what am trying to get is when we delete an instance in GCP and create a new instance with same configurations (name, zone etc.) how does our other compute resources treat this just as an replacement of our old deleted instance?
1 Answers
DNS resolution and FQDN are the answer to it.
Each instance have a host name (it’s nothing but instance name) which could be resolved to a internal IP address Each instance also have a FQDN (fully qualified domain name) for an instance which is in following formats
FQDN is [hostname].[zone].c.[project-id].internal
Before deletion :[hostname].[zone].c.[project-id].internal1
After deletion :[hostname].[zone].c.[project-id].internal2
DNS name always points to a specific instance no matter what internal IP address is. Each instance has a metadata server which acts as a DNS resolver. As a result all your other compute resources will have seamless connectivity with the new instance
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