Building Cloud Apps with Microsoft Azure

201 Pages·2016·7.28 MB·English

by  Guthrie S.

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PUBLISHED BY
Microsoft Press
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Copyright © 2014 Microsoft Corporation

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Acquisitions, Developmental, and Project Editor: Devon Musgrave
Editorial Production: Flyingspress and Rob Nance
Copyeditor: John Pierce
Cover: Twist Creative • Seattle and Joel Panchot

1
Table of Contents
Introduction ............................................................................................................................................................................................ 9
Who should read this book ......................................................................................................................................................... 9
Assumptions .................................................................................................................................................................................. 9
This book might not be for you if… ......................................................................................................................................... 9
Organization of this book ..........................................................................................................................................................10
The Fix It sample application ....................................................................................................................................................12
Azure Websites ...............................................................................................................................................................................15
System requirements ....................................................................................................................................................................17
Downloads: Code samples .........................................................................................................................................................17
Acknowledgments .........................................................................................................................................................................18
Errata, updates, & book support ..............................................................................................................................................19
Free ebooks from Microsoft Press...........................................................................................................................................19
We want to hear from you .........................................................................................................................................................19
Stay in touch ....................................................................................................................................................................................19
Chapter 1 Automate everything ...............................................................................................................................................20
DevOps workflow ...........................................................................................................................................................................20
Azure management scripts ........................................................................................................................................................21
Environment creation script ......................................................................................................................................................21
Run the script ..............................................................................................................................................................................21
A look at the scripts .................................................................................................................................................................25
Parameters in the main script ..............................................................................................................................................25
Create the website ....................................................................................................................................................................25
Create the storage account ...................................................................................................................................................26
Create the databases ...............................................................................................................................................................26
Store app settings and connection strings .....................................................................................................................28
Preparing for deployment .....................................................................................................................................................29
2
Troubleshooting and error handling ................................................................................................................................ 29
Deployment script ......................................................................................................................................................................... 30
Summary ........................................................................................................................................................................................... 31
Resources .......................................................................................................................................................................................... 32
Chapter 2 Source control ............................................................................................................................................................ 33
Treat automation scripts as source code ............................................................................................................................. 33
Don’t check in secrets .................................................................................................................................................................. 34
Structure source branches to facilitate DevOps workflow ............................................................................................ 34
Add scripts to source control in Visual Studio ................................................................................................................... 36
Store sensitive data in Azure ..................................................................................................................................................... 38
Use Git in Visual Studio and Visual Studio Online ........................................................................................................... 40
Summary ........................................................................................................................................................................................... 46
Resources .......................................................................................................................................................................................... 46
Chapter 3 Continuous integration and continuous delivery ........................................................................................ 48
Continuous integration and continuous delivery workflow ......................................................................................... 48
How the cloud enables cost-effective CI and CD ............................................................................................................. 49
Visual Studio Online ..................................................................................................................................................................... 49
Summary ........................................................................................................................................................................................... 50
Resources .......................................................................................................................................................................................... 50
Chapter 4 Web development best practices ....................................................................................................................... 52
Stateless web tier behind a smart load balancer .............................................................................................................. 52
Avoid session state ........................................................................................................................................................................ 56
Use a CDN to cache static file assets ..................................................................................................................................... 56
Use .NET 4.5’s async support to avoid blocking calls ..................................................................................................... 57
Async support in ASP.NET 4.5.............................................................................................................................................. 57
Async support in Entity Framework 6 ............................................................................................................................... 58
Summary ........................................................................................................................................................................................... 59
Resources .......................................................................................................................................................................................... 60
Chapter 5 Single sign-on ............................................................................................................................................................. 62
3
Introduction to Azure Active Directory .................................................................................................................................62
Set up an Azure AD tenant ........................................................................................................................................................65
Create an ASP.NET app that uses Azure AD for single sign-on ..................................................................................75
Summary ...........................................................................................................................................................................................79
Resources ..........................................................................................................................................................................................79
Chapter 6 Data storage options ................................................................................................................................................81
Data storage options on Azure ................................................................................................................................................81
Hadoop and MapReduce ...........................................................................................................................................................83
Platform as a Service (PaaS) versus Infrastructure as a Service (IaaS) .......................................................................86
Choosing a data storage option ..............................................................................................................................................89
Demo—Using SQL Database in Azure ..................................................................................................................................91
Entity Framework versus direct database access using ADO.NET ..............................................................................96
SQL databases and the Entity Framework in the Fix It app ..........................................................................................97
Choosing SQL Database (PaaS) versus SQL Server in a VM (IaaS) in Azure ...........................................................99
Summary ........................................................................................................................................................................................ 101
Resources ....................................................................................................................................................................................... 101
Chapter 7 Data partitioning strategies ................................................................................................................................ 104
The three Vs of data storage .................................................................................................................................................. 104
Vertical partitioning ................................................................................................................................................................... 105
Horizontal partitioning (sharding) ....................................................................................................................................... 106
Hybrid partitioning..................................................................................................................................................................... 107
Partitioning a production application ................................................................................................................................ 108
Summary ........................................................................................................................................................................................ 108
Resources ....................................................................................................................................................................................... 109
Chapter 8 Unstructured blob storage .................................................................................................................................. 110
What is Blob storage? ............................................................................................................................................................... 110
Creating a storage account..................................................................................................................................................... 111
Using Blob storage in the Fix It app .................................................................................................................................... 112
Set up the Blob container ................................................................................................................................................... 112
4
Store the uploaded photo in Blob storage ................................................................................................................. 114
Display the uploaded file .................................................................................................................................................... 116
Summary ........................................................................................................................................................................................ 118
Resources ....................................................................................................................................................................................... 118
Chapter 9 Design to survive failures .................................................................................................................................... 120
Types of failures .......................................................................................................................................................................... 120
Failure scope ................................................................................................................................................................................. 120
Machine failures ..................................................................................................................................................................... 121
Service failures ........................................................................................................................................................................ 121
Region failures ........................................................................................................................................................................ 121
SLAs .................................................................................................................................................................................................. 122
Composite SLAs ...................................................................................................................................................................... 123
Cloud SLAs compared with enterprise downtime experience ............................................................................. 123
Not all cloud services have SLAs ...................................................................................................................................... 124
Not all downtime counts toward SLAs .......................................................................................................................... 124
Summary ........................................................................................................................................................................................ 124
Resources ....................................................................................................................................................................................... 125
Chapter 10 Monitoring and telemetry ................................................................................................................................ 127
Buy or rent a telemetry solution .......................................................................................................................................... 127
Log for insight .............................................................................................................................................................................. 139
Log in production .................................................................................................................................................................. 140
Differentiate logs that inform from logs that require action ............................................................................... 140
Configure logging levels at run time ............................................................................................................................. 141
Log exceptions ........................................................................................................................................................................ 141
Log calls to services ............................................................................................................................................................... 142
Use an ILogger interface ..................................................................................................................................................... 142
Semantic logging ................................................................................................................................................................... 142
Logging in the Fix It app ......................................................................................................................................................... 143
The ILogger interface ........................................................................................................................................................... 143
5
The Logger implementation of the ILogger interface ............................................................................................ 143
Calling the ILogger methods ............................................................................................................................................. 144
Dependency injection in the Fix It app .............................................................................................................................. 146
Built-in logging support in Azure ........................................................................................................................................ 147
Summary ........................................................................................................................................................................................ 150
Resources ....................................................................................................................................................................................... 150
Chapter 11 Transient fault handling .................................................................................................................................... 153
Causes of transient failures ..................................................................................................................................................... 153
Use smart retry/back-off logic to mitigate the effect of transient failures ......................................................... 153
Circuit breakers ............................................................................................................................................................................ 155
Summary ........................................................................................................................................................................................ 156
Resources ....................................................................................................................................................................................... 156
Chapter 12 Distributed caching ............................................................................................................................................. 158
What is distributed caching? .................................................................................................................................................. 158
When to use distributed caching ......................................................................................................................................... 159
Popular cache population strategies .................................................................................................................................. 159
Sample cache-aside code for the Fix It app ..................................................................................................................... 160
Azure caching services .............................................................................................................................................................. 161
ASP.NET session state using a cache provider ................................................................................................................ 161
Summary ........................................................................................................................................................................................ 161
Resources ....................................................................................................................................................................................... 162
Chapter 13 Queue-centric work pattern ............................................................................................................................ 163
Reduced latency .......................................................................................................................................................................... 163
Increased reliability .................................................................................................................................................................... 164
Rate leveling and independent scaling .............................................................................................................................. 166
Adding queues to the Fix It application ............................................................................................................................ 167
Creating queue messages ....................................................................................................................................................... 167
Processing queue messages ................................................................................................................................................... 169

6