Understanding firewall concepts in CentOS 7

Operating system security generally follows a defense in depth model, where security is implemented at different layers in the system. Starting from policies and procedure, physical controls, network perimeter security, host security, application security, and so on,...

Understanding SELinux concepts – CentOS

SELinux is an additional layer of security to protect the system. The permission set by users manually is a kind of security control that works at the user’s discretion, while SELinux is a mandatory access control for securing the system. Its main role is to...

Understanding system logging in CentOS

Most application programs and the kernel write their event information in log files maintained at different locations. It helps in keeping track of activities that are taking place on the system and also forms an essential part of system auditing. Monitoring of log...

Creating custom repositories for CentOS

Creating a YUM repository is one of the easiest and best ways to install software or security updates on multiple systems over LAN. We can download all the packages from the internet repository or from the DVD and host them on the local server, which will be known as...