On Fri, 24 Aug 2007, Matt Arnilo S. Baluyos (Mailing Lists) wrote:
Hello everyone,
Although we use CentOS primarily on our servers, this query is
actually more of a general networking question than something specific
to CentOS.
In the next week or so, we shall be migrating our in-house servers to
a data center. While we're doing that, we'd like to show a "Site down
for maintenance" message while the servers that hosts our websites (we
have around 15 sites hosted btw), are down.
So, how is this accomplished? While I can probably hack something on
our name servers, I'm sure there are people on this list that have
been doing this and could give some recommendations as to the best
practices for this type of task.
I would have DNS for all domains point to a web server that has the
following php page:
=========================================================================
<html>
<head>
<title>Maintenance</title>
</head>
<body bgcolor=white>
<font size=5><center>Maintenance</center>
<br>
<center>The server that hosts <? $_SERVER['HTTP_HOST'] ?> is currently
undergoing maintenance. <? $_SERVER['HTTP_HOST'] ?> will return to full
service as soon as possible.
</center>
</body>
</html>
=========================================================================
I would also add to your httpd.conf file:
=========================================================================
RewriteEngine on
RewriteRule !^/index\.php$ /index.php [NC,L]
RewriteRule !^/index\.php$ - [F]
=========================================================================
This makes it so that anyone who connects to any URL on any of your
websites will be told that the server they are connecting to is under
maintenance.
When you have the new server up and running, change DNS. Alternately you
could place this on a server in the new location, but change the
routing/NATing to temporarily deliver the addresses to the server hosting
this page. If you are using SSL certificates, you will need to have them
as well and create different virtualhosts, although they can all have the
same DocumentRoot and web page.
Hope this helps.
Barry
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