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echo -n "Starting httpd: " daemon httpd echo touch /var/lock/subsys/httpd
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The killproc function shuts down the daemon. The lock file and the process ID file (httpd.pid) are then deleted.
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killproc httpd echo rm -f /var/lock/subsys/httpd rm -f /var/run/httpd.pid
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The daemon, killproc, and status scripts are shell scripts defined in the functions script also located in the inet.d directory. The functions script is executed at the beginning of each startup script to activate these functions. A list of these functions is provided in Table 22-2.
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. /etc/rc.d/init.d/functions
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The beginning of the startup script holds tags used to configure the server. These tags, which begin with an initial #, are used to provide runtime information about the service to your system. The tags are listed in Table 22-2 along with the startup functions. You enter a tag with a preceding # symbol, the tag name with a colon, and then the tag arguments. For example, the processname tag will specify the name of the program being executed, in this example httpd. Table 22-2: System V init Script Functions and Tags Init Script Function Description daemon [+/-nicelevel] program [arguments] [&] killproc program [signal] Starts a daemon, if it is not already running. Sends a signal to the program; by default it sends a SIGTERM, and if the process doesn't stop, it sends a SIGKILL. It will also remove any PID files, if it can. Used by another function, it determines the PID of a program. Displays status information. Description Required. Specifies the default start levels for this service as well as start and end priorities.
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pidofproc program status program Init Script Tag # chkconfig: startlevellist startpriority endpriority
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# description [ln]: description Required. The description of the service, continued with '\' characters. Use an initial # for any added lines. With the ln of service option, you can specify the language the description is written in. # autoreload: true Optional. If this line exists, the daemon checks its configuration files and reloads them automatically when they change. Optional, multiple entries allowed. Name of the program or daemon started in the script. Optional, multiple entries allowed. Specify a configuration file used by the server. Optional, multiple entries allowed. Specifies the PID file. Optional, used in place of autoreload, processname, config, and pidfile entries to automatically probe and start the service.
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# processname: program # config: configuration-file # pidfile: pid-file # probe: true
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# processname: httpd
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If your script starts more than one daemon, you should have a processname entry for each. For example, the Samba service starts up both the smdb and nmdb daemons.
# processname: smdb # processname: nmdb
The end of the tag section is indicated by an empty line. After this line, any lines beginning with a # are treated as comments. The chkconfig line will list the default runlevels that the service should start up on, along with the start and stop priorities. The following entry lists runlevels 3, 4, and 5 with a start priority of 85 and a stop of 15.
# chkconfig: 345 85 15
With the description you enter a short description of the service, using the \ symbol before a newline to use more than one line. pidfile indicates the file where the server's process ID is held. With config tags, you specify the configuration files the server may use. In the case of the Apache Web server, there may be three configuration files:
# config: /etc/httpd/conf/access.conf # config: /etc/httpd/conf/httpd.conf # config: /etc/httpd/conf/srm.conf
As an example, a simplified version of the Web server startup script is shown here. Most scripts are much more complicated, particularly when determining any arguments or variables a server may need to specify when it starts up. It has the same name as the Web server daemon, httpd. /etc/rc.d/init.d/httpd
#!/bin/sh # # Startup script for the Apache Web Server # # chkconfig: 35 85 15 # description: Apache is a World Wide Web server. It is used to serve \ # HTML files and CGI. # processname: httpd # pidfile: /var/run/httpd.pid # config: /etc/httpd/conf/access.conf # config: /etc/httpd/conf/httpd.conf # config: /etc/httpd/conf/srm.conf # Source function library. . /etc/rc.d/init.d/functions # See how we were called. case "$1" in start) echo -n "Starting httpd: " daemon httpd echo touch /var/lock/subsys/httpd ;; stop) killproc httpd
status) restart)
echo rm -f /var/lock/subsys/httpd rm -f /var/run/httpd.pid ;; status httpd ;; $0 stop $0 start ;; echo -n "Reloading httpd: " killproc httpd -HUP echo ;; echo "Usage: $0 {start|stop|restart|reload|status}" exit 1
reload)
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