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Immutable salt

I intend to use salt as an automated build tool, for which I wish to use the concept of immutable servers.

Mostly its pretty simple - have one automated build system to build a (virtual) server from scratch, and make sure that server is exactly the same each time. Same OS, same package installs, same config files.

Change something? Thats a new version - a different immutable server.

Need to upgrade nginx, then your SaaS app needs to get pulled off v.1.2.3 servers and onto v.1.2.4

You do not upgrade nginx in-situ.

Thats it really.