NixOps used to be the only Nix-native deployment and provisioning tool, but it failed. NixOps4 is a complete redesign of the tool, taking lessons from NixOps, taking inspiration from Terraform, and borrowing its providers. In doing so, it creates a unified deployment platform, architecturally similar to how Nix is a platform for unified builds. It allows you to combine configurations freely with the Nix language and build system, and it makes it easy to "extend" the tool.

In this presentation, we'll have a look at the concepts that make up NixOps4, as well as its integration into the Fediversity project, which aims to enable hosting providers to let their customers deploy applications such as Mastodon, PeerTube and Pixelfed, fully automatically - running NixOps4 "unattended" in production.