01. Introduction

access to IT services

over the internet

IT as a service

ITaaS

expand traditional e-commerce in the internet

to it structures

-> rent from virtual storefront the basic necessities to build a virtual datacenter

resources

• e.g. CPU, memory, storage, networking…

services

• application servers, databases, authentification, messaging,…

applications

• ISVs (independend software vendor / publisher) or self-developed

capital:

• pay-per-use -> no capital investment necessary

scalability:

• dynamically adapt resources to your needs

profit from economy of scale

enable environmental sustainablity

• backing data center can be optimized for efficient utilization

• can be built at appropriate places (e.g. green energy, free cooling,…)

Infrastructure as a Service (IaaS)

Platform as a Service (PaaS)

Software as a Service (SaaS)

servers

storage

networking

commodity hardware

• OTS, regular hardware

virtualization of servers, storage and networks

server template technology binding hardware and OS together

• i.e. linux based VM with certain applicatoin packages… -> instantiated on VM

Automated management of the infrastructure enabling self-service of costumers

• dynamic provisioning of physical resources

• management of virtual resources

• optimizatiuon of utilization, power efficiency

• high reliability and guaranteeing SLAs

application infrastructure services

• managed services:

  • databases

  • execution environments,

  • integrated development platforms

serverless computing

service oriented architecture

backend services that can be used in your application

scalable application middleware

containerizuation and conainer orchestration

special programming models and interfaces

automatic scaling, version management

MS azure: azure kubernetes service

amazon: labmda

Google: application engine

consumer or industrial application

to individual or enterprise use

standard applications

as well as cloud native applicaoints

autoscaling

multi-tenancy

broad spectrum of user interfaces

salesforce

google

dropbox

public cloud

community cloud

private cloud

hybrid cloud

IT resources provisioned over internet

via web applications

or services from off-site third party provider

shared by a group of organizations

own resources on top of a public cloud

examples:

• government cloud

• healthcare cloud

• educational cloud

it services offered via private networks

for exclusive use of one client

providing:

• full control over data

• security

• quality of service

• e.g. built and managed by a companies own IT organization…

access to IT services

over the internet

on-demand self service

Broad network access

Resource pooling

Rapid elasticity

Measured service

consumer can unilateraly provision computing capabilities

such as server time and network storage

as needed

automatically

without requiring human interaction with each service provider

capabilities are available over the network

and accessed through standard mechanisms

that promote use by heterogeneous thick or thin client platforms

• e.g. mobile phones, tablets, laptops, and workstations

providers computing resources are pooled

to serve multiple consumers using multi-tenant model

dynamic assignment and re-assignment of virtual resources to customers on demand

location independence

• -> user has no control / knowledge over exact location of provided resources

• but may be able to specify locaiton at higher level of abstraction

  • e.g. contruy, state, datacenter…

exemplary resources:

• storage

• processing

• memory

• network bandwidth

capabiliites can be elastically providioned and released

in some cases even autmatically

to scale rapidly outwarnd and inward commensurate with demant

cloud systems automatically control and optimize resource use

-> leverage metering capability at some level of abstraction (appropriate to type of service)

=> ressource usage can be

• monitored

• controlled

• reported

=> providing transparency for both provider and consumer of utilized service

provides capability to consumer

• -> to use providers application

• -> running on a cloud infrastructure

applications accessible from various client devices

• through either thin client interface (e.g. web browser)

• or program interface

consumer does not manage or control underlying cloud infrastructure

• including network, servers, OS, storage or even individual applicatoin capabiilities

• with possible exception of limited user-specific applicatoin configuratoin settings

capability provided to consumer

to deploy

• consumer-created

• or acquired applicatoins

using programming languages, libraries, services and tools supported by provider

consumer does not manage underlying cloud infrastructure

• including network, servers, OS or storage

consumer has control over deployed applicatoins

• and also possibly configuraiton settings for application hosting environment

capability provided to consumer is

to provision processing, storage, networks and other fundamental computing resources

wher consumer is able to deploy and run arbitrary software

• can include

• OS and applicaionts

consumer does not manage or control

• underlying cloud infrastructure

• but has control over

  • OS, Storage, and deployed applications

  • also possibly limited control of selected networing components (e.g. host firewalls)

Service oriented architectures

virtualization

server consolidatoin

grid computing

cluster computing

economy of scale

scalability

elasticity

rapid deployment

no capital invest

no caring about infrastructure

limited access to on-premise servers

fault tolerance

collaboration

security

controllability

vendor locin

cost, monthly fees

limited trust in providers

breaking SLAs

offer it service over the network

it is scalable

• in number of users and/or for single user

it is elastic

• scalable on-demand

• easy and rapid

pay per use

• vs distributed application… like own client server…

use service of cloud provider

do i require scalability and elasticity for the use?

• else: could probably do better with own infrastructure…