Category Archives: Linux

Using Apache keepalives on your server can reduces CPU usage since it allows the same connection to be used for images, stylesheets, javascript, etc. If KeepAlive is disabled a separate connection must be made for each of those files. Creating … Continue reading →

Cause of 503 Service Unavailable Errors The 503 Service Unavailable error is an HTTP status code that means the web site’s server is simply not available right now. Most of the time this is because the server is too busy … Continue reading →

When you are trying to troubleshoot a site and see that, from a host perspective, nothing is overloaded or in trouble. Run: lsof -ni | grep httpd | wc -l If that number is the same as (or about the … Continue reading →

TO ensure that a service does not start at reboot, use the following tools: chkconfig servicename off or ubuntu: update-rc.d servicename disable

Pick the appropriate one for your operating system: usermod -g www-data -G username username usermod -g apache -G username username

How to connect apache and tomcat mod_proxy_ajp is an Apache module which can be used to forward a client HTTP request to an internal Tomcat application server using the AJP protocol. Make sure this line is in the httpd.conf: LoadModule … Continue reading →

Add the following to your .htaccess file to prevent files from being accessible from external sites: Order deny,allow Deny from all Allow from localhost 127.0.0.0/8 ::1 externalIP/32

cat access.log | awk ‘{print $1}’ | sort | uniq -c | sort -g

The “mysqlbinlog” command reads the binary logs and outputs them in SQL format. As a result, you can use it to create a database dump and then modify that file by hand. For example, let’s say that everything since April … Continue reading →