What's cloud

• Delivery of computing services over the Internet using a pay-as-you-go pricing model.

  • in other words: a way to rent compute power and storage from someone else's data center.

• Pay-as-you-go: You're billed only for what you use.

  • Instead of maintaining CPUs and storage in your data center, you rent them for the time that you need them

    • The cloud provider takes care of maintaining the underlying infrastructure for you.

  • On-demand access:

    • You can treat cloud resources like you would your resources in your own data center. When you're done using them, you give them back

• The real value of the cloud: speed

  • Enables you to quickly solve your business challenges and bring cutting edge solutions to your users.

  • In less time than it takes to eat lunch, you can create & deploy a website on Azure

• A foundational building block of everything from digital transformation to the next big startup.

Why move to the cloud

• Move faster and innovate in ways that were once nearly impossible

• Two-trends in world:

  • Teams are delivering new features to their users at record speeds.

    • Software releases were once scheduled in terms of months or even years.

      • Today, teams are releasing features in smaller batches

        • Allows to schedule multiple releases a day

  • End users expect an increasingly rich and immersive experience with their devices and with software.

    • Many ways to interact with devices

      • E.g. they can recognize your face & voice commands

      • E.g. mobile phones, PCs, tablets, VR headsets, webpages...

  • The cloud provides on-demand access to:

    • A nearly limitless pool of raw compute, storage, and networking components.

    • Speech recognition and other cognitive services that help make your application stand out from the crowd.

    • Analytics services that enable you to make sense of telemetry data coming back from your software and devices.

• While migrating your existing apps to virtual machines is a good start, the cloud is more than just "a different place to run your virtual machines".

  • It can provide AI and machine-learning, storage (that grows with your needs) and more.

Benefits of Cloud Computing

• Not an all-or-nothing service

  • You can gradually move to cloud, called also lift and shift

• You're able to spend more time on what matters and less time managing the underlying details.

Cost effective

• Provides pay-as-you-go or consumption-based pricing model.

  • No upfront infrastructure costs

  • No need to purchase and manage costly infrastructure/hardware that you may not use to its fullest

  • The ability to pay for additional resources only when they are needed

  • The ability to stop paying for resources that are no longer needed

• Enables better cost predictions using pricing of individual resources/services.

  • You can analyze future growth using historical data.

Scalable

• Increase or decrease the resources and services used based on the demand or workload at any given time

• Cloud computing supports both:

  • Horizontal scaling

    • Scaling "out"

    • Adding more servers that function together as one unit

  • Vertical scaling

    • Scaling "up"

    • Adding resources to increase the power of an existing server

      • e.g.Add more CPUs, or add more memory

• Scaling can be done manually or automatically based on e.g.

  • specific triggers such as CPU utilization

Elastic

• Cloud computing system can automatically add & remove resources to meet the current demand.

• E.g.

  • Add resources for the peak operating hours during which most people access the application

    • Only pay for increased resources during those hours

  • Remove the resources when the traffic normalizes

    • Do not pay anymore

Current

• Eliminates the burdens of maintaining software patches, hardware setup, upgrades, and other IT management tasks

  • automatically done

• The computer hardware is maintained and upgraded by the cloud provider

  • e.g. if a disk fails it'll be replaced by the cloud provider

Reliable

• Cloud provider offers data backup, disaster recovery, and data replication services

• Redundancy is often built into cloud services architecture

  • so if one component fails, a backup component takes its place

  • this is referred to as fault tolerance and it ensures that your customers aren't impacted when a disaster occurs.

Global

• Fully redundant datacenters located in various regions all over the globe.

• Enables local presence close to your customers to give them the best response time

• Replicate your services into multiple regions for redundancy and locality

• Select a specific region to ensure you meet data-residency and compliance laws for your customers.

Secure

• You have:

  • Physical security

    • Who can access the building, who can operate the server racks, and so on

    • Walls, cameras, gates, security personnel, employees have access only to those resources that they've been authorized to manage.

  • Digital security

    • Who can connect to your systems and data over the network.

    • E.g. only authorized users to be able to log into virtual machines or storage systems running in the cloud

    • Have tools to mitigate security threats that you can use.

• Broad set of policies, technologies, controls, and expert technical skills

  • can provide better security than most organizations can otherwise achieve

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