AMI’s are available asPublicAvailable to public in EC2Downloadable from the Amazon Resource Center Can be used as a base to create custom private AMIsPrivate Owned and accessed by individualsPaid Order before useCome with service contracts from vendors
EC2 instances are assigned an IP when startedIf you stop and start your EC2 instance, IP will changeYou can reserve an IP (Elastic IP) and assign it to EC2 instancesYour elastic IP will never changeTwo uses:Have a well known IP for your services and appsVertically scale your deploymentAssociate your elastic IP to a bigger or smaller EC2 instance Elastic IP addresses are statically mapped IP addresses that can be assigned to your instances, once initiated You can assign your Elastic IP either from the management console, or via the AWS EC2 API In any case, your internal host’s IP address always changes – if you turn your instance OFF This can pose an interesting configuration issue when utilizing Asterisk and SIP (externip and externhost)