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PDF Developing Multi-tenant Applications for the Cloud on Windows Azure (Microsoft patterns & practices)

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Description How can you create an application that has truly global reach, and can scale rapidly to meet sudden massive spikes in demand? Historically, companies had to invest in an infrastructure capable of supporting such an application themselves, and plan for peak demand-which often means that much of the capacity sits idle for much of the time.

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Typically, only large companies would have the available resources to risk such an enterprise. The cloud has changed the rules of the game. By making infrastructure available on a "pay as you go" basis, creating a massively scalable, global application is within the reach of both large and small companies. Yes, by moving applications to the cloud you're giving up some control and autonomy, but you're also going to benefit from reduced costs, increased flexibility, and scalable computation and storage. This guide is the third release of the second volume in a series about Windows Azure.

It demonstrates how you can create from scratch a multi-tenant, Software as a Service SaaS application to run in the cloud by using the Windows Azure tools and the increasing range of capabilities of Windows Azure. The guide focuses on both good practice design and the practicalities of implementation for multi-tenant applications, but also contains a wealth of information on factors such as security, scalability, availability, and elasticity that are relevant to all types of cloud hosted applications. The guide is intended for any architect, developer, or information technology IT professional who designs, builds, or operates applications and services that run on or interact with the cloud.

Although applications do not need to be based on the Windows operating system to work in Windows Azure, or be written using a. NET language, this guide is written for people who work with Windows based systems. You should be familiar with the.


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An expert on developing applications with the Microsoft. NET Framework and Windows Azure, Dominic has produced numerous training courses, white papers, and other technical material on. He spends his days knee-deep in design patterns and architectural literature; writing books, documentation, sample code, and producing technical guidance in its myriad other forms.

Alejandro Jezierski is a senior software developer at Southworks. Masashi Narumoto is passionate about the idea of the Internet as a knowledgebase. The Internet has significantly changed our lives and there's no doubt that there are still huge changes to come. Unit testing of the code is normally completed locally by the developer using different types of testing tools, such as automated unit tests and web tests. Azure Developer Tools contain emulators for some of the Azure environments, including cloud services and storage. These tools are provided for developers to unit test their application code before deploying it to Azure.

Five things every cloud developer needs to know about Windows Azure

To ensure a smooth transition of the application to the cloud, I recommend using the following method:. Microsoft has implemented remote debugging for Visual Studio.

Building Multitenant SaaS Applications with Tenant Isolation and Unlimited Scale with SQL Database

I recommend a hybrid approach to ensure our code will run on Azure — test locally using emulators and then move the application to cloud. There are a few steps to take in order to do an Azure deploy. First the code is tested and then synchronized with the source code manager. Then the engine and versions are added to all assemblies.

And finally after the code is compiled, a package is created so it can be uploaded to the Azure platform. All applications are prepared for a release and published at some point in their lifecycle. We need to validate our Azure hosting environment first. Then, we need to focus on the host, management and execution of our cloud application. After that, we purchase a subscription, and finally, we can manually upload our deployment package to our staging or production environments. Microsoft provides several tools that can help optimize and automate the deployment process.

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The API can be used to interface with the management portal and create a package one config file and one package file directly from a VS project. That package can then be uploaded to the specific cloud environment Azure Service.

Developing Multi-Tenant Applications for the Cloud on Windows Azure

An alternative method to do that is using some of the DevOps tools I referred to above in order to deploy to Azure. With your application up and running in Azure, you need to be able to monitor performance, watch for issues and see how customers are using your app. Finally, a developer can use the Azure Management portal to manage an already deployed application. Each Azure service provides access to a few managed environments — the so-called deployment slots.

They can be used for Staging, Production or any other environment we want to deploy to and use in the Azure cloud. There is no rule dictating the environments we must use. We can deploy our application directly to the production environment or deploy it to staging. Microsoft provides a SWAP procedure that will do a transition switch between one deployment slot and another one. It is important for the production environment IP address to stay the same. That is the Virtual IP address on Azure. It can even be used in preview mode so we can be absolutely sure that it will work after the SWAP process has finished.

From a development perspective, I recommend deploying the package first to the staging environment, so the application can be tested in a separate QA-like environment. Then, promote it to production for release. This approach will ensure the tested release of the application is ready for public use. System Testing. In this phase, different application tests are carried out. These are a representative set of tests that can be carried out as a part of the development lifecycle on the Azure platform, which an enterprise can run as a part of their standard project delivery practices.

All of these tests are carried out on the Azure platform without any investments required for procuring or setting up separate test environments on-premise.


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These tests can be carried out in the default staging environment, as discussed previously, or separate environments, in the case of larger projects, to carry out each test. Production Release. The promoted services will execute from the production regions of the Azure data center fabric. In the production stage, the services are configured, managed and monitored from the Windows Azure portal.

Unlike traditional on-premise systems, Azure does not provide full control of the computing environment and resources to administrators. Users are only provided with private virtualized instances, packaged as services, as the unit of computation and storage for hosting their apps.

This will require a shift in the IT support operations. The Azure of today does not permit administrators to deploy some of the custom or third-party tools, utilities, agents, etc. Administrators use these tools to investigate production-related issues such as poor performance and crashes. A cloud-based application can run into different problems related to environments and architecture. Microsoft works consistently to avoid most of the problems by creating and proposing specific patterns to be used during the application development process.

They are grouped in following areas. The time that the system is functional and working. It will be affected by system errors, infrastructure problems, malicious attacks and system load. It is usually measured as a percentage of uptime. A key feature of most cloud applications is the ability to manage data under different conditions. Data is typically hosted in different locations and across multiple servers for reasons such as performance, scalability or availability, and this can present a range of challenges.

Microsoft Azure development best practices for design considerations should include consistency and coherence in component design and deployment, maintainability to simplify administration and development and the reusability of components and subsystems.

Five things every cloud developer needs to know about Windows Azure

Decisions made during the design and implementation phase have a huge impact on the quality and the total cost of ownership of cloud-hosted applications and services. Cloud-based applications need a reliable communication channel that connects components and services ideally in a loosely coupled manner in order to maximize the scalability of distributed applications.

Asynchronous messaging is widely used and provides many benefits, but also brings challenges such as the ordering of messages, poison message management and idempotency etc. Most cloud applications use the PaaS layer of the cloud. It brings great flexibility, scalability and expense reduction in development and administration efforts but can make management and monitoring more difficult than an on-premises deployment. Applications must expose runtime information that administrators and operators can use to manage and monitor the system, as well as support changing business requirements and customization without requiring the application to be stopped or redeployed.

Performance is an indication of the responsiveness of a system to execute any action within a given time interval, while scalability is the ability of a system either to handle increases in load without an impact on performance or increase available resources. Cloud applications typically encounter variable workloads and peaks in activity.