Linux kernel compilation and system cut (sysctl kernel module Management screen generation INITRD

Linux Components :

Core/boot/vmlinuz-version

Kernel module:/lib/modules/version

Kernel design:

Single Core

Modular design

Micro-core

Load Module Command :

Insmod

Modprobe

Pseudo File System:

/proc

/proc/sys: Many of the files in this directory are readable and writable

/sys

Some files can be written

To set kernel parameter values:

1. Echo VALUE >/proc/sys/to/somefile (restart will fail)

2, sysctl-w Kernel.hostname= "hostname" (restart will expire)

3,/etc/sysctl.conf (permanent), but use the sysctl-p command to make it effective immediately

SYSCTL-A: Show all system parameter values

Kernel module Management

Lsmod: Viewing system modules

Modprobe mod_name: Loading module

Modprobe-r mod_name: Uninstalling a module

Modinfo mod_name: View specific information about the module

Insmod/path/to/modules_file: Load Module

Rmmod mod_name: Removing modules

Depmod/path/to/modiles_dir: Generating a dependency on a module

Functions in the kernel, in addition to the core functions, at compile time, most of the features have three options:

1. Do not use this function

2. Compile into kernel module

3. Compile into kernel

How to manually compile the kernel:

Make Gconfig:gnome desktop environment use (need to install the Graphics Development Library Environment Group: GNOME Software development)

Make KCONFIG:KDE desktop environment (need to install graphical development Library environment)

Make Menuconfig

Make Modules_install

Make install

Two compile-time cleanup, and if necessary, back up the configuration file. config:

Make clean: Cleans up previously compiled binary modules

Make Mrproper: Clean up the remaining work of the compilation, including the. config

Screen command:

Screen-ls: Display the established screen

Screen: Open a new display directly

Screen-r ID: Restore a screen

Ctrl+a,d: Removing a screen

Generate INITRD or Initramfs

rhel5\6:mkinitrd,mkinitrd/boot/initrd-' uname-r ' uname-r '

MKINITRD initrd file path kernel version number

Rhel6:dracut

Linux kernel compilation and system cut (sysctl kernel module Management screen generation INITRD