(aka cloud service delivery model)
At a Glance
specific, pre-packaged combination of IT resources offered by a cloud provider
in terms of customizability and level of control/access granted, IaaS > PaaS > SaaS mnemonic - I P S
in terms of ready-to-use, SaaS > PaaS > IaaS
Cloud Service Delivery Models
IaaS - Infrastructure as a Service
Resources, self-contained IT environment hardware, network, connectivity are all provided by cloud provider bare infrastructure “bare metal”
generally offered as virtual instances
access = full access to virtualized infrastructure related IT resources
cloud consumer - sets up and configures bare infrastructure, manages, monitors software
cloud provider - provides and manages IT resources like storage, processing, hosting, networking. monitors usage
offers as much configurability and customizability as on-premise tech virtual servers
eg. ec2
PaaS - Platform as a Service
ready made environment support the entire device lifecycle provides a framework
allows customers to build, test, deploy run, update and scale applications more quickly and cost-effectively than they could if they had to build out and manage their own on-premises platform
access - moderate level of administrative control limited administrative
cloud consumer - develops, tests, deploys, and manages
cloud provider - pre-configures infrastructure, middleware. monitors usage
eg Heroku
SaaS - Software as a Service
software that is a shared cloud service used to make a reusable cloud service widely available mostly for end users
access = front-end user-interface
cloud consumer - uses and configures cloud service
cloud provider - implements and manages cloud service
eg. Gmail, Microsoft 365,
Pizza Analogy
- on-premise → your own kitchen, your own ingredients, any type of pizza
- IaaS → (kitchen as a service) → cloud provider manages kitchen, your own ingredients, any type of pizza
- PaaS → (take and bake) → cloud provider manages kitchen and some ingredients, your own pizza but with limited ingredients
- SaaS → (pizza delivery) → cloud provider manages kitchen, ingredients, and pizza making. You can choose from available options
Ease of use vs Customizability
Doubts
netlify - saas, paas? cdn