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Month: November 2015

Useful Tools to Display Network Usage in Linux

November 26, 2015June 1, 2016 1 Comment

In this article we would like to introduce you two simple and smart Linux command line tools to monitor bandwidth usage on all network interfaces in the real time: iftop and nload.

Grzegorz Juszczak Linux

Bash Script for Automated OpenStack Tenant Creation

November 25, 2015December 3, 2015 No Comments

During OpenStack deployment and testing you may need to quickly create: project tenants, tenant users, networks, routers, security groups, etc… just to check, if Cloud is working properly. Instead of arduous clicking all this stuff in Horizon dashboard, you can […]

Grzegorz Juszczak Bash, Cloud Computing

Add New Compute Node to Existing OpenStack using Packstack

November 21, 2015October 17, 2016 38 Comments

OpenStack is quite reliable Cloud solution, that provides extensibility and scalability. That means, if the Cloud is running out of resources for new tenants and instances, it can be easily extended with new Hypervisors (Compute nodes) practically on-line. In this […]

Grzegorz Juszczak Cloud Computing

How to Configure Yum with Proxy

November 19, 2015April 20, 2016 No Comments

If the server is placed in network behind firewall and outgoing traffic is blocked by firewall, the only chance to install new packages from remote repo is through proxy (if that exists).

Grzegorz Juszczak Linux

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

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