How to define a docker cli service in docker-compose - docker

Question

I have a docker-compose file that runs a few services.
services:
cli:
build:
context: .
dockerfile: docker/cli/Dockerfile
volumes:
- ./drupal8site:/var/www/html/drupal8site
drupal:
container_name: drupal
build:
context: .
dockerfile: docker/DockerFile.drupal
args:
DOC_ROOT: /var/www/html/drupal8site
ports:
- 80:80
volumes:
- ./drupal8site:/var/www/html/drupal8site
restart: always
environment:
APACHE_DOCUMENT_ROOT: /var/www/html/drupal8site/web
mysql:
image: mysql:5.7
ports:
- 3306:3306
volumes:
- ./mysql:/var/lib/mysql
environment:
MYSQL_ROOT_PASSWORD: root
I would like to add another service which will be a container in which I could run CLI commands (composer, drush for drupal, php, etc).
The following Dockerfile was how I initially defined the cli service but it stops right after it is run. How do I define it so it is part of my docker-compose, shares my mounted volume, and I can interactively connect to it and run CLI commands on it ?
FROM php:7.2-cli
#various programs
RUN apt-get update \
&& apt-get install vim --assume-yes \
&& apt-get install git --assume-yes \
&& apt-get install mysql-client --assume-yes
CMD ["bash"]
Thanks,
Yaron

Answer 1

If you want to run automated scripts on docker images this is obviously a job for a ci-pipeline. You can use CloudFoundry or OpenStack to do this.
But there are many other questions in this post:
1.) How can i share my mounted volume:
You can pass a volume with the -v option to a container. e.g.:
docker run -it -d -v $(pwd)/localFolder:/exposedFolderFromDocker mydockerhub/myawesomeimage
2.) Can I interactively connect to it and run CLI commands on it
docker exec -it docker_cli_1 bash
I recommend to implement features of an docker-image to the individual docker-images Dockerfile. For example copying and running a prepared shell-script:
# your Dockerfile
FROM php:7.2-cli
#various programs
RUN apt-get update \
&& apt-get install vim --assume-yes \
&& apt-get install git --assume-yes \
&& apt-get install mysql-client --assume-yes
# individual changes
COPY your_script.sh /
RUN chown root:root /your_script.sh && \
chmod 0755 /your_script.sh
CMD ["/your_script.sh"]
# a folder to expose
VOLUME /exposedFolderFromDocker
CMD ["bash"]