Hello Undine, The issue is the hostname. What is the result when you run command  hostname and hostname -i ? i will recommend to update hostname to be ecs-single-node. update hosts file to reflect the new hostname and pass ecs-single-node as parameter value.
I tried get a single node ECS running in AWS. I launched a CentOS 7 instance and cloned the ECS repository from Github. Unfortunately the step1_ecs_singlenode:install Python script failed with the following error message: [IMAGE] The command I executed looks like: [IMAGE] The /etc/ hosts and /etc/sysconfig/network on my CentOS instance looks like [IMAGE] [IMAGE] Any idea what I've to change to get my container configured and running?  Thanks Undine
Dockerized single-node ECS in AWS