ecs-rails

If you are hosting your Rails app on ECS Fargate and want to connect to the Rails console or launch a bash session, you need to use AWS cli like so :

aws ecs execute-command --region eu-west-3 --cluster CLUSTER_ARN --task TASK_ARN --container CONTAINER_NAME --command 'bundle exec rails console' --interactive

This gem helps to get the correct cluster arn and task id so that you don't have to get them yourself.

ecs console
ecs bash

Installation

Install AWS cli

Install AWS Session Manager plugin

Install gem

gem install 'ecs-rails'

Configuration

Plain Ruby

Via environment variables:

export ENV['AWS_REGION'] = 'us-east-1'
export ENV['AWS_ACCESS_KEY_ID'] = 'your-access-key-id'
export ENV['AWS_SECRET_ACCESS_KEY'] = 'your-secret-access-key'
export ENV['CONTAINER_NAME'] = 'your-container-name'

Rails

# config/initializers/ecs-rails.rb
EcsRails.aws_region = 'us-east-1'
EcsRails.aws_access_key_id = ENV['AWS_ACCESS_KEY_ID']
EcsRails.aws_secret_access_key = ENV['AWS_SECRET_ACCESS_KEY']
EcsRails.container_name = 'webapp'

Usage

Connect to Rails console on a running Task.

ecs console

Select a cluster:
1) cluster-prod
2) cluster-staging
Choose 1-2 [1]:

Select a service:
1) app
2) worker
Choose 1-2 [1]:

irb(main)>

You can specify cluster name via -c option by giving a string included in cluster arn. You can specify service name via -s option by giving a string included in service arn.

# with cluster name: webapp-cluster-prod-e950a13
# with service name: webapp-app-prod-7c7cad7
ecs console -c prod -s app
irb(main)>