Cloud computing Azure
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This document provides an overview of cloud computing concepts including definitions of cloud computing, characteristics of cloud computing like pay per use and reduced costs, and common objections around security and control. It then defines common cloud service models like Infrastructure as a Service (IaaS), Platform as a Service (PaaS), and Software as a Service (SaaS) as well as deployment models like private, public and hybrid clouds. The rest of the document focuses on the Microsoft Azure cloud platform, describing its architecture and services like compute, storage, SQL databases and networking capabilities.
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Cloud computing Azure
- 2. Agenda • Cloud Computing Fundamentals • Microsoft Azure
- 3. What is the Cloud? • "Cloud computing is a model for enabling convenient, on-demand network access to a shared pool of configurable computing resources (e.g., networks, servers, storage, applications, and services) that can be rapidly provisioned and released with minimal management effort or service provider interaction. This cloud model promotes availability.
- 4. Characteristics Top five advantages of cloud computing: •Pay only for what you use •Easy/fast deployment to end users •Monthly payments •Encourages standard systems •Requires less in-house staff, costs
- 5. Chief Objections to the Cloud • Compliance Issues • Security • Control
- 7. Defining the Cloud Service ModelsDeployment Models Infrastructure as a Service (IaaS) Platform as a Service PaaS Software as a Service SaaS Private Cloud Public Cloud Hybrid Cloud
- 11. Cloud Terminology • Infrastructure as a Service (IaaS): basic compute and storage resources – On-demand servers – Amazon EC2, VMWare vCloud • Platform as a Service (PaaS): cloud application infrastructure – On-demand application-hosting environment – E.g. Google AppEngine, Salesforce.com, Windows Azure • Software as a Service (SaaS): cloud applications – On-demand applications – E.g. Office 365, GMail, Microsoft Office Web Companions
- 12. Cloud Computing Taxonomy Higher Cost & More Control Lower Cost & Higher Agility
- 13. 2) Choose image, then create and configure VM(s) for application 1) Choose image, then create VM for DBMS and configure DBMS Library VM Images IaaS Developer Application Data Load Balancer 5) Configu re load balance r 6) Manage VMs and DBMS (e.g., deploying new OS images in VMs) 3) Provision database, then create tables and add data 4) Install applicat ion
- 14. PaaS Developer Application Data Load Balancer 2) Deploy applicatio n 1) Provision database, then create tables and add data
- 15. Microsoft Azure Platform Windows Azure Networking “Red Dog” Front End (RDFE)
- 18. Cloud Services
- 20. The Windows Azure Service Model • A Windows Azure application is called a “service” – Definition information – Configuration information – At least one “role” • Roles are like DLLs in the service “process” – Collection of code with an entry point that runs in its own virtual machine • Windows Azure compute SLA requires two instances of each role – 99.95% for connectivity to two instances – Achieved with update and fault domains
- 21. Windows Azure Storage Fundamentals • Storage characteristics – Durable – replicated three times – Scalable (capacity and throughput) – Highly available • Simple and familiar programming interfaces – REST (HTTP and HTTPS) – .NET accessible
- 22. Blobs Provide a simple interface for storing named files along with metadata for the file Tables Provide lightly structured storage with a set of entities that contain a set of properties Queues Provide reliable storage and delivery of messages Storage Objects
- 23. Storage Account and Blob Containers • Storage account – An account can have many blob containers • Container – A container is a set of blobs – Sharing policies are set at the container level • Public READ or Private – Associate metadata with container • Metadata is <name, value> pairs • Up to 8KB per container – List the blobs in a container
- 25. Table Data Model • Table – A storage account can create many tables – .NET classes and LINQ • A table is a set of entities (rows) – An entity is a set of properties (columns) – Billions of entities and TBs of data • Two “key” properties that together are the unique ID of the entity in the table – PartitionKey – enables scalability – RowKey – uniquely identifies the entity within the partition
- 26. Table Storage Concepts EntityTableAccount sally users Name =… Email = … Name =… Email = … photo index Photo ID =… Date =… Photo ID =… Date =…
- 27. Windows Azure Queues • Provide reliable message delivery – Simple, asynchronous work dispatch – Programming semantics ensure that a message can be processed at least once • Queues are highly available, durable and performance efficient – Maximum size is 64K – FIFO in general, but not guaranteed • Pulling an item from the queue doesn’t delete it – It becomes invisible for a visibility timeout – Item must be deleted before timeout or else it becomes visible
- 28. Queue Storage Concepts MessageQueueAccount sally thumbnail jobs 128x128, http://… 256x256, http://… photo processing jobs http://… http://…
- 29. Account Container Blobs Table Entities Queue Messages Windows Azure Data Storage Concepts http://<account>.blob.core.windows.net/<container> http://<account>.table.core.windows.net/<table> http://<account>.queue.core.windows.net/<queue>
- 30. SQL Database
- 31. SQL Database Details • Cloud relational database based on SQL Server engine • Use same tools, data access frameworks, T-SQL based language • Global datacenters • High Availability and Redundancy – Reads are completed at the primary – Writes are replicated to a quorum of secondaries
- 32. SQL Database vs SQL Server Horizontal Scaling SQL Server Authentication Only Not all T-SQL Commands Supported No SSIS SQL Azure Requires Clustered Indexes SQL Azure Lacks Access to System Tables SQL Azure Requires SQL Server Management Studio 2008 R2 SQL Azure Doesn't Support Database Mirroring or Failover Clustering No SQL Azure Support for Analysis Services, Replication, Reporting Services, or SQL Server Service Broker SQL Azure Offers No SQL CLR Support SQL Azure Doesn't Support Backup and Restore