Inject host's SSH keys into Docker Machine with Docker Compose

Question

I am using Docker on Mac OS X with Docker Machine (with the default boot2docker machine), and I use docker-compose to setup my development environment.

Let\'s say th

Answer 1

You can use multi stage build to build containers This is the approach you can take :-

Stage 1 building an image with ssh

FROM ubuntu as sshImage
LABEL stage=sshImage
ARG SSH_PRIVATE_KEY
WORKDIR /root/temp

RUN apt-get update && \
    apt-get install -y git npm 

RUN mkdir /root/.ssh/ &&\
    echo "${SSH_PRIVATE_KEY}" > /root/.ssh/id_rsa &&\
    chmod 600 /root/.ssh/id_rsa &&\
    touch /root/.ssh/known_hosts &&\
    ssh-keyscan github.com >> /root/.ssh/known_hosts

COPY package*.json ./

RUN npm install

RUN cp -R node_modules prod_node_modules

Stage 2: build your container

FROM node:10-alpine

RUN mkdir -p /usr/app

WORKDIR /usr/app

COPY ./ ./

COPY --from=sshImage /root/temp/prod_node_modules ./node_modules

EXPOSE 3006

CMD ["npm", "run", "dev"] 

add env attribute in your compose file:

environment:
      - SSH_PRIVATE_KEY=${SSH_PRIVATE_KEY}

then pass args from build script like this:

docker-compose build --build-arg SSH_PRIVATE_KEY="$(cat ~/.ssh/id_rsa)"

And remove the intermediate container it for security. This Will help you cheers.