http://www.linuxatemyram.com/ Is a one page web site that clearly explains how Linux has a huge grey area between free memory and memory that is reserved. This is essential reading if you want to become an expert in this operating system.
I often hear people complain that ownCloud is impossible to upgrade and I have been through that pain myself. However after repeatedly going to such extremes as uninstalling and starting from scratch I have found a series of steps that while simple are not entirely obvious. Update I has been pointed out to me on… Continue reading Upgrading ownCloud on Ubuntu
The following is a list of Linux server software that is used in many, many situations to provide infrastructure to other services. If you want to be a sys admin you must know these. OpenSSH: This server is used to provide authenticated command line access to remote servers. Additionally it can also be used to… Continue reading Core Linux servers
In this part I will explain how to further improve the server’s security by replacing traditional passwords with public key authentication. Before deciding to follow this tutorial please consider the following problem: While replacing passwords with private/public key pairs is an enormous improvement in security it also requires specially preparing your workstation for logging into… Continue reading Securing SSH on Linux Part 2
Update: Rather embarrassingly I forgot to include restarting sshd. Also I have edited my formatting of the commands shown. When you first set-up your Linux VPS the chances are that you are told to log in as ‘root’ directly, possibly even using a password like ‘123456’! The steps in this two part tutorial should be… Continue reading Securing SSH on Linux Part 1