
The triggers are just arbitrary strings that are included in the unit under X-Restart-Triggers. The idea is that if they change between reconfigurations, switch-to-configuration will restart the unit because its store path changed. This is mostly useful for services that implicitly depend on generated files in /etc. Thus you can say restartTriggers = [ confFile ]; where ‘confFile’ is the derivation that generated the /etc file in question.
*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at http://nixos.org/nixos and in the manual in doc/manual.
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