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2. It offers web and worker roles that can scale horizontally by replicating instances as needed to handle increasing load. Storage services allow scaling to store large amounts of data cost-effectively.
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Cloud computing is a model for enabling ubiquitous, convenient, on-demand network access to a shared pool of configurable computing resources that can be rapidly provisioned and released with minimal management effort or service provider interaction. Key characteristics of cloud computing include on-demand self-service, broad network access, resource pooling, rapid elasticity, and measured service. Cloud computing provides services at various levels including SaaS, PaaS and IaaS. The main advantages of cloud computing are lower costs, flexibility and scalability.
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This presentation covers both the Cloud Foundry Elastic Runtime (known by many as just "Cloud Foundry") as well as the Operations Manager (known by many as BOSH). For each, the main components are covered with interactions between them.
Cloud Foundry is a platform as a service that provides structure and opinions for software deployment. It uses BOSH to automate infrastructure provisioning and deployment. Applications are deployed through buildpacks that combine code with dependencies. Services can also be provisioned through service brokers and bound to applications. Logging and routing are standardized through components like Loggregator and the router.
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3. 3
Add text title Add text title
Arnon Rotem Gal-Oz has more
than 20 years of experience
managing, architecting and
developing large scale, mission
critical, distributed systems. Before
joining CodeValue as VP product
management, Arnon worked as VP R&D for
xsights, a visual search SaaS provider. Prior
to that, he worked in various technical and
managerial roles in large corporations
including Microsoft, Amdocs and Matrix.
Arnon published articles for various online
and printed journals such as
InfoQ, Dr. Dobb’s and MSDN.
Alon Fliess got his BSc degree in
electrical & computer
engineering from the Technion,
the Israel Institute of
Technology. Alon recognized as a Microsoft
Regional Director (MRD) as well as Microsoft
MVP. Alon is an expert in many Microsoft
technologies, be it Windows internals, C++
Win32 programming, .NET with C# or
C++/CLI. Alon is the co-author of the
Introducing Windows 7 for Developers
book. Alon gives lectures in conferences
worldwide.
4. 4
Agenda
• Hello Azure Application
• Introduction to Cloud Computing
• The Building Blocks of Azure
• Web Role, Worker Role & VM Role
• Service Bus, Queues & Access Control
• Azure Storage – Table Storage, Queue & SQL
Azure
• Architecting Cloud Applications
• Porting to the cloud
6. 6
Cloud Computing
A Game Changing Technology
• Location independent computing
• Shared servers resources, software, and data
• Elasticity
• Total Cost of Operation
• Natural evolution of:
– Virtualization
– Service-Oriented Architecture
– Utility computing
• Details are abstracted from consumers
7. Cloud Fundamentals
• 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, Amazon
• Software as a Service (SaaS): cloud applications
– On-demand applications
– E.g. GMail, Microsoft Office Web Companions
8. The Benefits of the Cloud
• The Cloud is about cheap, on-demand capacity
= Managed for
You
Standal
one
Servers
IaaS PaaS SaaS
Applications
Runtimes
Database
Operating System
Virtualization
Server
Storage
Networking
10. 10
Windows Azure
• Platform as a Service
– Application Platform in the Cloud
• Provides:
– Compute
• Web, Worker & VM Role
– Storage
• Blob, Table, Queue & Azure SQL Server
– Application Fabric
• Service Bus, Access Control, (Future: Cache,
Integration & Composite)
12. 12
Windows Azure
• Windows Azure is an OS for the data center
– Model: Treat the data center as a machine
– Handles resource management, provisioning, and monitoring
– Manages application lifecycle
– Allows developers to concentrate on business logic
• Provides shared pool of compute, disk and network
– Virtualized storage, compute and network
– Illusion of boundless resources
• Provides common building blocks for distributed applications
– Reliable queuing, simple structured storage, SQL storage
– Application services like access control and connectivity
13. Windows Azure Components
Windows Azure PaaS
Applications Windows Azure Service Model
Runtimes .NET 3.5/4, ASP .NET, PHP
Operating System Windows Server 2008/R2-Compatible OS
Virtualization Windows Azure Hypervisor
Server Microsoft Blades
Database SQL Azure
Storage Windows Azure Storage (Blob, Queue,
Table)
Networking Windows Azure-Configured Networking
14. 14
Modeling Cloud Applications
• A cloud application is typically made up of different
components
– Front end: e.g. load-balanced stateless web servers
– Middle worker tier: e.g. order processing, encoding
– Backend storage: e.g. SQL tables or files
– Multiple instances of each for scalability and availability
15. 15
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
• There are currently three role types:
– Web Role: IIS7 and ASP.NET in Windows Azure-supplied OS
– Worker Role: arbitrary code in Windows Azure-supplied OS
– VM Role: uploaded VHD with customer-supplied OS
16. Role Contents
• Definition:
– Role name
– Role type
– VM size (e.g. small, medium, etc.)
– Network endpoints
• Code:
– Web/Worker Role: Hosted DLL
and other executables
– VM Role: VHD
• Configuration:
– Number of instances
– Number of update and fault domains
17. Service Model Files
• Service definition is in
ServiceDefinition.csdef
• Service configuration is in
ServiceConfiguration.cscfg
• CSPack program Zips
service binaries and
definition into service
package file (service.cscfg)
18. Availability: Update Domains
• Purpose: Ensure service stays up
while updating and Windows Azure
OS updates
• System considers update domains
when upgrading a service
– Update domains/Instance count =
percent of service that will be offline
– Default and max is 5, but you can
override with upgradeDomainCount
service definition element
• The Windows Azure SLA is based on
at least two update domains and two
role instances in each role
19. 19
Availability: Fault Domains
• Purpose: Avoid single points of
failures
– Similar concept to update domains
– But you don’t control the updates
• Unit of failure based on data center
topology
– E.g. top-of-rack switch on a rack of
machines
• Windows Azure considers fault
domains when allocating service roles
– E.g. don’t put all roles in same rack
20. Deploying a Service
The 10,000 foot view
• Service package uploaded to portal
– Windows Azure Portal Service passes
service package to “Red Dog Front
End” (RDFE) Azure service
– RDFE converts service package to
native “RD” version
• RDFE sends service to Fabric
Controller (FC) based on target
region
• FC stores image in repository and
deploys and activates service
21. 21
The Fabric Controller (FC)
• The “kernel” of the cloud operating system
– Manages datacenter hardware
– Manages Windows Azure services
• Four main responsibilities:
– Datacenter resource allocation
– Datacenter resource
provisioning
– Service lifecycle management
– Service health management
• Inputs:
– Description of the hardware and network resources it will control
– Service model and binaries for cloud applications
22. 22
Datacenter Architecture
Node
s
TOR
LB LB
Agg
PDU
LB LB
Agg
LB LB
Agg
LB LB
Agg
LB LB
Agg
LB LB
Agg
Racks
Datacenter
Routers
Aggregation
Routers and
Load Balancers
Node
s
TOR
PDU
Node
s
TOR
PDU
Node
s
TOR
PDU
Node
s
TOR
PDU
Node
s
TOR
PDU
Node
s
TOR
PDU
Node
s
TOR
PDU
Node
s
TOR
PDU
Node
s
TOR
PDU
Node
s
TOR
PDU
Node
s
TOR
PDU
Node
s
TOR
PDU
Node
s
TOR
PDU
Node
s
TOR
PDU
…
… …
… … …
Top of Rack
Switches
Power Distribution
Units
24. 24
Inside a Role VM
Resource Volume
OS Volume
Role Volume
Guest Agent
Role Host
Role Entry Point
25. 25
Update Types
• There are two update types:
– In-place update:
• Supports changes to configuration or
binaries, not service definition
• Role instances upgraded one update
domain at a time
• Two modes: automatic and manual
– VIP swap update:
• Service definition can change, but
external endpoints must remain the same
• New version of service deployed, external
VIP/DIP mapping swapped with old
• Changes to external endpoint count require a
new deployment
26. 26
Node and Role Health Maintenance
• FC maintains service availability by monitoring the
software and hardware health
– Based primarily on heartbeats
– Automatically “heals” affected roles
Problem How Detected Fabric Response
Role instance crashes FC guest agent monitors role termination FC restarts role
Guest VM or agent crashes FC host agent notices missing guest agent
heartbeats
FC restarts VM and hosted role
Host OS or agent crashes FC notices missing host agent heartbeat Tries to recover node
FC reallocates roles to other nodes
Detected node hardware
issue
Host agent informs FC FC migrates roles to other nodes
Marks node “out for repair”
27. 27
Azure Architecture Summary
• Platform as a Service is all about reducing
management and operations overhead
• The Windows Azure Fabric Controller is the
foundation for Windows Azure’s PaaS
– Provisions machines
– Deploys services
– Configures hardware for services
– Monitors service and hardware health
– Performs service healing