title: Docker Compose - container receiving connection refused
body: <p>Using docker-compose, I'm trying to run my API on a publicly available port 8080 and an sqs service on a privately available port 9324. The API needs to be able to communicate with the sqs service. In order to do so, I have set up the following docker-compose.yml:</p>
  
  <pre><code>version: '2'
  services:
    api:
      image: api
      ports:
        - "8080:8080"
    sqs:
      image: pakohan/elasticmq
  </code></pre>
  
  <p>I have tried several iterations, including adding a link alias for the api:</p>
  
  <pre><code>links:
    - "sqs:localhost"
  </code></pre>
  
  <p>and exposing the port for sqs:</p>
  
  <pre><code>ports:
    - "9324:9324"
  </code></pre>
  
  <p>but neither seems to work. The API always gets a connection refused error when trying to communicate with the sqs service. </p>
  
  <p>When the sqs port is publicly exposed an API running outside of docker is able to communicate just fine (so the sqs service is getting initialized properly).</p>
  
  <p>Does anyone have any ideas as to how to solve this problem?</p>