Workshop - Hands On - Understanding Containers

Example of how to run containers from scratch, using a simple app implemented by Kris Urbas in react.js and redux.js

• Designed by Daniel Penagos

• Forked By Manuel Alejandro Vargas

for the original demo of the app click here

getting started

Install all the requirements on the server.

1. Install Docker

sudo apt-get install     apt-transport-https ca-certificates     curl software-properties-common

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

sudo add-apt-repository    "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
    $(lsb_release -cs) \
    stable"

sudo apt-get install docker-ce


docker --version

The user is now able to run some commands, but not all of them. To enable add the user into the docker group

sudo usermod -a -G docker <user>

sudo newgrp docker

Restart the session. DPENAGBO TODO: Add the command to restart the session without closing the session.

Now you should be able to run this command:

docker ps

3. Install the app framework

Run this just to understand how the application works on virtual machine -without docker-. This is intented to understand from the developer's perspective how to develop and run the app.

curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.34.0/install.sh | bash

source ~/.bashrc

nvm install 11

4. Clone the repo and run the app

You will find the app developed by Kris Urbas, the Dockerfile and the docker-compose.yaml designed for this hands-on.

git clone https://github.com/malevarro/reactjs-shopping-cart.git

cd reactjs-shopping-cart

npm install

npm start

In a browser open the app running in your machine on port 3000

5. Let's build an image of the app

Run this command to look the images already downloaded/installed on the virtual machine

docker image ls

Now it's time to build our own docker image. You should be located where the Dockerfile is.

docker build -t Malevarro/kart .

Check the existing images on the virtual machine

docker image ls

6. Run the container with the app

docker run -d --name kart -p 3000:3000 Malevarro/kart

docker ps

To kill the container:

docker kill kart

7. Example of docker-compose

Another example of how to run containers in a declarative way is by using Docker-compose.

Please check the docker-compose.yaml file. You will find the description of a Jenkins CI Server. Run the following command:

docker-compose up -d

docker ps

---

author of the kart app: Kris Urbas @krzysu licence: MIT