While monitoring a http/php server, I needed to do some statistics about php-cgi memory usage.
Playing with memory_limit in PHP, we wanted to know the average memory usage per php-cgi process. This is easily calculated with our best friend awk.
First, get the number of php running processes:
# ps aux | grep php-cgi | grep -v grep [...]

When you put your website in maintenance mode, it’s a good idea to return a HTTP 503 error code to the client.
This code indicates that “the server is currently unable to handle the request due to a temporary overloading or maintenance of the server”.
The 503 code is used to avoid crawlers or [...]