Q. What is Cloud Computing?
A. Cloud Computing is term used to refer the use of computing resources (hardware and software) that are delivered
as a service over a network (typically the Internet).
Q. What are the Service Model in Cloud Computing?
A. 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. Source from : http://en.wikipedia.org/wiki/Cloud_computing
Q. How many types of deployment models are used in cloud?
A. There are 4 types of deployment models used in cloud:
Public cloud
Private cloud
Community cloud
Hybrid cloud
Q. What is Windows Azure Platform?
A. 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.
Q. What are the roles available in Windows Azure?
A. 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
Q. What is difference between Windows Azure Platform and Windows Azure?
A. 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 which is slightly modified version of Microsoft 2008 Server.
Q. What are the three main components of Windows Azure Platform?
A. Compute
Storage
AppFabric
Q. What is Windows Azure compute emulator?
A. 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.
Q. What is App fabric?
A. Azure AppFabric is a suite of middleware services and technologies to help you develop and manage services/applications that use Windows Azure. Middleware is typically defined as software that helps connect other pieces of software, and this definition is pretty accurate for the services appFabric provides.
You don't create an App Fabric per say. AppFabric services are used by your other applications as needed, so setup is typically configuring certain items in the Azure Portal, then implementing libraries of config entires in your web/worker roles that leverage the resources.
Essentially AppFabric provides certain resources that you need when composing complex applications as services, vs. you having to implement and maintain these resources yourself.
The basic offerings are:
Service Bus: A message relay that can be consumed by other .NET technologies (and others). SB helps you connect different cloud services as well as "hybrid" services. The hybrid is a big deal, as SB helps you easily connect on-premise web services with services you run in the cloud, w/o having to mess around with VPN, protocols, server setups, certificates, etc etc.
Access Control: An authentication and authorization service, helping you manage user-level access without having to extend/implement Active Directory, LDAP, and custom user authentication modules throughout Azure.
Caching: an in-memory distributed caching layer for your applications. This is typical to memcached or the Windows Server version of AppFabric
Integration: a PaaS service of EDI/transport technology like BizTalk server
Composite App: allows the composition of complex applications using a compistion language versus just putting a bunch of code together. You basically define your application using a designer like you would a EF.Net data model or a Windows Workflow
So basically AppFabric provides you with a lot of services that you likely need, but the typical cloud developer may not want to "mess with" at least at first. This way you have these great building blocks to help you focus on your core logic/needs during development cycles while not limiting what your application can ultimately do. This "focus" is one of the core benefits to cloud computing, especially Platform as a Service, and is one area where Azure really shines compared to other offerings.
Q. How many instances of a Role should be deployed to satisfy Azure SLA (service level agreement) ? And what's the benefit of Azure SLA?
A. TWO. And if we do so, the role would have external connectivity at least 99.95% of the time.
Q. What are the options to manage session state in Windows Azure?
A. Windows Azure Caching
SQL Azure
Azure Table
Q. What is cspack?
A. 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.
Q. What is csrun?
A. It is a command-line tool that deploys a packaged application to the Windows Azure compute emulator and manages the running service.
Q. What is guest OS?
A. It is the operating system that runs on the virtual machine that hosts an instance of a role.
Q. How to programmatically scale out Azure Worker Role instances?
A. Using AutoScaling Application Block
Q. What is the difference between Public Cloud and Private Cloud?
A. 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.
Q. What is windows Azure Diagnostics?
A. 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. http://www.windowsazure.com/en-us/develop/net/common-tasks/diagnostics/
Q. What is Blob?
A. 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
Q. What is the difference between Block Blob vs Page Blob?
A. Any file type can be stored in the Windows Azure BLOB Storage service, such as Image files, database files, text files, or virtual hard drive files. However, when they are uploaded to the service they are stored as either a Page BLOB or a Block BLOB depending on how you plan on using that file or the size of the file you need to work with.
Page BLOBs are optimized for random reads and writes so they are most commonly used when storing virtual hard drive files for virtual machines: In fact, the Page BLOB was introduced when the first virtual drive for Windows Azure was announced: the Windows Azure Cloud Drive (at the time they were known as Windows Azure X-Drives). Nowadays, the persisted disks used by Windows Azure Virtual Machine (Microsoft’s IaaS offering) also use the Page BLOB to store their data and Operating System drives. Each Page BLOB is made up of one or more 512-byte pages of data, up to a total size limit of 1 TB per file.
The majority of files that you upload would benefit from being stored as Block BLOBs, which are written to the storage account as a series of blocks and then committed into a single file. We can create a large file by breaking it into blocks, which can be uploaded concurrently and then then committed together into a single file in one operation. This provides us with faster upload times and better throughput. The client storage libraries manage this process by uploading files of less than 64 MB in size in a single operation, and uploading larger files across multiple operations by breaking down the files and running the concurrent uploads. A Block BLOB has a maximum size of 200 GB. For this article we will be using Block BLOBs in the examples.
Q. What is the difference between Windows Azure Queues and Windows Azure Service Bus Queues?
A. 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.
Q. What is DeadLetter queue?
A. 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.
Q. What is table storoage in Windows Azure?
A. 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.
A. Cloud Computing is term used to refer the use of computing resources (hardware and software) that are delivered
as a service over a network (typically the Internet).
Q. What are the Service Model in Cloud Computing?
A. 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. Source from : http://en.wikipedia.org/wiki/Cloud_computing
Q. How many types of deployment models are used in cloud?
A. There are 4 types of deployment models used in cloud:
Public cloud
Private cloud
Community cloud
Hybrid cloud
Q. What is Windows Azure Platform?
A. 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.
Q. What are the roles available in Windows Azure?
A. 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
Q. What is difference between Windows Azure Platform and Windows Azure?
A. 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 which is slightly modified version of Microsoft 2008 Server.
Q. What are the three main components of Windows Azure Platform?
A. Compute
Storage
AppFabric
Q. What is Windows Azure compute emulator?
A. 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.
Q. What is App fabric?
A. Azure AppFabric is a suite of middleware services and technologies to help you develop and manage services/applications that use Windows Azure. Middleware is typically defined as software that helps connect other pieces of software, and this definition is pretty accurate for the services appFabric provides.
You don't create an App Fabric per say. AppFabric services are used by your other applications as needed, so setup is typically configuring certain items in the Azure Portal, then implementing libraries of config entires in your web/worker roles that leverage the resources.
Essentially AppFabric provides certain resources that you need when composing complex applications as services, vs. you having to implement and maintain these resources yourself.
The basic offerings are:
Service Bus: A message relay that can be consumed by other .NET technologies (and others). SB helps you connect different cloud services as well as "hybrid" services. The hybrid is a big deal, as SB helps you easily connect on-premise web services with services you run in the cloud, w/o having to mess around with VPN, protocols, server setups, certificates, etc etc.
Access Control: An authentication and authorization service, helping you manage user-level access without having to extend/implement Active Directory, LDAP, and custom user authentication modules throughout Azure.
Caching: an in-memory distributed caching layer for your applications. This is typical to memcached or the Windows Server version of AppFabric
Integration: a PaaS service of EDI/transport technology like BizTalk server
Composite App: allows the composition of complex applications using a compistion language versus just putting a bunch of code together. You basically define your application using a designer like you would a EF.Net data model or a Windows Workflow
So basically AppFabric provides you with a lot of services that you likely need, but the typical cloud developer may not want to "mess with" at least at first. This way you have these great building blocks to help you focus on your core logic/needs during development cycles while not limiting what your application can ultimately do. This "focus" is one of the core benefits to cloud computing, especially Platform as a Service, and is one area where Azure really shines compared to other offerings.
Q. How many instances of a Role should be deployed to satisfy Azure SLA (service level agreement) ? And what's the benefit of Azure SLA?
A. TWO. And if we do so, the role would have external connectivity at least 99.95% of the time.
Q. What are the options to manage session state in Windows Azure?
A. Windows Azure Caching
SQL Azure
Azure Table
Q. What is cspack?
A. 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.
Q. What is csrun?
A. It is a command-line tool that deploys a packaged application to the Windows Azure compute emulator and manages the running service.
Q. What is guest OS?
A. It is the operating system that runs on the virtual machine that hosts an instance of a role.
Q. How to programmatically scale out Azure Worker Role instances?
A. Using AutoScaling Application Block
Q. What is the difference between Public Cloud and Private Cloud?
A. 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.
Q. What is windows Azure Diagnostics?
A. 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. http://www.windowsazure.com/en-us/develop/net/common-tasks/diagnostics/
Q. What is Blob?
A. 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
Q. What is the difference between Block Blob vs Page Blob?
A. Any file type can be stored in the Windows Azure BLOB Storage service, such as Image files, database files, text files, or virtual hard drive files. However, when they are uploaded to the service they are stored as either a Page BLOB or a Block BLOB depending on how you plan on using that file or the size of the file you need to work with.
Page BLOBs are optimized for random reads and writes so they are most commonly used when storing virtual hard drive files for virtual machines: In fact, the Page BLOB was introduced when the first virtual drive for Windows Azure was announced: the Windows Azure Cloud Drive (at the time they were known as Windows Azure X-Drives). Nowadays, the persisted disks used by Windows Azure Virtual Machine (Microsoft’s IaaS offering) also use the Page BLOB to store their data and Operating System drives. Each Page BLOB is made up of one or more 512-byte pages of data, up to a total size limit of 1 TB per file.
The majority of files that you upload would benefit from being stored as Block BLOBs, which are written to the storage account as a series of blocks and then committed into a single file. We can create a large file by breaking it into blocks, which can be uploaded concurrently and then then committed together into a single file in one operation. This provides us with faster upload times and better throughput. The client storage libraries manage this process by uploading files of less than 64 MB in size in a single operation, and uploading larger files across multiple operations by breaking down the files and running the concurrent uploads. A Block BLOB has a maximum size of 200 GB. For this article we will be using Block BLOBs in the examples.
Q. What is the difference between Windows Azure Queues and Windows Azure Service Bus Queues?
A. 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.
Q. What is DeadLetter queue?
A. 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.
Q. What is table storoage in Windows Azure?
A. 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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