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Discover the Future: Unleashing the Power of Azure Cloud Computing

Azure

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What are the
Service Model in Cloud Computing?

Cloud computing providers offer their services according to three
fundamental models: Infrastructure as a service (IaaS), platform as a
service (PaaS), and software as a service (SaaS) where IaaS is the most
basic and each higher model abstracts from the details of the lower
models. Examples of IaaS include: Amazon CloudFormation (and underlying
services such as Amazon EC2), Rackspace Cloud, Terremark, Windows Azure
Virtual Machines, Google Compute Engine. and Joyent. Examples of PaaS
include: Amazon Elastic Beanstalk, Cloud Foundry, Heroku, Force.com,
EngineYard, Mendix, Google App Engine, Windows Azure Compute and
OrangeScape. Examples of SaaS include: Google Apps, Microsoft Office
365, and Onlive.

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How many
Types of Deployment Models are used in Cloud?

There are 4 types of deployment models used in cloud: + Public cloud
+ Private cloud + Community cloud + Hybrid cloud

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What is Windows Azure
Platform?

A collective name of Microsoft’s Platform as a Service (PaaS)
offering which provides a programming platform, a deployment vehicle,
and a runtime environment of cloud computing hosted in Microsoft
datacenters.

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What are the
Roles Available in Windows Azure?

All three roles (web, worker, VM) are essentially Windows Server
2008. Web and Worker roles are nearly identical: With Web and Worker
roles, the OS and related patches are taken care for you; you build your
app’s components without having to manage a VM.

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What
is difference between Windows Azure Platform and Windows Azure?

The former is Microsoft’s PaaS offering including Windows Azure, SQL
Azure, and Appfabric; while the latter is part of the offering and the
Microsoft’s cloud OS.

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What
are the three Types of Roles in Compute Component in Windows Azure?

  • WEB
  • Worker
  • VM

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What is Windows Azure
Compute Emulator?

The compute emulator is a local emulator of Windows Azure that you
can use to build and test your application before deploying it to
Windows Azure.

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What is Fabric?

In the Windows Azure cloud fabric is nothing but a combination of
many virtualized instances which run client application.

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How
many instances of a Role should be deployed to Satisfy Azure Sla?

TWO. And if we do so, the role would have external connectivity at
least 99.95% of the time.

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What
are the options to manage Session State in Windows Azure?

► Windows Azure Caching ► SQL Azure ► Azure Table

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What is Cspack?

It is a command-line tool that generates a service package file
(.cspkg) and prepares an application for deployment, either to Windows
Azure or to the compute emulator.

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What is Csrun?

It is a command-line tool that deploys a packaged application to the
Windows Azure compute emulator and manages the running service.

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What is Guest Os?

It is the operating system that runs on the virtual machine that
hosts an instance of a role.

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How
to programmatically Scale Out Azure Worker Role Instances?

Using AutoScaling Application Block.

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What is Web Role in Windows
Azure?

Web roles in Windows Azure are special purpose, and provide a
dedicated Internet Information Services (IIS) web-server used for
hosting front-end web applications. You can quickly and easily deploy
web applications to Web Roles and then scale your Compute capabilities
up or down to meet demand.

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What
is the difference between Public Cloud and Private Cloud?

Public cloud is used as a service via Internet by the users, whereas
a private cloud, as the name conveys is deployed within certain
boundaries like firewall settings and is completely managed and
monitored by the users working on it in an organization.

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What is Windows Azure
Diagnostics?

Windows Azure Diagnostics enables you to collect diagnostic data from
an application running in Windows Azure. You can use diagnostic data for
debugging and troubleshooting, measuring performance, monitoring
resource usage, traffic analysis and capacity planning, and
auditing.

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What is Blob?

BLOB stands for Binary Large Object. Blob is file of any type and
size. The Azure Blob Storage offers two types of blobs: 1. Block Blob 2.
Page Blob URL format: Blobs are addressable using the following URL
format: http://.blob.aaa.windows.net//

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What is
the difference between Block Blob Vs Page Blob?

Block blobs are comprised of blocks, each of which is identified by a
block ID. You create or modify a block blob by uploading a set of blocks
and committing them by their block IDs. If you are uploading a block
blob that is no more than 64 MB in size, you can also upload it in its
entirety with a single Put Blob operation. -Each block can be a maximum
of 4 MB in size. The maximum size for a block blob in version 2009-09-19
is 200 GB, or up to 50,000 blocks. Page blobs are a collection of pages.
A page is a range of data that is identified by its offset from the
start of the blob. To create a page blob, you initialize the page blob
by calling Put Blob and specifying its maximum size. -The maximum size
for a page blob is 1 TB. A page written to a page blob may be up to 1 TB
in size. what to use block blobs for: streaming video. “The application
must provide random read/write access” which is supported by Page
Blobs

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What
is the difference between Windows Azure Queues and Windows Azure Service
Bus Queues?

Windows Azure supports two types of queue mechanisms: Windows Azure
Queues and Service Bus Queues . Windows Azure Queues: which are part of
the Windows Azure storage infrastructure, feature a simple REST-based
Get/Put/Peek interface, providing reliable, persistent messaging within
and between services. Service Bus Queues: are part of a broader Windows
Azure messaging infrastructure that supports queuing as well as
publish/subscribe, Web service remoting, and integration patterns.

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What is Deadletter Queue?

Messages are placed on the deadletter sub-queue by the messaging
system in the following scenarios. ► When a message expires and
deadlettering for expired messages is set to true in a queue or
subscription. ► When the max delivery count for a message is exceeded on
a queue or subscription. ► When a filter evaluation exception occurs in
a subscription and deadlettering is enabled on filter evaluation
exceptions.

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What are Instance Sizes of
Azure?

Windows Azure will handle the load balancing for all the instances
that are created. The VM sizes are as follows: Compute Instance Size CPU
Memory Instance Storage I/O Performance ► Extra Small 1.0 Ghz 768 MB 20
GB Low ► Small 1.6 GHz 1.75 GB 225 GB Moderate ► Medium 2 x 1.6 GHz 3.5
GB 490 GB High ► Large 4 x 1.6 GHz 7 GB 1,000 GB High ► Extra large 8 x
1.6 GHz 14 GB 2,040 GB High

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What is Table Storage in
Windows Azure?

The Windows Azure Table storage service stores large amounts of
structured data. The service is a NoSQL datastore which accepts
authenticated calls from inside and outside the Windows Azure cloud.
Windows Azure tables are ideal for storing structured, non-relational
data Table: A table is a collection of entities. Tables don’t enforce a
schema on entities, which means a single table can contain entities that
have different sets of properties. An account can contain many tables
Entity: An entity is a set of properties, similar to a database row. An
entity can be up to 1MB in size. Properties: A property is a name-value
pair. Each entity can include up to 252 properties to store data. Each
entity also has 3 system properties that specify a partition key, a row
key, and a timestamp. Entities with the same partition key can be
queried more quickly, and inserted/updated in atomic operations. An
entity’s row key is its unique identifier within a partition.

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Difference
between Web and Worker Roles in Windows Azure?

The main difference between the two is that an instance of a web role
runs IIS, while an instance of a worker role does not. Both are managed
in the same way, however, and it’s common for an application to use
both.For example, a web role instance might accept requests from users,
then pass them to a worker role instance for processing.

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What is Azure Fabric
Controller?

The Windows Azure Fabric Controller is a resource provisioning and
management layer that manages the hardware, and provides resource
allocation, deployment/upgrade, and management for cloud services on the
Windows Azure platform.

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What is Autoscaling?

Scaling by adding additional instances is often referred to as
scaling out. Windows Azure also supports scaling up by using larger role
instances instead of more role instances. By adding and removing role
instances to your Windows Azure application while it is running, you can
balance the performance of the application against its running costs. An
autoscaling solution reduces the amount of manual work involved in
dynamically scaling an application.

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What is Vm Role in Windows
Azure?

Virtual Machine (VM) roles, now in Beta, enable you to deploy a
custom Windows Server 2008 R2 (Enterprise or Standard) image to Windows
Azure. You can use the VM role when your application requires a large
number of server OS customizations and cannot be automated. The VM Role
gives you full control over your application environment and lets you
migrate existing applications to the cloud.

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Apart
from dotnet Framework please name other three language framework that
can be used to Develop Windows Azure Applications?

php, node.js, java

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How would you categorize
Windows Azure?

PaaS (Platform as a Service)

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What is Azure Cloud Service?

By creating a cloud service, you can deploy a multi-tier web
application in Azure, defining multiple roles to distribute processing
and allow flexible scaling of your application. A cloud service consists
of one or more web roles and/or worker roles, each with its own
application files and configuration. Azure Websites and Virtual Machines
also enable web applications on Azure. The main advantage of cloud
services is the ability to support more complex multi-tier
architectures

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What is Cloud Service Role?

A cloud service role is comprised of application files and a
configuration. A cloud service can have two types of role.

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To show your cloud service’s dependencies on other resources, such as
an Azure SQL Database instance, you can “link” the resource to the cloud
service. In the Preview Management Portal, you can view linked resources
on the Linked Resources page, view their status on the dashboard, and
scale a linked SQL Database instance along with the service roles on the
Scale page. Linking a resource in this sense does not connect the
resource to the application; you must configure the connections in the
application code.

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What is Scale Cloud Service?

A cloud service is scaled out by increasing the number of role
instances (virtual machines) deployed for a role. A cloud service is
scaled in by decreasing role instances. In the Preview Management
Portal, you can also scale a linked SQL Database instance, by changing
the SQL Database edition and the maximum database size, when you scale
your service roles.

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What is Web Role ?

A web role provides a dedicated Internet Information Services (IIS)
web-server used for hosting front-end web applications.

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What is Worker Role ?

Applications hosted within worker roles can run asynchronous,
long-running or perpetual tasks independent of user interaction or
input.

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What is Role Instance ?

A role instance is a virtual machine on which the application code
and role configuration run. A role can have multiple instances, defined
in the service configuration file.

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What is Guest Operating System
?

The guest operating system for a cloud service is the operating
system installed on the role instances (virtual machines) on which your
application code runs.

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What is Cloud Service
Components?

Three components are required in order to deploy an application as a
cloud service in Azure.

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What is Deployment
Environments?

Azure offers two deployment environments for cloud services: a
staging environment in which you can test your deployment before you
promote it to the production environment. The two environments are
distinguished only by the virtual IP addresses (VIPs) by which the cloud
service is accessed. In the staging environment, the cloud service’s
globally unique identifier (GUID) identifies it in URLs
(GUID.cloudapp.net). In the production environment, the URL is based on
the friendlier DNS prefix assigned to the cloud service (for example,
myservice.cloudapp.net).

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What is Swap Deployments?

To promote a deployment in the Azure staging environment to the
production environment, you can “swap” the deployments by switching the
VIPs by which the two deployments are accessed. After the deployment,
the DNS name for the cloud service points to the deployment that had
been in the staging environment.

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What is Minimal Vs
Verbose Monitoring?

Minimal monitoring, which is configured by default for a cloud
service, uses performance counters gathered from the host operating
systems for role instances (virtual machines). Verbose monitoring
gathers additional metrics based on performance data within the role
instances to enable closer analysis of issues that occur during
application processing.

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What is Service Definition
File?

The cloud service definition file (.csdef) defines the service model,
including the number of roles.

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What is Service
Configuration File?

The cloud service configuration file (.cscfg) provides configuration
settings for the cloud service and individual roles, including the
number of role instances.

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What is Service Package ?

The service package (.cspkg) contains the application code and the
service definition file.

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What is Cloud Service
Deployment ?

A cloud service deployment is an instance of a cloud service deployed
to the Azure staging or production environment. You can maintain
deployments in both staging and production.

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What is Azure Diagnostics ?

Azure Diagnostics is the API that enables you to collect diagnostic
data from applications running in Azure. Azure Diagnostics must be
enabled for cloud service roles in order for verbose monitoring to be
turned on. For more information.

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What is Azure Service
Level Agreement?

The Azure Compute SLA guarantees that, when you deploy two or more
role instances for every role, access to your cloud service will be
maintained at least 99.95 percent of the time. Also, detection and
corrective action will be initiated 99.9 percent of the time when a role
instance’s process is not running.

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