The default install of Red Hat Enterprise Linux 6 (RHEL6 and CentOS6) automatically includes the NetworkManager service which was optional in previous versions. The purpose for NetworkManager is to make RHEL6 more portable which is great for a notebook computer or perhaps a desktop. Portability is not a major concern for a server. Usually servers are fairly fixed and configuration of network settings is done statically using manual tools. NetworkManager also does not support many advanced networking features like IP forwarding. Continue reading “How To Uninstall, Disable, and Remove NetworkManager from RHEL6 and CentOS6”
Several students in our PHP/mySQL class have asked about installing Netbeans IDE and/or Sublime-Text editor in their CentOS6 virtual servers. After researching the installation instructions for these programs, I determined that there was no one place that explained what our students were looking for. Therefore, I am going to provide an installation guide here. Continue reading “How To Install Netbeans with JDK Bundle and Sublime-Text in CentOS6/RHEL6”
I am a bit OCD when it comes to time. I always have clocks around me. I especially like atomic clocks that synchronize with www.time.gov in Boulder, Colorado.
Back in 2003, our local Walgreens ran a special on atomic clocks for about $20.00 each. At that time atomic clocks were not as easy to find as they are now (just research them on amazon.com and see how many come up). I ended up buying two of these clocks – Model #701070 Item #C17D1775. Continue reading “Digital Atomic Wall/Desk Clock with Thermometer from Walgreens”
Log in as root and enter the following line of code:
gconftool-2 --direct --config-source=xml:readwrite:/etc/gconf/gconf.xml.defaults --type bool --set /apps/gdm/simple-greeter/disable_user_list true
Either reboot your server or log out and then log back in to check your fix.
As a budget cutback, our school administrators asked us to shutdown all non-essential classroom computers at night to save electricity. I teach Linux in a classroom that has a Dell Poweredge 2850 Red Hat Enterprise Linux (RHEL5) server and 29 Dell Optiplex 745 student lab computers running Microsoft Windows XP SP3 as the host operating system and VMWare Server to provide virtual Linux machines for our classes. I researched on the Internet for the best solution to remotely shutdown the student lab computers at night. I was not able to find one post or how-to that completely answered my questions, but I was able to piece together a solution. In an effort to document this project and help others with similar needs, here are my notes on the project. Continue reading “How To Remotely Shutdown Windows XP Computers from a Linux Server”