A collection of system administration hints and tips, tricks and articles for the Linux operating system in all its variants.

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How to Change or Set hostname on OEL/RHEL/CentOS 7

Published   Read time 2 min(s) 18 sec(s)   (2541 visits).

Unlike OEL/RHEL/CentOS 6, manually appending “HOSTNAME=xxxxx” into file /etc/sysconfig/network and restarting system will not work on version 7.

Installing PHP GeoIP on Ubuntu

Published   Read time 1 min 20 sec(s)   (2704 visits).

A simple article providing the steps necessary to get GeoIP working with PHP on Ubuntu systems.

LVM Logical Volumes

Published   Read time 3 min(s) 1 sec   (3186 visits).

The use of logical volumes is similar to the use of partitions and is accomplished with the same standard commands (mkfs, mount, fsck, df, ...)

LVM Volume Groups

Published   Read time 2 min(s) 52 sec(s)   (2683 visits).

A volume group (vg) is an abstraction layer between block devices and logical volumes. The commands used to manage a volume group start with vg

LVM Physical Volumes

Published   Read time 3 min(s) 7 sec(s)   (2607 visits).

A physical volume (pv) is any block device (a disk, a partition, a RAID device, an iSCSI device, etc.)

Private and public key pairs for SSH

Published   Read time 3 min(s) 2 sec(s)   (1836 visits).

SSH has a key management capacity and related agents.When configured with public key authentication, your key proves your identity to remote SSH hosts

SSH configuration and security best practices

Published   Read time 2 min(s) 18 sec(s)   (2599 visits).

Here is a list of processes and configurations that you can use to tighten and enhance SSH security with regard to remote host access

How to disable Unity overlay scrollbars in Ubuntu

Published   Read time 1 min 54 sec(s)   (2530 visits).

How to easily restore the classing scroll bar (disable overlay scrolling) or to re-enable it if disabled under Ubuntu 14.04 and 16.04 LTS