After building the container there is an error in the logs

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I want to make a container for FastAPI authorization application to learn microservices. I have chosen PostgresSQL as the database and it seems that the build was successful, but now in the container with the application the logs say the same thing (bash: line 1: dev/tcp/posrgres/5432: No such file or directory).

Attaching to authorization_app, posrgres_db
authorization_app  | bash: line 1: dev/tcp/posrgres/5432: No such file or directory
posrgres_db        | 
posrgres_db        | PostgreSQL Database directory appears to contain a database; Skipping initialization
posrgres_db        |                                                                                                                                                                                                                                                    
posrgres_db        | 2024-08-13 15:34:35.624 UTC [1] LOG:  starting PostgreSQL 16.4 (Debian 16.4-1.pgdg120+1) on x86_64-pc-linux-gnu, compiled by gcc (Debian 12.2.0-14) 12.2.0, 64-bit
posrgres_db        | 2024-08-13 15:34:35.624 UTC [1] LOG:  listening on IPv4 address "0.0.0.0", port 5432
posrgres_db        | 2024-08-13 15:34:35.625 UTC [1] LOG:  listening on IPv6 address "::", port 5432                                                                                                                                                                    
posrgres_db        | 2024-08-13 15:34:35.642 UTC [1] LOG:  listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432"                                                                                                                                                 
posrgres_db        | 2024-08-13 15:34:35.683 UTC [29] LOG:  database system was interrupted; last known up at 2024-08-13 15:34:03 UTC                                                                                                                                   
authorization_app  | bash: line 1: dev/tcp/posrgres/5432: No such file or directory
authorization_app  | bash: line 1: dev/tcp/posrgres/5432: No such file or directory
authorization_app  | bash: line 1: dev/tcp/posrgres/5432: No such file or directory
authorization_app  | bash: line 1: dev/tcp/posrgres/5432: No such file or directory
authorization_app  | bash: line 1: dev/tcp/posrgres/5432: No such file or directory
posrgres_db        | 2024-08-13 15:34:40.325 UTC [29] LOG:  database system was not properly shut down; automatic recovery in progress
posrgres_db        | 2024-08-13 15:34:40.362 UTC [29] LOG:  invalid record length at 0/1912180: expected at least 24, got 0
posrgres_db        | 2024-08-13 15:34:40.362 UTC [29] LOG:  redo is not required
posrgres_db        | 2024-08-13 15:34:40.408 UTC [27] LOG:  checkpoint starting: end-of-recovery immediate wait                                                                                                                                                         
posrgres_db        | 2024-08-13 15:34:40.499 UTC [27] LOG:  checkpoint complete: wrote 3 buffers (0.0%); 0 WAL file(s) added, 0 removed, 0 recycled; write=0.024 s, sync=0.012 s, total=0.100 s; sync files=2, longest=0.007 s, average=0.006 s; distance=0 kB, estimate=0 kB; lsn=0/1912180, redo lsn=0/1912180
posrgres_db        | 2024-08-13 15:34:40.511 UTC [1] LOG:  database system is ready to accept connections
authorization_app  | bash: line 1: dev/tcp/posrgres/5432: No such file or directory                                                                                                                                                                                     
authorization_app  | bash: line 1: dev/tcp/posrgres/5432: No such file or directory
authorization_app  | bash: line 1: dev/tcp/posrgres/5432: No such file or directory

Here is my compose file and Dockerfile

services:
  app:
    container_name: authorization_app
    build: ./
    depends_on:
      - db
    command: bash -c 'while !<dev/tcp/posrgres/5432; do sleep 1; done; uvicorn main:app --host 0.0.0.0 --port 8000'
    volumes:
      - ./app:/src/app
    ports:
      - ${APP_HOST_PORT}:8000
    restart: always
    env_file:
      - .env
  db:
    container_name: posrgres_db
    image: postgres
    environment:
      - POSTGRES_DB=database
      - POSTGRES_PASSWORD=mypas
      - POSTGRESS_DB_USER=${POSTGRESS_DB_USER}
      - POSTGRESS_DB_PASSWORD=${POSTGRESS_DB_PASSWORD}
    ports:
      - ${POSTGRESS_DB_HOST_PORT}:5432
    volumes:
      - ./postgres:/var/lib/postgresql/data
    restart: always


FROM python:3.10

WORKDIR /src

ENV PYTHONDONTWRITEBYTECODE 1
ENV PYTHONUNBUFFERED 1

COPY requirements.txt requirements.txt

RUN pip install --no-cache-dir --upgrade -r requirements.txt

COPY . .

I’m still figuring it out, so it could be a simple mistake.

Here are the directories
image

Simple code to test the operation in main.py

from fastapi import FastAPI

app = FastAPI()


@app.get("/")
def get_home():
    return {"message": "Hello World"}
2

Everything worked after the changes

Dockerfile

FROM python:3.10

WORKDIR /src

ENV PYTHONDONTWRITEBYTECODE 1
ENV PYTHONUNBUFFERED 1

COPY requirements.txt requirements.txt

RUN pip install --no-cache-dir --upgrade -r requirements.txt

COPY . .

CMD ["python3", "./app/main.py"]

Compose

services:
  app:
    container_name: authorization_app
    build: ./
    depends_on:
      - db
    ports:
      - ${APP_HOST_PORT}:8000
    restart: always
    env_file:
      - .env
  db:
    container_name: posrgres_db
    image: postgres
    environment:
      - POSTGRES_DB=database
      - POSTGRES_PASSWORD=mypas
      - POSTGRESS_DB_USER=${POSTGRESS_DB_USER}
      - POSTGRESS_DB_PASSWORD=${POSTGRESS_DB_PASSWORD}
    ports:
      - ${POSTGRESS_DB_HOST_PORT}:5432
    volumes:
      - ./postgres:/var/lib/postgresql/data
    restart: always

main.py

from fastapi import FastAPI
import uvicorn
app = FastAPI()


@app.get("/")
def get_home():
    return {"message": "Hello World"}


if __name__ == "__main__":
    uvicorn.run(app, host="0.0.0.0", port=8000)