Amazon AWS Reserved Instance

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  • What constitutes "ephemeral storage?"
  • Instance resides in a security group
  • Storage resides within in Amazon Elastic Block Store (EBS)
    • Root volume is an EBS-backed volume
  • All resides within an Availability Zone
  • Secure instance by specifying a key pair and a security group
  • PV = Para-virtualization = pros: high performance, cons: OS/kernel custimization impossible, linux only
  • HVM = Hardware-assisted virtualization = pros: stability, low performance
  • VPC = Virtual private cloud = free.
    • public and private subnets to facilitate running applications
    • store data in s3 and set permissions such that data can only be accessed by my VPC
  • Network access control list (ACL) - an optional layer of security that acts as a firewall for controlling traffic in and out of a subnet.

Storage for the root device

  • EBS-backed = 5 cents per GB per month + 5 cents per 1e6 io requests
    • snapshots just save the diff so relatively cheap
    • persistent storage between instance terminations
  • Instance Store-Backed = S3
  • IOPS = input/output operations per second
    • PIOPS = Provisioned IOPS, I guess like a dedicated highway for your data, don't have to share the highway with other people?
  • EBS-Optimized Instances
    • Used for storage optimized instances, like c3.xlarge
    • dedicated throughput to Amazon EBS I/O. Requires additional hourly fee

Route Table

  • a set of rules used to determine where network traffic is directed

Elastic IP

  • A permanent IP associated with your account, not a particular instance
  • If an instance goes down, can remap a replacement instance to the elastic IP, rather wait for a new server's IP to propagate in the DNS
  • first one is free, plus 100 remaps free, more will cost you
  • three IPs, private IP (intra cloud), public IP for instance, elastic IP (one per account)


  • public IP - comes with allocation
  • Instance ID - right click on the elastic IP and click "associate with instance" ... in my case that instances's public IP became the elastic IP.

Launch EC2 Instance

  1. EC2 Console
  2. Make sure your VPC has inbound SSH HTTP and HTTPS rules