Microsoft Azure Cloud Series – Understanding the Stack, Who Manages What? – Part 2

In today’s IT, there are lot of discussions in the about different terms like PaaS, IaaS, and SaaS.  So what do all of these cloud acronyms mean?

I’m going to give you the simplest explanation I can, to help you understand the difference between SaaS, IaaS, and PaaS. First, let’s expand those acronyms! Software as a Service, Infrastructure as a Service, and Platform as a Service are all just different types of clouds.

Understanding the Stack

New Choices for Delivering IT

The cloud provides options for approach, sourcing, and control.  It delivers a well-defined set of services, which are perceived by the customers to have infinite capacity, continuous availability, increased agility, and improved cost efficiency. To achieve these attributes in their customers’ minds, IT must shift its traditional server-centric approach to a service-centric approach.  This implies that IT must go from deploying applications in silos with minimal leverage across environments to delivering applications on pre-determined standardized platforms with mutually agreed upon service levels.  A hybrid strategy that uses several cloud options at the same time will become the norm as organizations choose a mix of various cloud models to meet their specific needs.

Typical Service Models

Software as a Service

Software as a Service (SaaS) delivers business processes and applications, such as CRM, collaboration, and email, as standardized capabilities for a usage-based cost at an agreed, business-relevant service level. SaaS provides significant efficiencies in cost and delivery in exchange for minimal customization and represents a shift of operational risks from the consumer to the provider. All infrastructure and IT operational functions are abstracted away from the consumer.

Platform as a Service

Platform as a Service (PaaS) delivers application execution services, such as application runtime, storage, and integration for applications written for a pre-specified development framework. PaaS provides an efficient and agile approach to operate scale-out applications in a predictable and cost-effective manner. Service levels and operational risks are shared because the consumer must take responsibility for the stability, architectural compliance, and overall operations of the application while the provider delivers the platform capability (including the infrastructure and operational functions) at a predictable service level and cost.

Infrastructure as a Service

Infrastructure as a Service (IaaS) abstracts hardware (server, storage, and network infrastructure) into a pool of computing, storage, and connectivity capabilities that are delivered as services for a usage-based (metered) cost. Its goal is to provide a flexible, standard, and virtualized operating environment that can become a foundation for PaaS and SaaS.

IaaS is usually seen to provide a standardized virtual server. The consumer takes responsibility for configuration and operations of the guest Operating System (OS), software, and Database (DB). Compute capabilities (such as performance, bandwidth, and storage access) are also standardized.
Service levels cover the performance and availability of the virtualized infrastructure. The consumer takes on the operational risk that exists above the infrastructure.

Understanding the Stack

Infrastructure as a Service with Azure Virtual Machines

In short, IaaS gives you a server in the cloud (virtual machine) that you have complete control over. With an Azure VM, you are responsible for managing everything from the Operating System on up to the application you are running.

On-demand data centers, also known as IaaS, provide compute power, memory, and storage, typically priced per hour, based on resource consumption. You pay only for what you use, and the service provides all the capacity you need, but you are responsible for monitoring, managing, and patching your on-demand infrastructure.

The biggest advantage of IaaS is that it offers a cloud-based data center without requiring you to install new equipment or to wait for the hardware procurement process. This means you can get IT resources that otherwise might not be available.

This mode of operation will feel most like a typical on premises virtual machine where you remote desktop into the server to manage it instead of sitting down in front of a physical keyboard and mouse.

Platform as a Service – Azure Cloud Services

An Azure Cloud Service consists of two components: your application files (source code, DLLs, etc.) and a configuration file. Together, these two elements will spin up a combination of Web Roles and Worker Roles to execute your application. With Cloud Services, Azure handles all of the tedious Operating System details for you, so you can focus on what matters – building a quality application for your users.

A Web Role is an Azure VM that is pre-configured as a web server (running IIS) and will automatically have your application loaded on it by the time the server fully spins up. This will create the public endpoint for your application – usually a website, but it could also be an API or something similar.

Worker Roles run alongside your Web Roles and are responsible for performing computing functions to support your application. Typically, the Web Role will accept some sort of user input and queue up an action for the Worker Role to process at a later time. This allows the Web Roles to be more responsive and to fire-and-forget tasks to be processed later.

Understanding the Stack

Software as a Service – Basecamp, Salesforce, Office 365, Azure Websites

Finally, Software as a Service applications are built and hosted through 3rd party vendors who typically charge for a certain level of service – $30/month for X projects and Y users.

Azure Websites can serve as a SaaS offering as well. You can configure a WordPress, Drupal, OpenX, or even phpBB site with a single click. No code, no deployment hassles, and minimal configuration. Azure Websites lets you stand up the service you need in minutes, not hours or days.

Most SaaS applications today are built on a cloud platform due to the low cost of entry – with prices continually falling – and the ability to scale up as your customer base grows. If Dropcam, SmugMug, or Netflix got one million new customers tomorrow, their infrastructure (Amazon Web Services) would be able to accommodate them.

Conclusion

  • Software-as-a-Service (SaaS) means you’re renting the app or software
  • Platform-as-a-Service (PaaS) means that you’re renting everything but the app or software
  • Infrastructure-as-a-Service (IaaS) means you’re renting only the hardware as well as the tools used to manage the hardware

While each Azure Compute (IaaS) offering has their pros and cons, I personally prefer to build my projects around PaaS. With PaaS, you get the maximum possible amount of flexibility before you have to start worrying about the tedious world of OS maintenance, versions, security, patches, etc. Until next time, Rob.

Microsoft Azure Cloud Series – What is Cloud? – Part 1

Hi All, its Rob again and I decided to write a series on Azure Cloud.  Since Azure Stack is months away from GA, its good to understand Azure Cloud for a few reasons.  The API is the consistent across Azure Cloud and Azure Stack. And building a hybrid environment is the future for IT to use features like DR, Application Portability and Backup.

So, let’s start from the beginning and go over the fundamental terms.

What is Cloud? Simply put, it’s a large number of devices connected through wide communication network.

What are the benefits of Cloud?

  • Provide Services at much lower cost
  • Flexibility on technology that gives the customer a competitive advantage
  • Helps IT to be more efficient on operations
  • Pays as they go and for what they use
  • Move to OPEX model from CAPEX model
  • Faster deployment

Types of Clouds and Examples

Private

  • A private cloud is dedicated to the customer’s organization.
  • On-premises (their own data center) or in a partner’s hosting facility.
  • More control over the level of security, privacy, customization, and governance of your software and services.
  • More cost-effective data center operations using the customer’s existing investments in people and equipment.
  • Example: Customer needs dedicated resources and wants to restrict access to all content in the cloud

Public

  • The public cloud is where cloud services are provided in a virtualized environment.
  • Resources are available on demand.
  • Centralized operation and resource management are shared.
  • Customers can access the resource they need, and then only pay for what they use.
  • Many services are available that are ready to be accessed from any internet enabled device.
  • Example: Customer can share resources and wants to pay when they use the resource

Hybrid

  • A hybrid cloud is an integrated service utilizing on-premises resources, private clouds and public clouds.
  • Moving non-sensitive functions to the public cloud allows an organization to benefit from public cloud scalability while reducing the demands on a private cloud.
  • The availability of secure resources and scalable cost-effective public resources provides organizations with options.
  • Example: Customer has secure and non-secure data and they have made some investment in their own infrastructure and they want to use them

Industry Tends

Industrytrendsazure Cloud

As we look at the IT industry today, a number of important trends are changing the way software is being purchased, deployed and used in the organization.

Data Explosion

The volume of data in the workplace is exploding. According to IDC, digital data will grow more than 40x over the next decade. As more and more data is created digitally, we expect to see ever greater demands being placed on our data platforms to store, secure, process and manage these large volumes of data.

Consumerization of IT

Today we see an increasing trend toward the “consumerization” of IT—creating the demand for Web 2.0 experiences in the business environment. As consumers, we are accustomed to powerful user-friendly experiences, whether searching the Internet on a mobile device to find information instantly, or quickly accessing our personal financial data. In the workplace, however, we are often unable to answer even the most basic questions about our business. Increasingly, users demand business experiences that more closely mirror the convenience and ease of use in consumer life.

Private and Public Cloud

Cloud computing is changing the way data is accessed and processed, and it is creating whole new models for the way applications are delivered. According to IDC, Cloud services will account for 46% of net-new growth in overall IT spending. With private and public cloud infrastructure, organizations have an opportunity to reduce TCO dramatically as data volume increases. As we see an evolution toward greater use of private and public clouds, we see an increasing need for solutions that support hybrid cloud scenarios.

Azure at a Glance

azure-overview Cloud

So this picture, or at least the big blocks above, are how Microsoft thinks about the main capability buckets of their platform. As we go though this series, we will start to get more specific about these buckets (Compute, data, networks, and app services).

Well, I hope you enjoyed this brief introduction on Azure Cloud.  Stay tuned to the rest of the series. Next up, more fundamentals and use cases and then we dive into some fundamentals, like Azure Resource Manager.  Until next time, Rob