There are a few ways to add a user to a group in Linux. I will cover two methods using the command line. Both methods require the ability to use the root account or the sudo command. Desktop environments often have GUI tools to do this. If you wish to use the GUI, check your… Read More »
To add a user to sudoers, edit the file /etc/sudoers. Many systems come with a /etc/sudoers file that gives permission to a specific group. If your /etc/sudoers has a line that looks like one of these, you can allow a user to use sudo by adding the user to that group. %sudo ALL=(ALL:ALL) ALL %sudo… Read More »
To create a symbolic link on a UNIX or Linux system, use the ln command with the -s option. You may see or hear a symbolic link referred to as a soft link or symlink. All three terms mean the same thing. Here is an example: $ ln -s file_name link_name $ ls -l total… Read More »
On Linux and UNIX systems, there are two types of links. Both types are created with the ln command. They function similarly but have some differences. First, you need to understand a little bit about how filesystems work. Filesystems store meta data such as permissions, modification times, and the location of the file’s data on… Read More »
This guide will walk you through installing OpenLDAP from source on CentOS 8. It should work with Red Hat Enterprise Linux (RHEL) 8, Oracle Linux 8, and any other RHEL clones. I am assuming you are able to use a command line shell and text editor on a UNIX like operating system. This guide was… Read More »
The OpenLDAP audit log overlay is used to track changes to a database. It stores its data in an LDIF file. On busy servers, consider setting up a cron job to automatically rotate, compress, or archive the log file. Setting up the OpenLDAP audit log overlay is pretty straightforward. There are only a few steps… Read More »
Zipping a Folder Use the zip command with the -r option to zip a folder on a Linux system. For example, to zip a folder named bigfiles, you would use the following command: $ zip -r bigfiles.zip bigfiles adding: bigfiles/ (stored 0%) adding: bigfiles/bigfile2 (deflated 98%) adding: bigfiles/bigfile3 (deflated 96%) adding: bigfiles/bigfile1 (deflated 97%) After… Read More »
To rename a file in Linux, you use the mv command. The mv command can also rename directories and move files into different directories. When using mv, always specify the current filename first, followed by one or more spaces, and last the new name. For example, to rename a file named my_file.pdf to your_file.pdf, use… Read More »
Increasing the size of a Disk in VirtualBox can be done with the GUI or the command line. I will cover both methods. Resizing the partitions and filesystems on the virtual machine using the disk is beyond the scope of this guide. Directly below are quick procedures. If you want a more in depth explanation… Read More »
The OpenLDAP password policy overlay allows administrators to implement password policies such as minimum length requirements and expirations. This guide explains how to use it and demonstrates with a few examples. The password policy overlay configuration is a bit different from other overlays. The configuration of most overlays takes place in the overlay entry of… Read More »