Presented at NDC London, 4th December 2014

1. Architecting .NET Applications for
Docker and Container Based
Deployments
@Ben_Hall
Ben@BenHall.me.uk
Blog.BenHall.me.uk

2. Who?
@Ben_Hall
Tech Support > Tester > Developer > Founder >
Freelancer
Ocelot Uproar

3. Agenda
• What are containers?
• .NET running inside a Docker Container
• Two Containers
• Three Containers
• Four Containers, More!
• Future of Docker and Windows/.NET

4. A Load Balanced ASP.NET Website
running inside Docker

5. WHAT ARE CONTAINERS?

6. Deployments are hard.
They shouldn’t be.

7. Container
https://www.docker.com/whatisdocker/

8. Container…
Own Process Space
Own Network Interface
Own Root Directories
Sandboxed
Like a lightweight VM. But it’s not a VM.

9. Container…
Native CPU
Native Memory
Native IO
No Pre-Allocation
Zero Performance Overheard

12. Build, Ship and Run Any App, Anywhere
Docker - An open platform for distributed applications
for developers and sysadmins.

14. In Real Life?
Digital Ocean Ubuntu Droplet
Node.js Node.js GoLang Mono
Static Site ElasticSearch ElasticSearch
Logstash Kibana Nginx Redis

15. - Easy deployment
- Isolated sandboxes
- Portability
- Development === Production
- Control

17. $ boot2docker
https://github.com/boot2docker/windows-installer

18. Production

20. Not much .NET on there…
At the moment they’re based on Linux.
Today Mono works, as does XSP and
ASP.NET vNext.
Tomorrow?

24. .NET APPLICATION RUNNING
INSIDE CONTAINER

25. $ docker run
Usage: docker run [OPTIONS] IMAGE [COMMAND] [ARG...]

26. $ docker run
--name === Friendly name
--rm === Remove when finished
-t === Attach to terminal
-I === Interactive

27. ASP.NET Example

28. http://blog.benhall.me.uk/2014/10/running-nancyfx-inside-docker-container/

29. Dockerfile

30. Dockerfile - FROM

34. $ docker search

35. Dockerfile – ADD / WORKDIR /
RUN

36. Dockerfile - EXPOSE

37. Dockerfile – CMD /
ENTRYPOINT

39. $ docker build
--t === Friendly name.
<Docker Hub Username>/<ProjectName>

40. $ docker images

43. $ docker run

44. $ docker ps
-a === Show all containers

45. $ docker logs
-f === tail the logs – watch them in real time

46. $ docker run –p $CONTAINERPORT

47. Why “$ curl 0.0.0.0:49218” ?

48. $ boot2docker ip

49. $ curl b2d:49218

51. Environment Variables

52. $ docker push

55. $ docker export / save

56. $ docker import / load

57. What do we have?
$ cd ~/SourceControl/HelloWorldVNext
$ cat Dockerfile
$ docker build -t benhall/aspnetvnext .
$ docker run -d -t -i -p 5000:5000 benhall/aspnetvnext
$ curl 192.168.59.103:5000
<h1>Hello from Razor!!<h1>
<h2>From 95a28c090686</h2>
$ docker push benhall/aspnetvnext

58. TWO CONTAINERS

59. Storing Data - Volumes
-v /opt/docker/scrapbook_elasticsearch:/data
-v /opt/docker/mysql:/var/lib/mysql
-v /docker/scrapbook/uploads:/app/public/uploads

61. $ docker run –link CONTAINER:ALIAS

63. Two Websites On Port 80?

64. Nginx

68. DockerGen
Generate files from docker container meta-data
https://github.com/jwilder/docker-gen

72. https://github.com/jwilder/nginx-proxy

73. THREE CONTAINERS

74. Fig

76. $ fig up

77. Identical for Mono/ASP.NET

78. FOUR AND MORE!

80. http://www.ryantomlinson.com/consul-service-discovery-in-a-microservice-world/

81. 1) Like DockerGen, Consul
raises events on docker
events
2) Registrator adds new
containers details into Consul
3) Consul links containers IP /
Ports to DNS names

82. $ ping redis.service.east-aws.consul
$ ping redis.service.consul
[tag.]<service>.service[.datacenter][.domain]

84. https://github.com/BenHall/docker-loadbalancer-aspnet-demo

85. BRING IT BACK TO .NET

86. How should the app be
structure?

87. DOCKER AND AZURE

88. $ azure vm docker create -e 22 -l 'West US' ubuntu-docker
"b39f27a8b8c64d52b05eac6a62ebad85__Ubuntu-14_04-LTS-amd64-
server-20140618.1-en-us-30GB" rgardler 1234abcdE$
http://msopentech.com/blog/2014/09/11/docker_host_in_azure/

89. $ docker --tls
-H tcp://ubuntu-docker.cloudapp.net:4243
info
http://msopentech.com/blog/2014/08/15/getting_started_docker_on_microsoft_azure/

90. $ docker --tls
-H tcp://ubuntu-docker.cloudapp.net:4243
run -t -i ubuntu bash
http://msopentech.com/blog/2014/08/15/getting_started_docker_on_microsoft_azure/

92. THE FUTURE?

93. Docker and Microsoft
Partnership

94. SQL Server as a Container?

96. Visual Studio as a Container?

98. IN SUMMARY…

99. Only tool I use for deployment
• Close gap between development and
production
• Everything is a container!
• Running platforms like Logstash,
ElasticSearch, Redis, EventStore,
RavenDB, NancyFX etc? Consider
containers for deployment.

101. THANK YOU
@Ben_Hall
Ben@BenHall.me.uk
Blog.BenHall.me.uk