UNIX and Linux servers security against hackers or external threats to protect sensitive data is an extremely important step for the enterprises. Linux is secure by default and has in-built security model in place. To make UNIX/Linux servers more secure system, the system administrator can customize them as per his needs. In fact, securing servers from the hands of hackers and crackers is one of the most challenging tasks for a System Administrator. This post highlights some of the best practices that help provide the utmost security level to the UNIX/Linux servers. So, go through it to know those crucial tips.
Turn off unused services
Services which you don’t enable can’t be attacked from the outside. If you don’t provide access to a service, it doesn’t matter if there are any vulnerabilities in the daemon which would provide that service. So, it is better to disable anything you don’t need to use.
Use SSH (Secure Shell)
SSH is a protocol which supports logging into a remote system or executing commands on a remote system, using an encrypted communication between the two systems. Session encryption protects you from unscrupulous packet sniffers who may have access to one of the networks through which the packets between the two hosts may have to travel.
Minimize Software for Minimizing Vulnerability
Do you really need all sort of web services installed? In most of the cases, the answer is No. Avoid installing unnecessary software to avoid vulnerabilities in software. For better security, delete all unwanted packages.
Encrypt data communication over a network
All data transmitted over a network is open to monitoring. So, encrypt transmitted data whenever possible with password or using keys/certificates.
Use Linux security extensions
Linux comes with numerous security patches which can be used to guard against misconfigured or compromised programs. Therefore, it’s better to use security extensions to enforce limitations on network as well as other programs. Security extensions help provide a variety of security policies for Linux kernel.
Restrict access to your server
In the same way that you would not give the keys of your house to just anyone you know, you should not give server access to just someone you know. Once this rule is clear, you can easily restrict access to your precious UNIX/Linux servers. Add more security layers to your server to fend off casual offenders.
Periodically resetting root’s password
Frequently reset the password of root and ensure that it is a good password and almost no one knows what it is. There are better ways available to manage a system than sharing the root password.
Hope, you have gone through and understood all the above-listed best practices for security of the UNIX/Linux servers. Implement all these practices to secure the servers from getting compromised.