linuxexpert-practice-labs/labs/lpic-1/101-1-hardware-settings

LPIC-1 101.1: Hardware settings

Finding the driver behind a device, loading and unloading kernel modules, and blacklisting a module so it doesn't load at boot.

This lab runs on the RHEL family only: the Ubuntu cloud kernel doesn't include the pcspkr module, and Ubuntu blacklists it already.

Before you start

The lab installs pciutils (for lspci) if it's missing, and notes the current boot so it can tell that you rebooted. Write answers to the files in /root/lab-answers/.

Tasks

1. With lspci -k, find the kernel driver in use for the VM's Ethernet controller, and write its name to /root/lab-answers/1.
2. Unload and reload a module that nothing is using, then check dmesg for the messages. loop works if lsmod lists it with nothing in "Used by". Check it yourself: the module is back in lsmod.
3. Add blacklist pcspkr to a file in /etc/modprobe.d/, reboot, and confirm with lsmod that it didn't load. Then load it by hand with modprobe.

Hints

• lspci -k prints "Kernel driver in use" under each device.
• lsmod, modprobe -r, modprobe, dmesg | tail.
• modprobe --showconfig | grep pcspkr; lsmod | grep pcspkr.