Got a psycopg2.OperationalError timeout error

[mglslg]

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Dify version

0.6.2

Cloud or Self Hosted

Self Hosted (Docker)

Steps to reproduce

I checkout the source code from main branch. And use docker compose up -d to start my containers. They are all started except one:docker-api-1

CONTAINER ID   IMAGE                              COMMAND                  CREATED       STATUS                 PORTS                NAMES
2d3a485a7cd6   nginx:latest                       "/docker-entrypoint.…"   2 hours ago   Up 2 hours             0.0.0.0:80->80/tcp   docker-nginx-1
009f31319cb2   langgenius/dify-api:0.6.2          "/bin/bash /entrypoi…"   2 hours ago   Up About a minute      5001/tcp             docker-api-1
e8c49dc468d3   langgenius/dify-api:0.6.2          "/bin/bash /entrypoi…"   2 hours ago   Up 2 hours             5001/tcp             docker-worker-1
03b7c44d8998   postgres:15-alpine                 "docker-entrypoint.s…"   2 hours ago   Up 2 hours (healthy)   5432/tcp             docker-db-1
e70e3d5a4421   redis:6-alpine                     "docker-entrypoint.s…"   2 hours ago   Up 2 hours (healthy)   6379/tcp             docker-redis-1
d0b69efc047c   langgenius/dify-sandbox:latest     "/main"                  2 hours ago   Up 2 hours                                  docker-sandbox-1
416e66787d49   semitechnologies/weaviate:1.19.0   "/bin/weaviate --hos…"   2 hours ago   Up 2 hours                                  docker-weaviate-1
eefc2b289aa3   langgenius/dify-web:0.6.2          "/bin/sh ./entrypoin…"   2 hours ago   Up 2 hours             3000/tcp             docker-web-1

I found that this container was restarting frequently, so I executed docker logs to check the logs and found the following error reported:

Traceback (most recent call last):
  File "/usr/local/bin/flask", line 8, in <module>
    sys.exit(main())
  File "/usr/local/lib/python3.10/site-packages/flask/cli.py", line 1105, in main
    cli.main()
  File "/usr/local/lib/python3.10/site-packages/click/core.py", line 1078, in main
    rv = self.invoke(ctx)
  File "/usr/local/lib/python3.10/site-packages/click/core.py", line 1688, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/local/lib/python3.10/site-packages/click/core.py", line 1688, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/local/lib/python3.10/site-packages/click/core.py", line 1434, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/local/lib/python3.10/site-packages/click/core.py", line 783, in invoke
    return __callback(*args, **kwargs)
  File "/usr/local/lib/python3.10/site-packages/click/decorators.py", line 33, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "/usr/local/lib/python3.10/site-packages/flask/cli.py", line 386, in decorator
    return ctx.invoke(f, *args, **kwargs)
  File "/usr/local/lib/python3.10/site-packages/click/core.py", line 783, in invoke
    return __callback(*args, **kwargs)
  File "/usr/local/lib/python3.10/site-packages/flask_migrate/cli.py", line 154, in upgrade
    _upgrade(directory, revision, sql, tag, x_arg)
  File "/usr/local/lib/python3.10/site-packages/flask_migrate/__init__.py", line 111, in wrapped
    f(*args, **kwargs)
  File "/usr/local/lib/python3.10/site-packages/flask_migrate/__init__.py", line 200, in upgrade
    command.upgrade(config, revision, sql=sql, tag=tag)
  File "/usr/local/lib/python3.10/site-packages/alembic/command.py", line 403, in upgrade
    script.run_env()
  File "/usr/local/lib/python3.10/site-packages/alembic/script/base.py", line 583, in run_env
    util.load_python_file(self.dir, "env.py")
  File "/usr/local/lib/python3.10/site-packages/alembic/util/pyfiles.py", line 95, in load_python_file
    module = load_module_py(module_id, path)
  File "/usr/local/lib/python3.10/site-packages/alembic/util/pyfiles.py", line 113, 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 "/app/api/migrations/env.py", line 112, in <module>
    run_migrations_online()
  File "/app/api/migrations/env.py", line 96, in run_migrations_online
    with connectable.connect() as connection:
  File "/usr/local/lib/python3.10/site-packages/sqlalchemy/engine/base.py", line 3325, 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 3404, 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 3374, in _wrap_pool_connect
    Connection._handle_dbapi_exception_noconnection(
  File "/usr/local/lib/python3.10/site-packages/sqlalchemy/engine/base.py", line 2208, in _handle_dbapi_exception_noconnection
    util.raise_(
  File "/usr/local/lib/python3.10/site-packages/sqlalchemy/util/compat.py", line 211, in raise_
    raise exception
  File "/usr/local/lib/python3.10/site-packages/sqlalchemy/engine/base.py", line 3371, in _wrap_pool_connect
    return fn()
  File "/usr/local/lib/python3.10/site-packages/sqlalchemy/pool/base.py", line 327, in connect
    return _ConnectionFairy._checkout(self)
  File "/usr/local/lib/python3.10/site-packages/sqlalchemy/pool/base.py", line 894, in _checkout
    fairy = _ConnectionRecord.checkout(pool)
  File "/usr/local/lib/python3.10/site-packages/sqlalchemy/pool/base.py", line 493, in checkout
    rec = pool._do_get()
  File "/usr/local/lib/python3.10/site-packages/sqlalchemy/pool/impl.py", line 145, in _do_get
    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 211, in raise_
    raise exception
  File "/usr/local/lib/python3.10/site-packages/sqlalchemy/pool/impl.py", line 143, in _do_get
    return self._create_connection()
  File "/usr/local/lib/python3.10/site-packages/sqlalchemy/pool/base.py", line 273, in _create_connection
    return _ConnectionRecord(self)
  File "/usr/local/lib/python3.10/site-packages/sqlalchemy/pool/base.py", line 388, in __init__
    self.__connect()
  File "/usr/local/lib/python3.10/site-packages/sqlalchemy/pool/base.py", line 690, 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 211, in raise_
    raise exception
  File "/usr/local/lib/python3.10/site-packages/sqlalchemy/pool/base.py", line 686, in __connect
    self.dbapi_connection = connection = pool._invoke_creator(self)
  File "/usr/local/lib/python3.10/site-packages/sqlalchemy/engine/create.py", line 574, in connect
    return dialect.connect(*cargs, **cparams)
  File "/usr/local/lib/python3.10/site-packages/sqlalchemy/engine/default.py", line 598, 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 "db" (172.18.0.4), port 5432 failed: Connection timed out
	Is the server running on that host and accepting TCP/IP connections?

✔️ Expected Behavior

Start docker-api-1 normally

❌ Actual Behavior

This container keeps throwing exceptions and restarting over and over again.

[dosubot[bot]]

The issue with the docker-api-1 container failing to connect to the PostgreSQL database could be due to several factors, including configuration mismatches, network issues, or the database not being fully ready when the application attempts to connect. Here's a structured approach to troubleshoot and potentially resolve the problem:

1. Verify PostgreSQL Configuration: Ensure the environment variables for the database connection in your api service (DB_USERNAME, DB_PASSWORD, DB_DATABASE) match those in your db service (POSTGRES_USER, POSTGRES_PASSWORD, POSTGRES_DB).

2. Inspect Database Logs: Use docker-compose logs db to check if the PostgreSQL database is initialized correctly and running without issues.

3. Check Network Accessibility: Confirm there's no network configuration or firewall blocking communication between the api and db services. In Docker Compose, services communicate using service names as hostnames.

4. Adjust Connection Timeout: If the issue is a timeout, consider increasing the timeout setting in your database connection configuration, specifically adding a connect_timeout option for psycopg2.

5. Restart Docker Services: After any configuration changes, restart your services with docker-compose down and docker-compose up -d to apply the changes.

If these steps do not resolve the issue, further investigation into the api service logs or adjusting PostgreSQL's logging for more detailed error messages might be necessary.

Sources

• 0.3.20 docker compose部署后，无法对话，确定openai 反代地址有效，key有效，好像是在向量化上出现问题了
• unable to run local
• docker/docker-compose.yaml

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[crazywoola]

Either you have a running pg in your machine or the db has failed to start.

[mglslg]

Either you have a running pg in your machine or the db has failed to start.

Thank you for your reply. But I don't have a PostgreSQL on the server, this server is clean, only Docker has been installed.

[mglslg]

The problem is solved. After fussing for most of the day, it turned out that restarting Docker did the trick... It was such a pitfall.