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A comment on How release canaries can save your bacon. Parent comment

Re:How release canaries can save your bacon by londons_explore on Tuesday April 04, 2017 @06:20AM (#14031088)
Another approach is you start up a full copy of the new system with all new versions, then change loadbalancers to direct all traffic away from the old system and to the new. Then decomission the old system.

With dedicated hardware, you need twice as much hardware. With cloud, you only pay double for 10 minutes during the rollout, which usually is very cheap.

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Re:How release canaries can save your bacon by skookum on Tuesday April 04, 2017 @01:38PM (#14035287)
That approach only works if your system is stateless, a caveat which excludes virtually all large-scale systems.
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