.::: Installing OTRS 6 Help Desk and ITSM software on CentOS 7 /Redhat 7 :::.

OTRS (Open source TRouble ticket System) is one of the most popular open source software used for help desk and IT Service Management. You can download, install, modify and use OTRS completely free of cost as it is licensed under the Affero General Public License V3 (AGPL). This article helps you with step-by-step instruction on how to install OTRS software on CentOS 7 Operating system.

Step 1: Update your system (optional)

Before you begin, update all installed packages in your system with the latest version available. Login to the system as root user and run the following command:

.::: How to Hidden BInd Version /DNS Version :::.

Sometimes a new vulnerability is found in DNS software and script kiddies are scanning the Internet to exploit unpatched systems. It's a best practice to hide software version on your DNS servers, although this is not a real protection it just makes a little harder to find your servers via scanning.
Use dig command to find which version is running on your name servers:

1. Verify that bind server is before hidden version
# dig @127.0.0.1 version.bind chaos txt

as example