Ah, my bad, I misunderstood. It's pretty normal for tech companies to do dozens of deploys a day, thanks to CI/CD. There are lots of ways to achieve this, but

Ah, my bad, I misunderstood. It's pretty normal for tech companies to do dozens of deploys a day, thanks to CI/CD. There are lots of ways to achieve this, but they all pretty boil down to the same idea: Boot up the new version before shutting down the old version.