What is ...?

In the section ‘What is …?’ concepts are explained related to Linux and Linux security. The goal is to provide a basic definition of each term with references where to read more about the subject.

Articles for What is ...?

What is a kernel ring buffer?

The kernel ring buffer on Linux stores information about important kernel events that can be used by the system administrator to troubleshoot.

What is a monotonic timer?

Monotonic are timers that start at specific events, such as boot or service action. Learn more about monotonic timers and how to related to Linux systems.

What is a security audit?

This article describes what a security audit is and why or when to use it. System audits also apply to Linux systems as part of technical auditing.

What is inter-process communication (IPC)?

Inter-process communication (IPC) provides processes with the capability to communicate with each other, such as signals, pipes, semaphores, and shared memory.

What is run0?

Run0 is a command part of systemd that is intended as an alternative to the sudo command. Both elevate privileges, but are slightly different.

What is SSH?

SSH (secure shell) is a network protocol to provide secure remote access to systems, comes with strong authentication and encrypted data communication.

What is the file /proc/kallsyms on Linux?

The file /proc/kallsysm contains a symbol table from the kernel with function and variable names. Learn about its purpose and security implications.