Virtualization

Host machines contains multiple virtual computers on a single machine. This machine requires a system called a “hypervisor” which runs between the hardware and the virtual hardware and machines.

• Virtual Machines are granted permissions to certain system resources such as CPU, RAM, disk, Network Cards, GPU, etc.

Benefits

• Single machine makes it easier for
  • testing
  • security
  • snapshots
  • sandboxes
  • development software

Emulators vs Virtualization

Hypervisors pass core host machine resources to the virtual machine Emulators simulate both hardware and software

Network Requirements

• Internal Networking: Only aces to other Virtual Machines
• Bridge Networking: Way to get a VM connected to the internet
• Virtual Switch: Hypervisors have built in
• Air Gap: No network access

Server Side Virtualization

• Bare metal: there’s no other software between it and the hardware
• VMware’s ESXi is a free hypervisor

Cloud Computing

• Virtual Machines in the cloud
• Public cloud is built on a cloud provider’s system: AWS, GCP, Azure, Docker Hub, etc.
• There is a private cloud, public cloud, and hybrid cloud.

Benefits

• Scaling
• Flexibility
• Scalability
• Geolocation
• Replication
• Disaster Recovery
• Cost
• Security
• Billing and Reporting
• Usage Analytics

Services

• Platform as a Service (PaaS)
• Infrastructure as a Service (IaaS)
• Software as a Service (SaaS)
• Identity as a Service (Iaas)

Public Cloud

• Available to the general public by a service provider who hosts the cloud infrastructure.
• Private: Cloud is a cloud infrastructure dedicated to a particular organization.
• Community cloud is a a multi-tenant cloud service model that is shared among several organizations.
• Hybrid: clouds are a composition of two or more clouds (private, community, or public) that remain unique entities.