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66 lines
1.9 KiB
Text
66 lines
1.9 KiB
Text
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How To Install Private Git Hosted Dependencies Inside Docker Image Using SSH
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#
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docker
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#
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devops
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#
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security
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#
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python
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Introduction
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This quick guide will show you how to mount a ssh key inside a container in build time, to allow you to install private dependencies, that won't be persisted in the final image. It uses python but could work with any language/package manager that uses git + ssh.
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Dockerfile
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First you need to set Dockerfile syntax to docker/dockerfile:1.2. Put this in the beggining of the file:
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# syntax = docker/dockerfile:1.2
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Now install git and openssh, and setup ssh folders:
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RUN apt update && \
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apt install -y git openssh-client && \
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mkdir -p /root/.ssh && \
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ssh-keyscan github.com >> /root/.ssh/known_hosts
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May vary depending on the base image you're using, just change with the package manager you use.
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Make sure to change github.com with your git host.
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Now you have to mount the ssh key in the step that installs the dependency:
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RUN --mount=type=secret,id=id_rsa,dst=/root/.ssh/id_rsa \
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pip install git+ssh://git@github.com/username/repository.git@version
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This will mount secret identified by id_rsa on /root/.ssh/id_rsa.
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Building
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When building you need to specify your ssh key as id_rsa secret:
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docker build . \
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-f Dockerfile \
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--secret id=id_rsa,src=/home/user/.ssh/id_rsa
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Or using docker compose:
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version: '3.7'
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services:
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your_service:
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build:
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context: .
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dockerfile: Dockerfile
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secrets:
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- id_rsa
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secrets:
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id_rsa:
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file: /home/user/.ssh/id_rsa
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Final file
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# syntax = docker/dockerfile:1.2
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FROM python:3.11
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RUN apt update && \
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apt install -y git openssh-client && \
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mkdir -p /root/.ssh && \
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ssh-keyscan github.com >> /root/.ssh/known_hosts
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RUN --mount=type=secret,id=id_rsa,dst=/root/.ssh/id_rsa \
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pip install git+ssh://git@github.com/username
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example
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pip install git+ssh://git@github.com/sammyfilly
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