How do I troubleshoot 'Container commands build failed' generic error in AWS Elastic Beanstalk?

Question

Problem

I'm following this AWS documentation to enable HTTPS in my Flask Elastic Beanstalk environment. When I follow the steps outlined, I get the following error:

2020/08/24 21:30:04.183362 [INFO] Running command /bin/sh -c /opt/aws/bin/cfn-init -s 
       arn:aws:cloudformation:us-east-1:XXXXXXXXX:stack/awseb-e-XXXXXXXXX-stack/
       XXXXXXX-XXXX-XXXX-XXXX-XXXXXXXX-r AWSEBAutoScalingGroup --region us-east-1 
       --configsets Infra-EmbeddedPostBuild
2020/08/24 21:30:04.592591 [ERROR] An error occurred during execution of command 
       [app-deploy] - [PostBuildEbExtension]. Stop running the command. Error: Container 
       commands build failed. Please refer to /var/log/cfn-init.log for more details. 

I do not have ssh access to the EC2 instances that I deployed. I'm wondering about troubleshooting this particular issue, and generally how to deal with this situation in Elastic Beanstalk.

Question

1. What issue might be causing the Error: Container commands build failed above?
2. What can I do to troubleshoot an issue like this if I don't have ssh access to my EC2 instance? Is there a way to view these cfn-init.log files?

Context

The app works perfectly if I exclude this 02_https_instance.config file from my source code. I am wondering if the AWS example needs to be updated for Linux 2, as the mod24_ssl they suggest is for Linux 1, whereas I have to use mod_ssl in this version (Reference). Are there other code updates that are required to make this work?

Answer 1

What issue might be causing the Error: Container commands build failed above?

Container commands is a section in your .ebextentions. Thus it seems a commend defined in container_commands section failed.

What can I do to troubleshoot an issue like this if I don't have ssh access to my EC2 instance? Is there a way to view these cfn-init.log files?

You can download all log files form EB console:

You have to explicitly ask EB to get the files using the menu on the right. By default, the logs panel will be empty if you don't ask.