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When using Fargate launch type on ECS, the containers will have random IDs assigned instead of stable hostnames. Eureka relies on hostnames, so it won't work out of the box.
You have a few options to set stable hostnames for the containers:
- Use ECS tasks definitions to assign hostnames via
hostname
parameter - Configure ECS tasks to use AWS Elastic Network Interfaces (ENIs) which provide static IPs/hostnames
- Use service discovery solutions like AWS Cloud Map or Consul which are better integrated with ECS
For simple testing, you can try using the host
network mode instead of bridge
to assign the EC2 hostname to containers. However, this tightly couples containers to hosts.
Make sure your Eureka clients are configured to register using IP addresses instead of hostnames for high availability on ECS/Fargate.
Consider alternative service discovery solutions like AWS Cloud Map or Consul that are better integrated for container-based workloads on ECS.
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