制作nginx启停脚本

1.条件：

启动服务命令/application/nginx/sbin/nginx
停止服务命令/application/nginx/sbin/nginx -s stop
实现/etc/init.d/nginxd {start|stop|restart}，并可chkconfig开机自起

2.思路：

1）nginx启动成功会有一个PID文件，所以根据判断该文件是否存在来确定nginx是开启还是关闭状态
2）通过脚本传入参数start或stop，通过case语句取值判断
3）为了专业，调用系统函数库的action函数
4）对函数及命令允许的返回值进行处理，是脚本看起来更专业、规范
5）通过chkconfig来管理nginx脚本，实现开机自启动

3.脚本

cat /etc/init.d/nginxd

#!/bin/sh
# chkconfig: 2345 40 98
# description: Start/Stop Nginx server
path=/application/nginx/sbin
pid=/application/nginx/logs/nginx.pid
RETVAL=0
. /etc/init.d/functions
start(){
    if [ ! -f $pid ];then
        $path/nginx
        RETVAL=$?
        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
}
stop(){
    if [ -f $pid ];then
        $path/nginx -s stop
         RETVAL=$?
        if [ $RETVAL -eq 0 ];then
            action "nginx is stopped" /bin/true
            return $RETVAL
        else
            action "nginx is stopped" /bin/false
            return $RETVAL
        fi
    else
        echo "nginx is no running"
        return $RETVAL
    fi
}
 
case "$1" in
    start)
        start
        RETVAL=$?
        ;;
    stop)
        stop
        RETVAL=$?
        ;;
    restart)
         stop
             sleep 1
         start
         RETVAL=$?
         ;;
    *)
         echo $"Usage: $0 {start|stop|restart|reload}"
         exit 1
esac
exit $RETVAL

chomod +x /etc/init.d/nginxd

参考脚本
linux系统内部有很多值得学习的参考的脚本，空了请研究如下脚本
- /etc/init.d/rpcbind
- /etc/init.d/functions
- /etc/rc.d/rc.sysinit

添加删除openvppn用户的脚本

1.实现要求

1) 命令用法：

实现通过传参的方式往/etc/openvpn_authfile.conf里添加用户
USAGE: sh adduser {-add|-del|-search} username

2) 传参要求：

-add 表示添加后面接的用户名
-del 表示删除后面接的用户名
-search 表示查找后面接的用户名

3) 细节要求

如果用户存在则不能添加，不存在则不能删除，查找结果要给用户明确提示
/etc/openvpn_authfile.conf不能被所有外部用户直接删除及修改

2.具体脚本

cat /server/scripts/b8.sh

#!/bin/bash
. /etc/init.d/functions
FILE_PATH=/etc/openvpn_authfile.conf
[ -f $filepath ] || touch $filepath
usage(){
    echo "usage:`basename $0` {-add|-del|-search} username"
}
if [ $UID -ne 0 ]
  then
    echo "you are not root,must use root"
    exit 1
fi
if [ $# -ne 2 ]
  then
  usage
  exit 2
fi
case "$1" in
  -add|-a)
    shift	#位置参数左移，$2替换$1
    if grep "^$1$" ${FILE_PATH} >/dev/null 2>&1
      then
        action $"vpnuser,$1 is exist" /bin/false
        exit
    else
        chattr -i ${FILE_PATH}
        /bin/cp ${FILE_PATH} ${FILE_PATH}.$(date +%F%T)
        echo "$1" >>${FILE_PATH}
        [ $? -eq 0 ] && action $"add $1" /bin/true
        chattr +i ${FILE_PATH}
    fi
    ;;
  -d|-del)
    shift
    if [ `grep "\b$1\b" ${FILE_PATH}|wc -l` -lt 1 ]
      then
        action $"vpnuser,$1 is not exist" /bin/false
        exit
      else
        chattr -i ${FILE_PATH}
        /bin/cp ${FILE_PATH} ${FILE_PATH}.$(date +%F%T)
        sed -i "/^${1}$/d" ${FILE_PATH}
        [ $? -eq 0 ] && action $"DEL $1" /bin/true
        chattr +i ${FILE_PATH}
        exit
      fi
      ;;
  -s|-search)
    shift
    if [ `grep -w "$1" ${FILE_PATH}|wc -l` -lt 1 ]
      then
        echo $"vpnuser,$1 is no exist."
        exit
    else
        echo $"vpnuser,$1 is  exist."
        exit
    fi
    ;;
    *)
    usege
    exit
    ;;
esac