linux系統管理（1）之 核心編譯選項檢視
三個方法
- proc檔案系統
- ubunut debain
- 紅帽等
proc檔案系統
/proc/config.gz
This file shows you the compile-time configuration settings for the kernel (gzip compressed, use zcat or zless to see its contents). It is available only if you enable it using CONFIG_IKCONFIG_PROC when you compile.
Say you want to upgrade to the next available kernel. Your current kernel works fine, so you'd like to use the same parameters, but you accidentally lost your original .config configuration file. Simplyzcat /proc/config.gz > /usr/src/linux/.config and you're ready to go.
Example output:
Automatically generated make config: don't edit
Linux kernel version: 2.6.17
Sat Jul 15 17:01:24 2006
CONFIG_X86_32=y
CONFIG_SEMAPHORE_SLEEPERS=y
CONFIG_X86=y
CONFIG_MMU=y
CONFIG_GENERIC_ISA_DMA=y
CONFIG_GENERIC_IOMAP=y
CONFIG_GENERIC_HWEIGHT=y
CONFIG_ARCH_MAY_HAVE_PC_FDC=y
CONFIG_DMI=y
#zcat /proc/config.gz 需要開啟核心配置項CONFIG_IKCONFIG才會生成這個檔案
ubuntu
檔案下檢視
/usr/src/linux-headers-VERSION-generic/.config- 從系統/boot目錄下獲取
[[email protected] ~]# uname -r 4.9.77 [[email protected] ~]# ls /boot/ config-4.9.77-30.el7.x86_64 System.map grub System.map-4.9.77 grub2 System.map-4.9.77-30.el7.x86_64 initramfs-0-rescue-d5e5083a18b24f4db74d0c0f71770f64.img System.map-4.9.77.old initramfs-4.9.77.img vmlinuz initramfs-4.9.77kdump.img vmlinuz-0-rescue-d5e5083a18b24f4db74d0c0f71770f64 initrd-plymouth.img vmlinuz-4.9.77 symvers-4.9.77-30.el7.x86_64.gz
3.從系統/usr/src/kernel目錄下獲取
[[email protected] ~]# uname -r
4.9.77
[[email protected] ~]# cd /usr/src/kernels
[[email protected] kernels]# ls
4.9.77-30.el7.x86_64
[[email protected] kernels]# cd 4.9.77-30.el7.x86_64/
[[email protected] 4.9.77-30.el7.x86_64]# ls -a
. block .config drivers include Kconfig Makefile net security tools
.. certs .config.old firmware init kernel mm samples sound usr
arch config crypto fs ipc lib Module.symvers scripts System.map virt如上所示，當前核心的編譯配置檔案為：.config