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Database initialization happens later than start of other services in docker-compose – Nginx

When I first time build containers database doesn’t have enough time to initialize itself while web service and nginx is already up and thus I can’t reach the server from a first run, but after second containers run everything works properly. I have tried this command: ["./wait-for-it.sh", "db:5432", "--", "python", "manage.py runserver 0.0.0.0:8000"] to wait until database got initialized, but it didn’t help me. Help me please to make my services wait until database get initialized. I’ve tried solutions from this post, but nothing was helpful. Help me please to make my services wait until database get initialized. Thanks in advance!

Here is my docker-compose file

version: "3.9"

services:
  db:
    image: postgres:13.3-alpine
    container_name: db
    volumes:
      - ./data/db:/var/lib/postgresql/data
    environment:
      - POSTGRES_DB=postgres
      - POSTGRES_USER=postgres
      - POSTGRES_PASSWORD=postgres
    ports:
      - "5432:5432"
    healthcheck:
      test: [ "CMD", "curl", "-f", "http://localhost:5432" ]
      interval: 30s
      timeout: 10s
      retries: 5
  web:
    build: .
    container_name: web
    command: python manage.py runserver 0.0.0.0:8000
    volumes:
      - .:/code
    ports:
      - "8000:8000"
    restart: on-failure
    depends_on:
      - db
  nginx:
    build: ./nginx
    container_name: nginx
    ports:
      - "80:80"
    restart: on-failure
    depends_on:
      - web
      - db
Tags:

2

Answers


  1. Chosen as BEST ANSWER
    0

    Problem solved by adding the short line of script to command.

      web:
    build: .
    container_name: web
    command: bash -c 'while !</dev/tcp/db/5432; do sleep 1; done; python manage.py runserver 0.0.0.0:8000'
    volumes:
      - .:/code
    ports:
      - "8000:8000"
    restart: on-failure
    depends_on:
      - db

  2. 0

    depends_on only waits until the service has started, not until it is healthy. You should try to additionally define the condition service_healthy to wait until a dependency is healthy:

    depends_on:
  db:
     condition: service_healthy

    Here’s a complete docker-compose file for reference:

    version: "3.9"

services:
  db:
    image: postgres:13.3-alpine
    container_name: db
    volumes:
      - ./data/db:/var/lib/postgresql/data
    environment:
      - POSTGRES_DB=postgres
      - POSTGRES_USER=postgres
      - POSTGRES_PASSWORD=postgres
    ports:
      - "5432:5432"
    healthcheck:
      test: ["CMD-SHELL", "pg_isready -U postgres"]
      interval: 1s
      timeout: 5s
      retries: 5
  web:
    image: nginx:latest
    container_name: web
    restart: on-failure
    depends_on:
      db:
        condition: service_healthy
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