Part 1 Flashcards
What is cloud computing?
Delivery model for services like storage/apps/compute power/networking/analytics through the internet
Scalability
Scale up and down based on demand
- Vertical Scaling (up and down)
- Horizontal Scaling
Vertical Scaling
Increase the size like memory of a machine up or down
Horizontal Scaling
Increase the amount of machines of a machine
Elasticity
Able to allocate/deallocate based on demand
Automatic Scaling
When the machine does the allocation/deallocation automatically
Agility
Ability to react quickly based on user’s request
- if they ask for a VM, should be done in a matter or seconds to mins
Fault Tolerance
Ability to maintain up and running based on different failures
- If a storage disk is destroyed, no worries! We have it saved in 3 other disks
Disaster Recovery
Set up at least 2 copies in different regions, done through replication
High Availability
Uptime/(uptime + downtime)
- Ability to keep services running for extended periods of time with very little downtime
Scaling in
refers to deallocating resources
Scaling out
refers to allocating resources
Economics of Scale
More customers, lower prices
CapEx vs OpEx
CapEx = up front cost to buy everything
OpEx = cost to run everything
Consumption Based Model
Only pay for what you use
SaaS
Data/Apps
- You own nothing, just using the service like PowerPoint
PaaS
Dockers, OS, middleware/software, AI, SQl, Logic Apps, Function Apps
- Building applications
IaaS
Storage, servers, networking, VMs
Resource Group
Container for multiple resources that are related
How to manage resource groups?
- Types
- Lifecycle (app, envrioment)
- Department
- Region/location in the world
Resource
Used to manage services in Azure
What are compute services?
Category of on-demand services used to run cloud based applications
Virtualizaiton
Amazon has their data centers with machine racks/PCs. One PC is split into multiple VMs with their own boundaries
- Emulation of physical machines
How to create a VM in Azure?
Azure Virtual Machine Services
- UBUNTU/Windows/Orcale or other image
- IaaS
RDC
Remote Desktop Connection
How to scale VMs in the cloud?
VM Scale Set
Containers vs VMs
Containers instead of Virtualization software uses container runtime
- Container uses the OS of the system
- Containers used for web app
- Containers are faster than VMs
- Containers best used for small faster apps
Containers
- No OS, it uses the default OS that its based on
- Light weight
- Faster than VMs
- Host an APP
How to run containers?
ACI (Azure Container Instance)
ACI
Azure Container Instance
- Grabs the app/configurations and makes an image that the ACI will launch to the user
- PaaS
- Designed for small and simple web applications
- no autoscaling, no servers
AKS
Azure Kubernetse Service
- PaaS
- Open-source (used in AWS/Google etc…)
- Highly scalable and customaizable to deploy containers at high scale
App Services
Used to make app services
- send the image to the web that users can access
- PaaS
- less control over configuration but good for high scale/ease
Azure Functions (funtion apps)
Runs small funcitons of code as a web service
- very similar to app services
- PaaS
- serverless
- consumtion based or dedicated plan
Purpose of a VM?
- IaaS
- Custom software, custom requirements, very specialized, high degree of control
Purpose of VM Scale Set
- IaaS
- Auto-scaled workloads for VMs
Purpose of Container Instances
- PaaS
- Simple container hosting, easy to start
Purpose of Kubernetes Service
- PaaS
- Highly scalable and customiazeable container hosting platform
Purpose of App Services
- PaaS
- web applications, a lot of enterprise web hosting features
- easy to start
