A kernel module is a piece of code that can be loaded into the kernel of an operating system to extend its functionality without the need to reboot the system. Kernel modules can provide additional features such as device drivers, file systems, or system calls. They allow for dynamic loading and unloading, which means that you can add or remove functionality as needed while the system is running.
Key characteristics of kernel modules include:
- Dynamic Loading: Modules can be loaded and unloaded at runtime.
- Isolation: They run in kernel space, which allows them to interact directly with hardware and system resources.
- Modularity: They help keep the kernel lightweight by allowing only necessary components to be loaded.
Common commands for managing kernel modules in Linux include insmod (to insert a module), rmmod (to remove a module), and lsmod (to list currently loaded modules).
