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by resc1440 4128 days ago
Amazon's security advisory seems to indicate that they have this capability for 90% of EC2 instances (leaving 10% that must be rebooted). https://aws.amazon.com/premiumsupport/maintenance-2015-03/
2 comments
cesarb 4128 days ago
It could be either that (live patching) or live migration: do a live migration of all instances on this host to an already patched host, reboot the host, repeat for the next host.
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lscotte 4128 days ago
Not really - to me, it implies that 90% of EC2 instances are not running on a vulnerable version of Xen...
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nmjohn 4127 days ago
FTA:

> While all instance types need to be updated, we have developed the capability to live-update instances running on newer hardware. The vast majority of the EC2 fleet will be live-updated, but a portion of instances (less than 10% of customer EC2 instances) running on older hardware will require a reboot to complete the update process.

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