How to solve the sudoers error – “sorry, you must have a tty to run sudo”
I configured my sudoers file to run a command without a password and without a login terminal, but when execute...
Linux
List of Common Errors (and Solutions) while Installing and Configuring OpenStack Nova Service
In continuation to my previous articles on OpenStack Errors and Solutions for installation and configuration of KeyStone and Glance, today...List of Most Common Errors (and Solutions) While Installing OpenStack Image Service GLANCE
I was recently installing OpenStack Icehouse for one of my project by following the official documentation from openstack.org. During the installation of...How to Fix OpenStack’s Keystone Authentication Error – HTTP 500?
Here’s a question from one of our reader Praveen. Question: I’m installing Openstack on a CentOS machine by following the online documentation...Did you run ‘mysql_secure_installation’ after Installing MySQL? It helps Secure MySQL
The MySQL database package comes with an automated secure installation script called “mysql_secure_installation”. It’s advised to run this script soon...How to Install and Configure NTP for Time Synchronization in CentOS?
I was recently working on a Grid Computing project, where I had to install a grid middleware called Globus Toolkit....‘yum update’ Failed with an error message “Couldn’t resolve host’ on Centos – Here’s a Fix
One of our reader sent us the below question. Question: I have CentOS 4.9 installed on my PC and thought...Insert multiple lines of data onto a file after pattern matches using Linux shell script
Have a piece of code that has to be inserted in multiple files? Then, you are just like me having...[MySQL Error] : ‘/usr/share/mysql/english/errmsg.sys’ had only 480 error messages
My CentOS box runs with kernel 2.6. Today, I wanted to upgrade it to the recent version 3.14. Also, few important security...How to install latest version of PHP-5.5 using YUM on CentOS/RHEL/Fedora
We saw how to install/upgrade php-5.1.6 to php-5.3.3 using YUM on CentOS/Fedora/RHEL. Today we shall see how to Install/Upgrade php to...How to generate x509 SHA256 hash self-signed certificate using OpenSSL
For one of my project using OpenCA, i had to migrate from sha1 to sha2. Firstly i should find the...How to install Oracle VirtualBox on Oracle Linux/Fedora/RHEL/CentOS using YUM
Last week we saw how to install VirtualBox on Windows. VirtualBox is available for various flavours of Linux. Today we...Enable automatic updates of nginx using yum repository for RHEL/CentOS distributions
nginx spelled as “Engine X” is an HTTP and reverse proxy server, as well as a mail proxy server, written...How to install, configure and run WordPress 3.8 on RHEL/CentOS/Fedora
Millions of beautiful websites and blogs are powered by WordPress due to its SEO friendly feature. Started off in 2003...Your PHP installation appears to be missing the MySQL extension which is required by WordPress.
While setting up wordpress 3.8, accessing through web browser, i ran into the following error: Your PHP installation appears to...[Linux]: How to forcefully upgrade php from 5.1.6 to 5.3.3 using yum on CentOS/Fedora/RHEL
Recently was installing wordpress 3.8 for a client on a Linux machine with CentOS distribution. The sytem had PHP 5.1.6...PHP configure error: xml2-config not found. Check libxml2 installation on CentOS/RHEL/Fedora
For trying out wordpress 3.8 installation, i had to upgrade my php installation from 5.1.6 to 5.2.4 or later version....How to install mod_pagespeed module for Apache in RHEL, CentOS and Fedora using YUM
Apache’s prime strength is its customizability and flexibility. Apache comes with the support for a large number of modules to perform...How to Encrypt and Decrypt files/folders in Linux using GnuPG
Recently one of our reader had a question : “How to encrypt and decrypt few files/folders in Linux preferably CLI...[Linux]: How to setup LogWatch on CentOs/RHEL/Fedora to monitor System Logs
Most of the system administrators find it most difficult in monitoring their system and keep it secured. I must say...