How do I download one or more files from a stopped Fargate task? - aws-fargate

Question

I have an ECS task that runs some test cases. I have it running in Fargate. Yay!
Now I want to download the test results file(s) from the container. I have the task and container IDs handy. I can find the exit code with
aws ecs describe-tasks --cluster Fargate --tasks <my-task-id>
How do I download the log and/or files produced?

Answer 1

It looks like, as of right now, the only way to get test results off of my server is to send the results to S3 before the container shuts down.
From this thread, there's no way to mount a volume / EFS onto a Fargate container.
Here's my bash script for running my tests (in build.sh) and then uploading the results to S3:
#!/bin/bash
echo Running tests...
pushd ~circleci/project/
export AWS_ACCESS_KEY_ID=$AWS_ACCESS_KEY
export AWS_SECRET_ACCESS_KEY=$AWS_SECRET_KEY
commandToRun="~/project/.circleci/build_scripts/build.sh";
# Run the command
eval $commandToRun 2>&1 | tee /tmp/build.log
# Get the exit code
exitCode=$?
aws s3 cp /tmp/build-$FEATURE.log s3://$CICD_BUCKET/build.log \
--storage-class REDUCED_REDUNDANCY \
--region us-east-1
exit ${exitCode}
Of course, you'll have to pass in the AWS_ACCESS_KEY, AWS_SECRET_KEY and CICD_BUCKET environment variables. The bucket name you choose needs to be pre-created, but any directory structure below it does NOT need to be created in advance.

Answer 2

You probably want to look at using CodeBuild for this use case, which can automatically copy artifacts to S3.
It's actually quite easy to orchestrate the following using a simple bash script and the AWS CLI:
Idempotently Create/Update a CodeBuild project (using a simple CloudFormation template you can define in your source repository)
Run a Codebuild job that executes a given revision of your source repository (using again a self-defining buildspec.yml specification defined in your source repository)
Attach to the CloudWatch logs log group for your CodeBuild job and stream log output
Finally detect when the job has completed successfully or not and then download any artifacts locally using S3
I use this approach to run builds in CodeBuild, with Bamboo as the overarching continuous delivery system.