You might save some time and have a little fun by putting some aliases and functions in your .bashrc file. You can put functions or aliases in .bash_profile or .bashrc in your home directory. But by using .bashrc instead of .bash_profile, they’ll be read in not only when you log in, but whenever you start […]

Sometimes in the course of a system’s existence you find that the swap partition you set up at install-time just isn’t enough anymore. Maybe you’re upgrading your system to RedHat 7.1 from a version of RedHat that used less swap in relation to physical RAM. Perhaps you’re running Oracle. Or maybe you’re adding more memory […]

You can get it from the mirrors here: kernel.org/mirrors or here: kernel.org. Check our our article on compiling the Linux kernel. One trick we’d like to remind you of from the article is to use “make oldconfig” to migrate your old .config file (usually in /usr/src/linux). You will be asked about just the options that […]

You might save some time and have a little fun by putting some aliases and functions in your .bashrc file. You can put functions or aliases in .bash_profile or .bashrc in your home directory. But by using .bashrc instead of .bash_profile, they’ll be read in not only when you log in, but whenever you start […]

Before you do anything else, make sure you have a way to boot the OS.  Make a bootdisk and test it. Get the source for the kernel and put it in /usr/src. cd /usr/src tar -xzf <kernel source file name> The kernel source lives in /usr/src/linux.  Linux is usually a symbolic link to the source […]

uname -a You’ll see something like this: Linux u-1.signalq.com 2.4.6 #2 SMP Sat Jul 14 09:02:08 PDT 2001 i686 unknown

One task that we often do is remove rpms that are installed by default. In this example, we will find out what rpm apache uses and we will uninstall it. What we need to do is find the name of the apache package: [root@srv-3 RPMS]# rpm -qa | grep apache apache-1.3.19-5 [root@srv-3 RPMS]# So, we […]

For those of you who wish to learn more about how a GNU/Linux system is put together, or if you want to have more control over your GNU/Linux system, check out Linux From Scratch (LFS). The commands for building a system from scratch are provided, as well as step-by-step instructions and explanations. Simply download the […]

I’ve mentioned Linux From Scratch in previous articles. I’ve discovered another tool related to this project that rocks called ALFS, or Automatic Linux From Scratch. ALFS puts all of the specifications for compiling a linux system into an XML document and generates most of a Linux From Scratch system automatically. There are a couple of […]

For those of you managing GNU/Linux systems, you are certainly familiar with the wide range of filesystem heierarchies and utility locations. This makes it difficult to move between different vendors’ distributions. This is changing, in a large part due to the FHS standard. Check it out: http://www.pathname.com/fhs/

Red Hat includes the checkconfig & service utilities to help you manage your start up scripts and save you a lot of typing. This is handy when you’re adding your own services and also in managing the already existing services. chkconfig is available if you want to use it on other distributions that may not […]

We have an old Sun box that won’t even run Solaris 8. Plus, Urbana wants to run Solaris 9 on the good Sun box, not GNU/Linux. After we optimized our system with Gentoo, we didn’t want to redo the compiles, especially on this slower box. We did a dump of the filesystem, installed Aurora on […]

In our article Serial Port Multiplexer, we documented a design for a shoestring budget console sharing device. Basically, if you have a bunch of servers that can run their consoles via a serial port, you can use our device to monitor all of these consoles remotely. Well, one of our boxes is sick, and we […]

If you are running Red Hat, you need to keep your RPMs up to date. Red Hat has a service you can subscribe to, but if you wish to do this manually, browse to the house of mirrors, and pick a site that has updates for your architecture. We put all of the updates in […]

We run Gentoo, and in our make.conf file we had CFLAGS=”-march=pentium4 -O3 -pipe -fomit-frame-pointer”. Well, it turns out there is a bug. If you run this script: python -c ‘int(10.1); int(10000.3); int(1.2)’ You will get an overflow error. The fix is to use CFLAGS=”-march=pentium3 -mcpu=pentium4 -O3 -pipe -fomit-frame-pointer”. We just ran emerge glibc, and the […]

One problem with Red Hat systems is that the kernel config is not as simple as, say, Slackware. You can’t simply just select the modules you think you need, add in devices, etc. and have the system boot correctly. The Red Hat config is quite customized. This is particularly true for workstation configs that use […]

Linux From Scratch is a GNU/Linux distribution that you compile and piece together yourself. Gerard Beekmans and the LFS team have published LFS 4.1 as a book with a companion CD. We think that this is a fabulous way to document the heart of GNU/Linux. Own your own distribution. Don’t be buffeted about by corporate […]

Did you know that you can recall the last argument to the last command you typed by using the special variable !$. This can be handy when you are working with host names, long file names, all sorts of things. A few examples: See if a host is up and log in: usr-3@srv-3 usr-3]$ ping […]

For a serious analysis of what is going on with the whole SCO/IBM thing, check out the OSI Position Paper. But, for some Friday fun, check out The GNUkes of Hazzard.