Antipattern: ECS + yum update
This is part of our antipatterns series. Ouch! With the recent bugs in ecs-agent 1.8.0, you may be trying to roll back to amzn-ami-2015.09.e or earlier to get a last-known-good ecs agent. If you have yum update in your userdata, however, it updates ecs-init and that,
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