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Elastic IP

Elastic IPΒΆ

  • When you stop and then start an AWS EC2 instance, it can change it's Public IP
  • If you need to have a fixed public IP for your instance, you need an Elastic IP
  • An elastic IP is a public [[IPv4]] IP you own as long as you don't delete it
  • You can attach to it one instance at a time
  • With an Elastic IP address, you can mask the failure of an instance or software by rapidly remapping the address to another instance on your account
  • You can only have 5 Elastic IP in your account (you can ask AWS to increase that)
  • Overall, try to avoid using Elastic IP
    • They often reflect poor [[architectural decisions]]
    • Instead, use a random public IP and register a DNS name to it
    • Or use a Load Balancer and don't use a public IP at all