docker-notes.md

Docker behind proxy

https://stackoverflow.com/questions/23111631/cannot-download-docker-images-behind-a-proxy

mkdir /etc/systemd/system/docker.service.d
cat << EOF > /etc/systemd/system/docker.service.d/http-proxy.conf
[Service]
Environment="HTTP_PROXY=http://proxy.example.com:80/"
Environment="HTTPS_PROXY=http://proxy.example.com:80/"
Environment="NO_PROXY=localhost,127.0.0.1,::1"
EOF

sudo systemctl daemon-reload
sudo systemctl show --property Environment docker
sudo systemctl restart docker

Docker without sudo

from https://askubuntu.com/questions/477551/how-can-i-use-docker-without-sudo

usermod -aG docker $USER

and relogin or run newgrp docker

Note: adding user to the docker group basically gives them root privileges.

Docker build with proxy

per https://stackoverflow.com/questions/46444026/use-proxy-inside-a-docker-container

run the command with environment:

FROM ubuntu

RUN export "http_proxy=http://host:port" \
    && export "https_proxy=http://host:port" \
    && apt-get update \
    && apt-get install -y SOME-PACKAGE

or add the environment to the whole Dockerfile:

FROM ubuntu

ENV http_proxy http://host:port
ENV https_proxy http://host:port

RUN apt-get update \
    && apt-get install -y SOME-PACKAGE

This will work for apt-get. Things like Maven have their own environment variables:

ENV MAVEN_OPTS -Dhttp.proxyHost=www-proxy-lon.uk.oracle.com -Dhttp.proxyPort=80 -Dhttps.proxyHost=www-proxy-lon.uk.oracle.com -Dhttps.proxyPort=80

NOTE: these ENV entries have to be repeated after each FROM in given Dockerfile.