CODEWITHSUNDEEP
rubydockerrubygemsdocker-composeamazon-sqs
dnatoli
dnatoli

Reputation: 7012

How to get IP address of container in docker-compse

I am trying to run the fake_sqs gem in a docker container in development to test my SQS integration, and have another app send messages to it.

My docker-compose file looks like this:

app:
  build: .
  command: bundle exec rails s Puma --port 3000 --binding 0.0.0.0
  volumes:
    - ./:/app
  ports:
     - 3000:3000
  links:
    - db:db
  environment:
    VIRTUAL_HOST: app.docker
    PGHOST: db
    PGUSER: postgres
    AWS_REGION: us-west-2
    AWS_QUEUE_NAME: my-queue
    AWS_ENDPOINT: http://aws.docker:4568/
fakesqs:
  build: .
  command: fake_sqs -p 4568
  volumes:
    - ./:/app
  ports:
     - 4568:4568
  links:
    - db:db
  environment:
    VIRTUAL_HOST: aws.docker
    PGHOST: db
    PGUSER: postgres
    AWS_REGION: us-west-2
db:
  image: postgres

This works to some degree. I can send messages to the fakesqs using the http://aws.docker:4568 url. The problem I am trying to solve centers around the command for the fakesqs container. If you run fake_sqs as it is written in my file, by default it sets the hostname to 0.0.0.0. This means that when I use the aws-sdk gem to request queue urls, fake_sqs replies with the wrong host.

client = Aws::SQS::Client.new
client.get_queue_url(queue_name: 'my-queue').queue_url
# => http://0.0.0.0:4568/my-queue

I obviously can't use this url to send messages. Instead, the url needs to be the IP of the fakesqs container. You can set the host url with the -o option (i.e. fake_sqs -o <IP_ADDRESS> -p 4568).

How can I access the fakesqs container IP address to put into the command? Do I have to set a static IP address for that container? Or is there another way I'm meant to be doing it?

Upvotes: 0

Views: 680

Answers (1)

Bukharov Sergey
Bukharov Sergey

Reputation: 10185

Try to use hostname instead of IP address.

add link to fake_sqs from you app container

app:
  build: .
  command: bundle exec rails s Puma --port 3000 --binding 0.0.0.0
  volumes:
    - ./:/app
  ports:
     - 3000:3000
  links:
    - db:db
    - fake_sqs #add this line!
  environment:
    VIRTUAL_HOST: app.docker
    PGHOST: db
    PGUSER: postgres
    AWS_REGION: us-west-2
    AWS_QUEUE_NAME: my-queue

and try to execute fake_sqs -o fake_sqs -p 4568 inside your app container

Upvotes: 4

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