Systemctl replaces Chkconfig and Service commands in CentOS 7 From our previous experience of CentOS/RedHat, we all knew that “chkconfig“ command is used for checking and updating runlevel information...
How to upgrade OpenSSL v1.0.1e to v1.0.2 on CentOS/RHEL OpenSSL is an open source toolkit that provides tons of functionalities for Secure Socket Layer (SSL) and Transport Layer Security (TLS)...
Upgrade PHP 5.3 to PHP 7.0 using yum on CentOS/RHEL/Fedora My web server was running PHP version 5.3 for a long time and now I would like to en-cash the...
Difference between /bin/false & /sbin/nologin I have seen few system administrators using /sbin/nologin and few use /bin/false to deny shell access to a particular user...
How to Recover/Restore Deleted Post in WordPress? Deleted a post by mistake? Don’t panic. It can happen to anyone and it had happened to me many times....
Fix PHP Error – It is not safe to rely on the system’s timezone settings Do you see this error “It is not safe to rely on the system’s timezone settings” (PHP timezone setting error) ...
WordPress Injected With Spam Links? Diagnose & Protect your site Today my client sent an email stating that his WordPress site has been hacked. After spending few hours in diagnosing...
Fix Unknown collation utf8mb4_unicode_ci [WP Migration] Do you get an error Unknown collation utf8mb4_unicode_ci while migrating your WordPress database? No worries, this tutorial will explain how...
Allow Comments for Older Posts in WordPress Do you like to allow comments for older posts in WordPress? There are situations where you would have disabled comments...
How to Reset WordPress Password via PHPMyAdmin Do you want to reset WordPress password? Well, you can use “Lost your password” link in the WordPress login page. Upon...
How to install LEMP on Ubuntu 14.04 LTS LEMP is a group of open source software stack used to setup web server, database and PHP on a Linux...
Install PHP 7 on a fresh Ubuntu VPS: [Fix] Unable to locate package PHP Recently one of my client provided a fresh VPS and asked me to install PHP 7, Apache and MySQL. While...
How to install PHP 7.1 on GNU/Linux Debian 8.7 (jessie) server? This tutorial will explain how to install PHP and its dependent packages on GNU Linux. If the Linux is installed...
Migrated from http to https? You need to replace image links in WordPress database to avoid mixed content errors If you have migrated your website from HTTP to HTTPS, then you must be prepared to face few hiccups. One...
OpenStack Neutron db_sync error – Cannot add a NOT NULL column with default value NULL [Solved] If you are stuck with an error Cannot add a NOT NULL column with default value NULL while populating or syncing...
OpenStack Error – Index column size too large. The maximum column size is 767 bytes [Solved] If you are getting an error while syncing or populating database of services such as Keystone, Glance, Nova and Neutron, then...
[OpenStack]: from keystoneclient.shell import main ImportError: No module named shell During one node installation of OpenStack Kilo, I tried creating a tenant and the keystone service failed with an error...
Quickly Search and Replace a Text or Image or URL in WordPress Post Contents Do you want to search and replace a particular URL or text or an image in WordPress post contents? For...
What’s the difference between die and exit functions in PHP? One of my students asked me a couple of questions – what is the difference between print and echo (which...