Retrieving DNS Name and Port Before the onGameSessionStart Callback

Question

I am currently writing a server using the C# SDK. I would ideally like to retrieve the DNS Name and Port of the process before calling ProcessReady(), as there is some initialization I would to do with that information. Is this possible? Am I misunderstanding a part of the process?

Thanks for the help!

Accepted Answer

Hi @REDACTEDUSER

Those are certainly possible.

For DNS name of the instance, you'd need to use EC2 metadata, see "HostName" in https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/instancedata-data-categories.html. Here is how you can retrieve the data: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/instancedata-data-retrieval.html

Port, on the other hand, is under your control. The recommendation is to pass them in via command line argument when executing your game server process, e.g.

```
aws gamelift create-fleet --region $REGION \
--name "TestFleet" --ec2-instance-type c5.large  \
--ec2-inbound-permissions FromPort=6252,ToPort=6254,IpRange="0.0.0.0/0",Protocol=TCP FromPort=22,ToPort=22,IpRange="0.0.0.0/0",Protocol=TCP \
--build-id $BUILD_ID \
--runtime-configuration ServerProcesses="[{LaunchPath="/local/game/gamelift-test-app",Parameters='port:6251 gameSessionLengthSeconds:10',ConcurrentExecutions=1},\
{LaunchPath="/local/game/gamelift-test-app",Parameters='port:6252 gameSessionLengthSeconds:10',ConcurrentExecutions=1},\
{LaunchPath="/local/game/gamelift-test-app",Parameters='port:6253 gameSessionLengthSeconds:10',ConcurrentExecutions=1},\
{LaunchPath="/local/game/gamelift-test-app",Parameters='port:6254 gameSessionLengthSeconds:10',ConcurrentExecutions=1}]"
```

Then, in my `gamelift-test-app`, I retrieve the `port` parameter from the CLI and use that for ProcessReady.

Answer

That is exactly what I was looking for. Thank you for the help!

Retrieving DNS Name and Port Before the onGameSessionStart Callback

Relevanter Inhalt