Cloud 101 - Federation of Earth Science Information …commons.esipfed.org/sites/default/files/Intro...
Transcript of Cloud 101 - Federation of Earth Science Information …commons.esipfed.org/sites/default/files/Intro...
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Cloud 101
Mike Gangl, Caltech/JPL, [email protected]
© 2015 California Institute of Technology. Government sponsorship acknowledged
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Outline
• What is cloud computing?
• Cloud service models
• Deployment models
• Storage
• Use cases
• Economics
• Caveats and issues
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What is cloud computing?
• Cloud computing is a model for enabling
ubiquitous, 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. –NIST
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What is cloud computing?
• Key Features: – On-demand self service
– Broad network access
– Resource pooling
– Rapid elasticity
– Measured service
• It is not: – Just like mainframes
– Just server virtualization
– Just a really, really big cluster
– A panacea
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What is cloud computing?
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Service Models
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Cloud Services Models
• Clouds offer three models of service:
– Software-as-a-Service (SaaS)
– Platform-as-a-Service (PaaS)
– Infrastructure-as-a-Service (IaaS)
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©Rackspace
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Cloud Service Models
• Software-as-a-Service
– Application deployed over the internet
– Most visible to end users
– Great for large user bases or burst usage
• Gmail, flickr, Dropbox
• Burst usage examples:
– TurboTax: Busiest from January to April
– CBS: NCAA March Madness Streaming
– JPL: MSL Landing
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Cloud Service Models
• Platform-as-a-Service
– Suite of services to create web applications
quickly
– Infrastructure and software is provided
• Databases, user information/authentication,
messaging, load balancing, scalability
– Targets software development
– Examples
• Google App Engine
• AWS Elastic Beanstalk
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Cloud Service Models
• Infrastructure-as-a-Service
– Users allocate resources, often virtualized, such as servers, network, IP address and disk space
– Variable cost based on size/capacity of resources
– Allocation can be on-demand, reserved, or ‘spot’ instance pricing.
– Replaces the need of buying hardware. Easily “upgradeable”.
– Examples • Amazon Web Services
• Rackspace
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Deployment Models
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Deployment models
• Deployment depends on:
– Sensitivity of data/software
– Use case being addressed
– Costs
• Cloud deployments come in 4 models
– Private
– Public
– Hybrid
– Community
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Cloud Deployment Models
• Private Cloud
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Cloud Deployment Models
• Private Cloud – Cloud infrastructure usually managed locally (intranet vs internet)
– Resources are not shared outside of the cloud owner
– Useful when security is the key issue:
• Access within local firewalls or through secure VPN
• SOX, HIPPA, trade secrets
– Or based on other needs
• Public cloud SLAs aren’t guaranteeing enough
– Beware:
• Cloud technology companies are here today, gone tomorrow
• Upgrading cloud stacks (Openstack, Eucalyptus) is not trivial
• Users don’t like downtime
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Cloud Deployment Models
• Public Cloud
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Cloud Deployment Models
• Public Cloud – Cloud infrastructure provided by third party;
Quintessential cloud (internet vs intranet)
– Provider hosts multiple clients
– Useful for many applications: • Provide SAAS applications
• Handle load spikes
• Test out server/hardware architectures without large capital investments
– Examples: • Amazon
• Rackspace
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Cloud Deployment Models
• Hybrid Cloud
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Cloud Deployment Models
• Hybrid Cloud
– “Best of both worlds” model
– On premise cloud for normal load and functionality to reduce nominal cost
– “cloud bursting” to public cloud to handle large demands spikes
– Needs manual or automatic orchestration
– Examples • Microsoft Azure
• (Sales)Force.com PAAS
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Cloud Deployment Models
• Community Cloud
– “private cloud”++
– Jointly owned private cloud by groups with
similar compliance and policy considerations
– Examples
• Local first response agencies might share a cloud
that handles route, hospital and population
information instead of creating their own
• ESDIS cloud for all DAACs to use
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Storage
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Storage
• Storage in the cloud has different
properties
– Instance Storage
– Volume Storage
– Object Storage
• Public clouds generally make you pay for
storage and download costs, not input cost
• Storage has differing speeds of access
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Storage
• Instance Storage
– Disk space that comes with procured instances
– Exists only for the life of the instance!!!
– Free with instance pricing
• Volume (Block) Storage
– Most like a traditional hard drive
– Amazon EBS, Rackspace CBS, Open stack ‘Block Storage’, Eucalyptus volumes)
– Can be attached to different instances, but only one at a time
– Data persists on the device even when not in use
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Storage
• Object Storage
– Network accessible persistent storage
(usually http/ReST)
– Amazon S3, Rackspace Cloud Files,
Eucalyptus Buckets, OpenStack Object store
– Scalability and redundancy built in
– Private and/or public access
– Economy of scale cost savings
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Storage
• Object Storage Continued
– Some providers have multiple tiers (AWS and
Google most notably)
– Normal Object Storage ( $.03/GB example
only)
– Reduced Redundancy ( $.024/GB)
• Make sure you know what is meant by redundancy
– Archive Storage ($.01/GB)
• Long access times (up to 4 hours!)
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Storage
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Instance
Storage
Volume/Block
Storage
Object Storage
Speed High Medium/High Medium/Low
Redundancy
No No Yes
Chance of data
loss
High* low low
Cost Free** High Low
Scalable No No Yes
* All data in instance store is lost when the instance crashes, dies, or is terminated
** usually this comes free with each instance, but amount of space varies
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Use Cases
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Use cases
• What are common use cases for the
cloud?
– Mitigating load spikes
– Scalability
– Batch processing
– Data Locality
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Use cases
• Load Spikes & Scalability
– Websites and Content distribution • Load balancers in front of expandable bank of ‘servers’
• Many “cloud” technologies (e.g. NoSQL databases) come easy-to-scale as data volume increases
• TurboTax
– Storage Capacity • “infinite” storage, pay
as usage increases
• Allow “unlimited” download bandwidth
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Use cases
• Batch Processing
– Provision hardware for one-off processing
– Save results back on institutional hardware
– Examples
• Backfilling Metadata or running analysis on millions
of files might take months. Trade $ for time and
have it done in days.
• CPU Intensive tasks; e.g. data mining
• Large Map/Reduce frameworks jobs
• eHarmony & your perfect match
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Use cases
• Data Locality
– Data volume is expanding, users can no
longer have the entire dataset on their own
machine or even a single server
– Bring the processing to the data!
• Store all data on cloud storage
• Have users pay for instances (local to the data) to
do their work
• Provide tools in the environment to assist users
(search, visualize, datamine)
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Use Cases
• Dealing with heavy loads (Reprocessing)
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Use Cases
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• Data-as-a-Service
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Cloud Economics
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Economics
• Where “We can do that?” meets “It’s going to cost how much?”
• Take advantage of economies of scale
• Cloud economics inherently tricky:
– Can’t look only at capital costs • Admins
• Facility charges (power, cooling)?
• Redundancy
• Failure scenarios
• We will focus mainly on public clouds
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Economics
• Instances and servers – On demand pricing (Pay as you go)
• Pay more for better hardware
• $1.20/hour/instance
– Reserve pricing • Flat reservation fee + lower hourly
• Pay for a collection of resources up front, use and deploy however you’d like
– Spot pricing • Bid on pricing instances
• If “rate” falls below your bid, your instances start. They stop when the rates exceed bid
• Good for non-timely processing
• Storage/Object Stores – Pay per GB sometimes in, always out
– Bulk storage “discounts”
– Different Storage Tiers
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Economics
• Other costing
– Some providers aren’t as flexible as Amazon
or Rackspace
• Monthly pricing for a set allocation of resources
• Use it or lose it
– Bare metal clouds
• More expensive, but more predictable performance
– Who needs SAs?
• I do.
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Economics
• S3 costs
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Issues and Caveats
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Caveats
• All those cool services being offered…
– Quickly allow you to build scalable apps
– Lock you in to their custom tools and APIs
• Unchecked, costs can become a huge
issue
– Your datasets become extremely popular and
users are downloading terabytes each day…
you’re paying for that!
– Not using the XL1.xlarge instance to it’s
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Caveats
• Developer paradigm shifts
– Must refactor programs and applications to scale
– Plan for failures
– NIH*. Does. Not. Work.
• The Promised Land
– Cloud orchestration and dynamic scalability aren’t always easy
– One touch solutions will vary from provider to provider
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*Not Invented Here
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Questions?
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jp l .nasa.gov
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Backup Slides
• Useful links – Understanding the Cloud Computing stak (IaaS, PaaS, SaaS) by
Rackspace
– http://aws.amazon.com/architecture/
– http://www.ibm.com/cloud-computing/in/en/what-is-cloud-computing.html
– http://csrc.nist.gov/publications/nistpubs/800-145/SP800-145.pdf [NIST
Definition]
– http://aws.amazon.com/s3/pricing/
– http://aws.amazon.com/ec2/pricing/
– http://www.rackspace.com/en-us/cloud/public-pricing
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Reference herein to any specific commercial product, process, or service by trade name, trademark,
manufacturer, or otherwise, does not constitute or imply its endorsement by the United States
Government or the Jet Propulsion Laboratory, California Institute of Technology.