pam_tally2 command – lock & unlock ssh failed logins

Check users login attempts using pam_tally2 command:

How to Enable Passwordless Authentication with SSH

Note: - Node1 is the source and Node2 will be the destination machine.

Add a User and Grant Root Privileges on CentOS 7

Step 1: Add the User

Add new user use the below command:

How to install GNOME Desktop in Centos 6.x.x minimal installation

This blog provides the steps to add the GNOME Desktop to a CentOS minimal installation where the OS was installed without the X Window System/GUI.

How to change max_connections setting in MySQL

Error:  "too many connections"

Solution:The default setting for max_connections is 151.

How to install Bugzilla 4.2 on CentOS 7

Bugzilla is an advanced bug tracking system, developed by the Mozilla Foundation. Bugzilla allows you to track defects and code changes in applications, allow communicating in your dev team easily and submitting and reviewing patches.

How to configure Self-Signed SSL Certificate in Apache HTTP Server

Apache HTTP Server HTTPS secure connection using Self-Signed SSL on Apache.

How to Disable SELinux on CentOS 7

SELinux, or Security-Enhanced Linux, is a set of security modules which are loaded in to kernel to improve security on accessing services/files which improve security. SELinux was initially released as a collaborative between Red Hat and the National Security Agency. The SELinux kernel separates policy and decisions inside the kernel to distribute levels of protection and prevent a total security breach.