aws fargate docker container instances not able to get local hostname

Question

We have a part of our Java application that needs to determine what the local hostname is.

But whenever we try to get them via

InetAddress.getLocalhost().getHostName()

we get:

org.quartz.JobExecutionException: java.net.UnknownHostException: 22e51fd8a6fb: 22e51fd8a6fb [See nested exception: java.net.UnknownHostException: 22e51fd8a6fb: 22e51fd8a6fb]

When we do this via ec2 instances, it seems to work fine. Is there some kind of limitation on fargate, or potentially some configuration that could be tweaked?

Answer 1

Verify "DNS hostnames" is set as "Enabled" in you VPC settings. This should fix the problem.