This document discusses Docker containers on Windows. It begins by explaining the difference between virtual machines and containers, and the options for container runtimes on Windows like Nano Server and Windows Server Core. It then provides an example of a simple Dockerfile and discusses strategies for reducing image sizes like using a multi-stage Dockerfile. The document also covers using Docker with Visual Studio 2017 and SQL Server, and concludes with contact information for the author.

1. DockerContainers
onWindows

2. DockerContainers
onWindows
Maurice de Beijer - @mauricedb

3. Topics
 What is a Container and Docker?
 Docker onWindows
 Docker andVS2017
 Docker and SQL Server
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4.  Maurice de Beijer
 The Problem Solver
 MicrosoftAzure MVP
 Freelance developer/instructor
 Twitter: @mauricedb
 Web: http://www.TheProblemSolver.nl
 E-mail: maurice.de.beijer@gmail.com
4

5. Containers

7. Virtual Machine
vs
Container

8. Linux

9. Windows

10. Nano server
vs
Windows
ServerCore
 OnWindows Docker containers can either run Nano Server or
Windows Server Core
 The microsoft/nanoserver
 The image is 1.08GB
 microsoft/windowsservercore
 The image is 10.3GB 

11. Container
runtimes
Windows Server Containers
docker run --isolation=process
 Uses a shared kernel
 Process & namespace
isolation
 Trusted code only
 Windows Server 2016 only
Hyper-V Isolation
docker run --isolation=hyperv
 Kernel is not shared.
 Optimized virtual machine
 Execute untrusted code
 Windows 10 or server 2016

12. Simple
Dockerfile
FROM microsoft/aspnetcore-build:2.0
WORKDIR /app
EXPOSE 80
COPY MyWebApp .
ENTRYPOINT ["dotnet", "run", "--no-launch-profile"]

13. The problem
 Using source code in production
 4.64MB the initial application
 Optionally:
 RUN dotnet build
 ENTRYPOINT ["dotnet", " MyWebApp.dll"]
 Large image with complete SDK and NuGet packages
 2.75GB on Windows
 1.86GB on Linux
 Based on 100MB Debian

14. The solution
 Only release binaries in container image
 Just 2.72MB for the initial application 
 Much smaller image
 1.25GB onWindows
 283MB on Linux
 Based on 100MB Debian
 Alpine Linux is just 3.97MB 

15. Multi stage
Dockerfile
(Builder)
# Build and publish source code in image "builder"
FROM microsoft/aspnetcore-build:2.0 AS builder
WORKDIR /src
COPY *.sln ./
COPY MyWebApp/MyWebApp.csproj MyWebApp/
RUN dotnet restore
COPY . .
WORKDIR /src/MyWebApp
RUN dotnet build -c Release -o /app
RUN dotnet publish -c Release -o /app

16. Multi stage
Dockerfile
(Runtime)
# Build actual runtime container image
FROM microsoft/aspnetcore:2.0
WORKDIR /app
EXPOSE 80
WORKDIR /app
COPY --from=builder /app .
ENTRYPOINT ["dotnet", " MyWebApp.dll"]

17. VisualStudio
2017

18. Docker
Compose
 A tool for defining and running multi-container Docker
applications.
 Used byVisual Studio 2017

19. Docker
Compose
version: '3'
services:
dockerdemo:
image: dockerdemo
build:
context: ./DockerDemo
dockerfile: Dockerfile

21. SQLServer 2016
on Docker
 Both onWindows and Linux 
 TheWindows image is 13GB 
 Based on Windows Server Core
 Linux image is 1.4GB
 Base on Ubuntu 16

22. Building a test
database
# Build a test data image
FROM microsoft/mssql-server-windows
COPY . .
RUN sqlcmd -i CreateAndPopulateDatabase.sql
SHELL ["powershell", "-Command",
"$ErrorActionPreference = 'Stop’;
$ProgressPreference = 'SilentlyContinue';"]
CMD .start -sa_password Password1
-ACCEPT_EULA Y -Verbose

23. Docker
Compose
version: '3'
services:
dockerdemo:
image: dockerdemo
build:
context: ./DockerDemo
dockerfile: Dockerfile
depends_on:
- demodata
demodata:
image: "demodata:10"

24. Service name
is host name
protected override void OnConfiguring(
DbContextOptionsBuilder optionsBuilder)
{
optionsBuilder.UseSqlServer(
"Server=DemoData;Database=DemoDB;user=sa;password=Password1;");
}

25. Conclusion
© ABL - The Problem Solver 25

26. Maurice de Beijer
@mauricedb
maurice.de.beijer
@gmail.com
© ABL - The Problem Solver 26