One of the key selling points of Platform.sh is predictable, repeatable deployments. We view the read-only production file system as a key advantage for our customers. But why is that, and how do we manage it? Just how repeatable and predictable is it?
The key to reliability is predictability. If I know my code works in testing, I should be able to predict, with a very high degree of confidence, that it will work in production, too. To do that, we need to minimize the number of variables that differ between staging and production. Zero is ideal, but anything close to zero is generally good enough.
At Platform.sh, the build process for all environments, production or not, is exactly the same. And the inputs to that build process are all consistent and largely predictable.
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