Daniel Cao

Linux file system is generally a built-in layer of a Linux operating system used to handle the data management of the storage. It controls how data is stored and retrieved. It manages the file name, file size, creation date, and…

fsck is a front-end program and it calls the respective program for the specific filesystem to run. Fsck usually runs after the system fails to boot, the file system becomes corrupted, or the attached drive fails to function properly. When…

On a Linux system, TCP ports in a reserved range (typically less than 1024) can only be bound by processes with root privilege. If we’re trying to bind a port in a Linux environment less 1024, we will receive a…

Security-Enhanced Linux (SELinux) is a security architecture for Linux® systems that allows administrators to have more control over who can access the system. It was originally developed by the United States National Security Agency (NSA) as a series of patches…

Postfix is a popular open-source mail transfer agent (MTA) that routes and delivers email. Occasionally, as part of the administration of this service, users will view, flush, and purge Postfix mail queues. These actions facilitate the manipulation of email delivery,…

The load average is the average system load on a Linux server for a defined period of time. In other words, it is the CPU demand of a server that includes sum of the running and the waiting threads. In…