Using SSH inside a Dockerfile

docker.sh

eval `ssh-agent`
ssh-add

docker build -t my:latest --ssh default=$HOME/.ssh/github-private-key .

Dockerfile

# syntax=docker/dockerfile:1.5

FROM haskell:8.10.7

RUN mkdir -p -m 0700 ~/.ssh && ssh-keyscan github.com >> ~/.ssh/known_hosts

WORKDIR /tmp/app
COPY . .
RUN mkdir -p /home/app
RUN --mount=type=ssh stack install --local-bin-path /home/app
RUN rm -rf /tmp/app

WORKDIR /home/app
CMD ["./my-exe"]

DockerSSH.md

SSH in a Dockerfile

Prerequisites

• You must have BuildKit enabled in Docker.
• You must have ~/.ssh/config set up with a proper alias for the server you want to access via SSH.
• When referencing external resources via SSH, always use a proper domain name, never an SSH alias. In other words, use something like git@github.com:foo/bar.
• Use the latest Dockerfile syntax using # syntax=docker/dockerfile:1.x at the top.