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 »
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 »
While I prefer nss-pam-ldapd for authentication and password resolution on Linux systems, sssd has a few advantages. I consider the biggest advantage of SSSD is the ability to cache credentials. I am going to assume you have a directory server up and running. If not, you can always follow my guides on installing OpenLDAP and… Read More »
Adding a disk to LVM is pretty straightforward. The typical scenario is you have a virtual machine (VM) that is running low on space, so you add another virtual disk to it. Another possible scenario is adding another physical disk to create a software mirror. Perhaps you have a new host and wish to store… Read More »
While they aren’t always installed by default, the programs dump and restore are great tools for backing up and restoring ext4 filesystems. They are flexible and easy to use. dump/restore features: Support for full, differential, and incremental backups Can read from and write to standard input and standard ouput When writing to removable media, it… Read More »
The Linux find program is very powerful. It has a small learning curve, but a little time spent learning find now will save you a lot of time later. The Linux find command isn’t actually part of Linux. It is a program that is part of the GNU findutils project. It can be installed on… Read More »