so I have this problem building django/postgre app with docker. it keeps saying “database does not exist” and quite few time googling doesnt bring any results. I already scrapped the volumes and rebuilt my app few times, followed different guides on how people do the postgres, still no luck making it work for me. Dockerfile
FROM python:3.9.6-alpine
WORKDIR /blog-master
# set environment variables
ENV PYTHONDONTWRITEBYTECODE 1
ENV PYTHONUNBUFFERED 1
# install psycopg2 dependencies
RUN apk update
&& apk add postgresql-dev gcc python3-dev musl-dev
RUN pip install --upgrade pip
RUN apk update
&& apk add postgresql-dev gcc python3-dev musl-dev
COPY requirements.txt .
RUN pip install -r requirements.txt
COPY . .
compose.yml
services:
back:
image: python:3.9
build: ./blog-master
command: sh -c "python manage.py runserver 0.0.0.0:8000 &&
/usr/local/bin/gunicorn blog.wsgi:application -w 2 -b :8000"
expose:
- "8000"
volumes:
- blog-master-django:/usr/src/app
- blog-master-static:/usr/src/app/static
env_file: .env
links:
- db
depends_on:
db:
condition: service_healthy
db:
image: postgres:14
restart: always
expose:
- "5432"
environment:
- POSTGRES_DB=docker_db
- POSTGRES_USER=docker
- POSTGRES_PASSWORD=docker
ports:
- "5432:5432"
volumes:
- pgdata:/var/lib/postgresql/data/
healthcheck:
test: ["CMD-SHELL", "pg_isready -U docker"]
interval: 5s
timeout: 5s
retries: 5
volumes:
blog-master-django:
blog-master-static:
pgdata:
.env
DEBUG=1 SECRET_KEY='**key-here**' DJANGO_ALLOWED_HOSTS=localhost 127.0.0.1 [::1] SQL_ENGINE=django.db.backends.postgresql SQL_DATABASE=docker_db SQL_USER=docker SQL_PASSWORD=docker SQL_HOST=db SQL_PORT=5432
UPDATE: Error messages starts with
db_1 | 2022-09-29 15:33:58.432 UTC [1] LOG: database system is ready to accept connections db_1 | 2022-09-29 15:34:03.467 UTC [40] FATAL: database "docker" does not exist
and then my django starts spamming the same
back_1 | psycopg2.OperationalError: FATAL: database "docker_db" does not exist
but the weird thing is, then it proceeds giving same errors from db, but
db_1 | 2022-09-29 15:34:23.801 UTC [73] FATAL: database "docker" does not exist
this time it says “database ‘docker'” but I dont have DB name “docker” used in my code
Full error:
Recreating blog-showcase_db_1 ... done Recreating blog-showcase_back_1 ... done Attaching to blog-showcase_db_1, blog-showcase_back_1 db_1 | db_1 | PostgreSQL Database directory appears to contain a database; Skipping initialization db_1 | db_1 | 2022-09-29 15:33:58.392 UTC [1] LOG: starting PostgreSQL 14.5 (Debian 14.5-1.pgdg110+1) on x86_64-pc-linux-gnu, compiled by gcc (Debian 10.2.1-6) 10.2.1 20210110, 64-bit db_1 | 2022-09-29 15:33:58.393 UTC [1] LOG: listening on IPv4 address "0.0.0.0", port 5432 db_1 | 2022-09-29 15:33:58.393 UTC [1] LOG: listening on IPv6 address "::", port 5432 db_1 | 2022-09-29 15:33:58.399 UTC [1] LOG: listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432" db_1 | 2022-09-29 15:33:58.416 UTC [26] LOG: database system was shut down at 2022-09-29 15:33:44 UTC db_1 | 2022-09-29 15:33:58.432 UTC [1] LOG: database system is ready to accept connections db_1 | 2022-09-29 15:34:03.467 UTC [40] FATAL: database "docker" does not exist back_1 | Watching for file changes with StatReloader back_1 | Performing system checks... back_1 | back_1 | System check identified no issues (0 silenced). db_1 | 2022-09-29 15:34:05.823 UTC [41] FATAL: database "docker_db" does not exist back_1 | Exception in thread django-main-thread: back_1 | Traceback (most recent call last): back_1 | File "/usr/local/lib/python3.9/site-packages/django/db/backends/base/base.py", line 244, in ensure_connection back_1 | self.connect() back_1 | File "/usr/local/lib/python3.9/site-packages/django/utils/asyncio.py", line 26, in inner back_1 | return func(*args, **kwargs) back_1 | File "/usr/local/lib/python3.9/site-packages/django/db/backends/base/base.py", line 225, in connect back_1 | self.connection = self.get_new_connection(conn_params) back_1 | File "/usr/local/lib/python3.9/site-packages/django/utils/asyncio.py", line 26, in inner back_1 | return func(*args, **kwargs) back_1 | File "/usr/local/lib/python3.9/site-packages/django/db/backends/postgresql/base.py", line 203, in get_new_connection back_1 | connection = Database.connect(**conn_params) back_1 | File "/usr/local/lib/python3.9/site-packages/psycopg2/__init__.py", line 122, in connect back_1 | conn = _connect(dsn, connection_factory=connection_factory, **kwasync) back_1 | psycopg2.OperationalError: FATAL: database "docker_db" does not exist back_1 | back_1 | back_1 | The above exception was the direct cause of the following exception: back_1 | back_1 | Traceback (most recent call last): back_1 | File "/usr/local/lib/python3.9/threading.py", line 973, in _bootstrap_inner back_1 | self.run() back_1 | File "/usr/local/lib/python3.9/threading.py", line 910, in run back_1 | self._target(*self._args, **self._kwargs) back_1 | File "/usr/local/lib/python3.9/site-packages/django/utils/autoreload.py", line 64, in wrapper back_1 | fn(*args, **kwargs) back_1 | File "/usr/local/lib/python3.9/site-packages/django/core/management/commands/runserver.py", line 137, in inner_run back_1 | self.check_migrations() back_1 | File "/usr/local/lib/python3.9/site-packages/django/core/management/base.py", line 576, in check_migrations back_1 | executor = MigrationExecutor(connections[DEFAULT_DB_ALIAS]) back_1 | File "/usr/local/lib/python3.9/site-packages/django/db/migrations/executor.py", line 18, in __init__ back_1 | self.loader = MigrationLoader(self.connection) back_1 | File "/usr/local/lib/python3.9/site-packages/django/db/migrations/loader.py", line 58, in __init__ back_1 | self.build_graph() back_1 | File "/usr/local/lib/python3.9/site-packages/django/db/migrations/loader.py", line 235, in build_graph back_1 | self.applied_migrations = recorder.applied_migrations() back_1 | File "/usr/local/lib/python3.9/site-packages/django/db/migrations/recorder.py", line 81, in applied_migrations back_1 | if self.has_table(): back_1 | File "/usr/local/lib/python3.9/site-packages/django/db/migrations/recorder.py", line 57, in has_table back_1 | with self.connection.cursor() as cursor: back_1 | File "/usr/local/lib/python3.9/site-packages/django/utils/asyncio.py", line 26, in inner back_1 | return func(*args, **kwargs) back_1 | File "/usr/local/lib/python3.9/site-packages/django/db/backends/base/base.py", line 284, in cursor back_1 | return self._cursor() back_1 | File "/usr/local/lib/python3.9/site-packages/django/db/backends/base/base.py", line 260, in _cursor back_1 | self.ensure_connection() back_1 | File "/usr/local/lib/python3.9/site-packages/django/utils/asyncio.py", line 26, in inner back_1 | return func(*args, **kwargs) back_1 | File "/usr/local/lib/python3.9/site-packages/django/db/backends/base/base.py", line 244, in ensure_connection back_1 | self.connect() back_1 | File "/usr/local/lib/python3.9/site-packages/django/db/utils.py", line 91, in __exit__ back_1 | raise dj_exc_value.with_traceback(traceback) from exc_value back_1 | File "/usr/local/lib/python3.9/site-packages/django/db/backends/base/base.py", line 244, in ensure_connection back_1 | self.connect() back_1 | File "/usr/local/lib/python3.9/site-packages/django/utils/asyncio.py", line 26, in inner back_1 | return func(*args, **kwargs) back_1 | File "/usr/local/lib/python3.9/site-packages/django/db/backends/base/base.py", line 225, in connect back_1 | self.connection = self.get_new_connection(conn_params) back_1 | File "/usr/local/lib/python3.9/site-packages/django/utils/asyncio.py", line 26, in inner back_1 | return func(*args, **kwargs) back_1 | File "/usr/local/lib/python3.9/site-packages/django/db/backends/postgresql/base.py", line 203, in get_new_connection back_1 | connection = Database.connect(**conn_params) back_1 | File "/usr/local/lib/python3.9/site-packages/psycopg2/__init__.py", line 122, in connect back_1 | conn = _connect(dsn, connection_factory=connection_factory, **kwasync) back_1 | django.db.utils.OperationalError: FATAL: database "docker_db" does not exist back_1 | db_1 | 2022-09-29 15:34:08.544 UTC [49] FATAL: database "docker" does not exist db_1 | 2022-09-29 15:34:13.628 UTC [57] FATAL: database "docker" does not exist db_1 | 2022-09-29 15:34:18.720 UTC [65] FATAL: database "docker" does not exist db_1 | 2022-09-29 15:34:23.801 UTC [73] FATAL: database "docker" does not exist ^CGracefully stopping... (press Ctrl+C again to force) Stopping blog-showcase_back_1 ... done Stopping blog-showcase_db_1 ... done
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Answer
So, the answer was pretty simple and pretty “I don’t know what was that”.
First thing, I forgot to add DATABASE=postgres in my .env file, which was crucial for Django to notice the needed db
The problem with db searching for not-asked-for db? No idea, I just renamed needed db to “docker”, which my db service looked for, and it worked.