February 9, 2009, 9:50 am
Simple enough, add an exclude line to the end of your [main] section in /etc/yum.conf , and you are done. Your yum.conf should look something like this:
[main]
cachedir=/var/cache/yum
keepcache=0
debuglevel=2
logfile=/var/log/yum.log
exactarch=1
obsoletes=1
gpgcheck=1
plugins=1
installonly_limit=3
exclude=gdm pidgin
This will prevent upgrades of the gdm package as well as pidgin. The list of apps in the exclude should be space sepeated. Shell wildcards ( * ? ) can also be included.
January 19, 2009, 9:08 am
In Redhat, Fedora, or Centos Linux, you’re required to type command such as “service sshd start” and the main problem is NO auto complete for service command by default. Yes I admitted I’m lazy guy!
So how to set AUTO COMPLETE “service” command on Redhat/Centos? Read Below.
Continue reading ‘Redhat/Fedora: Auto Complete for the “service” command’ »
November 19, 2008, 3:31 pm
One way to find your version of Red Hat is to type the following:
cat /etc/redhat-release
Continue reading ‘How to tell what version of Red Hat you have installed’ »
November 12, 2008, 11:19 am
A “service” is a program that starts automatically when you start your computer, and runs in the background. For example, the “network” service sets up your connection to the Internet and keeps it running correctly.
There are two ways to manage services in Fedora, one using the graphical tools, and one using only the command line. If you’re not in a graphical environment, use the command line method.
Continue reading ‘How to manage services in Fedora/Redhat’ »
October 25, 2008, 8:10 am
A cluster usually refers to a group of computers connected together so that more computer power, e.g., more MIPS (millions instruction per second), can be achieved or higher availability (HA) can be obtained.
Beowulf, Super Computer for the “Poor” Approach
Most super computers in the world are built on the concept of parallel processing–high-speed computer power is achieved by pulling the power from each individual computer. Made by IBM, “Deep Blue”, the super computer that played chess with the world champion Garry Kasprov, was a computer cluster that consisted of several hundreds of RS6000s. In fact, many big time Hollywood movie animation companies, such as Pixar, Industrial Light and Magic, use computer clusters extensively for rendering (a process to translate all the information such as color, movement, physical properties, etc., into a single frame of picture).
In the past, a super computer was an expensive deluxe item that only few universities or research centers could afford. Started at NASA, Beowulf is a project of building clusters with “off-the-shelf” hardware (e.g., Pentium PCs) running Linux at a very low cost.
In the last several years, many universities world-wide have set up Beowulf clusters for the purpose of scientific research or simply for exploration of the frontier of super computer building.
Continue reading ‘Building a Two-Node Linux Cluster with Heartbeat on Red Hat’ »
March 6, 2008, 12:19 am
yum’s commands are very easy and intuitive. These commands will be very useful in managing software in Fedora (based) systems.
Continue reading ‘The basics of yum’ »
