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What security measures are taken and what’s the process large sites use when new updates are pushed? Do they replace the current code? Do they create a new directory with the new code then redirect all traffic to that directory? Are the scripts modular? How would you accomplish this as a network and/or programming specialist? I’m quite curious about this as I’m currently working on a project I see hitting a success note in the near future.
If it’s a large site then there’s probably a load balancer sitting in front, so you can take boxes out of service, upgrade the code, perform some verification, and then put the machine back in rotation.
I would think you only need two versions in service in parallel if you’re supporting an API and the two version are incompatible in some way, i.e. you need to support a migration period. But there may be other cases.