I have a Django application that uses Python 2.7.10 and Django 1.10.3. My Dockerfile contains the following:
FROM python:2.7.10
ENV PYTHONUNBUFFERED 1
RUN mkdir /code
WORKDIR /code
ADD requirements.txt /code/
RUN pip install -r requirements.txt
ADD . /code/
My requirements.txt contains the following:
Django>=1.10,<2.0
Mysql-python
My docker-compose.yml contains the following:
version: '2'
services:
localhost:
image: mysql
restart: always
environment:
MYSQL_DATABASE: 'test'
MYSQL_USER: 'test'
MYSQL_PASSWORD: 'password'
web:
build: .
command: python manage.py runserver 0.0.0.0:8000
volumes:
- .:/code
ports:
- "8000:8000"
depends_on:
- localhost
settings.py contains the following for the database:
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.mysql',
'NAME': 'test',
'USER': 'test',
'PASSWORD': 'password',
'HOST': 'localhost',
'PORT': '3306',
}
I first do a "% docker-compose build", then I do a "% docker-compose up" and get the following error:
web_1 | django.db.utils.OperationalError: (2002, "Can't connect
to local MySQL server through socket '/var/run/mysqld/mysqld.sock'
I've looked and tried the solutions available on Stackoverflow with no luck. Any help would be much appreciated.
Any help would be much appreciated.
In regards to MySql and Django App relation you have three possible cases:
MySql is residing on same container as Django App (localhost)
MySql is residing on separate container from Django App (hostname is different, can be handled on different topology - same subnet or different etc)
MySql is residing outside of docker ecosystem (bare metal, cloud, whatever...)
Judging from your settings.py and docker-compose.yml you are mixing first two approaches. Now, since you can reference external MySql server from settings.py I'll consider that case trivial, next, cramming MySql on same container as Django App is usually bad idea (if you ever want to scale them separately) so this answer will focus on second case (MySql in separate container) and, for simplicity, on same docker-compose file (you can separate them as well).
Important excerpt from docker-compose.yml is:
version: '2'
services:
# The Database
database:
image: mysql:5.6
volumes:
- dbdata:/var/lib/mysql
environment:
- "MYSQL_DATABASE=test_db"
- "MYSQL_USER=test_user"
- "MYSQL_PASSWORD=some_password"
- "MYSQL_ROOT_PASSWORD=some_root_password"
ports:
- "33061:3306"
container_name: "mysql_database"
# Django App (taken from your example, added env vars as hint)
web:
build: .
command: python manage.py runserver 0.0.0.0:8000
environment:
- "DB_PORT=3306"
- "DB_HOST=database"
volumes:
- .:/code
ports:
- "8000:8000"
depends_on:
- database
volumes:
dbdata:
With such docker-compose you would have following setting.py config (note that HOST is taking value of docker-compose service entry for database container, port is internal to container not external to docker-host):
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.mysql',
'NAME': 'test_db',
'USER': 'test_user',
'PASSWORD': 'some_password',
'HOST': 'database',
'PORT': '3306',
}
As a sidenote, we usually run database with separate docker-compose.yml from Django App file since in usual dev cycle it is far more frequent to tweak/restart/crash something on Django App container than on database one and we can handle it separately that way, plus such a separately defined database can handle several different DjangoApps each with its own container.
Related
I'm trying to dockerize my Django project, but my database container seems to not be working. When I initialize docker-compose up the server starts but there is a message telling me I have 53 unapplied migrations (all), and run python manage.py migrate to migrate (like it is a blank database). My docker-compose looks like this:
services:
db:
image: postgres
volumes:
- ./data/db:/var/lib/postgresql/data
environment:
- POSTGRES_DB=database_name
- POSTGRES_USER=database_admin
- POSTGRES_PASSWORD=pskfnbiu42834h
web:
build: .
command: python manage.py runserver 0.0.0.0:8000
volumes:
- .:/code
ports:
- "8000:8000"
environment:
- POSTGRES_DB=database_name
- POSTGRES_USER=database_admin
- POSTGRES_PASSWORD=pskfnbiu42834h
depends_on:
- db
And I changed my settings.py DATABASE to this:
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.postgresql_psycopg2',
'NAME': os.environ.get('POSTGRES_NAME'),
'USER': os.environ.get('POSTGRES_USER'),
'PASSWORD': os.environ.get('POSTGRES_PASSWORD'),
'HOST': 'db',
'PORT': '5432',
}
}
I think the problem might have to do with the volumes part. Docker created a data folder in my project directory with PostgreSQL related files. Where do those /var/lib/ folder live? Anyone can give any orientation?
Hello I can not dockerize my django app because I got an error -
listen tcp4 0.0.0.0:5433: bind: address already in use
From the other hand, when I "kill" 5433 port in ubuntu terminal I get this error
Is the server running on host "localhost" (::1) and accepting
web_1 | TCP/IP connections on port 5433?
What can I do to solve this problem and dockerize successfully my app?
Dockerfile
FROM python:3
RUN adduser --system --no-create-home django
ENV PYTHONUNBUFFERED=1
WORKDIR /code
COPY requirements.txt .
RUN pip install -r requirements.txt
COPY . .
ENV PYTHONPATH /code
EXPOSE 8000
USER django
CMD ["./main.py"]
docker-compose
version: "3"
services:
db:
image: postgres
volumes:
- ./data/db:/var/lib/postgresql/data
environment:
- POSTGRES_DB=fitshop
- POSTGRES_USER=fituser
- POSTGRES_PASSWORD=fitpass
ports:
- "5433:5433"
web:
build: .
command: python manage.py runserver 0.0.0.0:8000
volumes:
- .:/code
restart: always
ports:
- "8000:8000"
depends_on:
- db
settings.py
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.postgresql_psycopg2',
'NAME': 'fitshop',
'USER': 'fituser',
'PASSWORD': 'fitpass',
'HOST': 'localhost',
'PORT': '5433',
}
}
You should use "db" as host here. In a docker-compose setup each service is started in a separate Container and the /etc/hosts config of all containers is modified so, that each container can find the other containers via the service names.
I`ve got it!. In 'localhost" port of postgres was 5433 but for 'db' as HOST it was default, 5432.
I have a problem when I create any object in my django admin. It shows me this error:
LINE 1: SELECT (1) AS "a" FROM "license_portal_client" WHERE
Here is my Dockerfile:
FROM python:3
ENV PYTHONUNBUFFERED 1
RUN mkdir /code
WORKDIR /code
COPY requirements.txt /code/
RUN pip install -r requirements.txt
COPY . /code/
Here is my docker-compose.yml:
version: '3'
services:
db:
image: postgres
environment:
- POSTGRES_DB=postgres
- POSTGRES_USER=postgres
- POSTGRES_PASSWORD=postgres
web:
build: .
command: python license_portal/manage.py runserver 0.0.0.0:8000
volumes:
- .:/code
ports:
- "8000:8000"
depends_on:
- db
My database settings.py and I have added my app on installed apps:
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.postgresql',
'NAME': 'postgres',
'USER': 'postgres',
'PASSWORD': 'postgres',
'HOST': 'db',
'PORT': 5432,
}
}
And here is my models.py:
from django.db import models
class Person(models.Model):
first_name = models.CharField(max_length=30)
last_name = models.CharField(max_length=30)
And my admin.py:
from django.contrib import admin
from license_portal.models import Person
admin.site.register(Person)
This is likely due to your database not being migrated. Try running the django migrate command from within a django container and stop any existing database connections you may have -- like the web container running the development server.
# Stop all of the running containers to release all db connections
docker-compose stop
# Run the migrate command inside of the django container
docker-compose run web python license_portal/manage.py migrate
# Start all of the containers again to access your dev server
docker-compose up web
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
I'm new to Docker, and I'm trying to put my Django rest API in a container with Nginx, Gunicorn and Postgres, using docker-compose and docker-machine. Following this tutorial: https://realpython.com/blog/python/django-development-with-docker-compose-and-machine/
Most of my code is the same as the tutorial's (https://github.com/realpython/dockerizing-django). with some minor name changes.
this my docker-compose.yml (I changed the gunicorn command to runserver for debugging purposes)
web:
restart: always
build: ./web
expose:
- "8000"
links:
- postgres:postgres
- redis:redis
volumes:
- /usr/src/app
- /usr/src/app/static
env_file: .env
environment:
DEBUG: 'true'
command: /usr/local/bin/python manage.py runserver
nginx:
restart: always
build: ./nginx/
ports:
- "80:80"
volumes:
- /www/static
volumes_from:
- web
links:
- web:web
postgres:
restart: always
image: postgres:latest
ports:
- "5432:5432"
volumes:
- pgdata:/var/lib/postgresql/data/
redis:
restart: always
image: redis:latest
ports:
- "6379:6379"
volumes:
- redisdata:/data
And this is in my settings.py of Django:
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.postgresql_psycopg2',
'NAME': 'postgres',
'USER': 'postgres',
'PASSWORD': 'postgres',
'HOST': 'postgres',
'PORT': '5432',
}
}
Nginx and postgres (and redis) are up and running, however my django server wont start, by this error:
web_1 | django.db.utils.OperationalError: could not connect to server: Connection refused
web_1 | Is the server running on host "localhost" (::1) and accepting
web_1 | TCP/IP connections on port 5432?
web_1 | could not connect to server: Connection refused
web_1 | Is the server running on host "localhost" (127.0.0.1) and accepting
web_1 | TCP/IP connections on port 5432?
I've googled a lot and I've verified that postgres is running, on port 5432, I can connect to it using psql command .
I am lost. What is my mistake?
EDIT: It appears that it is not using my settings.py file or something, since it's asking if the server is running on localhost, while settings should be looking for postgres.
When those who have this problem please check your settings.py:
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.postgresql_psycopg2',
'NAME': 'dbname',
'USER': 'user',
'PASSWORD': 'password',
'HOST': 'db'
}
}
Your HOST:'db' and docker-compose file db name should be same. If you want to rename from db, make sure that you change in docker-compose file and setting.py:
db:
restart: always
image: postgres:latest
ports:
- "5432:5432"
volumes:
- pgdata:/var/lib/postgresql/data/
Checkout your manage.py,
there should be a line
os.environ.setdefault("DJANGO_SETTINGS_MODULE", "myproject.settings")
if there is no such line, put it
set your DJANGO_SETTINGS_MODULE with respect to PYTHONPATH.
UPD i cloned your repo and launched the web service by changing command in docker-compose.yml
- command: /usr/local/bin/gunicorn docker_django.wsgi:application -w 2 -b :8000
+ command: python manage.py runserver 0.0.0.0:8000
I'm sure DJANGO_SETTINGS_MODULE is correct.
I'm exactly facing the same issue, while runing my django app with docker on aws ec2 instance.
I noticed that this error only happend for the first time the docker image is build, so to fix i juste ran :
CTRL + C then docker-compose up again and everything worked fine.