- Project Kudu is an open source .NET Foundation project that powers deployments and hosting for Azure Web Apps, WebJobs, and Mobile Services. It provides features like configurable build steps, diagnostic tools, and APIs. - Azure Web Apps provides auto-scaling, high availability, continuous deployment from sources like Git, and supports languages like .NET, Java, PHP, Node.js, and Python. - Kudu provides access to sites through its console and APIs, allowing diagnostic dumps, file browsing, and customizing deployment pipelines through scripts.

1. Kudu Voodoo
–Project Kudu Overview & Advanced Azure Web Apps
Features
Azure Dublin Meetup | Feb 2016

2. Aidan Casey |Microsoft Azure MVP| @AIDANJCASEY

3. Azure Web Apps
• PaaS – fully managed web application hosting
• Supports .NET, Java, PHP, Node.js, and Python
• Autoscale and load balancing
• High availability with auto patching
• Continuous deployment with Git, TFS, GitHub, Dropbox, and Visual Studio
Team Services
• Many ways to work with the platform - Azure Portal, Azure CLI, Azure
SDK’s

4. Project Kudu
• Open source .NET Foundation https://github.com/projectkudu/kudu
• Powers deployments for
 WebApps / WebSites
 WebJobs
 Mobile Services
• Can also run outside of Azure
• Git deployments
• Configurable build steps
• Sandboxing
• Hosting & Metering
• Diagnostic tools & API’s

5. Architecture…
http://www.slideshare.net/kashifx/azure-websites-40718659

6. Azure
LB
Runtime
DB
Storage
Controller
IIS ARR
(LB)
Web Worker
Other
databases
1st request (cold site)

7. Storage
Controller
IIS ARR
(LB)
Web Worker
Other
databases
xth request (hot site)
Azure
LB

8. Service Plans and Features
free shared basic standard Premium
When to use spikes ,
goofing around
dev - test with
SSL
production
low traffic
workloads
production
with advanced
autoscale &
traffic
management
production
more advances
– biztalk
connectors etc
# cores Shared, 60
mins CPU per
day
shared, 240
mins CPU per
day
1-4 1-4 1-8
RAM 1GB .5GB 1.75-7GB 1.75-7GB 1.75-14GB
SLA 99.95% 99.95% 99.95%
custom domain
& certs
no yes yes yes yes
Remote
profiling
no no no yes yes

9. Deployment Slots
• Standard and Premium Mode Only
• Hot swap with no requests dropped
• Custom warm up application hooks
• Rollback
• AppSettings can be made slot specific
• Can configure auto swapping
• % traffic routing via Azure Traffic Routing

10. Demo
zero downtime with deployment
slots

11. Auto Healing
• Standard and Premium Mode Only
• Auto detect certain conditions and automatically recover
- Recycle based on Request Count
- Recycling based on slow requests
- If you have multiple instances of your web site, it will only restart the
worker process for the instance that has hit this trigger and not all
instances.

12. Application Log Streaming
• 3 types of logs
 Detailed Error Logging
 Failed Request Tracing
 Web Server Logging (W3C extended log format)
• Can log to the file system (rolling files) , table storage or blob storage
• When you enable application logging in azure websites its on for 12 hours….

13. Demo
log tailing from the Azure CLI

14. Kudu Site
{yoursite}.scm.azurewebsites.net
• The Kudu site runs in the same sandbox as your real site. This has some
important implications
• It cannot do anything that the site itself wouldn't be able to do itself
• It shares the same quotas as the site. That is, the CPU/RAM/Disk used by
the Kudu service is counted toward the site's quota
• It relies on the security model of the Azure Web Site runtime

15. Kudu Console & API
both command line and file browser access to your sites
• Diagnostic dumps
• Process Explorer
• WebHooks
• File Explorer
• Site Extensions
• Runtime Environment & Variables

16. Demo
post deployment webhooks

17. Demo
remote profiling a .NET Web
App

18. Demo
remote debugging a .NET Web
App

19. Customising the deployment pipeline
The Azure CLI command “$ azure site deploymentscript ” generates
deployment scripts that are used by kudu, you can customise these files
• .deployment file
 [config]
command=<whatever command>
• Write in batch file, bash script, PHP, JavaScript, …
 Can do things like
 download extra tools
 pull in external repos / packages
 shell out to command line tools ( msbuild, nugget, curl etc)

20. Demo
running unit tests in Azure as
part of a deployment pipeline

21. Site Extensions
• Add additional tools to your website
• Install site extensions through the portal or the kudu site
• Site Extension Gallery : http://www.siteextensions.net
• Build & publish your own !

22. Demo
Using site extensions -visual
studio online monaco code
editor

23. Best Practices
• Autoscale on & Stick sessions off
• Back up your database
• Load test before going live
• Configure automatic failover using Azure Global Traffic Manager
• Automate deployments using slots
• Test site recovery
• Use azure resource groups
• Set billing alerts
• Bundle & minify web resources
• Use Azure CDN to edge cache static files
• Implement the appropriate DB retry policies

24. Key Takeaways
• Azure Web Apps features- deploy slots, hot swapping, auto scaling, git
deployments , customisable pipeline, remote profiling, site extensions
• Your Web App is only loaded into IIS when its in use
• Kudu is the open source deployment engine behind web apps
• Advanced support for .NET apps via remote profiling and remote debugging
• No SLA availale for basic of free tier offering