Connection between two secondary containers

Build Environment
1

I have a primary container A, and two secondary containers B1 and B2, and both A and B1 need to connect to B2. Is there a way to make this work without using docker compose?

I’ve been trying to connect to localhost:5432 from B1, but that results in this error:

Could not connect to server: Connection refused\n\tIs the server running on host "localhost" (127.0.0.1) and accepting\n\tTCP/IP connections on port 5432?

Any ideas?

2

This should work out of the box, can you share your entire CircleCI configuration?

3

This is my current configuration. I’ve checked the postgres instance, and it is ready to accept connections long before hasura attempts to connect, but hasura still fails connect.

version: 2
aliases:
  - &TEST_RESULTS ./test-results/

jobs:
  test:
    environment:
      TEST_RESULTS: *TEST_RESULTS

    docker:
      - image: circleci/python:3.7.5
      - image: circleci/postgres:9.6-alpine-ram
        environment:
          POSTGRES_USER: db_master_user
          POSTGRES_DB: db_test
          POSTGRES_PASSWORD: db_password
      - image: hasura/graphql-engine:latest
        name: hasura
        #        command: ["graphql-engine", "serve"]
        command: ["sh", "-c", "sleep 30 && graphql-engine serve"]
        environment:
          HASURA_GRAPHQL_DATABASE_URL: postgres://db_master_user:db_password@localhost/db_test

    steps:
      - checkout

      - restore_cache:
          key: v1-dependencies-{{ checksum "poetry.lock" }}

      - run:
          name: 'Wait for Hasura'
          command: dockerize -wait tcp://localhost:8080 -timeout 1m
4

Is there anything in the postgres container logs that could point to the issue?

5

I was able to get this working by specifying an explicit name for the postgres instance, instead of relying on the default, implicit localhost name. After naming it postgres, I was able to connect the hasura instance.

6

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