Of course, you can add, modify or delete users and groups on a CentOS 7 system via the command line. You can even set the default shell, create Sudo users (by adding the user to the Wheel group), set account expiration and password policies like password aging reminder to change Read More
Getting a good handle on IP commands will prove useful if you’re managing a Linux box. Although ifconfig was deprecated and replaced with ip several years ago, some folks sill use ifconfig. But it’s good to be aware of the basic ip commands when you’re managing a Linux server. Here Read More
Just this morning, someone asked me for the command to check if MySQL (or MariaDB) is running? I quickly blurted out: Do a top or htop and you should see it. # top | grep mysqld 26125 mysql 20 0 2618520 193692 9092 S 62.5 2.4 159:29.14 mysqld 26125 mysql Read More
A typical CentOS 7 Linux system has multiple kernels. How many kernels you have in your CentOS systems depends on the configuration setting. Sometimes you might feel the need to change the default kernel to a different one (it may be an older or newer kernel) to ensure a particular Read More
One of the most frequently used commands by Linux administrators of a Red Hat or CentOS system is the yum package management tool. Yum History – What For? Some would argue that Yum is the most powerful tool in a Linux systems administrator’s command line arsenal. So what does yum Read More
If you’ve been using a CentOS 7 or RedHat 7 system for some time and updating it regularly, you’re bound to accumulate multiple kernels. In this post, we’ll learn how to check the number of installed kernels on a CentOS, RedHat or Fedora box and remove the older ones. Check Read More