CentOS7下启动Nginx出现Failed to start nginx.service:unit not found

错误的原因就是没有添加nginx服务，所以启动失败。

解决方法：

1.    在/root/etc/init.d/目录下新建文件，文件名为nginx

　　或者用命令在根目录下执行:# vim /etc/init.d/nginx    (注意vim旁边有一个空格)

2.    插入以下代码 

  

   

    

     

    
    

     

      #!/bin/sh
     
    
   

    

     

    
    

     

      # nginx - this script starts and stops the nginx daemin
     
    
   

    

     

    
    

     

      #
     
    
   

    

     

    
    

     

      # chkconfig: - 85 15
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      # description: Nginx is an HTTP(S) server, HTTP(S) reverse \
     
    
   

    

     

    
    

     

      # proxy and IMAP/POP3 proxy server
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      # processname: nginx
     
    
   

    

     

    
    

     

      # config: /usr/local/nginx/conf/nginx.conf
     
    
   

    

     

    
    

     

      # pidfile: /usr/local/nginx/logs/nginx.pid
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      # Source function library.
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      . /etc/rc.d/init.d/functions
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      # Source networking configuration.
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      . /etc/sysconfig/network
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      # Check that networking is up.
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      [ "$NETWORKING" = "no" ] && exit 0
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      nginx="/usr/local/nginx/sbin/nginx"
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      prog=$(basename $nginx)
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      NGINX_CONF_FILE="/usr/local/nginx/conf/nginx.conf"
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      lockfile=/var/lock/subsys/nginx
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      start() {
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

          [ -x $nginx ] || exit 5
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

          [ -f $NGINX_CONF_FILE ] || exit 6
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
    echo -n $"Starting $prog: "
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

          daemon $nginx -c $NGINX_CONF_FILE
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

          retval=$?
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
    echo
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

          [ $retval -eq 0 ] && touch $lockfile
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
    return $retval
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      }
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      stop() {
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
    echo -n $"Stopping $prog: "
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

          killproc $prog -QUIT
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

          retval=$?
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
    echo
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

          [ $retval -eq 0 ] && rm -f $lockfile
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
    return $retval
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      }
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      restart() {
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

          configtest || return $?
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

          stop
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

          start
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      }
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      reload() {
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

          configtest || return $?
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
    echo -n $"Reloading $prog: "
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

          killproc $nginx -HUP
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

          RETVAL=$?
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
    echo
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      }
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      force_reload() {
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

          restart
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      }
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      configtest() {
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
  $nginx -t -c $NGINX_CONF_FILE
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      }
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      rh_status() {
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

          status $prog
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      }
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      rh_status_q() {
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

          rh_status >/dev/null 2>&1
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      }
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      case "$1" in
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

          start)
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

              rh_status_q && exit 0
     
    
   

    

     

    
    

     
        $1
     
    
   

    

     

    
    

     

              ;;
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

          stop)
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

              rh_status_q || exit 0
     
    
   

    

     

    
    

     
        $1
     
    
   

    

     

    
    

     

              ;;
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

          restart|configtest)
     
    
   

    

     

    
    

     
        $1
     
    
   

    

     

    
    

     

              ;;
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

          reload)
     
    
   

    

     

    
    

     

              rh_status_q || exit 7
     
    
   

    

     

    
    

     
        $1
     
    
   

    

     

    
    

     

              ;;
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

          force-reload)
     
    
   

    

     

    
    

     

              force_reload
     
    
   

    

     

    
    

     

              ;;
     
    
   

    

     

    
    

     

          status)
     
    
   

    

     

    
    

     

              rh_status
     
    
   

    

     

    
    

     

              ;;
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

          condrestart|try-restart)
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

              rh_status_q || exit 0
     
    
   

    

     

    
    

     

                  ;;
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

          *)
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
        echo $"Usage: $0 {start|stop|status|restart|condrestart|try-restart|reload|force-reload|configtest}"
     
    
   

    

     

    
    

     
        exit 2
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      esac
     
    
  
 

3. 用命令进入此目录

　　# cd /etc/init.d

4. 依此执行以下命令

# chmod 755 /etc/init.d/nginx

# chkconfig --add nginx   (注意add前面是两个短横线-)

5. 开启nginx

# service nginx start

文章来源: lansonli.blog.csdn.net，作者：Lansonli，版权归原作者所有，如需转载，请联系作者。

原文链接：lansonli.blog.csdn.net/article/details/104579182