Stop SPAM in Postfix with Spamassassin
So you have your Ubuntu server up and running with a Postfix mail server (see "Install Postfix for reliable email delivery"). You have also set up Postfix for antivirus with the help […]
Add antivirus to Postfix with ClamAV
By now you have your Postfix mail server up and running (see "Install Postfix for reliable email delievery"). You even have relaying working (see "Mail relaying made simple with Postfix"). But one […]
Asset scanning with nmap and ndiff
If you are in a small business or a larger enterprise you know you need to keep track of all those machines. Sure you could easily tag and record them as they […]
Troubleshoot networking problems with GNOME's Nettools
How many times have you had networking issues and not known exactly where to start? With Linux there are so many tools you can choose from. Add to that the choice between […]
Five handy secure shell tips and tricks
I use secure shell a LOT, every day. So much so that I often take for granted how important this tool is. Not only does it allow me to log into remote […]
Backup your Linux box with rsync
In this Linux backup series we have taken a look at Flyback ("Quick and easy backups with Flyback"), Backerupper ("Simple gui backup tool Backerupper"), and Back In Time ("Linux Back In Time: […]
Use this iptables script for Web/Mail server security
Security. Ah, security. It's the make or break for administrators on so many levels. For the Linux operating system you could go in so many directions with your security. You could go […]
Manage your ssh connections with SecPanel
I do a lot of work with secure shell. There are times when I am connected, via ssh, to multiple machines. Managing these connections can be a real hassle (especially when you […]
Mail relaying made simple with Postfix
Have you installed the Postfix as an easier to use, more secure alternative to Sendmail only to find yourself having trouble with the old "unable to relay" errors? This can be very […]
Configure your Ubuntu Server as a DHCP server
In my recent Ubuntu Server articles I have covered the following topics: Installing Ubuntu Server 9.04 Set up your new Ubuntu Server as a Samba server Add FTP service to your Ubuntu […]
Set up your new Ubuntu Server as a Samba Server
I recently did an illustrated guide to installing Ubuntu Server 9.04 ("Installing Ubuntu Server 9.04"). I did that for two reasons: 1) It was requested and 2) It will serve as a […]
Map your network with Zenmap
Nmap is one of the most useful network discovery tools you will ever use. Nmap allows you to explore networks of any size to determine the following information: Port details Host details […]
Manage your Active Directory from Linux with adtool
Active Directory is one of those Microsoft tools that so many have no choice but to use. Although I much prefer LDAP because it is so much easier to set up and […]
How to: Install a LAMP server
If you've read enough of my Ghacks tutorials you have most likely come across mention of a LAMP server. If you are not sure what a LAMP server is: Linux Apache MySQL […]
Install mod_security for better Apache security
Recently I wrote an article to help you secure your Linux Apache Installation (see "Five ways to help secure Apache on Linux"). In that article I mentioned using Apache's mod_security, but didn't […]
Assign IPv6 addresses in Linux
It is inevitable that IPv6 addresses are going to eventually take over. When that happens you will need to know just how to assign an IPv6 address in your Linux operating system. […]
Set your hostname in Linux
If you are an administrator then you know what a hostname is. If you are not an administrator then you should know the hostname of a computer is the name which a […]
Map your network with Lanmap
This morning I needed a visual representation of my local Lan in order to find out what machines were associated with what IP addresses. For this task I used a tool that […]