dockerfile里面
RUN apt-get update && apt-get installbuild的时候比较慢，想在build期间用http代理，用prioxy到127.0.0.1:8118，firefox里面代理可用，但docker build就是不行
google出来github issue里提到, docker版本1.10.3，命令试过下面的写法，都不行。
# docker build --build-arg HTTP_PROXY=http://127.0.0.1:8118 . # docker build --build-arg=[HTTP_PROXY=http://127.0.0.1:8118] .
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Each RUN line is run in a temporary container, and the proxy of the host cannot be connected using 127.0.0.1 in the container
It is best to connect to a VPN, which acts as a global proxy and does not require any parameters.
Isn’t it possible to directly set the two environment variables http_proxy and https_proxy?