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Each time you start your system, it reads a series of startup commands from system initialization files located in your /etc/rcd directory These initialization files are organized according to different tasks Some are located in the /etc/rcd directory itself, while others are located in a subdirectory called initd You should not have to change any of these files The organization of system initialization files varies among Linux distributions Some of the files you find in /etc/rcd are listed in Table 21-1
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rcsysinit and rclocal
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The /etc/rcd/rcsysinit file holds the commands for initializing your system, including the mounting and unmounting of your file systems The /etc/rcd/rclocal file is the last initialization file executed You can place commands of your own here When you shut down your system, the system calls the halt file, which contains shutdown commands The files in initd are then called to shut down daemons, and the file systems are unmounted halt is located in the initd directory
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Files and Directories /etc/sysconfig /etc/rcd /etc/rcd/rcsysinit /etc/initd/rclocal
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Description Directory that holds system configuration files and directories Directory that holds system startup and shutdown files Initialization file for your system Initialization file for your own commands; you can freely edit this file to add your own startup commands; this is the last startup file executed Directory that holds network scripts to start up network connections Directories for different runlevels, where num is the runlevel The directories hold links to scripts in the /etc/initd directory Directory that holds system service scripts (see Table 21-2) Operations performed each time you shut down the system, such as unmounting file systems; called rchalt in other distributions
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/etc/initd /etc/rcd/rcnumd /etc/initd /etc/initd/halt
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TABLE 21-1
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System Files and Directories
/etc//initd
The /etc/initd directory is designed primarily to hold scripts that start up and shut down different specialized daemons, such as network and printer daemons and those for font and web servers These files perform double duty, starting a daemon when the system starts up and shutting down the daemon when the system shuts down The files in initd are designed in a way to make it easy to write scripts for starting up and shutting down specialized applications They use functions defined in the functions file Many of these files are set up for you automatically You shouldn t need to change them If you do change them, first be sure you know how these files work When your system starts up, several programs are automatically started and run continuously to provide services, such as a website or print servers Depending on what kind of services you want your system to provide, you can add or remove items in a list of services to be started automatically For example, the web server is run automatically when your system starts up If you are not hosting a website, you have no need for the web server You can prevent the service from starting, removing an extra task the system does not need to perform, freeing up resources, and possibly reducing potential security holes Several of the servers and daemons perform necessary tasks The sendmail server enables you to send messages across networks, and the cupsd server performs printing operations To configure a service to start up automatically at boot, you can use a distribution startup configuration tools Red Hat and similar distributions like SUSE and Fedora use chkconfig, whereas Debian and its similar distributions like Ubuntu use rrconf or sysv-rc-conf tools The chkconfig command uses the on and off options to select and deselect services for startup at boot (see later in this chapter)
chkconfig httpd on
21:
Managing Services
For Linux distributions that support SysV Init scripts, you can use the service command to start and stop services manually at any time With the service command, you list the service with the stop argument to stop it, the start argument to start it, and the restart argument to restart it
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