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When a task run in ECS does it docker run in Foreground or in detached mode. Is it possible to set these options in the task definition?
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By default, Docker runs the container in attached mode. Meaning it's attached to the terminal session, where it displays output and messages. If you want to keep the container and current terminal session separate, you can run the container in the background using the -d attribute.
Detached mode, shown by the option --detach or -d , means that a Docker container runs in the background of your terminal. It does not receive input or display output.
Foreground. In foreground mode (the default when -d is not specified), docker run can start the process in the container and attach the console to the process's standard input, output, and standard error. It can even pretend to be a TTY (this is what most command line executables expect) and pass along signals.
Summary of the ECS Terms First we need to cover ECS terminology: Task Definition — This a blueprint that describes how a docker container should launch. If you are already familiar with AWS, it is like a LaunchConfig except instead it is for a docker container instead of a instance.
Amazon ECS supports Docker, which enables AWS users to manage Docker containers across clusters of Amazon EC2 instances. Each EC2 instance in a cluster runs a Docker daemon that deploys and runs any application packaged as a container locally on Amazon ECS without the need to make any changes to the container.
Background mode = Run in the background continuously without stopping (like daemon). Foreground or console = If you exit console the process may stop.
They run in detached mode. This is evident if you login to your container instance and inspect the docker run command used to launch your task.
An example from my ECS instance:
docker run \
[parts not shown]
--detach=true \
1234455666.dkr.ecr.us-east-1.amazonaws.com/a03c-fffffecr-fffffos4q \
python3 app.py
Notice the --detach=true option.
I'm not aware of any way to change this option. When ECS starts, there is no terminal tty to run in the attached mode anyway.
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