leejunkim

Cloud Computing

3 min read

What

It is the the on-demand delivery of IT resources over the Internet with pay-as-you-go pricing

  • Common cloud services: compute, networking, storage, databases
  • diagram
  • they own and operate IT resources & infrastructure in their own data centers, that are typically distributed across the entire world
  • as a customer, you can use the cloud infrastructure (rent/use IT resources managed by AWS) through cloud services!
  • No need to provision/maintain your own data center

Common Cloud Services

  • Compute
  • Networking
  • Storage
  • Databases

Types of Cloud computing

  • diagram

Without cloud computing

  • Advantages
    • Full control over your physical infrastructure & hardware
    • You know exactly where your computers (and data) are
  • Disadvantages
    • Your responsibility to maintain the infrastructure and protecting it
    • Your responsibility for long term capacity planning & upgrading
    • Can’t react quickly to workload spikes (ex. more requests)
    • Pay for idle resources
    • Typically stuck to one or a few locations

Cloud Advantages

  • Official source
  • Reliability
    • Rely on AWS
      • AWS operates & maintains the infrastructure (maintenance, capacity planning & upgrades, security)
      • Service Level Agreements (SLA) are available for many key services
    • Build reliable applications
      • Various services help you build reliable applications, correctly & consistently (no matter the circumstances)
      • Reliable to keep up with traffic or demand in general
    • Rely on AWS Global Reach
      • They have data centers all across the globe
      • Allows you to fall back to a different region or data center in case
      • You can move your workload within mins to hrs (not days/weeks)
  • Agility, Elasticity & Scalability
    • Agility
      • You can use cloud resources within seconds or minutes
      • You can configure and start a rented server on which you can install and run any software/workload of your choice in few clicks
      • Instant & easy
    • Elasticity
      • You can start using more/less resources whenever you need to VERY quickly
      • No long-term planning required
    • Scalability
      • Scale up or down as required
      • Use auto-scaling services to reduce manual workload
  • Pay-as-you go
    • Generally, you only pay for what you’re using
      • If you don’t use it, simply no payment!
    • No fixed cost! → You trade fixed expense for variable expense
    • No CapEx (capital expenditure) for purchasing/operating your own hardware
    • Less OpEx (operating expenditure) since you only pay for service usage, not staff/power
    • Benefit from AWS’ economies of scale
      • AWS can realize discounts & savings on hardware procurements (+ advantages) which you couldn’t
  • Global Reach & high availability
    • AWS own & operate a world-wide network of data centers
      • benefit with global reach
      • choose a perfect location
    • make available/faster to more customers worldwide for high availability

Cloud Architecture terms

  • Availability
  • Scalability
    • your ability to grow capacity rapidly or unimpeded
    • scaling up (vertical) - upgrading to bigger server
    • scaling out (horizontal scaling) - adding more servers of the same size
  • Elasticity
  • Fault tolerance
  • Disaster recovery

Graph View

Backlinks