轉(zhuǎn)載請(qǐng)注明文章出處：https://tlanyan.me/python-ins...

今天用 pip 安裝軟件包，死活安裝不上，出現(xiàn)如下錯(cuò)誤：

          
            Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('
            
              : Failed to establish a new connection: [Errno 8] nodename nor servname provided, or not known')': /packages/5c/e0/be401c003291b56efc55aeba6a80ab790d3d4cece2778288d65323009420/pip-19.1.1-py2.py3-none-any.whl
  Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('
              
                : Failed to establish a new connection: [Errno 8] nodename nor servname provided, or not known')': /packages/5c/e0/be401c003291b56efc55aeba6a80ab790d3d4cece2778288d65323009420/pip-19.1.1-py2.py3-none-any.whl
  Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('
                
                  : Failed to establish a new connection: [Errno 8] nodename nor servname provided, or not known')': /packages/5c/e0/be401c003291b56efc55aeba6a80ab790d3d4cece2778288d65323009420/pip-19.1.1-py2.py3-none-any.whl
  Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('
                  
                    : Failed to establish a new connection: [Errno 8] nodename nor servname provided, or not known')': /packages/5c/e0/be401c003291b56efc55aeba6a80ab790d3d4cece2778288d65323009420/pip-19.1.1-py2.py3-none-any.whl
  Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('
                    
                      : Failed to establish a new connection: [Errno 8] nodename nor servname provided, or not known')': /packages/5c/e0/be401c003291b56efc55aeba6a80ab790d3d4cece2778288d65323009420/pip-19.1.1-py2.py3-none-any.whl

Could not install packages due to an EnvironmentError: HTTPSConnectionPool(host='files.pythonhosted.org', port=443): Max retries exceeded with url: /packages/5c/e0/be401c003291b56efc55aeba6a80ab790d3d4cece2778288d65323009420/pip-19.1.1-py2.py3-none-any.whl (Caused by NewConnectionError('
                      
                        : Failed to establish a new connection: [Errno 8] nodename nor servname provided, or not known'))


                      
                    
                  
                
              
            
          
        

還以為是特定軟件包的問(wèn)題，很快發(fā)現(xiàn)升級(jí)pip也有問(wèn)題。

網(wǎng)上找了一圈，把代理、vpn等都關(guān)了，問(wèn)題依舊。仔細(xì)看錯(cuò)誤的最后一行，看到有 files.pythonhosted.org 這個(gè)域名，心想難道這個(gè)域名掛了？

ping這個(gè)域名，竟然提示解析錯(cuò)誤。于是登陸到境外的服務(wù)器上ping，解析正常。想到應(yīng)該是dns解析問(wèn)題，接著把dns換成了 1.1.1.1 和 8.8.8.8 ，再次安裝，問(wèn)題順利解決。