Docker

101

What it's?

or...
Does that make?

Docker "enables true independence between applications and infrastructure and developers".

Dockerfile

FROM ruby:2.4.2

RUN apt-get update
RUN gem install bundler

ENV HOME=/home/project
RUN mkdir -p $HOME
ADD . $HOME
WORKDIR $HOME

RUN bundle install

Dockerfile

FROM ruby:2.4.2

RUN apt-get update
RUN gem install bundler

ENV HOME=/home/project
RUN mkdir -p $HOME
ADD . $HOME
WORKDIR $HOME

RUN bundle install

image to use

Dockerfile

FROM ruby:2.4.2

RUN apt-get update
RUN gem install bundler

ENV HOME=/home/project
RUN mkdir -p $HOME
ADD . $HOME
WORKDIR $HOME

RUN bundle install

execute a command

Dockerfile

FROM ruby:2.4.2

RUN apt-get update
RUN gem install bundler

ENV HOME=/home/project
RUN mkdir -p $HOME
ADD . $HOME
WORKDIR $HOME

RUN bundle install

set an environment variable

Dockerfile

FROM ruby:2.4.2

RUN apt-get update
RUN gem install bundler

ENV HOME=/home/project
RUN mkdir -p $HOME
ADD . $HOME
WORKDIR $HOME

RUN bundle install

add/copy to guest

Dockerfile

FROM ruby:2.4.2

RUN apt-get update
RUN gem install bundler

ENV HOME=/home/project
RUN mkdir -p $HOME
ADD . $HOME
WORKDIR $HOME

RUN bundle install

set the workdir

docker-compose.yaml

version: '2'
services:
  name_of_service:
     image: name_of_image
     container_name: name_of_container
     build: .
     volumes:
        - .:/home/project
        - bundle:/usr/local/bundle

     command: bash -c "rspec"

volumes:

  bundle:
     driver: local