You might run into a situation where while trying to restart apache service while using linux web hosting services, you receive an error :
(20014)Internal error: Error retrieving pid file logs/httpd.pid
Remove it before continuing if it is corrupted.
There is nothing to worry about, you must run the following commands to get apache working again.
Rename httpd.pid or remove it from the logs directory of apache (/usr/local/apache/logs/) and restart the apache service.
The Apache service would start work fine after this.