![]() ![]() sbin/initParent process of all user space programs, always PID of 13 main initialization processes.********************Initialization Process 1*****************System V init:Based on run levels2 Primary components/etc/inittab file-determines the initial runlevel for the system to boot into.-runlevel determined by initdefault option-application run for applicable runlevelsless/etc/inittabbootscripts-/etc/init.d/rc-Script that runs Start and Kill scripts out of applicable rc foldero file /etc/init.d/rco less /etc/init.d/rc*********************Initialization Process 2*******************System D-Initiated in 2010 to create a service manager for Linux-Includes device management (udevd) and logging (journald)-/sbin/init symbolically linked to /lib/systemd/systemdo runs the /etc/systemd/default.target which is a symbolically link to desired initial traget in /lib/systemd/systemo target creates a dependency tree which calls other target scriptso multiple systemd programs available to handle-uses the terms targets and unitso target is essentially equivalent to runlevelo unit is essentially equivalent to daemon (service)*******************Initialization Process 3*********************-upstarto Created for Ubuntu desktops (Ubuntu 15.04+ are systemd)o Event driven, starts jobs based on eventso Configuration files for jobs kept in /etc/init/o Continuous monitoring of the system after startup ![]()
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