Docker Basic connection to local dynamodb configuration

Question

I am using a symfony app and connecting to a local dynamodb instance in a docker container.

I keep getting AWS HTTP error: cURL error 7: Failed to connect to db port 8889: Connection refused error.

My docker-compose file is simply:

version: '3'
services:
  web:
    depends_on:
        - db
    build: .
    ports:
        - "8000:8000"
  db:
    image: "amazon/dynamodb-local"
    ports:
        - "8889:8889"

Honestly, I always get confused by the port mapping, but I don't think that should matter here. I'm trying to connect to http://db:8889. To make things simpler, I executed the following inside my web container:

# curl http://db:8889
curl: (7) Failed to connect to db port 8889: Connection refused

I'm kinda stumped, and I think this is such a simple thing most of the docs skim right over it. (or maybe I do)

Can you try omitting the http:// part in the connection url? — dvnguyen
– dvnguyen, Commented Aug 29, 2018 at 21:18

David Maze · Accepted Answer · 2018-08-30 01:13:21Z

1

The image documentation suggests the DynamoDB server runs on port 8000, so you should access it as http://db:8000. You don't have to publish it on port 8000 or on any port at all, but you need to use the container-side port number to reach it from other containers.

answered Aug 30, 2018 at 1:13

David Maze

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