Linux

Passed my RHCSA exam! But not the RHCE

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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 […]

Linux

Programatically managing a user’s crontab

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In Linux, there is a central crontab or scheduler for the entire system. Trying to schedule things through here is often messy and full of problems, luckily there is also a crontab for each user (unless intentionally disabled). Accessing this scheduler is simple, just run crontab -e and it will open in vi, you then […]

Linux

Setting runlevel at boot

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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 […]

redhat

Installing Redhat in various ways

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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 […]

certification

System Configuration and Management — Produce and deliver reports on system utilization (processor, memory, disk, and network)

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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 […]

certification

NTP — Synchronize time using other NTP peers

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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 […]