chkconfig

Format: service <service>

Print the specified service the command line help.

Format: service <service> start

Starts the specified system services <service>

Format: service stop

Stop the specified system service <service>

Format: service <service> restart

Restart the specified system service <service>, the first stop (stop), and then start (start).

Format: chkconfig - list

View list of system services, and operation of each service level.

Format: chkconfig <service> on

Designated service set to start automatically when booting.

Format: chkconfig <service> off

Set the specified service does not start automatically at boot time .

Format: ntsysv

Full-screen text interface to set whether to automatically start services at boot time.

When you modify a host name, ip address and other information, the network often need to restart to take effect.

[Root @ node34 root] # service network

Usage: / etc / init.d / network {start | stop | restart | reload | status}

[Root @ node34 root] # service network status

Configure devices:

lo eth0

The current active device:

lo eth0

[Root @ node34 root] # service network restart

Shutting down the interface eth0: [OK]

Loopback interface: [OK]

Setting network parameters: [OK]

Pop-up loopback interface: [OK]

Pop-up interface eth0: [OK]

[Root @ node34 root] #

[Root @ node34 root] # service mysql

mysql: unrecognized service

[Root @ node34 root] # service mysqld

Usage: / etc / init.d / mysqld {start | stop | status | condrestart | restart}

[Root @ node34 root] # service mysqld status

mysqld (pid 1638) is running ...

[Root @ node34 root] # service mysqld restart

Stop MySQL: [OK]

Startup MySQL: [determined]

[Root @ node34 root] #

Sample source code showing three service script 　[Root @ web ~] # cat / sbin / service

#! / Bin / sh

. / Etc / init.d / functions

VERSION = "` basename $ 0 `ver. 0.91"

USAGE = "Usage:` basename $ 0 `<option> | - status-all | \

[Service_name [command | - full-restart]] "

SERVICE =

SERVICEDIR = "/ etc / init.d"

OPTIONS =

if [$ #-eq 0]; then

echo "$ {USAGE}"> & 2

exit 1

fi

cd /

while [$ #-gt 0]; do

case "$ {1}" in

- Help |-h | - h *)

echo "$ {USAGE}"> & 2

exit 0

;;

- Version |-V)

echo "$ {VERSION}"> & 2

exit 0

;;

*)

if [-z "$ {SERVICE}"-a $ #-eq 1-a "$ {1}" = "- status-all"]; then

cd $ {SERVICEDIR}

for SERVICE in *; do

case "$ {SERVICE}" in

functions | halt | killall | single | linuxconf | kudzu)

;;

*)

if! is_ignored_file "$ {SERVICE}" \

& & [-X "$ {SERVICEDIR} / $ {SERVICE}"]; then

env-i LANG = "$ LANG" PATH = "$ PATH" TERM = "$ TERM" "$ {SERVICEDIR} / $ {SERVICE}" status

fi

;;

esac

done

exit 0

elif [$ #-eq 2-a "$ {2}" = "- full-restart"]; then

SERVICE = "$ {1}"

if [-x "$ {SERVICEDIR} / $ {SERVICE}"]; then

env-i LANG = "$ LANG" PATH = "$ PATH" TERM = "$ TERM" "$ {SERVICEDIR} / $ {SERVICE}" stop

env-i LANG = "$ LANG" PATH = "$ PATH" TERM = "$ TERM" "$ {SERVICEDIR} / $ {SERVICE}" start

exit $?

fi

elif [-z "$ {SERVICE}"]; then

SERVICE = "$ {1}"

else

OPTIONS = "$ {OPTIONS} $ {1}"

fi

shift

;;

esac

done

if [-x "$ {SERVICEDIR} / $ {SERVICE}"]; then

env-i LANG = "$ LANG" PATH = "$ PATH" TERM = "$ TERM" "$ {SERVICEDIR} / $ {SERVICE}" $ {OPTIONS}

else

echo $ "$ {SERVICE}: unrecognized service"> & 2

exit 1

fi

[Root @ web ~] #

[Root @ web init.d] # cat / etc / init.d / crond

#! / Bin / bash

#

# Crond Start / Stop the cron clock daemon.

#

# Chkconfig: 2345 90 60

# Description: cron is a standard UNIX program that runs user-specified \

# Programs at periodic scheduled times. Vixie cron adds a \

# Number of features to the basic UNIX cron, including better \

# Security and more powerful configuration options.

# Processname: crond

# Config: / etc / crontab

# Pidfile: / var / run / crond.pid

# Source function library.

. / Etc / init.d / functions

. / Etc / sysconfig / crond

t = $ {CRON_VALIDATE_MAILRCPTS:-UNSET}

["$ T"! = "UNSET"] & & export CRON_VALIDATE_MAILRCPTS = "$ t"

# See how we were called.

prog = "crond"

start () {

echo-n $ "Starting $ prog:"

if [-e / var / lock / subsys / crond]; then

if [-e / var / run / crond.pid] & & [-e / proc / `cat / var / run / crond.pid`]; then

echo-n $ "cannot start crond: crond is already running.";

failure $ "cannot start crond: crond already running.";

echo

return 1

fi

fi

daemon crond $ CRONDARGS

RETVAL = $?

echo

[$ RETVAL-eq 0] & & touch / var / lock / subsys / crond;

return $ RETVAL

}

stop () {

echo-n $ "Stopping $ prog:"

if [!-e / var / lock / subsys / crond]; then

echo-n $ "cannot stop crond: crond is not running."

failure $ "cannot stop crond: crond is not running."

echo

return 1;

fi

killproc crond

RETVAL = $?

echo

[$ RETVAL-eq 0] & & rm-f / var / lock / subsys / crond;

return $ RETVAL

}

rhstatus () {

status crond

}

restart () {

stop

start

}

reload () {

echo-n $ "Reloading cron daemon configuration:"

killproc crond-HUP

RETVAL = $?

echo

return $ RETVAL

}

case "$ 1" in

start)

start

;;

stop)

stop

;;

restart)

restart

;;

reload)

reload

;;

status)

rhstatus

;;

condrestart)

[-F / var / lock / subsys / crond] & & restart | |:

;;

*)

echo $ "Usage: $ 0 {start | stop | status | reload | restart | condrestart}"

exit 1

esac

[Root @ web init.d] #