Tag Archives: rewrite

Apache ProxyPass for WordPress master-slave setup

Simple way

Ensure certain traffic goes to a certain server (master), you can use this:

<LocationMatch "^/wordpress/wp-admin/?.*>
ProxyPreserveHost On
ProxyPass http://ip.of.master.server/
</LocationMatch>

 

For a better setup with Variables, just follow the… following steps 🙂

Step One: Configure Environment

We need to setup some environment variables to get this to work correctly.
Add the following to your environment on the slave server(s):

RHEL/CentOS: /etc/sysconfig/httpdi

OPTIONS="-DSLAVE"
export MASTER_SERVER="SERVERIP HERE"

Ubuntu: /etc/apache2/envvars

export APACHE_ARGUMENTS="-DSLAVE"
export MASTER_SERVER="SERVERIP HERE"

Step Two: Configure your VirtualHost

In your VirtualHost configuration do something like the following.

<IfDefine SLAVE>
RewriteEngine On
ProxyPreserveHost On
ProxyPass /wp-admin/http://${MASTER_SERVER}/wp-admin/
ProxyPassReverse /wp-admin/http://${MASTER_SERVER}/wp-admin/

RewriteCond %{REQUEST_METHOD} =POST
RewriteRule . http://${MASTER_SERVER}%{REQUEST_URI} [P]
</IfDefine>

 

Apache Rewrite rules

Rewrite rules examples:

This can be added in vhost configuration OR in .htaccess file

How to rewrite all web request on my site without www to www.domain.com

RewriteCond %{HTTP_HOST} !^www\.example\.com$ [NC]
RewriteRule (.*) http://www.example.com$1 [R,L]

 

How to redirect all web requests on port 80 (or HTTP) to port 443 (HTTPS)

RewriteCond %{SERVER_PORT} !^443$
RewriteRule ^/(.*) https://%{SERVER_NAME}/$1 [L,R]

 

How to disable TRACE and TRACK methods on Apache

RewriteCond %{REQUEST_METHOD} ^(TRACE|TRACK)
RewriteRule .* - [F]

 

How to exclude mod_status from being rewritten by existing rules (placed before the problem rule)

RewriteCond %{REQUEST_URI} !=/server-status

 

How do I redirect all web requests on www.mysite.net/web to www.mysite.net/sect1/web

RewriteCond %{http_host} ^[www\.]*example\.com
RewriteRule ^web(/)?$ /sect1/web [R=301,L]

 

Rewrite all non-www to www

RewriteEngine On
RewriteCond %{HTTP_HOST} !^www\. [NC]
RewriteRule ^(.*)$ http://www.%{HTTP_HOST}%{REQUEST_URI} [R=301,L]

 

Force all URLs to be lowercase

RewriteEngine On
RewriteMap lc int:tolower
RewriteCond %{REQUEST_URI} [A-Z]
RewriteRule (.*) ${lc:$1} [R=301,L]