Error starting userland proxy: listen tcp 0.0.0.0:80: bind: address already in use
今天在阿里的服务器上发现80端口被占用了，优点莫名其妙，一查结果发现是进程aliyundun占用了端口

tcp          100.100.100.200:80      TIME_WAIT   -                   
tcp          100.100.30.25:80        ESTABLISHED 1472/AliYunDun      
tcp          100.100.100.200:80      TIME_WAIT   -          

用kill显示是不允许的操作

[root@lingg ~]# kill 1472
-bash: kill: (1472) - 不允许的操作
[root@lingg ~]# kill -9 1472
-bash: kill: (1472) - 不允许的操作

然后网上找了下解决方案如下

sudo fuser -k 80/tcp

```bash
[root@lingg ~]# sudo fuser -k 80/tcp
80/tcp:               1267  1272  1273  1274

解决