Ortiz is taking the RHEL LFCS Exam in 2 weeks. What should he have memorized about the Linux kernel. Please list as many items as you can think of.
Sure, here are some of the key concepts and commands related to the Linux kernel that Ortiz should be familiar with for the RHEL LFCS exam:
The Linux kernel is the core component of the Linux operating system that manages system resources such as the CPU, memory, and input/output devices.
The kernel provides an interface between the hardware and software layers of the system and provides essential services such as process management, network communication, and file system access.
The kernel is highly modular and can be customized and configured to meet the specific needs of different systems and environments.
Key kernel components include the scheduler, memory management, process management, network stack, and file system.
The kernel can be configured and recompiled to include or exclude specific features, drivers, and modules.
The most common way to interact with the kernel is through system calls, which provide a standardized interface for applications to access kernel services.
The uname command can be used to display information about the running kernel, such as its version and release.
The modprobe command is used to load and unload kernel modules.
The lsmod command can be used to display information about currently loaded kernel modules.
The dmesg command can be used to display messages generated by the kernel during system boot-up and hardware detection.
The sysctl command can be used to view and modify kernel parameters at runtime.
The /proc and /sys file systems provide a virtual interface to kernel data structures and can be used to view and modify kernel settings.
Kernel panic is a critical error condition that can occur when the kernel encounters a problem that it cannot recover from.
The kernel can be updated through package managers such as yum and dnf, or by manually compiling and installing a new version of the kernel.
Understanding kernel parameters such as kernel.sysrq, kernel.core_uses_pid, kernel.exec-shield, and kernel.randomize_va_space is important for securing and optimizing the system.
These are just some of the key concepts and commands related to the Linux kernel that Ortiz should be familiar with for the RHEL LFCS exam.