Chapter 3: Server Initialization and Shutdown
Chapter contents
This chapter describes various maintenance aspects of servers and their troubleshooting, including:
●Server initialization
●System shutdown
Server initialization
After a server is powered on, software/firmware modules are executed in the following order:
1.BIOS — The BIOS (Basic Input/Output System) takes control of the server’s CPU and provides several services including:
●Running diagnostics on the server’s hardware (processor, memory, disk, etc.).
●Reading the
2.LILO — The Linux loader (LILO) reads the Linux kernel from the boot disk and transfers control to it. Phase 1 of LILO was read into memory by the BIOS. When Phase 1 begins executing, it reads in the rest of the LILO program, including the Linux kernel’s location. LILO reads in the Linux kernel, uncompresses it, and transfers control to it.
3.Linux Kernel — The Linux kernel initializes the CPU’s registers, initializes its own data structures, determines the amount of available memory, initializes the various
4.Init — The init process creates the remaining processes for the system using the /etc/ inittab file, which specifies runlevels, and a set of processes to run at each runlevel. During this step, the SSG application and database are started.
The rc script runs the service startup scripts in /etc/rc.d/rc4.d in numeric order (S00* through S99*). Each of these startup scripts starts a particular Linux service (e.g., inetd). In addition to starting up the various services, the disk partitions are checked for sanity, and loadable modules are loaded.
Note:
Use the Linux command statapp to view the status of the applications.
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