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A server that starts automatically and runs continuously is referred to as a standalone server The SysV Init procedure can be used to start servers automatically whenever your system boots This procedure uses service scripts for the servers located in the /etc/initd directory Most Linux systems configure the web server to start automatically and to run continuously by default A script for it called httpd is in the /etc/initd directory
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xinetd Servers
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To start the server only when a request for its services is received, you configure it using the xinetd daemon If you add, change, or delete server entries in the /etc/xinetd files, you will have to restart the xinetd daemon for these changes to take effect On distributions that support SysV Init scripts, you can restart the xinetd daemon using the /etc/initd/xinetd script with the restart argument, as shown here:
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# service xinetd restart
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You can also use the xinetd script to start and stop the xinetd daemon Stopping effectively shuts down all the servers that the xinetd daemon manages (those listed in the /etc/xinetdconf file or the xinetdd directory)
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# service xinetd stop # service xinetd start
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You can also directly restart xinetd by stopping its process directly To do this, you use the killall command with the -HUP signal and the name xinetd
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# killall -HUP xinetd
Service Management: chkconfig, services-admin, rrconf, sysv-rc-conf, and update-rcd
Though there is no distribution-independent tool for managing servers, most distributions use the chkconfig ,services-admin (GNOME), rrconf (Debian), sysv-rc-conf, or update-rcd tools The chkconfig tool was developed by Red Hat and is used on Red Hat, Fedora, and SUSE, and similar distributions, whereas rrconf and update-rcd were developed by Debian and are used on Debian, Ubuntu, and similar distributions The sysv-rc-conf tool is a generic tool that can be used on all distributions The services-admin tool is part of GNOME system tools and is available for all distributions The tools provide simple interfaces you can use to choose what servers you want started up and how you want them to run You use these tools to control any daemon you want started up, including system services such as cron, the print server, remote file servers for Samba and NFS, authentication servers for Kerberos, and, of course, Internet servers for FTP or HTTP Such daemons are referred to as services, and you should think of these tools as managing these services Any of these services can be set up to start or stop at different runlevels If you add a new service, chkconfig, services-admin, rcconf, or sysv-rc-conf can manage it As described in the following section, services are started up at specific runlevels using service links in various runlevel directories These links are connected to the service scripts in the initd directory Runlevel directories are numbered from 0 to 6 in the /etc/rcd directory, such as /etc/rcd/rc3d for runlevel 3 and /etc/rcd/rc5d for runlevel 5 Removing a service from a runlevel only changes its link in the corresponding runlevel rcd directory It does not touch the service script in the initd directory
chkconfig
You can specify the service you want to start and the level you want to start it at with the chkconfig command Unlike other service management tools, chkconfig works equally well on standalone and xinetd services Though standalone services can be run at any runlevel, you can also turn xinetd services on or off for the runlevels that xinetd runs in Table 21-4 lists the different chkconfig options
Listing Services with chkconfig
To see a list of services, use the --list option A sampling of services managed by chkconfig is shown here The on or off status of the service is shown at each runlevel, as are xinetd services and their statuses:
PART VI
chkconfig -list dhcpd 0:off 1:off httpd 0:off 1:off named 0:off 1:off lpd 0:off 1:off
2:off 2:off 2:off 2:on
3:off 3:off 3:off 3:on
4:off 4:off 4:off 4:on
5:off 5:off 5:off 5:on
6:off 6:off 6:off 6:off
Part VI:
Internet and Network Services
Option --level runlevel --list service
Description Specifies a runlevel to turn on, turn off, or reset a service Lists startup information for services at different runlevels xinetd services are just on or off With no argument, all services are listed, including xinetd services Adds a service, creating links in the default specified runlevels (or all runlevels, if none are specified) Deletes all links for the service (startup and shutdown) in all runlevel directories Turns a service on, creating a service link in the specified or default runlevel directories Turns a service off, creating shutdown links in specified or default directories Resets service startup information, creating default links as specified in the chkconfig entry in the service s initd service script
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