Exposing dockerfile content to an EFS volume in Fargate 1.4.0
There is a page of Amazon ECS documentation that I tried to consume without success a couple of weeks ago. Possibly because of an AWS introduced regression in the Fargate platform. Possibly because my use-case is subtly different from the use case AWS tested. I reread the documentation several times, but ultimately failed to find a flaw in my configuration that explained why I was unable to elicit the desired behavior from Amazon ECS.
The use case in question was a deployment of OpenEMR to ECS with a stateful EFS volume mounted to the /var/www/localhost/htdocs/openemr/sites directory within the deployed container. Without this configuration, the state of my OpenEMR cluster would not persist beyond the lifecycle of each executing task, rendering my OpenEMR storage volatile and highly unsuitable for a production workload.
Running Fargate tasks is pretty routine at this point and so I was somewhat surprised1 to receive a fatal error preventing the standard OpenEMR built container from starting in task logs upon container start-up:
