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NETE4631 Amazon Cloud Offerings


Amazon EC2 Pricing * Amazon EC2 * EC2 Commands Build your own image Launch a virtual server instance based on your machine image * EC2 Commands (2) Allocate ... – PowerPoint PPT presentation

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Title: NETE4631 Amazon Cloud Offerings

NETE4631Amazon Cloud Offerings
  • Lecture Notes 6

Cloud Deployment Models - Recap
  • Public clouds
  • Private clouds
  • Hybrid clouds

The models by the US National institute of
standards and technology (NIST)
Moving applications to the cloud Recap(2)
  • Deploy Application to the cloud?
  • Entirely or Part of the application is on the
    local system and another part is in the cloud
  • Migration involves
  • Functionality Mapping
  • Analysis of critical features of application
  • -------------- where to deploy the
  • Analysis of features supported by cloud provider
  • Nature of target cloud platform
  • Evaluation of supported tools and technologies

Examples Recap (3)
  • Medical imaging system
  • Reservation system

Lecture Outline
  • Amazon Web Services
  • Amazon EC2
  • Amazon Storage
  • Amazon Simple Storage System (S3)
  • Amazon Elastic Block Store (EBS)
  • Amazon CloudFront
  • Amazon Database
  • Amazon SimpleDB
  • Amazon Relational Database Service (RDS)
  • Amazon Virtual Private Cloud
  • Amazon CloudWatch
  • Amazon Elastic Load Balancing
  • Service Levels for Cloud Applications

Amazon Web Services
Amazon Cloud Offerings
AWS Management Console
Amazon Elastic Compute Cloud(EC2)
  • EC2 is a virtual server platform that allows
    users to create (launch) and run virtual machines
    on Amazons server farm.
  • Run server instances on Xen virtualization
    hypervisor based on Amazon Machine Images (AMIs)
    running different OSs and performance profiles
  • Provides support for multiple flavors of Linux
    and Windows.
  • Preconfigured template images
  • Complete control of instances and customization
  • Resizable computing facility in the cloud.
  • Cluster, replicate load balance and locate your
    servers in different data centers to provide
    fault torelance
  • Support for start, terminate and monitor as many
    instances as needed

Components that support EC2
System images and software
  • Red Hat Enterprise/ OpenSuse/ Ubuntu Linux.
  • OpenSolaris, Fedora, Debian.
  • Windows Server 2003/2008 32-bit and 64-bit.

Amazon EC2 Pricing
Amazon EC2
EC2 Commands
  • Build your own image
  • Launch a virtual server instance based on your
    machine image

EC2 Commands (2)
  • Allocate new elastic IP address
  • Assign it to your EC2 instance
  • List all your allocated addresses

Amazon Storage
  • Amazon Simple Storage System (S3)
  • Online backup and storage system.
  • Storage containers are referred to as buckets.
  • Low bandwidth access but guarantee.
  • Amazon Elastic Block Store (EBS)
  • Crete virtual disks (volume).
  • Performance and reliable than S3.
  • Amazon CloudFront
  • Content-delivery system (edge computing) that
    caches data in different physical locations.

EC2 Storage Type Properties
Amazon Simple Storage Service (S3)
S3 Commands
  • Create a bucket
  • Put something inside a bucket
  • Get the object out of the cloud
  • Others list (ls) and delete (del) a bucket or
    an object

EBS Commands
  • Create EBS volume
  • Attach it into the instance in the same
    availability zone
  • You can mount or format at any time

Amazon CloudFront
Amazon Database
  • Amazon SimpleDB
  • Simple indexing and data queries, -gt
    non-relational and joins are not supported.
  • Not a full database implementation.
  • Amazon Relational Database Service (RDS)
  • Allow users to create instance of commercial
    database such as MySQL.
  • Support portability features.
  • Automated software patching, database backups,
    and automated database scaling.

Amazon SimpleDB
Amazon VPC
  • Provides a virtual isolated section on Amazon Web
    Services cloud.
  • Provides support for both software and hardware
    virtual private network.
  • Provides security features such as groups and
    network access control lists.

Amazon CloudWatch
  • Provides monitors for AWS cloud resources.
  • Custom metrics support.
  • Alarms to take automated action when metric
    crosses specified threshold.
  • Visual support of metrics in form of graphs and
    statistical tables.

Elastic Load Balancing
  • Automatically distribute incoming application
    traffic across multiple Amazon EC2 instances.
  • Can detect health of EC2 instances and route
    traffic accordingly.
  • Elastic balancing support for cloud watch metrics.

Service Levels for Cloud Apps
  • Service Level Agreement (SLA) identifies key
    metrics (service levels) that the customer can
    reasonably expect from the service.
  • Availability
  • Reliability
  • Performance

  • Describes how often a service can be used over a
    defined period of time.
  • For example, if a website is accessible t the
    general public for 710 hours out of a 720 hours
    month, we say it has a 98.6 availability rating
    for that month
  • High availability for most people can be 99.99
    to 99.999 availability

Availability (2)
  • How to estimate the availability of your system
    involves 2 variables
  • The likelihood you will encounter a failure in
    the system during the measurement period
  • How much downtime you would expect in the event
    the system fails
  • The mathematic formulation of the availability of
    a component is

Availability (3)
  • Example
  • Your 486 has 40 chance of failure and you will
    down for 24 hours, your 486 uptime is
  • (8746 (40x24))/8746) 99.9
  • Also, if you cable provider generally experiences
    2 outages each year lasting 2 months each
  • (8746 (40x24) (200x2))/8746 99.84

Availability (4)
  • two 486 boxes that have 40 chance of failure and
    they will down for 24 hours each, the uptime is

Amazon Web Service SLAs
  • Amazon S3
  • Promise 99.5 of the time in each calendar month
    to response to service requests
  • Amazon EC2
  • Promise 99.95 availability of at least 2
    availability zones within a region

Expected Availability in the Cloud
  • Key differentiator between downtime in the cloud
    and downtime in a physical environments is
  • How much easier it is to create an infrastructure
    that will recover rapidly when something negative
  • Redundancies that span data centers
  • More quickly recover when a downtime occurs

Availability Comparison
  • Example one single load balancer. Two
    application servers and a database engine
  • Physical environments
  • Cloud

From the example
  • EC2 instances are much less stable than physical
  • The reliance on multiple availability zones can
    significantly mitigate the lack of stability in
    EC2 instances.
  • The lack of stability of a software load balancer
    is largely irrelevant thanks to the ability to
    quickly and automatically replace it.

  • Refers to how well you can trust a system to
    protect data integrity and execute its
  • System that is frequently not available is
    clearly not reliable.
  • A highly available system, however, can still be
    unreliable if you dont trust the data it

  • Design your application so logic can be spread
    across multiple servers.
  • Leverage threading and/ or process forking
  • Depending on the nature of applications example
    of transactional applications
  • Clustering your database
  • Segment database access so database reads can run
    against slave while writes execute against the

EC2 Performance
  • EC2 System performs well
  • Network speeds are quite outstanding
  • Storage
  • S3 is very slow
  • Local storage is entirely unpredictable
  • Block storage has exactly the kind of performance
    you would expect for SAN

Risks of data privacy
  • You never know where your data is when its in
    the cloud.
  • Your data lies within a Xen virtual machine guest
    OS or EBS volume
  • Network traffic exchanging data between instances
    is not visible to other virtual hosts
  • S3 storage lies in a public namespace but
    accessible in private
  • Amazon zeros out all local storage between uses
  • Snapshots are probably reasonably secure

  • Chapter 2-3, Cloud Application Architectures,
    building applications and infrastructure in the
    cloud, OReilly, Reese, G., 2009
  • Chapter 9 of Course Book Cloud Computing Bible,
    2011, Wiley Publishing Inc.
  • http//