Archive for October, 2013


Can One Virtual Machine Compromise the Security of Another?

One of the frequently mentioned benefits of VPS hosting is that it is more secure than shared hosting because your account is walled off from other accounts, allowing them to function as separate servers. Virtual private servers and virtualization in general are generally thought to be secure. So, can one virtual machine compromise the security […]

How to Modify Account Quotas with WHM

One of the very useful features of cPanel’s WebHost Manager (WHM) is the ability to control user quotas, the amount of disk space allotted to a given user account. Once an account reaches its disk quota, no more files can be added.
To modify an account’s quota, navigate WHM to Home >> Account Functions >> Quota […]

5 Basic Server Security Tips

As we approach the end of the year, now might be a good time to review your security practices and fix any weaknesses in your system. The following are 5 basic security tips to keep your server secure.
1. Secure remote access – Whenever possible limit the amount of remote access users can obtain, and secure […]

How to Force Installation of Ubuntu Packages Kept Back

Ever so often, you might try to update your Ubuntu Server packages and find that certain ones are “kept back” during the upgrade process. These will often be kernel or other mission critical packages that do not get updated.
The reason some packages might get kept back is that some dependencies have been changed for them, […]

How do I Greet Linux Users with a Login Message?

There may be times when you want to send a message to your server users that they all can see when they log in. While “wall” allows you to send messages to currently logged in users, you need a different tool to make sure all users get it whenever they happen to log […]

How to send a system message to all *BSD users

Any good system administrator needs to be able to send authoritative messages to any online users. Fortunately, with BSD variants such as FreeBSD and OpenBSD, it is very easy with a tool called “wall”.
To send a general message to all users logged into the system, follow this format:

# wall
your message here
more of your message

At the […]

How to Reduce MySQL Server Load

MySQL is one of the most widely used relational database management systems (RDMS), but it can also be responsible for placing a heavy load on your server if you do not manage it well. The more traffic you get coming to your site, the harder your database server will have to work. While you can […]

Improve PHP Performance with HipHop

HipHop can improve your server’s PHP performance. No, I do not mean the hip hop you might hear on your favorite rapper’s latest album. In this case, HipHop refers to some PHP improvements originally created by Facebook and then released as free and open source software. HipHop can significantly increase PHP web application speed and […]

Virtualization Tips for System Administrators

Virtualization has been one of the best technologies to develop in a long time for many organizations. Server deployment times are shorter, data centers are more energy efficient, and overall operational costs are down. In short virtualization is almost certainly something you should consider for your servers. What follows are some tips that should […]