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Hello,
Is DHCP option set required?
DHCP option set is required in order to run ECS Fargate tasks in your VPC.
How is it being used?
- DHCP option set provides DNS nameserver configuration for your VPC.
- When you create an EC2 instance, the
/etc/resolv.conf
file gets populated with the nameserver configuration that you specify in the DHCP option sets for your VPC. All of the DNS queries within the EC2 instance uses the nameserver provided in the/etc/resolv.conf
to perform DNS resolution. - While using ECS Fargate, your tasks will run on EC2 instances that are managed by AWS.
- The underlying EC2 instance (managed by AWS) will use your DHCP option sets to configure nameserver configuration to perform DNS resolution.
- Even your ECS tasks will use the nameserver provided in the DHCP option sets to perform DNS resolution.
Is there a workaround other than setting a DHCP option set?
As you can understand from the above information, it is not possible for ECS Fargate to perform its functionalities without enabling the DHCP option sets for your VPC.
I hope this helps!
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