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 »
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 »
Unless you are using some kind of management tool, you use ldapadd to add a user to an OpenLDAP database. Before doing so, you will need a few pieces of information: What type of user you are creating (e.g. POSIX or non-POSIX) The LDAP suffix of the database you wish to add the user to.… Read More »
How to change an OpenLDAP password depends on whether it is a regular user or an administrative user. The configuration directory and each database (with a few exceptions) have an administrative account. I will cover how to change all three. Run all of the commands in this guide on your directory server as the root… 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 »
Checking disk space in Linux can done with the command line progams df and du. df is used to show usage at the filesystem level, while du can be used to show how much space individual files and directories use. If you aren’t familiar with how Linux presents storage devices, you will probably want to… Read More »
Mounting a Windows share on Linux is pretty straight forward. You need a Windows user that can access the shares, the name of the work group or domain, and the name of the share. First, make sure you have mount.cifs installed, then create a credentials file, and finally mount the share. You can also add… Read More »
How the hostname is set is operating system specific. This is because the hostname is typically set by the startup process, and different operating systems have different startup processes. CentOS is no different. CentOS 7 uses systemd, while CentOS 6 uses upstart. This means how to change the hostname in CentOS depends on which major… Read More »
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 »