SpringOne Platform 2017 Dave Tillman, Pivotal; Zach Brown, Pivotal; Beth Massi, Microsoft "When .NET went open source in 2014, the .NET ecosystem was propelled into a new era. The cultural shift at Microsoft toward open source and cross-platform standards (like .NET Core) has since brought about a renaissance in .NET, with a growing community of projects and tools to help developers along their cloud-native journey. The Steeltoe OSS project has sprung up within this community, driven by the needs of enterprise developers for a cloud-native framework for ASP.NET applications. By borrowing patterns from the Java/Spring world, Steeltoe brings solutions for shared configuration, service discovery, circuit breakers and more, to the .NET community. In this session, Beth Massi from Microsoft will walk us through the pivotal events that brought about the .NET renaissance, and how modern .NET supports any developer building any app for any platform. Then Zach Brown and Dave Tillman from Pivotal will take a deep dive into Steeltoe, explaining the problems the framework aims to solve, then demonstrating how to build resilient microservices with ASP.NET Core."

1. Steeltoe and the
Open Source .NET Renaissance
Dave Tillman
Lead Engineer - Steeltoe, Pivotal
Zach Brown - @moredeploys
Product Strategy & Marketing, Pivotal
Beth Massi - @BethMassi
Product Marketing Manager .NET Platform, Microsoft
1

2. Unless otherwise indicated, these slides are © 2013 -2017 Piv otal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Outline
• Welcome to the .NET Renaissance
• Steeltoe Overview
• Why is Steeltoe?
• What’s in Steeltoe?
• Demo and Deep Dive
• Roadmap & Resources
2

3. Unless otherwise indicated, these slides are © 2013 -2017 Piv otal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Be engaged!
Join the dialogue
Share your thoughts, opinions and photos
...even if you disagree
3
Beth Massi
@BethMassi
Steeltoe Project
@SteeltoeOSS
Zach Brown
@moredeploys
#springone

4. Welcome to the
.NET Renaissance

5. Happy 15th Birthday, .NET!
Born February 13, 2002

6. LIBRARIES
INFRASTRUCTURE
.NET STANDARD

7. LIBRARIES
INFRASTRUCTURE
.NET STANDARD

8. LIBRARIES
INFRASTRUCTURE
.NET STANDARD
.NET Standard allows
sharing code, binaries and
skills between .NET client,
server and all of its flavors.
.NET Standard provides a
specification for any
platform to implement

9. APIs in .NET Standard 2.0
THREADING Threads • Thread Pool • Tasks
IO Files • Compression • MMF
DATA DataSet • DataTable • SQLClient

10. APIs in .NET Standard 2.0
THREADING Threads • Thread Pool • Tasks
IO Files • Compression • MMF
DATA DataSet • DataTable • SQLClient
https://github.com/dotnet/standard

11. Unless otherwise indicated, these slides are © 2013 -2017 Piv otal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
.NET Languages Innovation
C#
- Innovate aggressively and responsibly bringing latest language trends to
enable modern applications
- C# 7.2 just released – bring features in quicker with dot releases
- C# 8.0 preview – Null reference types
F#
- Be the most productive functional language with full integration and
interoperability with .NET
Span<T> implemented
- Safe access to continuous regions of memory
- Brings performance improvements up and down the stack
https://github.com/dotnet/csharplang/

13. 0
200
400
600
800
1000
1200
Oct-13
Jan-14
Apr-14
Jul-14
Oct-14
Jan-15
Apr-15
Jul-15
Oct-15
Jan-16
Apr-16
Jul-16
Oct-16
Jan-17
Apr-17
Jul-17
Community Accepted PRs “Samsung is embracing .NET because it is a
completely open source project.” — Samsung
".NET is open source; that allows us to contribute
back to it if we have any performance issues which
Microsoft review and together we make a better
product.“ — Illyriad Games
25,000+ Community Contributions from 1700+ Companies outside Microsoft

14. Top 30
Highest
Velocity
OSS
Projects
https://www.cncf.io/blog/2017/06/05/30-highest-velocity-open-source-projects/

15. Unless otherwise indicated, these slides are © 2013 -2017 Piv otal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Performance improvements in .NET Core 2.0
Base class libraries (CoreFX)
• The community has submitted many of these performance improvements
RyuJIT – Just-in-time IL compiler
• Benefits all .NET implementations
Profile-guided optimization (PGO)
• Improvements to generate better optimized code for native components
“Using the same-size server, we were able to go from 1,000 requests per
second per node with Node.js to 20,000 requests per second with .NET Core.“
— Raygun
https://www.microsoft.com/net/customers

16. From TechEmpower Round 13 Plaintext Tests

17. Modern Relevance
Growth in popularity on Hacker
News and Reddit since going open
and cross platform
Job market
#2 demanded primary technology
(LinkedIn)
Development frameworks on Reddit &
Hacker News
Java
Node.js
.NET
Community Momentum

18. .NET is loved
.NET Core debuts at #3 most loved Framework on
Stack Overflow Technology Survey 2017
Source: http://stackoverflow.com/insights/survey/2017
C# is #3 most popular language for desktop and web
developers on Stack Overflow Technology Survey 2017

19. www.dot.net/architecture

20. RayGun
"Using the same-size server, we were able to go from 1,000 requests per second
per node with Node.js to 20,000 requests per second with .NET Core."
- John-Daniel Trask, CEO and Co-Founder
AstroReality, Quantum Technologies
"We think .NET Core is mature, very powerful, and a great choice for
advanced modern apps."
- Zerlot Ma, Cofounder and CEO
Jet.com Inc.
"The event-driven, microservices paradigm eliminated a lot of the
overhead that comes with a service-oriented architecture."
- Mike Hanrahan, CTO
Tencent
“The cross-platform capabilities of .NET Core were very important to us. Also,
Microsoft designed .NET Core with a microservice architecture in mind, and
that fits right in with our redesign plans.”
- Shanyou Zhang: Senior Software Architect
Age of Ascent, Illyriad Games
"Our game microservices are built using ASP.NET Core which gives us
superior performance. ASP.NET is open source, that allows us to
contribute back to it if we have any performance issues which Microsoft
review and together we make a better product."
- Ben Adams, CTO and Co-founder
NetEase
".NET Core doesn't just help us get to market faster, it also enables our
developers to focus on the core logic and what really matters, our players'
experience. They don't have to deal with the communication gap and different
ways of implementing the algorithm on the back and front end. They can just
work on finding better ways to implement their ideas."
- Feng Zhou, Product Director
United Parcel Service (UPS)
"Xamarin allowed us to develop a single code base in C# and deploy the
application to two completely different mobile phone ecosystems."
- Scott Hildebrand, Application Development Manager
GoDaddy
“Services can be developed more quickly, perform faster in production, and
scale better if they’re written using .NET Core with C#.”
- Jeremiah Gowdy: Principal Software Architect
microsoft.com/net/customers

21. Steeltoe
DotNetNuke
SourceLink
nUnit
MvvmCross
IronPython
ILMerge

22. Unless otherwise indicated, these slides are © 2013 -2017 Piv otal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Welcome Steeltoe to .NET Foundation!
Resilient .NET microservices
Cloud-native Security
Data Connectors
Service discovery with Netflix Eureka
Circuit breakers with Netflix Hystrix
Shared config with Spring Cloud Configuration Server
Integration with Cloud Foundry
Plus Management tools for production microservices
http://steeltoe.io/

23. Steeltoe Overview

24. Why is Steeltoe?

25. Unless otherwise indicated, these slides are © 2013 -2017 Piv otal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
- 12 Factor App principles (https://12factor.net/)
- Configuration stored in environment variables
- Out of process session state
- No r/w to registry, GAC, Local file system
- Loosely coupled backing services (i.e. RDBMS)
“Today’s best practices are tomorrow’s anti-patterns.”
Cloud-Native .NET

26. Unless otherwise indicated, these slides are © 2013 -2017 Piv otal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Benefits of Microservices Architectures
- Quickly iterate and release frequently
- Easy for new devs to join and be productive
- Increased developer velocity
- Shorter test cycles
- Polyglot becomes reality
- Independently scalable components
Microservices

27. Unless otherwise indicated, these slides are © 2013 -2017 Piv otal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Microservices = Distributed Systems = Way more complexity
- How to troubleshoot microservices?
- How to set global configuration across
the whole application?
- How to look up the dynamic addresses
of services you consume?
- What do you do when a service you
depend on stops responding?
But Microservices are hard

28. Unless otherwise indicated, these slides are © 2013 -2017 Piv otal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
There are some great OSS solutions already available
and
But until now they’ve been focused on Java
and not very accessible to .NET devs…
The good news is…

29. Unless otherwise indicated, these slides are © 2013 -2017 Piv otal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
To help you build
Cloud native .NET applications
and leverage Spring Cloud tooling for
resilient microservices
So that’s why we built Steeltoe

30. What’s in Steeltoe?

31. Unless otherwise indicated, these slides are © 2013 -2017 Piv otal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Connectors for common data services
- MySQL
- Postgres
- Redis
- RabbitMQ
- OAuth2
- MS SQL Server
Cloud-Native .NET

32. Unless otherwise indicated, these slides are © 2013 -2017 Piv otal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Security Providers
- OAuth2 SSO Provider
- JWT resource protection
- Redis-backed Key Ring Repository
Cloud-Native .NET

33. Unless otherwise indicated, these slides are © 2013 -2017 Piv otal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Management Endpoints
- /info
arbitrary app info, e.g. git build tag
- /health
application health information
- /trace
circular buffer of last 100 http requests/responses
- /loggers
shows and modifies configuration of loggers down to the class level
Cloud-Native .NET

34. Unless otherwise indicated, these slides are © 2013 -2017 Piv otal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Configuration Providers
Cloud Foundry
• VCAP_APPLICATION, VCAP_SERVICES, CF_*
Config Server
• Access config stored in Spring Cloud Config Server
(backed by Git, Vault, local filesystem)
• Across all instances, all apps, all environments
Cloud-Native .NET

35. Unless otherwise indicated, these slides are © 2013 -2017 Piv otal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Spring Cloud Config Server
Cloud-Native .NET

36. Unless otherwise indicated, these slides are © 2013 -2017 Piv otal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Service Discovery with Eureka
- .NET Client for Netflix Eureka
- Dynamically discover and call
registered services
- Supports direct addressing
Resilient Microservices

37. Unless otherwise indicated, these slides are © 2013 -2017 Piv otal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Circuit Breaker
- .NET implementation of Netflix Hystrix
- Bypass failing services with
elegant fall-back behavior
(so your users don’t see nasty error messages)
- Rich metrics and monitoring
Resilient Microservices

38. Unless otherwise indicated, these slides are © 2013 -2017 Piv otal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Netflix Hystrix
Resilient Microservices

39. Unless otherwise indicated, these slides are © 2013 -2017 Piv otal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Steeltoe works...
with .NET Core and with the .NET Framework
on Windows and on Linux
standalone and running on Cloud Foundry
Open and Flexible
…and now it’s part of the

40. Demo

41. Unless otherwise indicated, these slides are © 2013 -2017 Piv otal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
MusicUI
OrderProcessin
g
MusicStore
ShoppingCart
mySQL
redis
mySQL
mySQL
session
cache
GitHub repo: https://github.com/SteeltoeOSS/Samples/tree/master/MusicStore
ASP.NET Music Store
browse
music
add item
to cart
place
order

42. Unless otherwise indicated, these slides are © 2013 -2017 Piv otal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
MusicUI
OrderProcessin
g
MusicStore
ShoppingCart
mySQL
redis
mySQL
mySQL
session
cache
GitHub repo: https://github.com/SteeltoeOSS/Samples/tree/master/MusicStore
ASP.NET Music Store w/Steeltoe + Config
Server
config
servergit
config
config
config
config

43. Unless otherwise indicated, these slides are © 2013 -2017 Piv otal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
MusicUI
OrderProcessin
g
MusicStore
ShoppingCart
mySQL
redis
mySQL
mySQL
session
cache
GitHub repo: https://github.com/SteeltoeOSS/Samples/tree/master/MusicStore
ASP.NET Music Store w/Steeltoe + Connectors
config
servergit
redis
connector
mysql
connector
mysql
connector
mysql
connector

44. Unless otherwise indicated, these slides are © 2013 -2017 Piv otal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
MusicUI
OrderProcessin
g
MusicStore
ShoppingCart
mySQL
redis
mySQL
mySQL
session
cache
GitHub repo: https://github.com/SteeltoeOSS/Samples/tree/master/MusicStore
ASP.NET Music Store w/Steeltoe + Discovery
config
servergit
browse
music
add item
to cart
place
order
eureka
server
service
addresses
register
services

45. Unless otherwise indicated, these slides are © 2013 -2017 Piv otal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
MusicUI
OrderProcessin
g
MusicStore
ShoppingCart
mySQL
redis
mySQL
mySQL
session
cache
GitHub repo: https://github.com/SteeltoeOSS/Samples/tree/master/MusicStore
ASP.NET Music Store w/Steeltoe + Management
config
servergit
eureka
server
/info
/health
/trace
/loggers
/info
/health
/trace
/loggers
/info
/health
/trace
/loggers
apps
manager

46. Unless otherwise indicated, these slides are © 2013 -2017 Piv otal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
MusicUI
OrderProcessin
g
MusicStore
ShoppingCart
mySQL
redis
mySQL
mySQL
session
cache
GitHub repo: https://github.com/SteeltoeOSS/Samples/tree/master/MusicStore
ASP.NET Music Store w/Steeltoe + Circuit
Breakers
config
servergit
eureka
server
hystrix
dashboard
circuit
breakers
metrics
apps
manager

47. Roadmap & Resources

48. Unless otherwise indicated, these slides are © 2013 -2017 Piv otal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Steeltoe Roadmap
2.0-rc1 December 2017
• Full ANC 2.0 support
• CredHub support
• MS SQL Server Connector
>2.0
• New Management Endpoints – (Thread Dump, Heap Dump)
• Zipkin
• Netflix Ribbon
Looking for something else? Tell us at https://slack.steeltoe.io or submit a PR
48

49. Unless otherwise indicated, these slides are © 2013 -2017 Piv otal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Learn more → https://steeltoe.io
Clone a sample → https://github.com/SteeltoeOSS/Samples
Get the packages → https://www.nuget.org/profiles/steeltoe
Talk to us → https://slack.steeltoe.io/
Tell your friends → @SteeltoeOSS
How to get started

50. Unless otherwise indicated, these slides are © 2013 -2017 Piv otal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
.NET Resources at SpringOne
• Pivotal Demo Lounge
• Build .NET Framework, .NET Core and polyglot (Java + .NET) apps and
push them to Cloud Foundry
• Recommended sessions
• Migrating .NET and .NET Core to PCF (CapGemini)
Tues. 4:20pm Room 2012
• Tech Modernization: A Cloud Migration (Charles Schwab)
Tues. 5:00pm Room 2010
• Ensuring Platform Security w/Windows BOSH Add-ons & Runtime
Config at Boeing
Wed. 2pm Room 2024
50

51. Unless otherwise indicated, these slides are © 2013 -2017 Piv otal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Now it’s your turn to share
Cloud Foundry Summit North America 2018
April 18-20, 2018 – Boston
New track: “Cloud-Native .NET”
Call for Papers Deadline: 12/8/2017
https://www.cloudfoundry.org/event_subpages/cfna18-cfp/
51

52. Learn More. Stay Connected.
52
#springone@s1p
http://www.dot.net @dotnet
http://steeltoe.io @SteeltoeOSS