What is a Linux kernel module?

A kernel module (or loadable kernel mode) is an object file that contains code that can extend the kernel functionality at runtime (it is loaded as needed); When a kernel module is no longer needed, it can be unloaded. Most of the device drivers are used in the form of kernel modules.

Why is a module not being loaded in Linux?

A module will not be loaded if the “vermagic” string contained within the kernel module does not match the value of the currently running kernel. If it is known that the module is compatible with the current running kernel the “vermagic” check can be ignored with modprobe –force-vermagic .

How to display kernel messages in Linux?

To display kernel messages, you can use the dmesg command or inspect the logs: Compiling a kernel module differs from compiling an user program. First, other headers should be used. Also, the module should not be linked to libraries.

Where are the kernel modules located on a virtual machine?

The modules are placed in /home/root/skels/kernel_modules/ . Alternatively, we can copy files via scp, in order to avoid restarting the VM. For additional details about connecting to the VM via the network, please check Connecting to the Virtual Machine.