[AWS] Chapter 1 EC2 정리, for EC2 Solutions Architects

[ EC2 ]

1. EC2 instances are billed by the second, t2.micro is free tier

2.On Linux/Mac we use SSH, on Windows we use Putty

3. SSH is on port 22, lock down the security group to your IP

4.Timeout Issues => Security groups issues

5. Permission issues on the SSH key => run "chmod 0400" **

6. Security Groups can reference other Security Groups instead of IP ranges ***

7. Know the difference between Private, Public and Elastic IP

8. You can customize an EC2 instance at boot time using EC2 User Data

9. Know the 4 EC2 launch modes : On demand/Reserved/Spot instances/Dedicated Hosts

10. Know the basic instance type: R, C, M, I, G, T2/T3

11. You can create AMIs to pre-install software on you EC2 => faster boot

12. AMI can be copied across regions and accounts

13. EC2 instances can be started in placement groups: Cluster/Spread/Partition