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fix: automatic garbage collection
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64
NixOS.md
64
NixOS.md
@ -12,14 +12,17 @@ This document contains general notes about NixOS that are independent of my NixO
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* [niv: Dependency management](#niv-dependency-management)
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* [Add Home Manager with niv](#add-home-manager-with-niv)
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* [Add NUR with niv](#add-nur-with-niv)
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* [Garbage collection](#garbage-collection)
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* [System information](#system-information)
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* [Search for packages](#search-for-packages)
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* [Search for options](#search-for-options)
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* [Search which package owns a file](#search-which-package-owns-a-file)
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* [List files of package](#list-files-of-package)
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* [Package runtime dependency report](#package-runtime-dependency-report)
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* [Compare two versions of NixOS system profile](#compare-two-versions-of-nixos-system-profile)
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* [Nix profiles](#nix-profiles)
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* [List system profiles](#list-system-profiles)
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* [Garbage collection - Keep most recent X system profiles](#garbage-collection---keep-most-recent-x-system-profiles)
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* [Garbage collection - Delete system profiles older than X days](#garbage-collection---delete-system-profiles-older-than-x-days)
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* [Compare two system profiles](#compare-two-system-profiles)
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* [NixOS configuration debugging](#nixos-configuration-debugging)
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* [Show Nix configuration](#show-nix-configuration)
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* [Evaluate NixOS configuration to JSON](#evaluate-nixos-configuration-to-json)
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@ -144,25 +147,6 @@ niv add nix-community/home-manager -n home-manager -b release-23.05
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niv add nix-community/NUR -n NUR
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```
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## Garbage collection
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* https://nixos.org/manual/nix/stable/package-management/garbage-collection.html
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* https://discourse.nixos.org/t/why-doesnt-nix-collect-garbage-remove-old-generations-from-efi-menu/17592/4
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This is automated in [base.nix](modules/base.nix) with the `nix.gc` option.
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Run manually for all profiles:
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```shell
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sudo nix-collect-garbage --delete-older-than 14d
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```
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Remove leftover EFI entries of removed generations:
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```shell
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sudo /run/current-system/bin/switch-to-configuration boot
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```
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## System information
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```shell
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@ -476,7 +460,43 @@ runtime dependencies of firefox-121.0.1:
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- libXau-1.0.11 (no license) maintained by nobody
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```
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## Compare two versions of NixOS system profile
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## Nix profiles
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### List system profiles
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```shell
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sudo nix-env --list-generations --profile /nix/var/nix/profiles/system
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```
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### Garbage collection - Keep most recent X system profiles
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A NixOS config example is given in [base.nix](modules/base.nix).
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```shell
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sudo nix-env --delete-generations +7 --profile /nix/var/nix/profiles/system
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```
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### Garbage collection - Delete system profiles older than X days
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* https://nixos.org/manual/nix/stable/package-management/garbage-collection.html
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* https://discourse.nixos.org/t/why-doesnt-nix-collect-garbage-remove-old-generations-from-efi-menu/17592/4
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A NixOS config example is given in [base.nix](modules/base.nix).
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Run manually for all profiles:
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```shell
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sudo nix-collect-garbage --delete-older-than 14d
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```
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Remove leftover EFI entries of removed generations:
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```shell
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sudo /run/current-system/bin/switch-to-configuration boot
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```
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### Compare two system profiles
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Get latest system profile. This is the profile (usually) being active after booting the system:
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41
modules/base-gc.nix
Normal file
41
modules/base-gc.nix
Normal file
@ -0,0 +1,41 @@
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{ config, pkgs, ... }:
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{
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# Based on https://github.com/NixOS/nixpkgs/blob/nixos-23.11/nixos/modules/services/misc/nix-gc.nix
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assertions = [{
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assertion = config.nix.enable;
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message = ''nix-gc-7 requires nix.enable'';
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}];
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systemd.timers."nix-gc-7" = {
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wantedBy = [ "timers.target" ];
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partOf = [ "nix-gc-7.service" ];
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timerConfig = {
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OnCalendar = "weekly";
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Persistent = true;
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AccuracySec = "2d";
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RandomizedDelaySec = "1d";
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};
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};
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systemd.services."nix-gc-7" = {
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description = "Keep only the most recent 7 system generations";
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conflicts = [ "shutdown.target" "sleep.target" ];
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before = [ "shutdown.target" "sleep.target" ];
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serviceConfig = {
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Type = "oneshot";
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PrivateTmp = true;
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Nice = 19;
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IOSchedulingClass = "idle";
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};
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script = ''
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set -eu -o pipefail
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${config.nix.package.out}/bin/nix-env --delete-generations +7 --profile /nix/var/nix/profiles/system
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'';
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};
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}
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@ -74,18 +74,16 @@
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nix.settings.auto-optimise-store = true;
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# Keep only most recent 7 system generations
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imports = [ ./base-gc.nix ];
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#
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# Alternatively: Delete generations older than 7 days
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# https://nixos.wiki/wiki/Storage_optimization#Automation
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nix.gc = {
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automatic = true;
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dates = "weekly";
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# Options given to nix-collect-garbage.
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# They are documented here: https://nixos.org/manual/nix/stable/command-ref/nix-collect-garbage
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# The `--delete-older-than <period` option refers the manual for `nix-env --delete-generations <period>`: https://nixos.org/manual/nix/stable/command-ref/nix-env/delete-generations#generations-time
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# There, two meanings of <period> are described. The second one is:
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# +<number>: Keep the last number generations, along with any newer than current.
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# TODO: +7 does currently not work. There is an open issue: https://github.com/NixOS/nixpkgs/issues/282884
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options = "--delete-older-than +7";
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};
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#nix.gc = {
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# automatic = true;
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# dates = "weekly";
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# options = "--delete-older-than 7d";
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#};
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# Delete all files in /tmp during boot.
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boot.tmp.cleanOnBoot = true;
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