How to authenticate when connecting to a proxy server inside ubuntu-based docker container?

Jakub Partyka

2/2/23, 4:47 PM

I am building a docker container that should use proxy server when sending HTTP requests. Unfortunately I can't get it to work - I can't authenticate to the proxy from inside the container, even though credentials are correct.

Expected result curl https://api.myip.com returns JSON response with proxy's IP

Actual result: curl https://api.myip.com returns curl: (56) Received HTTP code 407 from proxy after CONNECT

What I tried:

setting HTTP_PROXY env variables (same for HTTPS env)
adding "Acquire::http::Proxy" string to /etc/apt/apt.conf (same for https)
tried different configurations (only ENV, only apt.conf file, both)

What I checked:

/etc/apt/apt.conf contains desired lines (provided below)
ENVs are set correctly inside the container
proxy is working correctly outside the container
proxy authentication works correctly (authorization successful) via browser run from outside the container
docker networking works properly (no problems when not using proxy)

my apt.conf:

Acquire::http::Proxy "http://<my_login>:<my_pass>@<proxy_ip>:<proxy_port>/";
Acquire::https::Proxy "https://<my_login>:<my_pass>@<proxy_ip>:<proxy_port>/";
Acquire::socks::Proxy "socks://<my_login>:<my_pass>@<proxy_ip>:<proxy_port>/";

my Dockerfile:

from ubuntu:latest

COPY ./rss/apt.conf /apt.conf
ENV HTTP_PROXY=<ip>:<port>
ENV HTTPS_PROXY=<ip>:<port>

RUN apt update && apt install -y curl
RUN cat /apt.conf >> /etc/apt/apt.conf

ENTRYPOINT ["sleep","1000"]

Docker version: Docker version 20.10.8, build 3967b7d

171

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networking

proxy

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docker

zwets

2/2/23, 8:46 PM

I assume you want to set the system-wide http proxy. The `Acquire::http::Proxy` in `apt.conf` does not do this. It merely sets the mirror that `apt` uses.

Jakub Partyka

2/3/23, 10:25 AM

this is useful, thank you. Do you know a way to set proxy credentials for system-wide configuration?

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: How to authenticate when connecting to a proxy server inside ubuntu-based docker container?

TH: จะตรวจสอบสิทธิ์เมื่อเชื่อมต่อกับพร็อกซีเซิร์ฟเวอร์ภายในคอนเทนเนอร์นักเทียบท่าที่ใช้ Ubuntu ได้อย่างไร

RO: Cum să vă autentificați atunci când vă conectați la un server proxy în interiorul containerului docker bazat pe Ubuntu?

RU: Как пройти аутентификацию при подключении к прокси-серверу внутри док-контейнера на основе Ubuntu?

VI: Làm cách nào để xác thực khi kết nối với máy chủ proxy bên trong bộ chứa docker dựa trên Ubuntu?

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