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Author: Grzegorz Juszczak

How to Display Banners in Linux Command Line

November 18, 2015November 18, 2015 2 Comments

Do you want to display cool or funny banners in your Linux console? Try two commands, which generate banners: banner or figlet.

Grzegorz Juszczak Linux

How to Create LVM Volume Group and Logical Volume

November 14, 2015September 19, 2016 No Comments

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 […]

Grzegorz Juszczak Linux, Storage

Detect Intrusion and Check Linux File System Integrity with AIDE

November 11, 2015May 16, 2016 No Comments

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 […]

Grzegorz Juszczak Linux, Security

Display Hardware Topology in Linux

November 8, 2015January 7, 2016 No Comments

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 […]

Grzegorz Juszczak Linux

How To Detect Physical Interface Connectivity to the Network in Linux

November 2, 2015November 2, 2015 No Comments

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 […]

Grzegorz Juszczak Linux

Install OpenStack on KVM – How To Configure KVM for OpenStack

October 21, 2015September 8, 2018 4 Comments

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 […]

Grzegorz Juszczak Cloud Computing, Virtualization

How to Disable or Enable SELinux on CentOS / Fedora / RHEL

October 16, 2015September 19, 2016 No Comments

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 […]

Grzegorz Juszczak Linux, Security

How to compare two files in Linux command line

October 12, 2015September 19, 2016 No Comments

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.

Grzegorz Juszczak Bash, Linux

How to Configure Passwordless SSH Login in Linux

October 8, 2015October 27, 2015 No Comments

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 […]

Grzegorz Juszczak Linux

Install and Configure DHCP Server on CentOS 7 / RHEL 7

September 20, 2015October 27, 2015 4 Comments

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 / […]

Grzegorz Juszczak Linux

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