爬虫工作 4~5 个小时，就报错了，不明白什么原因导致的，帮忙看一下

[wsds]

报错很长，但看上去大概是这个原因：socket.gaierror: [Errno -3] Temporary failure in name resolution

阿里云上运行的

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/urllib3/connection.py", line 137, in _new_conn
    (self.host, self.port), self.timeout, **extra_kw)
  File "/usr/lib/python3/dist-packages/urllib3/util/connection.py", line 67, in create_connection
    for res in socket.getaddrinfo(host, port, 0, socket.SOCK_STREAM):
  File "/usr/lib/python3.5/socket.py", line 732, in getaddrinfo
    for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
socket.gaierror: [Errno -3] Temporary failure in name resolution

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/urllib3/connectionpool.py", line 560, in urlopen
    body=body, headers=headers)
  File "/usr/lib/python3/dist-packages/urllib3/connectionpool.py", line 354, in _make_request
    conn.request(method, url, **httplib_request_kw)
  File "/usr/lib/python3.5/http/client.py", line 1106, in request
    self._send_request(method, url, body, headers)
  File "/usr/lib/python3.5/http/client.py", line 1151, in _send_request
    self.endheaders(body)
  File "/usr/lib/python3.5/http/client.py", line 1102, in endheaders
    self._send_output(message_body)
  File "/usr/lib/python3.5/http/client.py", line 934, in _send_output
    self.send(msg)
  File "/usr/lib/python3.5/http/client.py", line 877, in send
    self.connect()
  File "/usr/lib/python3/dist-packages/urllib3/connection.py", line 162, in connect
    conn = self._new_conn()
  File "/usr/lib/python3/dist-packages/urllib3/connection.py", line 146, in _new_conn
    self, "Failed to establish a new connection: %s" % e)
requests.packages.urllib3.exceptions.NewConnectionError: <requests.packages.urllib3.connection.HTTPConnection object at 0x7feaccda2668>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/requests/adapters.py", line 376, in send
    timeout=timeout
  File "/usr/lib/python3/dist-packages/urllib3/connectionpool.py", line 610, in urlopen
    _stacktrace=sys.exc_info()[2])
  File "/usr/lib/python3/dist-packages/urllib3/util/retry.py", line 273, in increment
    raise MaxRetryError(_pool, url, error or ResponseError(cause))
requests.packages.urllib3.exceptions.MaxRetryError: HTTPConnectionPool(host='http://www.xiangshu.com/', port=80): Max retries exceeded with url: http://www.xiangshu.com/3603751.html (Caused by NewConnectionError('<requests.packages.urllib3.connection.HTTPConnection object at 0x7feaccda2668>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution',))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "getimg.py", line 102, in <module>
    GetImg().getdata()
  File "getimg.py", line 76, in getdata
    base_url + j['href'], headers=self.headers)
  File "/usr/lib/python3/dist-packages/requests/sessions.py", line 480, in get
    return self.request('GET', url, **kwargs)
  File "/usr/lib/python3/dist-packages/requests/sessions.py", line 468, in request
    resp = self.send(prep, **send_kwargs)
  File "/usr/lib/python3/dist-packages/requests/sessions.py", line 576, in send
    r = adapter.send(request, **kwargs)
  File "/usr/lib/python3/dist-packages/requests/adapters.py", line 437, in send
    raise ConnectionError(e, request=request)
requests.exceptions.ConnectionError: HTTPConnectionPool(host='http://www.xiangshu.com/', port=80): Max retries exceeded with url: http://www.xiangshu.com/3603751.html (Caused by NewConnectionError('<requests.packages.urllib3.connection.HTTPConnection object at 0x7feaccda2668>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution',))

[golmic]

是所有的都报错还是偶尔有报错？ 像是触发反爬

[wsds]

@golmic 基本爬几个小时就会报这个错

[wsds]

@golmic 才爬了 1 万张不到

[lululau]

像是域名解析偶发抽风

[xxxy]

dns 也有频率限制的

[golmic]

@lululau #4 解析出错会报 DNS 错误吧

大量报错就处理一下反爬，偶尔报的话重试就行

[Cooky]

换个好点的 dns ？

[lerry]

本地装个 dnsmasq 配置成系统默认 DNS， 可以改善 dns 查询

[baday]

请求头 connection 设置为 close 试试

[wsds]

@lululau 网上查了些，说是这么回事

[wsds]

@Cooky 好点的是哪种？

[wsds]

@lerry 这是阿里云上

[ihancheng]

不想吐槽套路云了，正在学 python 爬虫，我用腾讯云就没问题，阿里云抛异常死活解决不了…… 不知道是不是自己的问题，但是我在网上找了方法还是无法解决。

[owenliang]

异常是可以捕获的

[wsds]

@owenliang 这个已经是捕获后又抛出的了，你没看到 n 个 another exception occurred

[Cooky]

@wsds 阿里云不能装 dnsmasq ？

[hicdn]

DNS 解析问题。如果爬的是几个固定域名，改 hosts 文件。

[dapengzhao]

我的爬虫运行一段时间也会报这个错我的解决方法时如果 ip 不被封就捕获这个异常睡一会然后在 while true 下 break 结束此次循环重新开始。

[gamecreating]

异常 捕获一下 处理吧...

爬虫本来就不能保证全部连接成功 爬取成功

[JCZ2MkKb5S8ZX9pq]

自己写个 request，把 requests 包进去，常用的异常处理重试随机 ua 自动代理等等的都包进去，一劳永逸。

[beforeuwait]

Failed to establish a new connection
遇到这种问题，写个 try except，报错休息 20 秒，再请求