Using ECS Exec with read-only root file system containers

As stated in the official ECS Exec documentation, ECS Exec today doesn’t support read-only containers. The SSM agent requires that the container file system is able to be written to in order to create the required directories and files. Therefore, making the root file system read-only using the readonlyRootFilesystem task definition parameter, or any other method, isn’t supported. This limitation

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“/var/lib/amazon and /var/log/amazon”