FAQs

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

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

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

In this mini post I’ll show you how to  solve this git error message “Commit your changes or stash them before you can merge” which appears when you try to pull the latest code from your git repository and did some “not committed” modifications to your code/repository on your localRead More

In this post, I’ll show you how to reset the auto_increment field from a table in MySQL/MariaDB databases. Sometimes you need to drop all the data in an existing table and reset the auto_increment to start from 1. This post is dealing with only resetting the auto_increment to 1. ToRead More

In this post, I’ll show you how to drop a column from a table in MySQL/MariaDB databases. Sometimes you need to drop a wrongly created column in your table, or sometimes when you deploy a rails application and there is a database migration, if the deploy fail for any reasonRead More

If you want to hard-code DNS servers to use on CentOS or Fedora, the method can differ, depending on whether you use Network Manager or network service. On RHEL based systems, Network Manager is used to manage network interfaces by default, while you can switch to network service. Configure staticRead More

If you want to update all the packages other than one in your Debian server follow this procedure There are three ways of holding back packages, with dpkg, aptitude or with dselect. Option1: Using dpkg Put a package on hold echo “package hold” | dpkg –set-selections Example echo “apache2 hold”Read More

Suddenly, my Ubuntu update failed, and after checking my machine, I found that /boot partition is full, which caused this issue. I noticed that old kernel still exists in my system. In this mini post, your will find the answer for these question on Debian/Ubuntu Linux systems: Why doesn’t UbuntuRead More

When you research how to deploy your Rails app, you’ll see a lot of names: Apache, Unicorn, Puma, Phusion Passenger, Nginx, Rainbows, and many more. They all seem to fit under the “deploying Rails” category of software, but there’s a key difference between them. Some are “web servers,” and othersRead More