Docker中使用pip2遇到proxy问题的解决（Can't install pip packages inside a docker container）

遇到问题如下：

Retrying (Retry(total=1, connect=None, read=None, redirect=None)) after connection broken by 'ProtocolError('Connection aborted.', gaierror(-2, 'Name or service not known'))': /simple/python-dotenv/

解决方案亲测成功：

Adding Google DNS to your local config

Modifying /etc/resolv.conf and adding the following lines at the end

#
Google IPv4 nameservers

nameserver
8.8.8.8

nameserver
8.8.4.4

If you want to add other DNS servers, have a look here.

However this change won't be permanent (see this
thread). To make it permanent :

$
sudo nano /etc/dhcp/dhclient.conf

Uncomment and edit the line with prepend domain-name-server :

prepend
domain-name-servers 8.8.8.8, 8.8.4.4;

Restart dhclient :

$
sudo dhclient

.

解决方案引用至：http://stackoverflow.com/questions/28668180/cant-install-pip-packages-inside-a-docker-container-with-ubuntu