Start by creating a file in the root of your WordPress install (on level with wp-settings.php) called .maintenance
This file should contain the following:
(Note that this code allows admin users to login an access the blog/website.)
<?php
function is_user_logged_in() {
$loggedin = false;
foreach ( (array) $_COOKIE as $cookie => $value ) {
if ( stristr($cookie, 'wordpress_logged_in_') )
$loggedin = true;
}
return $loggedin;
}
if ( ! stristr($_SERVER['REQUEST_URI'], '/wp-admin') && ! stristr($_SERVER['REQUEST_URI'], '/wp-login.php') && ! is_user_logged_in() )
$upgrading = time();
?>
If you want to specifiy a set time for the maintenance mode to display, you can replace the line:
<?php $upgrading = time(); ?>
With this code which has a unix timestamp:
<?php $upgrading = 1234567890; ?>
Read more about unix timestamps here:
http://www.onlineconversion.com/unix_time.htm
After wp-settings.php determines whether or not to put the blog into maintenance mode it checks to see if there is a file titled maintenance.php located in WP_CONTENT_DIR which is by default wp-content/.
Simply create a file at wp-content/maintenance.php containing the code you want to display the for the maintenance page. Below is a sample of code based off of the default maintenance page.
<?php
/* Tell search engines that the site is temporarily unavilable */
$protocol = $_SERVER["SERVER_PROTOCOL"];
if ( 'HTTP/1.1' != $protocol && 'HTTP/1.0' != $protocol ) $protocol = 'HTTP/1.0';
header( "$protocol 503 Service Unavailable", true, 503 );
header( 'Content-Type: text/html; charset=utf-8' );
header( 'Retry-After: 600' );
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>RiAus - Maintenance</title>
<style type="text/css">
<!--
body {
margin-left: 0px;
margin-top: 0px;
margin-right: 0px;
margin-bottom: 0px;
}
-->
</style></head>
<body>
<div align="center"><img src="http://www.riaus.org.au/images/website-maintenance.png" alt="RiAus" width="700" height="380" border="0" usemap="#Map" />
</div><!-- end #content-outer -->
<?php
/* This passes control back to the wordpress upgrade routine */
die();
/* Don't change this */
?>
Matt Sivel wrote an awesome 3 part blog on maintenance mode in WordPress:
http://sivel.net/2009/06/wordpress-maintenance-mode-without-a-plugin/
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