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cloud-init instance crash with MIMEBOUNDARY userdata #2588
Container Linux Version
AWS EC2 m5.* c5.*
instance boots and is usable with multipart user-data
the instance is stuck in boot and does not recover
stumbled upon this while trying to use the kops mixed isntance types / spot fleet
the launch template contains the
referenced this issue
Jun 3, 2019
coreos-cloudinit is not the same as Canonical's Cloud-Init and doesn't support MIME messages; YAML and scripts only. As a result, Ignition (the replacement for coreos-cloudinit) also doesn't understand that this is intended for coreos-cloudinit and so it tries and fails to parse it. That's what's causing your reboot loop.
coreos-cloudinit has been deprecated for a while now. You should try to migrate to Ignition instead.