看这篇博客前请先查阅 apache2.2.6 + mongrel_cluster1.0.5负载均衡
一个台服务器开启两个httpd主进程，分别使用不同的配置文件，服务两个不同的网站。
具体步骤：
1. 从源码安装apache服务，安装路径： /usr/local/apache2.2.22
在/usr/local/apache2.2.22/conf 下创建两个配置文件httpd.conf和httpd2.conf。
httpd.conf:
ServerRoot "/usr/local/apache2.2.22"
Listen 127.0.0.1:80
LoadModule cache_module modules/mod_cache.so
LoadModule proxy_module modules/mod_proxy.so
LoadModule proxy_ftp_module modules/mod_proxy_ftp.so
LoadModule proxy_http_module modules/mod_proxy_http.so
LoadModule proxy_scgi_module modules/mod_proxy_scgi.so
LoadModule proxy_ajp_module modules/mod_proxy_ajp.so
LoadModule proxy_balancer_module modules/mod_proxy_balancer.so
LoadModule rewrite_module modules/mod_rewrite.so
<IfModule !mpm_netware_module>
<IfModule !mpm_winnt_module>
User daemon
Group daemon
</IfModule>
</IfModule>
ServerAdmin [email protected]
ServerName 127.0.0.1:80
#DocumentRoot "/usr/local/apache2.2.22/htdocs"
<Directory />
Options FollowSymLinks
AllowOverride None
Order deny,allow
Deny from all
</Directory>
<Directory "/usr/local/apache2.2.22/htdocs">
Options Indexes FollowSymLinks
AllowOverride None
Order allow,deny
Allow from all
</Directory>
<IfModule dir_module>
DirectoryIndex index.html
</IfModule>
<FilesMatch "^\.ht">
Order allow,deny
Deny from all
Satisfy All
</FilesMatch>
ErrorLog "logs/error_log"
LogLevel warn
<IfModule log_config_module>
LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\"" combined
LogFormat "%h %l %u %t \"%r\" %>s %b" common
<IfModule logio_module>
# You need to enable mod_logio.c to use %I and %O
LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\" %I %O" combinedio
</IfModule>
CustomLog "logs/access_log" common
</IfModule>
<IfModule alias_module>
ScriptAlias /cgi-bin/ "/usr/local/apache2.2.22/cgi-bin/"
</IfModule>
<Directory "/usr/local/apache2.2.22/cgi-bin">
AllowOverride None
Options None
Order allow,deny
Allow from all
</Directory>
DefaultType text/plain
<IfModule mime_module>
TypesConfig conf/mime.types
AddType application/x-compress .Z
AddType application/x-gzip .gz .tgz
</IfModule>
<IfModule ssl_module>
SSLRandomSeed startup builtin
SSLRandomSeed connect builtin
</IfModule>
<Proxy balancer://spacecluster>
# cluster members
BalancerMember http://www.iche.com:4000
BalancerMember http://www.iche.com:4001
BalancerMember http://www.iche.com:4002
BalancerMember http://www.iche.com:4003
</Proxy>
ExtendedStatus On
<Location /server-status>
SetHandler server-status
</Location>
<Location /balancer-manager>
SetHandler balancer-manager
</Location>
<VirtualHost www.iche.com:80>
ServerName www.iche.com
#DocumentRoot "/home/pingan/iche2/trunk/iche"
ProxyRequests Off
ProxyPass /balancer-manager !
ProxyPass /server-status !
ProxyPass / balancer://spacecluster/
ProxyPassReverse / balancer://spacecluster/
</VirtualHost>
httpd2.conf :
ServerRoot "/usr/local/apache2.2.22"
Listen 127.0.0.1:8080
LoadModule cache_module modules/mod_cache.so
LoadModule proxy_module modules/mod_proxy.so
LoadModule proxy_ftp_module modules/mod_proxy_ftp.so
LoadModule proxy_http_module modules/mod_proxy_http.so
LoadModule proxy_scgi_module modules/mod_proxy_scgi.so
LoadModule proxy_ajp_module modules/mod_proxy_ajp.so
LoadModule proxy_balancer_module modules/mod_proxy_balancer.so
LoadModule rewrite_module modules/mod_rewrite.so
<IfModule !mpm_netware_module>
<IfModule !mpm_winnt_module>
User daemon
Group daemon
</IfModule>
</IfModule>
ServerAdmin [email protected]
ServerName 127.0.0.1:8080
#DocumentRoot "/usr/local/apache2.2.22/htdocs"
<Directory />
Options FollowSymLinks
AllowOverride None
Order deny,allow
Deny from all
</Directory>
<Directory "/usr/local/apache2.2.22/htdocs">
Options Indexes FollowSymLinks
AllowOverride None
Order allow,deny
Allow from all
</Directory>
<IfModule dir_module>
DirectoryIndex index.html
</IfModule>
<FilesMatch "^\.ht">
Order allow,deny
Deny from all
Satisfy All
</FilesMatch>
ErrorLog "logs/error_log"
LogLevel warn
<IfModule log_config_module>
LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\"" combined
LogFormat "%h %l %u %t \"%r\" %>s %b" common
<IfModule logio_module>
# You need to enable mod_logio.c to use %I and %O
LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\" %I %O" combinedio
</IfModule>
CustomLog "logs/access_log" common
</IfModule>
<IfModule alias_module>
ScriptAlias /cgi-bin/ "/usr/local/apache2.2.22/cgi-bin/"
</IfModule>
<Directory "/usr/local/apache2.2.22/cgi-bin">
AllowOverride None
Options None
Order allow,deny
Allow from all
</Directory>
DefaultType text/plain
<IfModule mime_module>
TypesConfig conf/mime.types
AddType application/x-compress .Z
AddType application/x-gzip .gz .tgz
</IfModule>
<IfModule ssl_module>
SSLRandomSeed startup builtin
SSLRandomSeed connect builtin
</IfModule>
<Proxy balancer://spacecluster>
# cluster members
BalancerMember http://127.0.0.1:5000
BalancerMember http://127.0.0.1:5001
BalancerMember http://127.0.0.1:5002
BalancerMember http://127.0.0.1:5003
</Proxy>
ExtendedStatus On
<Location /server-status>
SetHandler server-status
</Location>
<Location /balancer-manager>
SetHandler balancer-manager
</Location>
<VirtualHost 127.0.0.1:8080>
ServerName www.iche.com
#DocumentRoot "/home/pingan/iche2/trunk/iche_manager"
ProxyRequests Off
ProxyPass /balancer-manager !
ProxyPass /server-status !
ProxyPass / balancer://spacecluster/
ProxyPassReverse / balancer://spacecluster/
</VirtualHost>
两个配置文件中除了监听的端口、DocumentRoot和PidFile路径不同外其他地方均可相同（根据自己需求适当修改）。
分别使用以下命令启动或关闭：
/usr/local/apache2.2.22/bin/httpd -f /usr/local/apache2.2.22/conf/httpd2.conf -k start|stop|restart
/usr/local/apache2.2.22/bin/httpd -f /usr/local/apache2.2.22/conf/httpd.conf -k start|stop|restart
另外：/usr/local/apache2.2.22/bin/httpd -k restart 命令只会导致子进程（apache用户进程，如simon用户）重新启动，而主进程（root用户）是不会重新启动的。