使用shell编写服务启动脚本

1. 安装nginx

首先在官网获得nginx的安装包

tar zxf nginx-1.16.1.tar.gz
cd nginx-1.16.1/
yum install gcc zlib zlib-devel openssl-devel -y	#解决依赖性
./configure --prefix=/usr/local/nginx
make && make install

当看到Makefile和objs时说明安装成功

2. 启动和关闭nginx

/usr/local/nginx/sbin/nginx 			#启动
/usr/local/nginx/sbin/nginx -s stop		#关闭
netstat -antlpe | grep nginx |wc -l		#查看端口状态（0表示关闭，1表示开启）

3. 服务启动脚本的编写

vim /etc/init.d/nginxd

脚本内容：

#!/bin/bash
. /etc/init.d/functions		#加载系统函数库
path=/usr/local/nginx/sbin	#设定nginx启动命令路径
function start() {
	if [ `netstat -antlpe | grep nginx | wc -l` -eq 0 ]	#如果等于0
	then
		$path/nginx					#打开nginx
		RETVAL=$?
		if [ $RETVAL -eq 0 ]
		then
			action "nginx is started" /bin/true
			return $RETVAL
		else
			action "nginx is started" /bin/false
			return $RETVAL
		fi
	else
		echo "nginx is running"
		return 0
	fi
}

function stop() {
	if [ `netstat -antlpe | grep nginx | wc -l` -ne 0 ]	#如果不等于0
	then
		$path/nginx -s stop
		RETVAL=$?
		if [ $RETVAL -eq 0 ]
		then
			action "nginx is stoped" /bin/true
			return $RETVAL
		else
			action "nginx is stoped" /bin/false
                        return $RETVAL
                fi
	else
		echo "nginx is stoped"
		return 0
	fi
}

case "$1" in		#通过特殊参数$1接收脚本参数的字符串
	start)
	start
	;;
	stop)
	stop
	;;
	restart)
	stop
	sleep 1
	start
	;;
	*)
	echo $"usage: $0 {start | stop | restart}"
	exit 1
esac
exit $RETVAL

给它加上执行权限：

chmod +x /etc/init.d/nginxd

测试：


专业的执行方式为：