AWS instances

An instance is a virtual server with a well specified set of resources
including:  CPU cycles, main memory, secondary storage,
communication and I/O bandwidth.
• The user chooses:
• The region and the availability zone where this virtual server
should be placed.
• An instance type from a limited menu of instance types.
• When launched, an instance is provided with a DNS name; this name
maps to a
• private IP address

for internal communication within the
internal EC2 communication network.
• public IP address

for communication outside the internal
Amazon network, e.g., for communication with the user that
launched the instance.

Network Address Translation (NAT) maps external IP
addresses to internal ones.
• The public IP address is assigned for the lifetime of an
instance.
• An instance can request an
elastic IP address
, rather
than a public IP address. The elastic IP address is a static
public IP address allocated to an instance from the
available pool of the availability zone.
• An elastic IP address is not released when the instance is
stopped or terminated and must be released when no
longer needed.

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