Bài giảng Quản trị Linux: Service and boot loader management - Đặng Thanh Bình

Bài giảng Quản trị Linux: Service and boot loader management. nội dung chính trong chương này gồm có: Boot sequence, runlevels, bootloader configurationm, what is the “init system”? System V, upstart, systemd. Mời các bạn cùng tham khảo.
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Bài giảng Quản trị Linux: Service and boot loader management - Đặng Thanh BìnhĐặng Thanh BìnhService and Boot LoaderManagementContents•••••••Boot sequenceRunlevelsBootloader configurationWhat is the “init system”?System VUpstartsystemdBOOT SEQUENCEBoot phases• BIOS performs integrity checks on memory andseeks instructions on the Master Boor Record(MBR).• The MBR points to the boot loader (GRUB or LILO).• Boot loader– asks for the OS label which will identify whichkernel to run and where it is located (hard driveand partition specified).– loads the Linux operating system.• The kernel executes init program(SysV/Upstart/Systemd)Boot phases• SysV–The first processes that init starts is a script/etc/rc.d/rc.sysinit–Based on the appropriate run-level, scripts are executedto start various processes to run the system and make itfunctional.• Upstart: Some core boot tasks started by upstart are–Plymouth - The graphical boot animation and logger–mountall - Mounts all filesystems defined on /etc/fstab–network* - Network related services–Display Manager (GDM,KDM,XDM,...)