Unable to connect to "db" #1339

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1. llcool commented on Mar 27, 2026

   

   llcool

   on Mar 27, 2026

   Author

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   This fixes the issue with Unable to connect to "db"
   Both containers must run on the same shared network.

   services:
     api:
       image: idealpostcodes/postcodes.io:latest
       restart: unless-stopped
       build:
         context: .
         dockerfile: ./Dockerfile
       depends_on:
         - db
       environment:
         - POSTGRES_DATABASE=postcodesiodb
         - POSTGRES_PASSWORD=secret
         - POSTGRES_USER=postcodesio
         - POSTGRES_HOST=db
       networks:
         - postcodes_io
       ports:
         - 8000:8000
     db:
       image: idealpostcodes/postcodes.io.db:latest
       restart: unless-stopped
       environment:
         - POSTGRES_DB=postcodesiodb
         - POSTGRES_PASSWORD=secret
         - POSTGRES_USER=postcodesio
       networks:
         - postcodes_io
   networks:
     postcodes_io:
       name: postcodes_io
   
   
2. cblanc commented on May 28, 2026

   

   cblanc

   on May 28, 2026

   Member

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   Hi @llcool - we've just released a major update - does this problem persist?
3. llcool commented on May 28, 2026

   

   llcool

   on May 28, 2026

   Last edited by llcool

   Author

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   Hi @llcool - we've just released a major update - does this problem persist?

   Yes, still a problem.

   2026/05/28 12:08PM 50 pid=1 hostname=12cb318211b4 name=postcodes.io error=getaddrinfo ENOTFOUND db
   

   You should add networks

   --- /home/lloyd/Downloads/docker-compose.yml
   +++ /home/lloyd/Downloads/docker-compose-fix.yml
   @@ -12,6 +12,8 @@
          - POSTGRES_PASSWORD=secret
          - POSTGRES_USER=postcodesio
          - POSTGRES_HOST=db
   +    networks:
   +      - postcodes_io
        ports:
          - 8000:8000
      db:
   @@ -21,3 +23,8 @@
          - POSTGRES_DB=postcodesiodb
          - POSTGRES_PASSWORD=secret
          - POSTGRES_USER=postcodesio
   +    networks:
   +      - postcodes_io
   +networks:
   +  postcodes_io:
   +    name: postcodes_io
   
   

   docker-compose.patch