Todo Task

Introduction

This Node.JS example runs multiple workers to handle REST requests. When started the service starts as many workers as processor cores are present on the host machine.

API description

The interface is accessible on following url.

GET http://localhost:8081/api/v1

The returned response is in JSON format as:

{
   "ua":    "<user-agent>",
   "ip":    "<client-ip>",
   "uuid":  "<worker-uuid>"
}

Run as Node.JS process

To run application download the repository content and run bellow commands in destination directory.

npm install
npm start

Run as Docker application

To build the image run the bellow command. The -t flag lets tag the image so it's easier to find later using the docker images command:

$ docker build -t <your username>/todo-task .

Running the image with -d runs the container in detached mode, leaving the container running in the background. The -p flag redirects a public port to a private port inside the container. To run the image previously built run following command:

$ docker run -e "NODE_ENV=production" -u "node" -m "300M" --memory-swap "1G" -p 49160:8081 -d <your username>/todo-task

To print the output of the app:

# Get container ID
$ docker ps

# Print app output
$ docker logs <container id>

Test

In the example above, Docker mapped the 8081 port inside of the container to the port 49160 on host machine. The app can be called using curl

$ curl -i http://localhost:49160/api/v1/