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by comprev 1467 days ago
Zero-downtime deployments have existed years (perhaps decades?) before k8s was released to the public.

Controlling the upstream traffic via haproxy/nginx allowed Ops to roll out blue-green, canary and waterfall/rolling deployment methods albeit with more human interaction.

Digital Ocean have this [0] article from 2014 on load balancing.

[0] https://www.digitalocean.com/community/tutorials/an-introduc...