Linux命令中service的用法

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用途说明

service命令用于对系统服务进行管理,比如启动(start)、停止(stop)、重启(restart)、查看状态(status)等。
相关的命令还包括chkconfig、ntsysv等,chkconfig用于查看、设置服务的运行级别,ntsysv用于直观方便的设置各个服务是否自动启动。
service命令本身是一个shell脚本,它在/etc/init.d/目录查找指定的服务脚本,然后调用该服务脚本来完成任务。 看看下面的手册页可能更加清楚的了解service的内幕:service运行指定服务(称之为System V初始脚本)时,把大部分环境变量去掉了,
只保留LANG和TERM两个环境变量,并且把当前路径置为/,也就是说是在一个可以预测的非常干净的环境中运行服务脚本。这种脚本保存在/etc/init.d目录中,它至少要支持start和stop命令。 man service 写道 service(8) service(8) NAME service - run a System V init script SYNOPSIS service SCRIPT COMMAND [OPTIONS] service --status-all service --help | -h | --version DESCRIPTION service runs a System V init script in as predictable environment as possible, removing most environment vari- ables and with current working directory set to /. The SCRIPT parameter specifies a System V init script, located in /etc/init.d/SCRIPT. The supported values of COMMAND depend on the invoked script, service passes COMMAND and OPTIONS it to the init script unmodified. All scripts should support at least the start and stop commands. As a special case, if COMMAND is --full-restart, the script is run twice, first with the stop command, then with the start command. service --status-all runs all init scripts, in alphabetical order, with the status command. FILES /etc/init.d The directory containing System V init scripts. ENVIRONMENT LANG, TERM The only environment variables passed to the init scripts. SEE ALSO chkconfig(8), ntsysv(8) Jan 2006 service(8) 常用方式 格式:service
<service> 打印指定服务<service>的命令行使用帮助。 格式:service <service> start 启动指定的系统服务<service> 格式:service <service> stop 停止指定的系统服务<service> 格式:service <service> restart 重新启动指定的系统服务<service>,即先停止(stop),然后再启动(start)。 格式:chkconfig --list 查看系统服务列表,以及每个服务的运行级别。 格式:chkconfig <service> on 设置指定服务<service>开机时自动启动。 格式:chkconfig <service> off 设置指定服务<service>开机时不自动启动。 格式:ntsysv 以全屏幕文本界面设置服务开机时是否自动启动。 使用示例 示例一 网络重启 当修改了主机名、ip地址等信息时,经常需要把网络重启使之生效。 [[email protected] root]# service network 用法:/etc/init.d/network {start|stop|restart|reload|status} [[email protected] root]# service network status 配置设备: lo eth0 当前的活跃设备: lo eth0 [[email protected] root]# service network restart 正在关闭接口 eth0: [ 确定 ] 关闭环回接口: [ 确定 ] 设置网络参数: [ 确定 ] 弹出环回接口: [ 确定 ] 弹出界面 eth0: [ 确定 ] [[email protected] root]# 示例二 重启mysql [[email protected] root]# service mysql mysql: unrecognized service [[email protected] root]# service mysqld 用法:/etc/init.d/mysqld {start|stop|status|condrestart|restart} [[email protected] root]# service mysqld status mysqld (pid 1638) 正在运行... [[email protected] root]# service mysqld restart 停止 MySQL: [ 确定 ] 启动 MySQL: [ 确定 ] [[email protected] root]# 示例三 service脚本源码展示 [[email protected] ~]# 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 [[email protected] ~]# 示例四 crond服务的源码 [[email protected] 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 [[email protected] init.d]# 问题思考 相关资料 【1】测试人生 linux 中不常用的命令--service http://www.51testing.com/?uid-66775-action-viewspace-itemid-78574 【2】linux大棚 《service》-“linux命令五分钟系列”之二 http://roclinux.cn/?p=47 【3】yqh860921 Linux Service 服务管理 http://blogold.chinaunix.net/u3/95470/showart_1934759.html 【4】酷勤 Linux system service 注释 http://www.kuqin.com/linux/20090824/67321.html 【5】momodog 自定义Linux Service http://momodog.iteye.com/blog/286047

 




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