Docker Intro Session Exercise #2

docker-intro-session-ex-2.ps1

# In this exercise we are going to automate Docker provisioning
# by using Dockerfiles.
#
# After completing this lab, you are expected to know how to:
#
# a. Understand what is a Dockerfile
# b. Build a Docker image from a Dockerfile
# c. Deploy applications inside a container
# d. Name and Tag images for later use
#
# Docker Intro Session Lab - James Attard (2019)

# Before we start, make sure that you still have the Powershell Nanoserver image created in the previous exercise.
docker run mcr.microsoft.com/powershell:6.2.1-nanoserver-1803

# Create a new directory where we place our powershell script and Dockerfile
mkdir windows-ps-demo
cd windows-ps-demo

# Place the attached Powershell script and Dockerfile inside the windows-ps-demo directory
cp HelloWorld.ps1 Dockerfile .

# To truly understand the potential of Dockerfiles, let's first deploy the application manually
# Create container and run Powershell script
docker create -t --name HelloNanoServerWorld -h NanoServer -i mcr.microsoft.com/powershell:6.2.1-nanoserver-1803
docker cp -a HelloWorld.ps1 HelloNanoServerWorld:HelloWorld.ps1
docker start HelloNanoServerWorld
docker exec HelloNanoServerWorld pwsh HelloWorld.ps1

# Now let's do the same thing with a Dockerfile
docker build -t hellonanoserverworld2 .
docker run --name mynanocontainer hellonanoserverworld2

Dockerfile

FROM mcr.microsoft.com/powershell:6.2.1-nanoserver-1803

COPY HelloWorld.ps1 /

CMD ["pwsh", "HelloWorld.ps1"]

HelloWorld.ps1

# Create a PowerShell Script for NanoServer 
# Container Name HelloNanoServerWorld 
# Demonstrated by James Attard
# June 2019

Write-Host ("Microsoft NanoServer Container") -ForegroundColor Green
Write-Host ("Operating System: $([Environment]::OSVersion.VersionString)") -ForegroundColor Red
Write-Host ("Hostname: $env:COMPUTERNAME") -ForegroundColor Magenta
Write-Host ("Username: $([Environment]::UserName) ") -ForegroundColor Yellow