Tuturials

https://docs.docker.com/compose/

https://docs.docker.com/compose/django/

Postgres

https://hub.docker.com/_/postgres/

pip install psycopg2

python -m pip freeze > requirements.txt

settings.py

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql',
        'NAME': 'postgres',
        'USER': 'postgres',
        'PASSWORD': 'hunter2',
        'HOST': 'db'
    }
}

After pip install

The COPY is only done, when the image is build. So after an installation of a pip module we need the build parameter.

run the following command, otherwise the new pip module is missing and you get an error docker-compose up --build

Docker commands

Test docker docker build .

Show all docker container that are running docker ps

Show all docker container

docker ps -a

Show diff of file operations in an image

docker diff 921fd93e507d

Show log of a container

docker logs -t 8adb0bb101c1

docker logs -f 8adb0bb101c1

Stop a container

docker kill 8adb0bb101c1

docker stop 8adb0bb101c1

Show CPU of the container

docker stats

Remove container

docker rm 8adb0bb101c1

Clean up unused images

docker image prune

Clean up unused volumes

docker volume prune

Docker compose commands

run docker-compose

docker-compose up

docker-compose down

run docker-compose with a special yml file

docker-compose -f docker-compose-deploy.yml up [--build]

docker-compose exec web python manage.py makemigrations

docker-compose exec web python manage.py migrate

docker-compose exec web python manage.py createsuperuser

Open bash in container docker exec it <container-name> bash

Show size of docker docker system df

Inspect images docker inspect <container-id>

Backup

Postgres

docker ps

docker exec <container id> /usr/bin/pg_dump -U postgres postgres > backup.sql

env files

docker cp <container id>:/app/.env env_1

docker cp <container id>:/app/running_results/.env env_2