There are several ways to install an RPM on CentOS. This guide covers the command line programs yum and rpm. There are GUI tools, such as PackageKit, to manage packages, but since the command line tools will always be available, those are what I will cover. In most cases, you probably want to use yum.… Read More »
There are two main ways to delete a file on a Linux based operating system. Keep in mind that removing a file as described in this guide just removes references to the underlying storage system. Forensic tools may be able to recover their contents. There are ways to delete files that prevent their recovery, but… Read More »
The Linux Professional Institute (LPI) Exam 010 objective 1.2 is awareness of major open source applications and their development. This guide applies to exam version 1.6. Disclaimer: I have not taken the exam. I do have more than a decade of professional experience working with Linux and open source software. Using my study guide does… Read More »
Rsync backups are versatile. You can can create full, differential and incremental backups of a directory. Rsync can backup files locally or remotely. Local Backups If you are backing up to another directory, removable storage, or a locally mounted network file system, then you will be creating local backups. Creating Local Backups To create a… Read More »
To temporarily disable SELinux on CentOS 7, run this command as root: root@centos7 ~]# setenforce 0 If you want to turn it back on, use the command: root@centos7 ~]# setenforce 1 This will not persist across a reboot. If you want it to be disabled when the system boots, edit /etc/sysconfig/selinux and replace this line:… Read More »
OpenLDAP Multi-Master Replication is for high availability, not load balancing. If a split-brain is possible, consider the mirror mode architecture described in the OpenLDAP Administrator’s Guide. A split-brain is where two or more nodes of a cluster are operating independently, which can cause the cluster data to become corrupt or out of sync. If you… Read More »
This guide will walk you through setting up CentOS 7 to use an LDAP directory server for authentication. This guide will not work with CentOS 8. If you want to use LDAP authentication with CentOS 8, click here. I am assuming you have a directory server up and running. If you don’t, you can follow… Read More »
This guide will walk you through setting up OpenSUSE LEAP 15 to use an LDAP directory server for authentication. I am assuming you have a directory server up and running. If you don’t, you can follow these two guides to install and configure OpenLDAP: Install OpenLDAP From Source – OpenSUSE Configure OpenLDAP Install Packages First,… Read More »
This guide will walk you through setting up Debian Stretch to use an LDAP directory server for authentication. I am assuming you have a directory server up and running. If you don’t, you can follow these two guides to install and configure OpenLDAP: Install OpenLDAP From Source – Debian Stretch Configure OpenLDAP Install Packages First,… Read More »
This guide will walk you through setting up an OpenLDAP server for authenticating and managing users on Linux and UNIX. I am assuming you already have the OpenLDAP server installed and running with no backends configured. I recommend installing OpenLDAP from source, but this guide should work if you installed from a repository. I have… Read More »