How to Display Banners in Linux Command Line
Do you want to display cool or funny banners in your Linux console? Try two commands, which generate banners: banner or figlet.
Author: Grzegorz Juszczak
How to Create LVM Volume Group and Logical Volume
Logical Volume Manager (LVM) is a device mapper target that provides logical volume management for the Linux kernel. LVM allows to create Logical Volumes from underlying Physical Hard Disks (Physiacal Volumes). Logical Volumes can be easily extended and shrunk according […]
Detect Intrusion and Check Linux File System Integrity with AIDE
If you suspect that your system was compromised and files and/or their permissions were modified by the intruder, you can use AIDE to check your file system against some modifications. AIDE (Advanced Intrusion Detection Environment) is a file integrity checker […]
Display Hardware Topology in Linux
Sometimes we need to know what is our system configuration (CPU, RAM, network interfaces, etc…), but we don’t want to open computer case to look what’s inside or even don’t have such possibility, especially when we are connected to remote […]
How To Detect Physical Interface Connectivity to the Network in Linux
How to verify, if cable is connected to the interface in Linux? How to verify physical connection to network on interface in Linux? If you are away from the server and unable to see if ethernet cable is connected to […]
Install OpenStack on KVM – How To Configure KVM for OpenStack
Typical OpenStack cloud setup consists of more than one node (usually one Controller node and several Compute nodes), which requires lot of physical computers / servers available to perform the installation. This complicates the situation, especially if we need to […]
How to Disable or Enable SELinux on CentOS / Fedora / RHEL
SELinux (Security Enhanced Linux) is an additional method of Linux system protection. It’s a group of security contexts that determine which process can access which files, directories, ports, etc… SELinux has three modes: Enforcing: SELinux protects files, directories, ports against […]
How to compare two files in Linux command line
You can compare two text files in Linux using the following command-line tools: – diff – vim / vimdiff These tools are already installed “out-of-the-box” in most Linux distributions.
How to Configure Passwordless SSH Login in Linux
Secure Shell (SSH), besides standard password authentication, gives us the possibility to authenticate using private – public key relation. This allows us access remote systems without typing the password each time we want to connect and the connection is still […]
Install and Configure DHCP Server on CentOS 7 / RHEL 7
DHCP (Dynamic Host Configuration Protocol) is a network protocol used for dynamically assigning IP addresses for computers attached to the network. Standard port used for DHCP service: 67(UDP). In this tutorial we will launch dhcp server on CentOS 7 / […]