Currently I am trying to learn about Api development with FastAPI and I am trying to dockerize my project. However, when I try to run the database migrations with alembic in Docker by using docker run sm-api_api alembic upgrade head
I get the following error:
File "/usr/local/lib/python3.10/site-packages/sqlalchemy/engine/base.py", line 3280, in _wrap_pool_connect
return fn()
File "/usr/local/lib/python3.10/site-packages/sqlalchemy/pool/base.py", line 310, in connect
return _ConnectionFairy._checkout(self)
File "/usr/local/lib/python3.10/site-packages/sqlalchemy/pool/base.py", line 868, in _checkout
fairy = _ConnectionRecord.checkout(pool)
File "/usr/local/lib/python3.10/site-packages/sqlalchemy/pool/base.py", line 476, in checkout
rec = pool._do_get()
File "/usr/local/lib/python3.10/site-packages/sqlalchemy/pool/impl.py", line 256, in _do_get
return self._create_connection()
File "/usr/local/lib/python3.10/site-packages/sqlalchemy/pool/base.py", line 256, in _create_connection
return _ConnectionRecord(self)
File "/usr/local/lib/python3.10/site-packages/sqlalchemy/pool/base.py", line 371, in __init__
self.__connect()
File "/usr/local/lib/python3.10/site-packages/sqlalchemy/pool/base.py", line 665, in __connect
with util.safe_reraise():
File "/usr/local/lib/python3.10/site-packages/sqlalchemy/util/langhelpers.py", line 70, in __exit__
compat.raise_(
File "/usr/local/lib/python3.10/site-packages/sqlalchemy/util/compat.py", line 208, in raise_
raise exception
File "/usr/local/lib/python3.10/site-packages/sqlalchemy/pool/base.py", line 661, in __connect
self.dbapi_connection = connection = pool._invoke_creator(self)
File "/usr/local/lib/python3.10/site-packages/sqlalchemy/engine/create.py", line 590, in connect
return dialect.connect(*cargs, **cparams)
File "/usr/local/lib/python3.10/site-packages/sqlalchemy/engine/default.py", line 597, in connect
return self.dbapi.connect(*cargs, **cparams)
File "/usr/local/lib/python3.10/site-packages/psycopg2/__init__.py", line 122, in connect
conn = _connect(dsn, connection_factory=connection_factory, **kwasync)
psycopg2.OperationalError: connection to server at "localhost" (127.0.0.1), port 5432 failed: Connection refused
Is the server running on that host and accepting TCP/IP connections?
connection to server at "localhost" (::1), port 5432 failed: Cannot assign requested address
Is the server running on that host and accepting TCP/IP connections?
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "/usr/local/bin/alembic", line 8, in <module>
sys.exit(main())
File "/usr/local/lib/python3.10/site-packages/alembic/config.py", line 590, in main
CommandLine(prog=prog).main(argv=argv)
File "/usr/local/lib/python3.10/site-packages/alembic/config.py", line 584, in main
self.run_cmd(cfg, options)
File "/usr/local/lib/python3.10/site-packages/alembic/config.py", line 561, in run_cmd
fn(
File "/usr/local/lib/python3.10/site-packages/alembic/command.py", line 322, in upgrade
script.run_env()
File "/usr/local/lib/python3.10/site-packages/alembic/script/base.py", line 569, in run_env
util.load_python_file(self.dir, "env.py")
File "/usr/local/lib/python3.10/site-packages/alembic/util/pyfiles.py", line 94, in load_python_file
module = load_module_py(module_id, path)
File "/usr/local/lib/python3.10/site-packages/alembic/util/pyfiles.py", line 110, in load_module_py
spec.loader.exec_module(module) # type: ignore
File "<frozen importlib._bootstrap_external>", line 883, in exec_module
File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
File "/usr/src/app/alembic/env.py", line 81, in <module>
run_migrations_online()
File "/usr/src/app/alembic/env.py", line 69, in run_migrations_online
with connectable.connect() as connection:
File "/usr/local/lib/python3.10/site-packages/sqlalchemy/engine/base.py", line 3234, in connect
return self._connection_cls(self, close_with_result=close_with_result)
File "/usr/local/lib/python3.10/site-packages/sqlalchemy/engine/base.py", line 96, in __init__
else engine.raw_connection()
File "/usr/local/lib/python3.10/site-packages/sqlalchemy/engine/base.py", line 3313, in raw_connection
return self._wrap_pool_connect(self.pool.connect, _connection)
File "/usr/local/lib/python3.10/site-packages/sqlalchemy/engine/base.py", line 3283, in _wrap_pool_connect
Connection._handle_dbapi_exception_noconnection(
File "/usr/local/lib/python3.10/site-packages/sqlalchemy/engine/base.py", line 2117, in _handle_dbapi_exception_noconnection
util.raise_(
File "/usr/local/lib/python3.10/site-packages/sqlalchemy/util/compat.py", line 208, in raise_
raise exception
File "/usr/local/lib/python3.10/site-packages/sqlalchemy/engine/base.py", line 3280, in _wrap_pool_connect
return fn()
File "/usr/local/lib/python3.10/site-packages/sqlalchemy/pool/base.py", line 310, in connect
return _ConnectionFairy._checkout(self)
File "/usr/local/lib/python3.10/site-packages/sqlalchemy/pool/base.py", line 868, in _checkout
fairy = _ConnectionRecord.checkout(pool)
File "/usr/local/lib/python3.10/site-packages/sqlalchemy/pool/base.py", line 476, in checkout
rec = pool._do_get()
File "/usr/local/lib/python3.10/site-packages/sqlalchemy/pool/impl.py", line 256, in _do_get
return self._create_connection()
File "/usr/local/lib/python3.10/site-packages/sqlalchemy/pool/base.py", line 256, in _create_connection
return _ConnectionRecord(self)
File "/usr/local/lib/python3.10/site-packages/sqlalchemy/pool/base.py", line 371, in __init__
self.__connect()
File "/usr/local/lib/python3.10/site-packages/sqlalchemy/pool/base.py", line 665, in __connect
with util.safe_reraise():
File "/usr/local/lib/python3.10/site-packages/sqlalchemy/util/langhelpers.py", line 70, in __exit__
compat.raise_(
File "/usr/local/lib/python3.10/site-packages/sqlalchemy/util/compat.py", line 208, in raise_
raise exception
File "/usr/local/lib/python3.10/site-packages/sqlalchemy/pool/base.py", line 661, in __connect
self.dbapi_connection = connection = pool._invoke_creator(self)
File "/usr/local/lib/python3.10/site-packages/sqlalchemy/engine/create.py", line 590, in connect
return dialect.connect(*cargs, **cparams)
File "/usr/local/lib/python3.10/site-packages/sqlalchemy/engine/default.py", line 597, in connect
return self.dbapi.connect(*cargs, **cparams)
File "/usr/local/lib/python3.10/site-packages/psycopg2/__init__.py", line 122, in connect
conn = _connect(dsn, connection_factory=connection_factory, **kwasync)
sqlalchemy.exc.OperationalError: (psycopg2.OperationalError) connection to server at "localhost" (127.0.0.1), port 5432 failed: Connection refused
Is the server running on that host and accepting TCP/IP connections?
connection to server at "localhost" (::1), port 5432 failed: Cannot assign requested address
Is the server running on that host and accepting TCP/IP connections?
(Background on this error at: https://sqlalche.me/e/14/e3q8)
My docker compose file is like this:
version: '3'
services:
api:
build: .
depends_on:
- postgres
ports:
- 8000:8000
environment:
- DATABASE_HOSTNAME=${DATABASE_HOST}
- DATABASE_PORT=${DATABASE_PORT}
- DATABASE_PASSWORD=${DATABASE_PASSWORD}
- DATABASE_NAME=${DATABASE_NAME}
- DATABASE_USERNAME=${DATABASE_USERNAME}
- SECRET_KEY=${SECRET_KEY}
- ALGORITHM=${ALGORITHM}
- ACCESS_TOKEN_EXPIRE_MINUTES=${ACCESS_TOKEN_EXPIRE_TIME}
postgres:
image: postgres
environment:
- POSTGRES_PASSWORD=${DATABASE_PASSWORD}
- POSTGRES_DB=${DATABASE_NAME}
ports:
- 5432:5432
volumes:
- postgres-db:/var/lib/postgresql/data
volumes:
postgres-db:
I already tried to kill the port and run it again, but it did not solve my problem. Does anyone know what the problem is?
Edit: My Docker file:
FROM python:3.10.5
WORKDIR /usr/src/app
COPY requirements.txt ./
RUN pip install --no-cache-dir -r requirements.txt
COPY . .
CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]
And my .env file:
DATABASE_HOST=localhost
DATABASE_PORT=5432
DATABASE_PASSWORD={password}
DATABASE_NAME=SM_API
DATABASE_USERNAME=postgres
SECRET_KEY={secret key}
ALGORITHM=HS256
ACCESS_TOKEN_EXPIRE_TIME = 30
CodePudding user response:
You are connecting to localhost (or 127.0.0.1) which is, from the container point of view, itself. You probably want to change that line in your docker compose as DATABASE_HOSTNAME=postgres
, so it refers to the postgres container.
CodePudding user response:
Taking a look at the following snippet
conn = _connect(dsn, connection_factory=connection_factory, **kwasync) psycopg2.OperationalError:
connection to server at "localhost" (127.0.0.1)
, port 5432 failed: Connection refused Is the server running on that host and accepting TCP/IP connections?
Maybe as the DATABASE_HOSTNAME
you pass 127.0.0.1
?
From the container's point of view its loopback interface doesn't accept any connections at 5432, your host machine does tho.
You should refer to the postgres container instead. Since the services in docker compose are discoverable you could use service name.
Try
- DATABASE_HOSTNAME=postgres