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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

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

2. Install Docker-Compose

sudo curl -L "https://github.com/docker/compose/releases/download/1.22.0/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose

sudo chmod +x /usr/local/bin/docker-compose

docker-compose --version

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/danielpenagos/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 banrep/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 banrep/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