AWS Elastic Compute (EC2)

 Instance Launch Types:

1. On Demand Instance Type:

1. Short Workload predictable pricing

2. Reserved Instance Type:

1. Known amount of type (at least say 1 year we will keep this instance)

2. Minimum for 1 year

3. Types:

1. Convertible Reserved Instance (long workload and flexible instance).

2. Scheduled Reserved Instance: Example I need an instance for every Thursday for a time period 3PM to 6PM and at least for a year.

3. Spot Instance Type:

1. Short Workloads for cheap and can lose instance (less reliable).

4. Dedicated Instance Type:

1. No other customer can share the underlying hardware instance.

5. Dedicated Hosts: 

1. Book an entire physical server, control the instance placements.

Instance Types:

1. R -> RAM

2. C-> Compute

3. I -> I/O

4. M -> Medium

5. G -> GPU

6. T2/T3 -> Burstable (up to capacity)

7. T2/T3 -> Unlimited Burst

T2/T3→ Once it reaches the threshold it uses CPU credits (bursting) and once credit is over you lose performance

T2/T3 Unlimited Burst → you pay extra post CPU credits but you don’t lose the performance.