阿里云配置安全组后，仍无法访问端口问题

ubuntu的ufw如何开放特定端口?
1.安装

sudo apt-get install ufw

2.开启

sudo ufw enable 

默认关闭外部访问

sudo ufw default deny

3.查看状态

$ sudo ufw status 
WARN: uid is 0 but '/etc' is owned by 755
Status: active

To                         Action      From
--                         ------      ----
22                         ALLOW       Anywhere
443                        ALLOW       Anywhere
3306                       ALLOW       Anywhere
11211                      ALLOW       Anywhere
3690                       ALLOW       Anywhere
53                         ALLOW       Anywhere
10000                      ALLOW       Anywhere
8082                       ALLOW       Anywhere
6379/tcp                   ALLOW       Anywhere
6636                       ALLOW       Anywhere
5005                       ALLOW       Anywhere
18761                      ALLOW       Anywhere
9161                       ALLOW       Anywhere

看你的服务端口在列表里面没，没有的话，说明防火墙过滤掉了

4.新增端口

sudo ufw allow 8080

5.删除端口

sudo ufw delete allow 8080

6.允许特定来源的ip地址访问

sudo ufw allow from 192.168.1.1