Linux Learning Notes < 18 >--Kernel compilation

The kernel consists of core and kernel modules

Core:/boot/vmlinuz-version

Kernel module (KO):/lib/modules/version/

View Kernel version

Uname-r

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The major version number. minor version number (even for stable version, odd for test version). Revision number (number of revisions)

User space access, monitoring the kernel is through access to modify the files in the/proc,/sys directory (that is, set the kernel parameter values) implemented

/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/file

echo 1 >/proc/sys/vm/drop_cache empty in-memory buffers and cached

2.sysctl-w kernel.hostname= "Chenqiyi"

Systcl-w vm.drop_cache=1

Sysctl-w net.ipv4.ip_forward=1 One host multi-NIC can be forwarded

The previous two methods can be effective immediately, but not permanently.

3. Modify/etc/sysctl.conf, modify and perform sysctl-p reread configuration file can take effect immediately, and permanently effective

SYSCTL-A: Show all kernel parameters and their values

Kernel Module Management:

Lsmod: Lists the kernel modules used in the current system

Modprobe mod_name: Loading module

Modprobe-r mod_name: Unload module

Modifo mod_name: View specific information about the module

Insmod/path/to/modile_file: Load Module

Rmmod mod_name: Unload module

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

Features in the kernel, in addition to the core functions, at compile time, most of the functions have three choices

1. This feature is not available

2. Programming kernel module (requires loading module)

3. Compiling into the kernel

Compiling the kernel manually

1.yum Groupinstall "Development Tools" "Development Libraries"

2.tar XF kernel file. tar.gz-c/usr/src

3. Configure the kernel, the module is deleted, in the kernel directory

cp/boot/config-' uname-r '/usr/src/kernel directory/.config The original kernel configuration of the system CP has been modified in the past

①make gconfig:gnome desktop environment, need to install the Graphics Development Library Group: GNOME Software Development

②make KCONFIG:KDE desktop environment, need to install graphics development Library

③make Menuconfig

4. After the configuration is complete, execute the make command in the kernel directory to compile the kernel

5.make Modules_install Mounting Module

6.make Install kernel

Screen command:

Screen-ls: Displays the already established screen

Screen: Open a new display directly

CTRL + A release later press D: Remove screen

Screen-r ID: Restore a screen

Exit: Exit

Linux Learning Notes < 18 >--Kernel compilation