Small Redundant web/mail setup

[Andrea Venturoli]

Ian Lord wrote:
> Hi,
> 
> I need to setup a high-availability setup for mail/web setup
> ...
>         1 Server holding all the websites data and mail messages. It 
> would serve these files via nfs to the application servers.
>         It would also run mysql
> 
>         A second server Also sharing it's content via nfs, replicating 
> it's data though rsync each ?? minutes. The mysql would run as a slave 
> of the    primary
> 
> Application Servers:
>         Both servers would be running apache, php, sendmail and posfix 
> and would serve content from the share nfs drive.
> 
> 1- Is this a viable solution, I mean by that, Is it Like this big ISP 
> are set up ?

I don't know any of the answers for sure, but I'd bet they are both 'no'.



> 2- Is there a better way to replicate data than RSYNC (without going to 
> san of expensive hardware) ? If not, is there a hotsync feature (I mean 
> by that as soon as server A modify something, server B knows and 
> replicate)?

I guess so.
First of all, I don't really understand the need to have four server, 
unless there is some point which you didn't tell us.
Apart from that, I guess it would be a lot better to try and sync at the 
application level.
MySQL should support this and I bet you can find something alike on the 
  IMAP side (cyrus has that support, but I don't know how stable that is).
That leaves you with file system replication only for web sites, but 
that should be ok as long as it's mostly read-only data.

  bye
	av.