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pracucci/aws-ec2-nitro-instance-halt.md

Created August 12, 2019 16:44
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Notes on differences on the "halt" command on AWS EC2 Nitro instances
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aws-ec2-nitro-instance-halt.md

The halt command on EC2 Nitro instances doesn't poweroff the instance, so the OS will shutdown but the instance will be in the running state indefinitely (until you force a "stop" or "termination" via EC2 console / API). This is because the hypervisor has changed and the shutdown signaling between OS and the hypervisor behaves differently.

Works (the instance switches to "stopped" or "terminated"):

  • halt --poweroff
  • shutdown now (defaults to --poweroff)

Doesn't work (the instance hungs into a "running" state):

  • halt
  • shutdown --halt
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