• Howto remove/resolve Rails message “ PG::CharacterNotInRepertoire: ERROR: invalid byte sequence for encoding “UTF8”: 0xc2” on Linux Systems

    In this mini post I’ll show you how to  solve this Ruby on Rails error message “ActiveRecord::StatementInvalid (PG::CharacterNotInRepertoire: ERROR: invalid byte sequence for encoding “UTF8”:Read More

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  • How to Resize/Increase the Virtual Disk “LVM” of a Xen DomU Guest Virtual Machine

    In this mini post, I’ll show you how to resize/increase the size of the virtual hard disk used in a Xen DomU virtual machine “guest”.Read More

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  • How to Find and Kill Zombie Processes on Linux Systems

    In this mini post I’ll show you how to find and kill all zombie processes that may exist on your Linux Systems. First, we needRead More

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  • How to Install Xen Hypervisor on Debian 9 “Stretch” and Debian 8 “Jessie” Linux Systems

    In this article, we will discuss the installation of Xen hypervisor server on Linux systems (Debian Family “Debian 9 “Stretch” and Debian 8 “Jessie” /UbuntuRead More

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  • Howto remove/resolve Openvpn message “KEY_CONFIG pointing to the wrong version of openssl.cnf” on Linux Systems

    In this mini post I’ll show you how to  solve this Openvpn error message “KEY_CONFIG pointing to the wrong version of openssl.cnf” which may appearsRead More

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Howto remove/resolve Rails message “ PG::CharacterNotInRepertoire: ERROR: invalid byte sequence for encoding “UTF8”: 0xc2” on Linux Systems

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In this mini post I’ll show you how to  solve this Ruby on Rails error message “ActiveRecord::StatementInvalid (PG::CharacterNotInRepertoire: ERROR: invalid byte sequence for encoding “UTF8”: 0xc2” which may appears in the logs of rails applications connected to postgresql server. When we run certain url on our rails applications it gives:Read More

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How to Resize/Increase the Virtual Disk “LVM” of a Xen DomU Guest Virtual Machine

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In this mini post, I’ll show you how to resize/increase the size of the virtual hard disk used in a Xen DomU virtual machine “guest”. One of the challenges that comes with managing Xen domU instances is dealing with virtual machines that run out of disk space. If the initialRead More

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How to Find and Kill Zombie Processes on Linux Systems

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In this mini post I’ll show you how to find and kill all zombie processes that may exist on your Linux Systems. First, we need to define What is the Zombie process? and Why it exists? A process is called a zombie process or defunct process if the process has beenRead More

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How to Install Xen Hypervisor on Debian 9 “Stretch” and Debian 8 “Jessie” Linux Systems

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In this article, we will discuss the installation of Xen hypervisor server on Linux systems (Debian Family “Debian 9 “Stretch” and Debian 8 “Jessie” /Ubuntu 14.04, and higher”). The following steps worked on Debian 9 “stretch” and the result was installing xen 4.8 on Debian 9. For Debian 8 “Jessie”Read More

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Howto remove/resolve Openvpn message “KEY_CONFIG pointing to the wrong version of openssl.cnf” on Linux Systems

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In this mini post I’ll show you how to  solve this Openvpn error message “KEY_CONFIG pointing to the wrong version of openssl.cnf” which may appears when you try to Generate Keys and Certificates which needed in the installation process of OpenVPN server on Debian 9 “stretch” Linux systems. You canRead More

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How to Move/Migrate a Full Git Repository

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In this post, I’ll show you how to move a full git repository from github to gitlab. We’ve an old repository existing on github and we wanted to move it to our gitlab, so Here’s the steps we did: Step 1: Copy the entire repository Run the following command toRead More

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How to Install Gnome GUI on CentOS 7 / RHEL 7 Linux Systems

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Linux admins spend most of their time on working in a terminal; there are some who like to work on GUI instead of a terminal. By default, CentOS 7 installed as the minimal server, and user intervention is required to change the installation type. This guide will help you toRead More

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How to Copy/Move Docker Images and Export/Import Docker Containers between hosts

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In this post, we’ll show you how to copy/move a docker image between hosts and import/export a docker container between hosts. You may need to do this move images/containers between dev team to save time downloading Docker image from your private repository or save time consumed in adding your configurationRead More

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HTTP response status codes with a simple explanation

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In this post, we’ll show you the different types of HTTP status code. HTTP response status codes indicate whether a specific HTTP request has been successfully completed. Responses are grouped in five classes: informational responses, successful responses, redirects, client errors, and servers errors. Status codes are defined by section 10Read More

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Install openvpn server on Debian 9 “Stretch” Linux systems

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In this article we will discuss the installation of Openvpn server on Linux systems (Debian Family “Debian 9 “Stretch”/Ubuntu 16.04, and higher”). VPN, or virtual private network, is a secure method of connecting remote internet resources together as if they were under the same LAN. OpenVPN is a tool forRead More

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