urllib3.exceptions.MaxRetryError: HTTPConnectionPool(host=‘localhost‘, port=8097): Max retries excee

问题描述：
使用nohup … > log.txt &命令训练深度学习模型时，输出日志报错Connection to remote host was lost…

相关命令可见我的另一篇博客
如何使用远程linux服务器运行深度学习项目

具体错误：

[Errno 111] Connection refused
Traceback (most recent call last):File "/usr/local/anaconda3/envs/p2p/lib/python3.6/site-packages/urllib3/connection.py", line 170, in _new_conn(self._dns_host, self.port), self.timeout, **extra_kwFile "/usr/local/anaconda3/envs/p2p/lib/python3.6/site-packages/urllib3/util/connection.py", line 96, in create_connectionraise errFile "/usr/local/anaconda3/envs/p2p/lib/python3.6/site-packages/urllib3/util/connection.py", line 86, in create_connectionsock.connect(sa)
ConnectionRefusedError: [Errno 111] Connection refusedDuring handling of the above exception, another exception occurred:Traceback (most recent call last):File "/usr/local/anaconda3/envs/p2p/lib/python3.6/site-packages/urllib3/connectionpool.py", line 706, in urlopenchunked=chunked,File "/usr/local/anaconda3/envs/p2p/lib/python3.6/site-packages/urllib3/connectionpool.py", line 394, in _make_requestconn.request(method, url, **httplib_request_kw)File "/usr/local/anaconda3/envs/p2p/lib/python3.6/site-packages/urllib3/connection.py", line 234, in requestsuper(HTTPConnection, self).request(method, url, body=body, headers=headers)File "/usr/local/anaconda3/envs/p2p/lib/python3.6/http/client.py", line 1287, in requestself._send_request(method, url, body, headers, encode_chunked)File "/usr/local/anaconda3/envs/p2p/lib/python3.6/http/client.py", line 1333, in _send_requestself.endheaders(body, encode_chunked=encode_chunked)File "/usr/local/anaconda3/envs/p2p/lib/python3.6/http/client.py", line 1282, in endheadersself._send_output(message_body, encode_chunked=encode_chunked)File "/usr/local/anaconda3/envs/p2p/lib/python3.6/http/client.py", line 1042, in _send_outputself.send(msg)File "/usr/local/anaconda3/envs/p2p/lib/python3.6/http/client.py", line 980, in sendself.connect()File "/usr/local/anaconda3/envs/p2p/lib/python3.6/site-packages/urllib3/connection.py", line 200, in connectconn = self._new_conn()File "/usr/local/anaconda3/envs/p2p/lib/python3.6/site-packages/urllib3/connection.py", line 182, in _new_connself, "Failed to establish a new connection: %s" % e
urllib3.exceptions.NewConnectionError: <urllib3.connection.HTTPConnection object at 0x7f5bc655ce48>: Failed to establish a new connection: [Errno 111] Connection refusedDuring handling of the above exception, another exception occurred:Traceback (most recent call last):File "/usr/local/anaconda3/envs/p2p/lib/python3.6/site-packages/requests/adapters.py", line 449, in sendtimeout=timeoutFile "/usr/local/anaconda3/envs/p2p/lib/python3.6/site-packages/urllib3/connectionpool.py", line 756, in urlopenmethod, url, error=e, _pool=self, _stacktrace=sys.exc_info()[2]File "/usr/local/anaconda3/envs/p2p/lib/python3.6/site-packages/urllib3/util/retry.py", line 574, in incrementraise MaxRetryError(_pool, url, error or ResponseError(cause))
urllib3.exceptions.MaxRetryError: HTTPConnectionPool(host='localhost', port=2019): Max retries exceeded with url: /events (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7f5bc655ce48>: Failed to establish a new connection: [Errno 111] Connection refused',))
......(循环地报类似的错误)

报错原因：
在训练中使用了visdom可视化工具对模型训练进行可视化监测，因为visdom无法正常工作导致报错。
具体原因可能如下：
①在训练前没使用python -m visdom.server命令开启visdom服务
②在训练中因为断开了远程连接导致python -m visdom.server命令停止运行，visdom无法正常工作
③设定的端口已被占用

解决方案：
1)在开始训练前使用lsof -i:端口号查看所需要使用的端口是否被占用（listened状态),如果此时端口被占用，可以选择结束此进程kill -9 进程id或者在程序中更改visdom需要使用的端口号（此处我就将端口号改成了2019）

2）在确认端口无占用后，使用nohup pyhton -m visdom.server &开启visdom服务，保证命令在后台运行不挂断

如果更换端口号，请使用nohup python -m visdom.server -p 端口号 &开启visdom服务对应网址为http://localhost:端口号/

3）然后就可以开始愉快地训练啦~

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