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服务启动脚本编写实践

一、服务启动脚本的编写说明

本文将通过case语句，编写不同服务的启动脚本，并集成开机自启功能。以下是具体实现方法。

二、服务启动脚本的案例

1. Nginx服务启动脚本

#!/bin/bash# 定义服务名称和脚本所在目录SERVICENAME="nginx"SCRIPTDIR="/usr/local/lnmp/nginx/sbin"# 检查是否存在关键库文件if [ -f /etc/init.d/functions ]; then    source /etc/init.d/functionsfi# 定义进程判断文件PIDFILE="/usr/local/lnmp/nginx/logs/nginx.pid"# 定义功能模块start_Nginx() {    if [ -f $PIDFILE ]; then        echo "Nginx is running."    else        echo "Nginx is starting."        $SCRIPTDIR/nginx > /dev/null        /bin/true    fi}stop_Nginx() {    if [ -f $PIDFILE ]; then        echo "Nginx is stopping."        $SCRIPTDIR/nginx -s stop > /dev/null        /bin/true    else        echo "Nginx is already stopped."        /bin/true    fi}restart_Nginx() {    if [ -f $PIDFILE ]; then        echo "Nginx is restarting."        $SCRIPTDIR/nginx -s reopen > /dev/null        /bin/true    else        echo "Failed to start Nginx."        /bin/false    fi}reload_Nginx() {    if [ -f $PIDFILE ]; then        echo "Nginx is reloading."        $SCRIPTDIR/nginx -s reload > /dev/null        /bin/true    else        echo "Failed to reload Nginx."        /bin/false    fi}# case语句实现命令解析case $1 in    start)        start_Nginx        RETVAL=$?        ;;    stop)        stop_Nginx        RETVAL=$?        ;;    restart)        restart_Nginx        RETVAL=$?        ;;    reload)        reload_Nginx        RETVAL=$?        ;;    *)        echo "Usage: $0 {start|stop|restart|reload}"        exit 1    ;;esacexit $RETVAL

2. MySQL服务启动脚本

#!/bin/bash# 定义服务名称和脚本所在目录SERVICENAME="mysql"SCRIPTDIR="/usr/local/mysql/bin"# 定义功能模块start_Mysql() {    if [ -f $PIDFILE ]; then        echo "MySQL is running."    else        echo "MySQL is starting."        $SCRIPTDIR/mysql.server start > /dev/null        /bin/true    fi}stop_Mysql() {    if [ -f $PIDFILE ]; then        echo "MySQL is stopping."        $SCRIPTDIR/mysql.server stop > /dev/null        /bin/true    else        echo "MySQL is already stopped."        /bin/true    fi}restart_Mysql() {    if [ -f $PIDFILE ]; then        echo "MySQL is restarting."        $SCRIPTDIR/mysql.server restart > /dev/null        /bin/true    else        echo "Failed to start MySQL."        /bin/false    fi}# case语句实现命令解析case $1 in    start)        start_Mysql        RETVAL=$?        ;;    stop)        stop_Mysql        RETVAL=$?        ;;    restart)        restart_Mysql        RETVAL=$?        ;;    reload)        echo "MySQL does not support reload."        exit 1        ;;    *)        echo "Usage: $0 {start|stop|restart}"        exit 1    ;;esacexit $RETVAL

3. rsync服务启动脚本

#!/bin/bash# 定义服务名称和脚本所在目录SERVICENAME="rsync"SCRIPTDIR="/usr/bin"# 定义功能模块start_Rsync() {    echo "Rsync is starting."    $SCRIPTDIR/rsyncd --daemon > /dev/null    /bin/true}stop_Rsync() {    echo "Rsync is stopping."    $SCRIPTDIR/rsyncd --stop > /dev/null    /bin/true}# case语句实现命令解析case $1 in    start)        start_Rsync        RETVAL=$?        ;;    stop)        stop_Rsync        RETVAL=$?        ;;    *)        echo "Usage: $0 {start|stop}"        exit 1    ;;esacexit $RETVAL

三、服务自启动配置

四、运行级别管理

五、常用命令

通过以上方法，可以轻松编写不同服务的启动关闭脚本，并实现开机自启动功能。

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