How to crack the Azure AZ-900 exam in 7 days – Part 2 [Understand core Azure services (30-35%)]

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    Describe some of the core products available in Azure

    • Describe products available for Compute such as Virtual Machines, Virtual Machine Scale Sets, App Service Functions, Azure Container Instances (ACI) and Azure Kubernetes Service (AKS)
    • Describe products available for Networking such as Virtual Network, Load Balancer, VPN Gateway, Application Gateway and Content Delivery Network
    • Describe products available for Storage such as Blob Storage, Disk Storage, File Storage, and Archive Storage
    • Describe products available for Databases such as Cosmos DB, Azure SQL Database, Azure Database for MySQL, Azure Database for PostgreSQL, Azure Database Migration service
    • Describe the Azure Marketplace and its usage scenarios


    There are four common techniques for performing compute in Azure:
    1) Virtual machines
    2) Containers
    3) Azure App Service
    4) Serverless computing

    1) Virtual machines, or VMs is software copy of physical computers. They include a virtual processor, memory, storage, and networking resources. They host an operating system (OS).
    Azure Virtual Machines:- VMs are an ideal choice when you need:

    • Total control over the operating system (OS)
    • The ability to run custom software, or
    • To use custom hosting configurations

    Availability sets :- An availability set is a logical grouping of two or more VMs that help keep your application available during planned or unplanned maintenance.

    Virtual Machine Scale Set:- Azure Virtual Machine Scale Sets let you create and manage a group of identical, load balanced VMs.

    • Scale sets allow you to centrally manage, configure, and update a large number of VMs in minutes to provide highly available applications.
    • The number of VM instances can automatically increase or decrease in response to demand or a defined schedule.
    • With Virtual Machine Scale Sets, you can build large-scale services for areas such as compute, big data, and container workloads.

    Azure Batch:- Azure Batch enables large-scale job scheduling and compute management with the ability to scale to tens, hundreds, or thousands of VM
    Batch does :-

    • Starts a pool of compute VMs for you
    • Installs applications and staging data
    • Runs jobs with as many tasks as you have
    • Identifies failures
    • Requeues work
    • Scales down the pool as work completes

    Azure supports Docker containers (a standardized container model), and there are several ways to manage containers in Azure:-
    1) Azure Container Instances (ACI) – Azure Container Instances (ACI) offers the fastest and simplest way to run a container in Azure.
    ** You don’t have to manage any virtual machines or configure any additional services.
    ** It is a PaaS offering that allows you to upload your containers and execute them directly with automatic elastic scale.
    2) Azure Kubernetes Service (AKS) – The task of automating, managing, and interacting with a large number of containers is known as orchestration.
    ** AKS is a complete orchestration service for containers with distributed architectures with multiple containers.

    2) Containers are a virtualization environment for running applications just like virtual machines, containers are run on top of a host operating system.

    Important Points for Containers :-
    ** Containers don’t include an operating system for the apps running inside the container.
    ** Containers bundle the libraries and components needed to run the application and use the existing host OS running the container

    3) Azure App Service is a platform-as-a-service (PaaS) , Azure that is designed to host enterprise-grade web-oriented applications.

    Important Points for Azure App Service :-
    ** It enables you to build and host web apps, background jobs, mobile backends, and RESTful APIs in the programming language of your choice without managing infrastructure.
    ** It offers automatic scaling and high availability. App Service supports both Windows and Linux, and enables automated deployments from GitHub, Azure DevOps, or any Git repo to support a continuous deployment model.

    Common web app styles supported by Web Apps:-
    1) Web Apps
    2) API Apps
    3) WebJobs
    4) Mobile Apps

    4) Serverless computing is a cloud-hosted execution environment that runs your code but completely abstracts the underlying hosting environment.

    Important Points for Azure Serverless Computing :-
    ** Serverless computing is the abstraction of servers, infrastructure, and OSs.
    ** Azure takes care of managing the server infrastructure and allocation/deallocation of resources based on demand

    Azure has two implementations of serverless compute:
    1) Azure Functions, which can execute code in almost any modern language.
    2) Azure Logic Apps, which are designed in a web-based designer and can execute logic triggered by Azure services without writing any code.

    1 Comment

    arvindshrivastava · April 29, 2020 at 8:55 pm

    Thanks a lot for your kind words. Happy to spread the light of knowledge.

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