fb2fa1b50f
Consider a service that generates postfix lookup tables with postmap(1), like Mailman. It needs the Postfix configuration file to exist, but Postfix qmgr needs all the lookup tables its configured with to exist before it starts. So the service that runs postmap needs to run after the Postfix configuration and directory structure is generated, but before Postfix itself is started. To enable this, we split Postfix into two units: a oneshot unit that sets up the configuration, and a longrun unit that supervises the Postfix daemons. The postmap services can then be inserted in between these two units. |
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*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at https://nixos.org/nixos and in the manual in doc/manual.