WordPress可以一次安装，多处使用，Magento当然更有理由这么做了。
Magento强大的功能之一就是run multi websites，Magento内置了多站点运行的功能。我援引从WordPress安装管理探索出的经验，觉得即使Magento内置multi websites功能，各站点还是不要使用同一个document root为好，还是以一主多副软连接的方式为宜。
只是，我还是没有找到在后台隔离各站点的办法（假设它们由不同的web manager来经营）。我也无法控制上传目录，所有上传得文件都是存放在主域名的document root/{magento installatin path}/media下。
好在magento子目录安装，根目录显示还是做得到的。如将magento放置在document root/magento下，但前台url不出现magento，具体的做法是
1. 把index.php和.htaccess移到document root，其他文件都放置在document root/magento子目录
2. 把index.php修改成
<?php
/**
* Magento
*
* NOTICE OF LICENSE
*
* This source file is subject to the Open Software License (OSL 3.0)
* that is bundled with this package in the file LICENSE.txt.
* It is also available through the world-wide-web at this URL:
* http://opensource.org/licenses/osl-3.0.php
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to license@magentocommerce.com so we can send you a copy immediately.
*
* DISCLAIMER
*
* Do not edit or add to this file if you wish to upgrade Magento to newer
* versions in the future. If you wish to customize Magento for your
* needs please refer to http://www.magentocommerce.com for more information.
*
* @category Mage
* @package Mage
* @copyright Copyright (c) 2008 Irubin Consulting Inc. DBA Varien (http://www.varien.com)
* @license http://opensource.org/licenses/osl-3.0.php Open Software License (OSL 3.0)
*/
if (version_compare(phpversion(), ‘5.2.0’, ‘<‘)===true) {
echo ‘<div style=”font:12px/1.35em arial, helvetica, sans-serif;”><div style=”margin:0 0 25px 0; border-bottom:1px solid #ccc;”><h3 style=”margin:0; font-size:1.7em; font-weight:normal; text-transform:none; text-align:left; color:#2f2f2f;”>Whoops, it looks like you have an invalid PHP version.</h3></div><p>Magento supports PHP 5.2.0 or newer. <a href=”http://www.magentocommerce.com/install” target=””>Find out</a> how to install</a> Magento using PHP-CGI as a work-around.</p></div>’;
exit;
}
$mageFilename = ‘magento/app/Mage.php’;
if (!file_exists($mageFilename)) {
if (is_dir(‘downloader’)) {
header(“Location: downloader”);
} else {
echo $mageFilename.” was not found”;
}
exit;
}
require_once $mageFilename;
#Varien_Profiler::enable();
#Mage::setIsDeveloperMode(true);
#ini_set(‘display_errors’, 1);
umask(0);
Mage::run(‘default’);
3. 把.htaccess修改成：
############################################
## uncomment these lines for CGI mode
## make sure to specify the correct cgi php binary file name
## it might be /cgi-bin/php-cgi
# Action php5-cgi /cgi-bin/php5-cgi
# AddHandler php5-cgi .php
############################################
## GoDaddy specific options
# Options -MultiViews
## you might also need to add this line to php.ini
## cgi.fix_pathinfo = 1
## if it still doesn’t work, rename php.ini to php5.ini
############################################
## this line is specific for 1and1 hosting
#AddType x-mapp-php5 .php
#AddHandler x-mapp-php5 .php
############################################
## default index file
DirectoryIndex index.php
<IfModule mod_php5.c>
############################################
## adjust memory limit
# php_value memory_limit 64M
php_value memory_limit 128M
php_value max_execution_time 18000
############################################
## disable magic quotes for php request vars
php_flag magic_quotes_gpc off
############################################
## disable automatic session start
## before autoload was initialized
php_flag session.auto_start off
############################################
## enable resulting html compression
#php_flag zlib.output_compression on
###########################################
# disable user agent verification to not break multiple image upload
php_flag suhosin.session.cryptua off
###########################################
# turn off compatibility with PHP4 when dealing with objects
php_flag zend.ze1_compatibility_mode Off
</IfModule>
<IfModule mod_security.c>
###########################################
# disable POST processing to not break multiple image upload
SecFilterEngine Off
SecFilterScanPOST Off
</IfModule>
<IfModule mod_deflate.c>
############################################
## enable apache served files compression
## http://developer.yahoo.com/performance/rules.html#gzip
# Insert filter
#SetOutputFilter DEFLATE
# Netscape 4.x has some problems…
#BrowserMatch ^Mozilla/4 gzip-only-text/html
# Netscape 4.06-4.08 have some more problems
#BrowserMatch ^Mozilla/4\.0[678] no-gzip
# MSIE masquerades as Netscape, but it is fine
#BrowserMatch \bMSIE !no-gzip !gzip-only-text/html
# Don’t compress images
#SetEnvIfNoCase Request_URI \.(?:gif|jpe?g|png)$ no-gzip dont-vary
# Make sure proxies don’t deliver the wrong content
#Header append Vary User-Agent env=!dont-vary
</IfModule>
<IfModule mod_ssl.c>
############################################
## make HTTPS env vars available for CGI mode
SSLOptions StdEnvVars
</IfModule>
<IfModule mod_rewrite.c>
############################################
## enable rewrites
Options +FollowSymLinks
RewriteEngine on
############################################
## you can put here your magento root folder
## path relative to web root
#RewriteBase /magento/
############################################
## workaround for HTTP authorization
## in CGI environment
RewriteRule .* – [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]
############################################
#This is my creation for installing magento under a subfolder.
############################################
RewriteCond %{REQUEST_URI} ^/(media|skin|js)/
RewriteRule (.*) magento/$1 [l]
############################################
## always send 404 on missing files in these folders
RewriteCond %{REQUEST_URI} !^/(media|skin|js)/
############################################
## never rewrite for existing files, directories and links
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-l
############################################
## rewrite everything else to index.php
RewriteRule .* index.php [L]
</IfModule>
############################################
## Prevent character encoding issues from server overrides
## If you still have problems, use the second line instead
AddDefaultCharset Off
#AddDefaultCharset UTF-8
<IfModule mod_expires.c>
############################################
## Add default Expires header
## http://developer.yahoo.com/performance/rules.html#expires
ExpiresDefault “access plus 1 year”
</IfModule>
############################################
## By default allow all access
Order allow,deny
Allow from all
############################################
## If running in cluster environment, uncomment this
## http://developer.yahoo.com/performance/rules.html#etags
#FileETag none