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DNS servers that are pre-configured on EC2 instances seem to be only:

Does anyone know if thats a dedicated DNS VIP for a specific region? Should we add more DNS servers in for fault tolerance?

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up vote 1 down vote accepted

I've never felt the need for anything else.

ec2-user@ip-10-112-39-42:~$ cat /etc/resolv.conf 
domain ec2.internal
search ec2.internal

Feel free to change it if you want, though be aware that external DNS servers won't be able to resolve ec2.internal addresses.

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