docker inside docker

command

docker build -t ubuntu-docker:latest .

docker run -it -v /var/run/docker.sock:/var/run/docker.sock -v $(pwd)/app:/app ubuntu-docker:latest bash

Dockerfile

FROM ubuntu:latest

LABEL maintainer="Diego Mengarda <diegormengarda@gmail.com>"

ENV APT_KEY_DONT_WARN_ON_DANGEROUS_USAGE=1

ARG ssh_pub_key=""
ARG ssh_prv_key=""

RUN apt-get update && \
    apt-get install -y --no-install-recommends apt-transport-https ca-certificates curl software-properties-common gpg-agent nano && \
    curl -fsSL https://download.docker.com/linux/ubuntu/gpg | apt-key add - && \
    add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu focal stable" && \
    apt update && \
    apt install -y docker-ce docker-compose

# Authorize SSH Host
RUN mkdir -p /root/.ssh && \
    chmod 0700 /root/.ssh && \
    ssh-keyscan bitbucket.org > /root/.ssh/known_hosts

# Add the keys and set permissions
RUN echo "$ssh_prv_key" > /root/.ssh/id_rsa && \
    echo "$ssh_pub_key" > /root/.ssh/id_rsa.pub && \
    chmod 600 /root/.ssh/id_rsa && \
    chmod 600 /root/.ssh/id_rsa.pub

COPY id_rsa /root/.ssh/id_rsa
COPY id_rsa.pub /root/.ssh/id_rsa.pub

COPY start.sh /usr/local/bin/start
RUN chmod +x /usr/local/bin/start

#ensures that /var/run/docker.sock exists
RUN touch /var/run/docker.sock

#changes the ownership of /var/run/docker.sock
RUN chown root:docker /var/run/docker.sock

#gives jenkins user permissions to access /var/run/docker.sock
RUN usermod -a -G docker root

ENTRYPOINT ["start"]

start.sh

#!/bin/sh

mkdir -p app/adopter

git clone git@bitbucket.org:diegomengarda/api-adopter.git app/adopter

docker run --rm -it -v $(pwd)/app/adopter:/app composer ls -la

exec "$@"