Docker Ruby Application Example

In the following example, we are creating a ruby script file which run by using Docker. It consists of the following steps:

1. Create a directory to organize application files
$ mkdir ruby-docker-app

2. Change Directory
$ cd ruby-docker-app

3. Create a Dockerfile

Dockerfile is used to contain instructions for the docker.

// Dockerfile

FROM ruby:2 COPY . /var/www/ruby WORKDIR /var/www/ruby CMD ["ruby","index.rb"]
4. Create a ruby file

// index.rb

puts "Hello from ruby!";
5. Create Docker Image
$ docker build -t ruby-app .

6. Run the Docker Image
$ docker run ruby-app


In the above image, we can see that ruby script has been executed and prints the output on the console.