Chapter 8 . Understanding the Boot Process 311 (Web hosting services)
Chapter 8 . Understanding the Boot Process 311 This line cancels the restart if the UPS detects that power has been restored. 1:2345:respawn:/sbin/mingetty tty1 2:2345:respawn:/sbin/mingetty tty2 3:2345:respawn:/sbin/mingetty tty3 4:2345:respawn:/sbin/mingetty tty4 5:2345:respawn:/sbin/mingetty tty5 6:2345:respawn:/sbin/mingetty tty6 The /sbin/mingetty processes are started for runlevels 2 through 5. These provide the standard login consoles and are respawned each time they are terminated. x:5:respawn:/etc/X11/prefdm -nodaemon This line starts the graphical login processes for runlevel 5. Customizing the Boot Process The process that initfollows when it brings the system up is laid out exactly in the /etc/inittabfile. But this file does not tell the whole story; it only launches other scripts that handle most of the tasks. Most Linux distributions use many different script files to start the services and processes on the system. There are two different types of startup procedures used today: BSD and Sys V. BSD startup A couple of Linux distributions use the older BSD style of initialization; with the most popular one being Slackware. With BSD initialization the system uses a few long rc (run control) script files to set up and configure the system. These are usually named similar to /etc/rcand /etc/rc.local. The benefit of this setup is that you know where to look for most things, and all of the information is stored in the same place. The problem with BSD-style initialization is that it is harder to quickly customize. In the As the name implies, the BSD variants such as FreeBSD and OpenBSD use this Real World type of startup. Sys V startup Red Hat, its variants, and Debian all use System V initialization, known as Sys V init. This style of startup uses many small script files in a hierarchical directory structure separated into runlevels. The root of this directory tree in Red Hat is /etc/rc.d, while in Debian the root is just in /etc.
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