Both elastic IP addresses and fixed public IP addresses are used to identify and access computing resources on the Internet, but they differ in some ways. The following are some of the advantages of EIPs over fixed public IPs:
1. Flexibility:
Dynamic binding: EIPs can be dynamically bound and unbound to cloud resources, while fixed IP addresses are usually static and need to be manually configured.
Instance migration: EIPs can be quickly migrated to different cloud instances within the same region, while fixed IP addresses may take a long time to migrate or reconfigure.
2. High availability:
Automatic recovery: On some cloud platforms, EIPs have the automatic recovery function, which allows the IP address to be quickly redirected to the backup instance even if the cloud instance fails.
Failover: EIPs can be switched over to backup instances in the event of a failure, improving service availability.
3. Cost-effective:
Pay-per-use: EIPs are usually paid on a pay-per-use basis, that is, you only pay when you use them, while fixed IP addresses may be charged according to the pre-allocated method.
Resource reuse: EIPs can be flexibly reused between different instances, while fixed IP addresses may require you to pay for each instance separately.
4. Resource management:
IP release: EIPs can be easily released, while fixed public IPs may need to be manually released or unbound.
Resource tagging: EIPs are usually associated with cloud resources and are easier to tag, track, and manage through the resource management tools of the cloud platform.
In general, EIPs are more suitable for dynamic, flexible, high-availability, and on-demand cloud architectures, while fixed public IPs may be more suitable for scenarios that require stable and static configurations. The choice of which type of public IP address to use should be based on your specific business needs and cloud architecture.