FYI, we have a similar procedure to this, the main
differences are:
1. We don't change the DNS. Instead we give each machine a primary
IP address, but we also create IP addresses for "cyrusXmaster" and
"cyrusXreplica" names(where X is numbers for each machine). When we
swap roles, we rebind the different IPs to the particular machines
and send ARPs to clear the router table, rather than changing the
DNS. This means you can always access the master as "cyrusXmaster"
from every machine without having to worry about DNS getting out of
sync.
2. Every machine has cyrus-master.conf, cyrus-replica.conf, imapd-
master.conf and imapd-replica.conf. We just symlink cyrus.conf and
imapd.conf to the appropriate file depending on what mode the
machine is currently in
Do you have separate IP addresses for each instance of cyrus on the
machine as well, or just the machine itself? If just the machine,
what 'names' does the front-end know the back-end instances by?
FWIW we use IP names for our 17 back-end UW mailstores...
Thanks.
-nik
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