* V. T. Mueller <vtmue@???> [20011105 16:40]: writing on the subject 'Re: [Exim] Backup Mail Server'
| On Mon, 5 Nov 2001, Odhiambo Washington wrote:
| > | You maybe have to think over a few scripts to dynamically switch your
| > | POP/IMAP/whatever-server´s IP for example.
| > That would mean that I start delivering locally on the backup server???
|
| Probably not. It depends where your users are. Do they access mail locally
| on your primary machine or do they access mail remotely via POP or imap?
The only person who accesses mail locally is me. The rest use POP3/IMAP
access.
| If the latter is the case, you have the chance to switch over the IP
| and/or the hostname of your POP/IMAP server to the fallback MX. Users
| then can still access new email until the primary host gets available
| again.
Hmm, I don't understand how that would happen when no deliveries are done
on the fallback MX. It doesn't have users accounts/mailboxes on it. In fact
it's my hope that it will just hold the mail in the queue until the main
server comes up, no?
| The setup starts to become interesting as soon if you implement a third
| machine to hold copies for later synchronization.
Someone is doing this already?? I have 3 servers and if that is a way with
some HOWTO then I'd be willing to give it a try.
| > | You can also set up a general HA system and put a few other services
| > | on it so it´s worth the time and money.
| > Okay, I must admit that I'm floating on this one. What is a HA system?
|
| I´m sorry. "HA" stands for "High Availability". Generally achieved by a
| certain degree of redundancy and a varying level of clever software.
| Sophisticated systems such as HP9000 also provide certain features on the
| firmware/hardware level. A decent HA system can, however, also built on
| two cheap PCs, an open-source HA suite or simply by using a handful of
| scripts to manipulate DNS records and rc scripts.
You have some pointers on the web that I can look at???
TIA
-Wash
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