Tag: Command-line

Now that you have seen the basics of exigrep, let us dive into some e-mail troubleshooting where exigrep really shines.

Domain Name Service, or DNS, can be one of the most be one of the more complicated concepts in server administration. This article will walk through changing an A record from the Linux command line.
This article assumes that you are running BIND on a linux server, that you already have an understanding of what DNS is, the different types of DNS entries, and how DNS works. Please note: The incorrect editing of your zone file can take your site offline. All editing must be done on the authoritative nameservers for the given domain.

Perhaps a particular domain on your cPanel server has stopped receiving e-mail. Or, an address on your domain is able to receive e-mail, except from your supplier. Maybe you can receive e-mail just fine, but are receiving error message bounce-backs from Yahoo. How are you going to get the fine-grained information you need to figure out just what is going on?

‘Premature end of script headers’ can be an extremely vague error that leads to some headaches. Here are some suggestions that might help you fix the problem.

If Apache fails, and will not successfully start again, check the error log. If you see an error similar to the following, it could indicate that your server has run out of semaphores.

This is part 3 in an ongoing series on WordPress. Please see Part 1: WordPress Tutorial 1: Installation Setup and Part 2: WordPress Tutorial 2: Terminology and Part 4: WordPress Tutorial 4: Recommended WordPress Plugins. Please note that this guide is primarily intended for customers utilizing a Linux server running cPanel. If you do not have a Linux server with cPanel please see the documentation at wordpress.org for further assistance.

Whenever making DNS changes, lowering your TTLs (Time To Live) 24 hours ahead of time will reduce the amount of time that your change takes to propagate.
This article assumes that you are running BIND on a Linux server, that you already have an understanding of what DNS is, the different types of DNS entries, and how DNS works. Please note: The incorrect editing of your zone file can take your site offline. All editing must be done on the authoritative nameservers for the given domain.

When reviewing the resources utilized by your server, there are a plethora of tools at your disposal. The sar command is a powerful Linux command line utility that can be used to review a server’s resource usage.

So, you know how to ssh into your server. But how do you know if anyone else is shelled into your VPS server or Dedicated server?

What is CSF?

CSF or Config Server Firewall is an alternative firewall to APF.