Cloud-Native_-_ASPNETCore.pdf

Transcript

1. Cloud-Native Webinar-Reihe
   Cloud-Native: ASP.NET Core Services fit machen
   

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2. .NET Consultant @ Thinktecture AG
   Boris Wilhelms
   ▪ Architecting ☁️-native solutions
   ▪ Helps customer building Backend-Things with .NET
   ▪ Takes care of authentication & authorization / Identity Access Management Solutions
   ▪ Loves 🐧
   boris.wilhelms@thinktecture.com @boriswilhelms thinktecture.com
   ASP.NET Core Services fit machen
   Cloud-Native
   

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3. Make ASP.NET Core Services
   Cloud-Native ready!
   Is it a lot of work?
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   ASP.NET Core Services fit machen
   Cloud-Native
   

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4. No!
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   ASP.NET Core Services fit machen
   Cloud-Native
   

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5. ”… is highly distributed, must operate in a
   constantly changing environment, and is itself
   constantly changing.”
   Cornelia Davis,
   Author of
   Cloud Native Patterns: Designing change-tolerant software
   Cloud-Native Software
   5
   ASP.NET Core Services fit machen
   Cloud-Native
   

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6. Availability
   Scalability
   Resilience
   Configurability
   Observability
   Cloud-Native
   Applications
   Cloud-Native Attributes
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   ASP.NET Core Services fit machen
   Cloud-Native
   

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7. - Observability
   - Logging
   - Open Telemetry
   - Health Checks
   - Configurability
   - Resilience
   - Reverse Proxy gotchas
   Cloud-Native
   ASP.NET Core Services fit machen
   Topics for today
   7
   

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8. Observability
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   ASP.NET Core Services fit machen
   Cloud-Native
   

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9. - Use ILogger
   - Log to console
   - Log as JSON!
   Cloud-Native
   ASP.NET Core Services fit machen
   Logging
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10. - Use OpenTelemetry
    - OpenTelemetry is a collection of tools, APIs, and SDKs. Use it to instrument,
    generate, collect, and export telemetry data (metrics, logs, and traces) to help you
    analyze your software’s performance and behavior.
    - ASP.NET Core/.NET emits telemetry data consumeable by OpenTelemetry
    - Use System.Diagnostics.Activity to create custom traces
    - Use System.Diagnostics.Meter to create custom metrics
    Cloud-Native
    ASP.NET Core Services fit machen
    Observability
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11. - Ready vs Live
    - Ready:
    - Is the application ready to serve requests?
    - Only checked until ready
    - Live: Is the application still alive?
    - Checked periodically after ready check
    - Keep them simple!
    - Keep “Live” health checks even simpler!
    - Don’t check for dependencies
    - This might result in unnecessary restarts of container
    Cloud-Native
    ASP.NET Core Services fit machen
    Health Checks
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12. Configurability
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    ASP.NET Core Services fit machen
    Cloud-Native
    

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13. ConfigurationBuilder merges the values of different providers together
    1. appsettings.json
    2. appsettings.{environment}.json (ASPNETCORE_ENVIRONMENT)
    3. User Secrets (read once at startup in development)
    4. Environment variables (read once at startup)
    5. Commandline arguments (read once at startup)
    Cloud-Native
    ASP.NET Core Services fit machen
    How does configuration work in ASP.NET Core?
    13
    

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14. - All these providers provide only a snapshot at startup
    - Microsoft.Extensions.Configuration.KeyPerFile to the rescue!
    - Maps a folder of files into the configuration
    - Filename is the key
    - Content of the file is the key
    - Can be used for e.g. ConfigMaps in Kubernetes
    Cloud-Native
    ASP.NET Core Services fit machen
    How does configuration work in ASP.NET Core?
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15. Resilience
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    ASP.NET Core Services fit machen
    Cloud-Native
    

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16. - Be prepared that a dependency is not there!
    - Let the platform handle resilience if possible!
    - If not:
    - Some libraries have retries and fallbacks build in (e.g. Azure Storage SDK)
    - EF Core: “EnableRetryOnFailure” or custom “Execution strategies”
    - Everything else: Use Polly
    - Polly is a .NET resilience and transient-fault-handling library that allows developers to express
    policies such as Retry, Circuit Breaker, Timeout, Bulkhead Isolation, and Fallback in a fluent
    and thread-safe manner.
    Cloud-Native
    ASP.NET Core Services fit machen
    Resilience
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17. Reverse Proxy gotchas
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    ASP.NET Core Services fit machen
    Cloud-Native
    

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18. Cloud-Native
    ASP.NET Core Services fit machen
    How do reverse proxies work?
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    https://myapp.com/api/products
    https://myapp.com/api/orders
    IP: 212.127.12.13
    External IP: 112.22.15.43
    Internal IP: 10.0.0.1
    

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19. Reverse Proxy gotchas
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    ASP.NET Core Services fit machen
    Cloud-Native
    

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20. - A reverse proxies
    - receives the request from the client
    - inspects the request to find the proper target
    - makes the actual http request to the container/service
    - adds additional headers with data about the client and the called URLs (X-Forwarded-*)
    - The service
    - sees the reverse proxy as a client
    - will be called with a different url/host then it is reachable from the internet
    - might have different HTTP routes then the reverse proxy
    - Proxy Route: /api/products
    - Service Route /products
    Cloud-Native
    ASP.NET Core Services fit machen
    How do reverse proxies work?
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21. - Let the platform handle things, if possible!
    - There is not much to do to be cloud-native ready!
    - Make infrastructure components as configurable as possible!
    - Use (defacto-)standards where possible!
    - Be aware of reverse proxy! They are everywhere!
    Cloud-Native
    ASP.NET Core Services fit machen
    Conclusion
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22. thinktecture.com/
    cloud-30-11-2022
    thinktecture.com/
    cloud-25-01-2023
    Cloud-Native Webinar-Reihe – weitere Termine
    thinktecture.com/
    cloud-14-12-2022
    thinktecture.com/
    cloud-11-01-2023
    Alle Webinare unserer Cloud-Native-Reihe
    finden Sie hier:
    thinktecture.com/cloud-native-webinare/
    03. November 2022 – 25. Januar 2023
    ASP.NET Core Services fit machen
    Cloud-Native
    22
    

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23. https://www.thinktecture.com/ueber-uns/karriere/
    Dankeschön!
    Demos aus der Session:
    https://github.com/thinktecture-labs/aspnetcore-
    cloudnative
    Boris Wilhelms
    https://thinktecture.com/boris-wilhelms
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