问题现象
安装harbor时ERROR: for nginx Cannot start service proxy: driver failed programming external connectivity on endpoint nginx (d55f2dc113ed3cf55606bfb054bf0cee9deec6fe4529e99f2180fddd3d6821e8): Bind for 0.0.0.0:80 failed: port is already allocated
这是因为端口被占用了
可以 docker ps -a 查看哪个占用了这个端口号，stop停止掉或者修改一下就可以了