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NOTE: This repo contains only the documentation for the private BoltsOps Pro repo code. Original file: The docs are publish so they are available for interested customers. For access to the source code, you must be a paying BoltOps Pro subscriber. If are interested, you can contact us at or

Demo Frontend App

Watch the video

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The demo frontend app is useful for demonstration purposes. The frontend app calls the backend demo app and echos back the response. This is a Sinatra Ruby app.


To install the dependencies.

git clone
cd demo-frontend

Start Server Locally

Start app with bin/web. Example:

$ bin/web
== Sinatra (v2.0.5) has taken the stage on 8081 for development with backup from Puma
Puma starting in single mode...
* Version 3.12.0 (ruby 2.5.3-p105), codename: Llamas in Pajamas
* Min threads: 0, max threads: 16
* Environment: development
* Listening on tcp://
Use Ctrl-C to stop

The frontend app runs on port 8081. The frontend app simply makes a network call to the backend app and echos back the response.

Make sure you have the backend app running. Here's the backend-app README

Test with curl:

$ curl localhost:8081
frontend calling backend. response from backend: 42

Create ECR Repos

Let's get ready to deploy to ECS. We'll use AWS_PROFILE to switch between accounts. More info: Settings Setup.

First, create the ECR repos on both AWS acccounts.

AWS_PROFILE=dev aws ecr create-repository --repository-name demo/frontend
AWS_PROFILE=prd aws ecr create-repository --repository-name demo/frontend

If you need to list the repo again:

AWS_PROFILE=dev aws ecr describe-repositories
AWS_PROFILE=prd aws ecr describe-repositories

If you are using a Single AWS Account, use the commands: One Account: Create ECR Repos.

ECS Deployment

Let's deploy the demo app to an ECS cluster. We'll use the ufo tool for deployment. The project has already been set up with starter .ufo files for you. We'll just need to adjust some of the .ufo settings.

Adjust ECR Repos

Adjust the .ufo/settings.yml file, which looks like this:

  aws_profile: dev

  aws_profile: prd

Adjust the .ufo/settings.yml file to use the ECR repos that were created in the previous step.

If you are using a Single AWS Account, follow the instructions in: One Account: Adjust ECR Repos.

Adjust Network Settings

Next, adjust the network settings that the ECS service will use.

Since the frontend app is meant to be an external application, the ecs tasks will run on the PrivateAppSubnets and the ELB will run on the PublicSubnets. Adjust the .ufo network related files:

Here's what the network/development.yml settings file looks like:

vpc: vpc-111
ecs_subnets: # required: at least 2 subnets
  - subnet-111,subnet-222,subnet-333 # use PrivateApp Subnets
elb_subnets: # defaults to same subnets as ecs_subnets when not set
  - subnet-111,subnet-222,subnet-333 # use Public Subnets

We can grab the values from the CloudFormation Console Outputs tab of the VPC. Here's an example of the development VPC.

Repeat the process for the network/production.yml file.

Adjust ECS Environment Variables

The frontend knows how to connect to the backend endpoint via an environment variable. The environment variable can be configured in the .ufo/variables files.

Here's the variables/development.rb example.

@environment = helper.env_vars(%Q[

It is already preconfigured with the example endpoint we used in the demo-backend. The setting works if you have configured the route53 DNS. If you have not configured an pretty DNS name, you can also use the ELB DNS name. The DNS name is available on the ufo managed CloudFormation stack Outputs.

Deploy with ufo ship

Then you're ready to deploy with the ufo ship command. For convenience, we'll provide example commands for development and production environments. Use the commands for the environment you're working on.

UFO_ENV=development ufo ship demo-frontend-web --no-wait
UFO_ENV=production  ufo ship demo-frontend-web --no-wait

Check the CloudFormation and ECS console for the deployment to complete. It usually take about 5 to 6 minutes. After deployment completes you can grab the DNS endpoint from the ufo managed CloudFormation stack Outputs. Here's an screenshot example of development:

You can also use the ufo ps to get the external ELB DNS endpoint. Examples:

$ UFO_ENV=development ufo ps demo-frontend-web
$ UFO_ENV=production  ufo ps demo-frontend-web

Test Deployed Frontend

Since we created an external public-facing ELB, we can test the application from anywhere. Here's an example checking the both environments.

$ curl
frontend calling backend. response from backend: 42
$ curl
frontend calling backend. response from backend: 42

Repeat the process for the production account.

Go Back to Reference Architecture

That's it. Go back to the main boltopspro/reference-architecture


Public documentation for boltopspro/demo-frontend








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