EC2

Once an EC2 instance is running, it needs somewhere to put data. AWS gives you three kinds of disk to attach to a VM, and each one behaves very differently. The options Type Storage Lifecycle Scope EBS Block, network-attached Persistent One AZ Instance Store Block, physically on the host Ephemeral — lost on stop/terminate One host EFS File (NFS), network share Persistent Multi-AZ Mental model EC2 ──attaches──> EBS volume (its own dedicated disk, persistent) EC2 ──has──────> Instance Store (host's physical NVMe, ephemeral) EC2 ──mounts───> EFS (network file share, many EC2s share it) In plain terms:...

EC2 is the compute layer of AWS — rentable virtual machines. When you need a server to run an application, EC2 is where it lives. The core pieces Launching an EC2 instance means assembling a handful of parts. Each one answers a specific question. Piece What it is Instance A running VM AMI The image/template the VM boots from — OS plus pre-installed software Instance Type Sizing — CPU, RAM, network (e....