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docker-software-delivery

Demonstration of developing, testing, and delivering production software with Docker.

Overview

The MEAN stack application code in src/ is used to demonstrate how to:

  • Containerize a multi-tier application
  • Create development and test environments with Docker Compose
  • Create production environments using Docker Compose override files
  • Release a new feature from development, through test, and into production

Getting Started

An Azure Resource Manager template is provided in infrastructure/ to create an environment with three virtual machines in a virtual network with Docker installed on each. Certificates are shared and setup for TLS secured communication between the three Docker hosts. The created environment resembles the following: Azure environment You can also directly visualize the template resources:

A Resource Manager policy to allow only the creation of the required resources is also included in infrastructure/.

One-Click Deploy

Using PowerShell

The following command sequence can prepare the environment in the West US 2 Azure region:

Login-AzureRmAccount
New-AzureRmResourceGroup -Name docker -Location westus2
New-AzureRmResourceGroupDeployment -ResourceGroupName docker -TemplateFile .\infrastructure\arm-template.json -Name dsd

When finished, the following can tear down the environment:

Remove-AzureRmResourceGroup -Name docker

Useful Commands

Registry VM

To create a registry on the registry vm enter:

docker run -d --name registry \
           --restart=always \
           -v /etc/docker/:/certs \
           -e REGISTRY_HTTP_TLS_CERTIFICATE=/certs/cert.pem \
           -e REGISTRY_HTTP_TLS_KEY=/certs/key.pem \
           -p 5000:5000 \
           registry:2

The registry is accessible from with the virtual network at registry.ca-labs.com:5000

Development VM

After cloning the source code, unit test the code

npm install
npm test

Build the image:

docker build -t registry.ca-labs.com:5000/accumulator:1 registry.ca-labs.com:5000/accumulator:1.0 .

Push the image to the registry:

docker push registry.ca-labs.com:5000/accumulator:1
docker push registry.ca-labs.com:5000/accumulator:1.0

Integration test the applicaiton using Docker Compose:

docker-compose up -d
bash integration.sh
docker-compose down

Simplify communication with the production VM by moving certificates to the user's default .docker directory:

mkdir ~/.docker
sudo cp /etc/docker/ca.pem \
        /etc/docker/cert.pem \
        /etc/docker/key.pem \
        ~/.docker
sudo chown student ~/.docker/*

Start the application on the production VM using Docker Compose the production override file:

DOCKER_HOST=production.ca-labs.com:2376 DOCKER_TLS_VERIFY=true docker-compose \
    -f docker-compose.yml \
    -f docker-compose.prod.yml \
    up \
    -d

Update the application with v1.1 of the source code which includes a new feature:

cp -R src/commits/v1_1/. src

Build the v1.1 container image:

docker build -t registry.ca-labs.com:5000/accumulator:1 registry.ca-labs.com:5000/accumulator:1.1 .

Push the new image to the registry:

docker push registry.ca-labs.com:5000/accumulator:1
docker push registry.ca-labs.com:5000/accumulator:1.1

Pull the new version of the image onto the production VM:

DOCKER_HOST=production.ca-labs.com:2376 DOCKER_TLS_VERIFY=true docker-compose pull

Update only the app service to deploy the new feature and keep the database up:

DOCKER_HOST=production.ca-labs.com:2376 DOCKER_TLS_VERIFY=true docker-compose \
    -f docker-compose.yml \
    -f docker-compose.prod.yml \
    up \
    -d \
    --no-deps \
    app