Qu'est-ce qu'Elastic IP ? (Explication des proxys)
Une adresse IP élastique est une adresse IP statique fournie par des fournisseurs de services cloud tels qu'AWS. Contrairement aux adresses IP classiques, les adresses IP élastiques sont conçues pour rester cohérentes même lorsque les serveurs ou les instances sont redémarrés. Ils sont souvent utilisés pour les applications nécessitant une adresse IP fixe, garantissant un accès fiable et une gestion simplifiée pour les utilisateurs.
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Cas d'utilisation
Running proxy infrastructure
Elastic IPs provide stable entry points for proxy services. This ensures clients can consistently connect without DNS changes every time an instance restarts.
Reliable DNS pointing
If your domain points directly to an EC2 instance, an Elastic IP prevents disruptions caused by changing public IPs.
Application licensing
Many server tools, like WHM/cPanel, tie licenses to a fixed IP. Elastic IPs make sure those licenses remain valid.
Failover and redundancy
If a proxy node or server fails, you can instantly remap the Elastic IP to a backup instance—keeping traffic flowing with minimal downtime.
Meilleures pratiques
Use Elastic IPs only where needed
They’re ideal for proxy endpoints and public-facing services, but don’t assign them to every instance. Elastic IPs are limited per region (default: 5).
Release unused Elastic IPs
Since AWS charges for idle EIPs, make sure you release any that aren’t actively attached to running instances.
Automate remapping
In proxy fleets or scaling environments, scripts or orchestration tools (like Terraform or Ansible) can automatically reassign Elastic IPs during failover or scaling events.
Secure the endpoint
Even with a stable IP, always protect your proxy endpoints with proper firewalls and access controls to prevent abuse.
Conclusion
An Elastic IP is a permanent, public IPv4 address in AWS. It ensures stability across restarts and makes it easy to move traffic between instances. For anyone running proxies, hosting services, or licensing software tied to IP addresses, Elastic IPs are the simplest way to keep infrastructure reliable.
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Question fréquemment posée
Do I always need an Elastic IP for proxies?
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Yes, if clients or software connect directly to a fixed IP. Otherwise, you’d need to reconfigure DNS every time an instance’s IP changes.
Are Elastic IPs free?
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Yes, as long as they’re attached to a running instance. AWS charges for unused ones.
How many Elastic IPs can I have?
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By default, five per region. You can request more from AWS if your proxy network or infrastructure requires it.
Can I move an Elastic IP to another instance?
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Absolutely. That’s one of their biggest strengths—Elastic IPs can be remapped within seconds during failover or scaling.
