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Dockerized Django app and MySQL with docker-compose using .env

I would to run my Django project into a Docker container with its Database on another Docker container inside a Bebian
When i run my docker container, I have some errors. Like : Lost connection to MySQL server during query ([Errno 104] Connection reset by peer).
This command mysql > SET GLOBAL log_bin_trust_function_creators = 1 is very important because database's Django user create trigger.
Morever, I use a .env file used same for create DB image to store DB user and password. This path is settings/.env.
My code:
docker-compose.yml:
version: '3.3'
services:
db:
image: mysql:8.0.29
container_name: db_mysql_container
environment:
MYSQL_DATABASE: $DB_NAME
MYSQL_USER: $DB_USER
MYSQL_PASSWORD: $DB_PASSWORD
MYSQL_ROOT_PASSWORD: $DB_ROOT_PASSWORD
command: ["--log_bin_trust_function_creators=1"]
ports:
- '3306:3306'
expose:
- '3306'
api:
build: .
container_name: django_container
command: bash -c "pip install -q -r requirements.txt &&
python manage.py migrate &&
python manage.py runserver 0.0.0.0:8000"
volumes:
- .:/app
ports:
- '8000:8000'
depends_on:
- db
Dockerfile :
# syntax=docker/dockerfile:1
FROM python:3.9.14-buster
ENV PYTHONUNBUFFERED=1
RUN mkdir /app
WORKDIR /app
COPY requirements.txt /app/
RUN pip install -r requirements.txt
ADD . /app/
How to start my Django project ? Is possible to start only the DB container ?
What command i need execute and what changes i need to make, I'm novice with Docker ! So if you help me, please explains your commands and actions !
You can find this project on my GitHub
Thank !

To run dockerized django project.
Simply you can run below command:
docker-compose run projectname bash -c "python manage.py createsuperuser"
Above command is used for to create superuser

docker-compose up error for django and mysql

I am trying to configure Django and MySql application with Docker containers.
For Django I am using python:3.7-slim image and for MySql mysql:5.6.
When I run docker-compose up it returns an error stated below -
ERROR: for app_mysql_db_1 Cannot start service mysql_db: driver failed programming external connectivity on endpoint app_mysql_db_1 (c647d4793a198af2c09cc52d08191fb2cd984025ad0a61434ad1577d9dcccebe): Error starting userland proxy: listen tcp 0.0.0.0:3306: bind: address already in use
I run command docker ps -a to check docker status and found that mysql container was created but the python container status was exited.
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
7d91795e0bae mysql:5.6 "docker-entrypoint.s…" 15 seconds ago Created app_mysql_db_1
fa0419ad0f21 e0bf94710555 "/bin/sh -c 'adduser…" 2 minutes ago Exited (1) 2 minutes ago pedantic_faraday
can someone rewrite or suggest the modification for the configurations.
Dockerfile
FROM python:3.7-slim
ENV PYTHONUNBUFFERED 1
RUN apt-get update
RUN apt-get install python3-dev default-libmysqlclient-dev gcc -y
COPY ./requirements.txt /requirements.txt
RUN pip install -r /requirements.txt
RUN mkdir /app
WORKDIR /app
COPY . /app
docker-compose.yaml
version: "3"
services:
eitan-application:
restart: always
build:
context: .
ports:
- "8000:8000"
volumes:
- ./eitan:/app
command: >
sh -c "python3 manage.py runserver 0.0.0.0:8000
&& python3 manage.py makemigrations
&& python3 manage.py migrate"
depends_on:
- mysql_db
mysql_db:
image: mysql:5.6
command: mysqld --default-authentication-plugin=mysql_native_password
volumes:
- "./mysql:/var/lib/mysql"
ports:
- "3306:3306"
restart: always
environment:
- MYSQL_ROOT_PASSWORD=root
- MYSQL_DATABASE=root
- MYSQL_USER=root
- MYSQL_PASSWORD=root
settings.py
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.mysql',
'NAME': 'my-app-db',
'USER': 'root',
'PASSWORD': 'root',
'HOST': 'mysql_db',
'PORT': 3307,
}
}

bind: address already in use suggests that you have some local database running. If you don't need to access database outside of docker-compose network don't expose port 3306. So I'd try to test it without
...
ports:
- "3306:3306"
...
Also in settings.py you connect to port mysql_db:3307 so change it to default port 3306.
Even if you expose database port to some other port on localhost then settings.py connects using mysql_db network, so you shouldn't change this port in django settings.

Dockerize a Django app with a MySQL container

I have an app developed in Django (2.2.7) with python (3.8.0), Docker (19.03.5) and docker-compose (1.25.2) running in Windows 10 pro. I want to Dockerize it with changing the sqlite3 database for a MySQL database. I've already write this Dockerfile:
FROM python:3.7
ENV PYTHONUNBUFFERED 1
RUN mkdir /code
WORKDIR /code
ADD . /code/
RUN pip install --upgrade pip && pip install -r requirements.txt
RUN pip install mysqlclient
COPY . /code/
And this docker-compose.yml file:
version: '3'
services:
db:
image: mysql:5.7
ports:
- '3306:3306'
environment:
MYSQL_DATABASE: 'my-app-db'
MYSQL_USER: 'root'
MYSQL_PASSWORD: 'password'
MYSQL_ROOT_PASSWORD: 'password'
volumes:
- .setup.sql:/docker-entrypoint-initbd.d/setup.sql
web:
build: .
command: python manage.py runserver 0.0.0.0:8000
volumes:
- .:/code
ports:
- "8000:8000"
depends_on:
- db
links:
- db
Also I have change the default database configurations in settings.py for this:
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.mysql',
'NAME': 'my-app-db',
'USER': 'root',
'PASSWORD': 'password',
'HOST': 'db',
'PORT': 3306,
}
}
After all of this the docker compose works and the app starts, but the problem is that the tables in the database are not created. I've tried with these How do I add a table in MySQL using docker-compose, Seeding a MySQL DB for a Dockerized Django App or this Seeding a MySQL DB for a Dockerized Django App but I couldn't fix it yet.
How can I create the required tables in the MySQL db container while runing the docker-compose? Must I add every single table by hand or there is a way to do it from the django app automatically?
Thanks

Hi i think this answer helps you
##1.- Reset all your migrations
find . -path "*/migrations/*.py" -not -name "__init__.py" -delete
find . -path "*/migrations/*.pyc" -delete
##2.- See and apply your migrations again
python manage.py showmigrations
python manage.py makemigrations
python manage.py migrate

You should not reset your migrations unless you want to wipe all of the data completely and start over. Your migrations should exist beforehand. So if you dont mind about old migrations you can delete them and use python manage.py makemigrations and then proceed to following steps:
So if your applications starts at the moment, we need to update your docker-compose file in a way that it uses entrypoint.sh. An ENTRYPOINT allows you to configure a container that will run as an executable.
First things first, create your entrypoint.sh file on the same level as docker-compose.yaml.
Next, don't forget to add chmod +x entrypoint.sh so entrypoint can be executed
entrypoint.sh file:
#!/bin/bash
set -e
echo "${0}: running migrations."
python manage.py migrate --noinput
echo "${0}: collecting statics."
python manage.py collectstatic --noinput
python manage.py runserver 0.0.0.0:8000
Afterwards update your docker-compose.yaml file. Change your command line to:
command:
- /bin/sh
- '-c'
- '/code/entrypoint.sh'
Additionally you should store all of your pip requirements in requirements.txt file and in your Dockerfile you should run pip install -r requirements.txt
You can dump your pip requirements with a command pip freeze > requirements.txt

How can I set the best configurations for the project working with django, docker and mysql?

I was reading an article in here which is about setting up project using docker, django and mysql together.
these are my files in project:
Dockerfile
FROM python:3.7
MAINTAINER masoud masoumi moghadam
ENV PYTHONUNBUFFERED 1
RUN mkdir /app
WORKDIR /app
ADD . /app
ADD requirements.txt /app/requirements.txt
RUN pip install --upgrade pip && pip install -r requirements.txt
Docker-compose
version: "3"
services:
app:
build:
context: .
ports:
- "8000:8000"
volumes:
- ./app:/app
command: >
sh -c "python manage.py runserver 0.0.0.0:8000"
environment:
- DB_HOST=localhost
- DB_NAME=contact_list
- DB_USER=root
- DB_PASS=secretpassword
depends_on:
- db
db:
image: mysql:5.7
environment:
- MYSQL_DATABASE=contact_list
- MYSQL_USER=root
- MYSQL_PASSWORD=secretpassword
requirements
Django>=2.0,<3.0
djangorestframework<3.10.0
mysqlclient==1.3.13
django-mysql==2.2.0
and also this settings in my setting.py:
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.mysql',
'HOST': os.environ.get('DB_HOST'),
'NAME': os.environ.get('DB_NAME'),
'USER': os.environ.get('DB_USER'),
'PASSWORD': os.environ.get('DB_PASS')
}
}
When I use docker-compose build I face no problem and everything is just fine. Then I run service mysql start. I can assure that mysql service is in run and works because I have access to datasets. The problem occurs when I do the migration using this command docker-compose run app sh -c "python manage.py makemigrations core" I get this error:
django.db.utils.OperationalError: (2002,
"Can't connect to local MySQL server through socket
'/var/run/mysqld/mysqld.sock' (2)")
When I change localhost to 127.0.0.1 I get this error:
django.db.utils.OperationalError:
(2002, "Can't connect to MySQL
server on '127.0.0.1' (115)")
I spent 20 hours looking for the best possible configuration for these technologies, But I still can't figure out anything. I also used python-alpine but I still could not find it useful for project because I had the same mysql dependencies problem when I was trying to do docker build. Does anybody have the same experience? I would appreciate if you could help me here.

Your problem is that you use localhost as the host of mysql in django's config.
But docker containers have their own IP, they are not localhost.
So first in your docker-compose file, name your containers :
db:
image: mysql:5.7
container_name: db
...
Then in your django settings, set your db HOST to your db container name : "db" :
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.mysql',
'HOST': 'db',
'PORT' : 3306, # (?)
...
Also you are missing the db 'PORT' in django settings, I think that for Mysql it is 3306 (I've added it above).

According to this beautifully organized article, I found out this configurations will have no issues running on a server(changed mysql service to postgress service):
Dockerfile
# pull official base image
FROM python:3.8.0-alpine
# set work directory
WORKDIR /usr/src/app
# set environment variables
ENV PYTHONDONTWRITEBYTECODE 1
ENV PYTHONUNBUFFERED 1
# install psycopg2 dependencies
RUN apk update \
&& apk add postgresql-dev gcc python3-dev musl-dev
# install dependencies
RUN pip install --upgrade pip
COPY requirements.txt /usr/src/app/requirements.txt
RUN pip install -r requirements.txt
# copy entrypoint.sh
COPY entrypoint.sh /usr/src/app/entrypoint.sh
# copy project
COPY . /usr/src/app/
# run entrypoint.sh
ENTRYPOINT ["/usr/src/app/entrypoint.sh"]
Docker-compose.yml
version: '3.7'
services:
web:
build: app
# container_name: web
command: python manage.py runserver 0.0.0.0:8000
restart: always
volumes:
- ./app/:/usr/src/app/
ports:
- 8000:8000
env_file:
- .env.dev
depends_on:
- db
db:
image: postgres:12.0-alpine
# container_name: postgres
restart: always
volumes:
- postgres_data:/var/lib/postgresql/data/
environment:
- POSTGRES_USER=user
- POSTGRES_PASSWORD=123456
- POSTGRES_DB=contact_list
requirements
Django==2.2.6
gunicorn==19.9.0
djangorestframework>=3.9.2,<3.10.0
psycopg2-binary==2.8.3
settings
DATABASES = {
'default': {
'ENGINE': os.environ.get('SQL_ENGINE', "django.db.backends.sqlite3"),
'NAME': os.environ.get("SQL_DB_NAME", os.path.join(BASE_DIR, "db.sqlite3")),
'USER': os.environ.get("SQL_USER", "user"),
'PASSWORD': os.environ.get("SQL_PASSWORD", "password"),
'HOST': os.environ.get("SQL_HOST", "localhost"),
'PORT': os.environ.get("SQL_PORT", "5432"),
}
}
I added a file named as .env.dev which is for better access to environment variables:
DEBUG=1
SECRET_KEY=123456
DJANGO_ALLOWED_HOSTS=localhost 127.0.0.1 [::1]
SQL_ENGINE=django.db.backends.postgresql
SQL_HOST=db
SQL_DB_NAME=contact_list
SQL_USER=user
SQL_PASSWORD=123456
SQL_PORT=5432
DATABASE=postgres

first try to login to mysql with provided credentials
docker exec -it <CONTAINER_ID> /bin/sh
Inside the docker please login to mysql via command line
mysql -uroot -psecretpassword

How to initialize a postgres container with data using .dump instead of .sql?

i've seen in the docs and many solution to initialize a postgres container with a database using an init.sql as mentioned in this question:
COPY init.sql /docker-entrypoint-initdb.d/10-init.sql
The problem is that my database data in .sql is to large(8GB). This makes the dump process to long and the file to heavy. I was trying to make something similar to this approach generating a .dump file with (540mb).
I have 2 containers to run my django project. A Dockerfile for my python environment and postgres image. My docker files are shown in the end of this question. So far i've managed to run the dump in my container with these steps:
I add my .dump file to my container in docker-compose
build my containers
Go inside my postgres container and execute a pg_restore command
to dump my database.
Then go to my python/django container to execute a migrate command.
And finally run server.
This works but its not automated. How can i automate this problem in my docker files so i don't need to execute these commands manually?
Bellow are my files and the commands i required to run my .dump file on postgres container:
generate and add ./project-dump/latest.dump to my project
docker-compose up -d web db #build containers
docker-compose exec db bash # go in my postgres container
pg_restore --verbose --clean --no-acl --no-owner -h {pg_container_name} -U postgres -d database_dev
exit # exit postgres container
docker-compose exec web bash # go in my python/django project container
./manage.py migrate # migrate database
./manage.py runserver 0.0.0.0:3000 #run server
Dockerfile:
FROM python:3.7.3-stretch
ENV PYTHONUNBUFFERED 1
RUN mkdir /code
WORKDIR /code
COPY requirements.txt /code/
RUN pip install -r requirements.txt
COPY . /code/
COPY init.sql /docker-entrypoint-initdb.d/10-init.sql
RUN python manage.py migrate
EXPOSE 3000
docker-compose.yaml
version: '3'
services:
db:
image: postgres
environment:
POSTGRES_USER: postgres
POSTGRES_DB: database_dev
POSTGRES_PASSWORD: secret
ports:
- "5432:5432"
volumes:
- ./project-dump/:/var/www/html
web:
build: .
command: python3 manage.py runserver 0.0.0.0:3000
volumes:
- .:/django-docker
ports:
- "3000:3000"
depends_on:
- db
init.sql
CREATE DATABASE database_dev;
GRANT ALL PRIVILEGES ON DATABASE database_dev TO postgres;