linux kernel
linux内核组成部分：核心文件、模块文件
grub]# ls /boot/
grub]# ls /boot/
config-3.10.0-123.el7.x86_64
grub
grub2
initramfs-0-rescue-7f28c3a9e20047db9ede37e2b0c3bcfa.img
initramfs-3.10.0-123.el7.x86_64.img
initramfs-3.10.0-123.el7.x86_64kdump.img
initrd-plymouth.img
symvers-3.10.0-123.el7.x86_64.gz
System.map-3.10.0-123.el7.x86_64
vmlinuz-0-rescue-7f28c3a9e20047db9ede37e2b0c3bcfa
vmlinuz-3.10.0-123.el7.x86_64
grub]# ls /lib/modules 模块文件
[root@localhost grub]# ls /lib/modules
3.10.0-123.el7.x86_64
[root@localhost grub]# ls /lib/modules
[root@localhost grub]# ls /lib/modules
3.10.0-123.el7.x86_64
[root@localhost grub]# ls /lib/modules/3.10.0-123.el7.x86_64/
build modules.builtin modules.modesetting source
extra modules.builtin.bin modules.networking updates
kernel modules.dep modules.order vdso
modules.alias modules.dep.bin modules.softdep
modules.alias.bin modules.devname modules.symbols
modules.block modules.drm modules.symbols.bin
[root@localhost grub]# ls /lib/modules/3.10.0-123.el7.x86_64/kernel
[root@localhost grub]# ls /lib/modules/3.10.0-123.el7.x86_64/kernel
arch crypto drivers fs kernel lib mm 内存管理功能 net网络功能 sound 声音相关的驱动程序
[root@localhost grub]# ls /lib/modules/3.10.0-123.el7.x86_64/kernel/fs
[root@localhost grub]# ls /lib/modules/3.10.0-123.el7.x86_64/kernel/fs binfmt_misc.ko cifs exofs fscache isofs mbcache.ko nfsd squashfs btrfs cramfs ext4 fuse jbd2 nfs nls udf cachefiles dlm fat gfs2 lockd nfs_common pstore xfs
Boot Sequence:按次序查找各引导设备，第一个有引导程序的设备即为本次启动要用到的设备。
bootloader : 引导加载器，程序；windows：ntloader;
Linux: LILO: Llnux Loader
MBR: Master Boott Record
446bytes : bootloader
64bytes : fat
2bytes : 55AA
GRUB :
bootloader : 1st stage
partition : filesystem driver.1.5stage
partition : /boot/grub, 2nd stage
init 程序的类型：CentOS 7：Systemd
配置文件： /usr/lib/systemd/system/ , /etc/systemd/system/
[root@localhost etc]# ls /etc/rc.d init.d rc0.d rc1.d rc2.d rc3.d rc4.d rc5.d rc6.d rc.local
[root@localhost etc]# ls /etc/rc.d/rc3.d K50netconsole S10network S20iprinit S20iprupdate S21iprdump k:关闭 S:启动 数字50优先级
1 /etc/rc.d---->/etc/init.d 2 3 [root@localhost etc]# ls /etc/rc.d 4 init.d rc0.d rc1.d rc2.d rc3.d rc4.d rc5.d rc6.d rc.local 5 6 [root@localhost rc.d]# ls /etc/rc.d/init.d = /etc/init.d 7 functions iprdump iprinit iprupdate netconsole network README 8 9 10 11 12 /etc/rc.d 13 [root@localhost etc]# ls -l /etc/rc.d/rc3.d 14 总用量 0 15 lrwxrwxrwx. 1 root root 20 5月 14 19:11 K50netconsole -> ../init.d/netconsole 16 lrwxrwxrwx. 1 root root 17 5月 14 19:11 S10network -> ../init.d/network 17 lrwxrwxrwx. 1 root root 17 5月 14 19:12 S20iprinit -> ../init.d/iprinit 18 lrwxrwxrwx. 1 root root 19 5月 14 19:12 S20iprupdate -> ../init.d/iprupdate 19 lrwxrwxrwx. 1 root root 17 5月 14 19:12 S21iprdump -> ../init.d/iprdump 20 21 /etc/init.d 22 [root@localhost init.d]# ls -l /etc/init.d 23 总用量 44 24 -rw-r--r--. 1 root root 13430 4月 2 2014 functions 25 -rwxr-xr-x. 1 root root 2256 6月 10 2014 iprdump 26 -rwxr-xr-x. 1 root root 2247 6月 10 2014 iprinit 27 -rwxr-xr-x. 1 root root 2269 6月 10 2014 iprupdate 28 -rwxr-xr-x. 1 root root 2989 4月 2 2014 netconsole 29 -rwxr-xr-x. 1 root root 6354 4月 2 2014 network 30 -rw-r--r--. 1 root root 1160 6月 10 2014 README
