I am proud to announce I just received the results for my RHCSA and I passed with a score of 300. It’s my understanding that is 100%! unfortunately I only got a 91 for my RHCE. Before anyone asks, I won’t say what’s on the test. I worked hard to take them, and I personally […]
This is an interesting objective – something that I have never had to do before. After looking around at various tutorials and such, the wording of the objective is even more confusing – RPM packages are designed to install programs, not just copy a file. For example, there is a great how-to for creating RPM […]
Changing runlevel on a live system is fairly simple – as root simply type init 3 (or whatever runlevel you want).However, what if you need to specify a runlevel at boot time? Imagine there is something wrong with your X configuration that is stopping you from being able to log in, how do you force […]
There are multiple methods and options available when installing Redhat. Here are just a few options and how to perform them.VNC Insert the installation DVD and boot the system At the installation prompt, hit [TAB] to modify the boot options At the end of the boot command, enter vnc and hit enter to start the […]
This objective is quite a bit more ethereal than the others – with no clear end game, this could mean almost anything. With that in mind, here are a few of the very basic scripts that I have found to assist in automating management. A good place to find help is the man bash page […]
sar appears to be the tool to save the day here. Installed and running by default, the sysstat package contains tools that capture system performance throughout the day, and automatically summarizes it for you. Generating utilization reports is then a simple matter of knowing the right sar command to execute. If all else fails, simply […]
This is a simple one, similar to defaulting to accept mail locally, by default postfix will only send mail to local recipients. Install the necessary packages yum install postfix Edit the /etc/postfix/main.cf file Find the relayhost section and add a line relayhost = 192.168.10.1 Restart the service service postfix restart You should be able to […]
The easiest way to configure NTP is to use the GUI. On the top bar, right-click the time and select Preferences Click Time Settings and the Set System Time Check the box Synchronize date and time over the network Edit the list of NTP servers and click OK Alternatively, you can execute system-config-date to go […]
This is a simple one, by default postfix will accept only mail originating locally, and all it takes is updating a config file to change that. Install the necessary packages yum install postfix Edit the /etc/postfix/main.cf file Find the line inet_interfaces = localhost and change it to inet_interfaces = all Restart the service service postfix […]
One of my favorite things to do when managing Linux systems is to configure key-based authentication. This allows me to connect to multiple systems via scripts without have to re-authenticate every time. A decent walkthrough is available at http://linuxproblem.org/art_9.htmlScenario: You are user A on host A, and you want to log onto host B as […]