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fix: nix garbage collection

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This commit is contained in:
Daniel Langbein 2024-11-11 11:48:49 +01:00
parent 426decfc4e
commit e19db18b71
Signed by: langfingaz
GPG Key ID: 6C47C753F0823002
2 changed files with 39 additions and 32 deletions
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59
NixOS.md
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@ -21,8 +21,8 @@ This document contains general notes about NixOS that are independent of my NixO
* [Nix profiles](#nix-profiles) * [Nix profiles](#nix-profiles)
* [Switch to previous system profile](#switch-to-previous-system-profile) * [Switch to previous system profile](#switch-to-previous-system-profile)
* [List system profiles](#list-system-profiles) * [List system profiles](#list-system-profiles)
* [Garbage collection - Keep most recent X system profiles](#garbage-collection---keep-most-recent-x-system-profiles) * [Deleting generations - Keep most recent X system profiles](#deleting-generations---keep-most-recent-x-system-profiles)
* [Garbage collection - Delete system profiles older than X days](#garbage-collection---delete-system-profiles-older-than-x-days) * [Garbage collection - Delete unreachable store objects](#garbage-collection---delete-unreachable-store-objects)
* [why-depends: Why is a package/dependency installed](#why-depends-why-is-a-packagedependency-installed) * [why-depends: Why is a package/dependency installed](#why-depends-why-is-a-packagedependency-installed)
* [Compare two system profiles](#compare-two-system-profiles) * [Compare two system profiles](#compare-two-system-profiles)
* [NixOS configuration debugging](#nixos-configuration-debugging) * [NixOS configuration debugging](#nixos-configuration-debugging)
@ -448,33 +448,24 @@ sudo reboot
### List system profiles ### List system profiles
Not sure why 432 is marked as current. It is the default generation that gets activated on next boot. The currently active generation is, however, 429.
```shell ```shell
sudo nix-env --list-generations --profile /nix/var/nix/profiles/system sudo nix-env --list-generations --profile /nix/var/nix/profiles/system
``` ```
```console ```console
... ...
428 2024-03-06 12:37:56 282 2024-11-10 12:53:25
429 2024-03-07 11:27:20 283 2024-11-11 10:45:46 (current)
430 2024-03-10 12:48:34
431 2024-03-11 11:18:57
432 2024-03-12 22:19:53 (current)
``` ```
```shell ```shell
ls -l /nix/var/nix/profiles/ ls -l /nix/var/nix/profiles/
``` ```
```console ```console
lrwxrwxrwx 1 root root 43 Dez 14 12:21 default -> /nix/var/nix/profiles/per-user/root/profile lrwxrwxrwx 1 root root 43 Dez 26 2023 default -> /nix/var/nix/profiles/per-user/root/profile
drwxr-xr-x 1 root root 16 Sep 1 2023 per-user drwxr-xr-x 1 root root 16 Aug 15 2023 per-user
lrwxrwxrwx 1 root root 15 Mär 12 22:19 system -> system-432-link lrwxrwxrwx 1 root root 15 Nov 11 10:45 system -> system-283-link
... lrwxrwxrwx 1 root root 77 Nov 10 12:53 system-282-link -> /nix/store/jb5krdbbylwwgvxiadiv6fxja2zgc4h3-nixos-system-yodaTab-24.05pre-git
lrwxrwxrwx 1 root root 77 Mär 6 12:37 system-428-link -> /nix/store/damngdyial0i96xa46csdqk36j2njavi-nixos-system-yodaTux-23.11pre-git lrwxrwxrwx 1 root root 77 Nov 11 10:45 system-283-link -> /nix/store/jf7ml8jzxrmg9djhfr8szq2f19hxysn5-nixos-system-yodaTab-24.05pre-git
lrwxrwxrwx 1 root root 77 Mär 7 11:27 system-429-link -> /nix/store/k7c7576sz868gzjci1z6l6nzmdnpd6xr-nixos-system-yodaTux-23.11pre-git
lrwxrwxrwx 1 root root 77 Mär 10 12:48 system-430-link -> /nix/store/7468m7rgk425kb23aq222a498ynfqdkc-nixos-system-yodaTux-23.11pre-git
lrwxrwxrwx 1 root root 77 Mär 11 11:18 system-431-link -> /nix/store/r51yw36ddfxq8hdsz2mm6axpbqvjaigy-nixos-system-yodaTux-23.11pre-git
lrwxrwxrwx 1 root root 77 Mär 12 22:19 system-432-link -> /nix/store/i9pxh3ax6m0yr7xlk7y7c5xdzp74xqi4-nixos-system-yodaTux-23.11pre-git
``` ```
The currently running system. This is the currently active generation. By comparing the store path with the above output, we see that it matches generation 429. The currently running system. This is the currently active generation. By comparing the store path with the above output, we see that it matches generation 429.
@ -483,33 +474,45 @@ The currently running system. This is the currently active generation. By compar
ls -l /run/current-system ls -l /run/current-system
``` ```
```console ```console
lrwxrwxrwx 1 root root 77 Mär 9 12:44 /run/current-system -> /nix/store/k7c7576sz868gzjci1z6l6nzmdnpd6xr-nixos-system-yodaTux-23.11pre-git lrwxrwxrwx 1 root root 77 Nov 11 10:46 /run/current-system -> /nix/store/jf7ml8jzxrmg9djhfr8szq2f19hxysn5-nixos-system-yodaTab-24.05pre-git
``` ```
### Garbage collection - Keep most recent X system profiles ### Deleting generations - Keep most recent X system profiles
A NixOS config example is given in [base.nix](modules/base.nix). https://nix.dev/manual/nix/2.18/command-ref/nix-env/delete-generations
> Periodically deleting old generations is important to make garbage collection effective. The is because profiles are also garbage collection roots.
A NixOS config example is given in [nix-gc.nix](modules/nix-gc.nix).
```shell ```shell
sudo nix-env --delete-generations +7 --profile /nix/var/nix/profiles/system sudo nix-env --delete-generations +7 --profile /nix/var/nix/profiles/system
``` ```
TODO: Should we run `sudo nix-collect-garbage --delete-old` after the above? After deleting some generations, it is still necessary to collect garbage in order to free up your system. See below.
### Garbage collection - Delete system profiles older than X days ### Garbage collection - Delete unreachable store objects
https://nix.dev/manual/nix/2.18/command-ref/nix-collect-garbage
> `nix-collect-garbage` deletes all unreachable store objects in the Nix store to clean up your system.
* https://nixos.org/manual/nix/stable/package-management/garbage-collection.html * https://nixos.org/manual/nix/stable/package-management/garbage-collection.html
* https://discourse.nixos.org/t/why-doesnt-nix-collect-garbage-remove-old-generations-from-efi-menu/17592/4 * https://discourse.nixos.org/t/why-doesnt-nix-collect-garbage-remove-old-generations-from-efi-menu/17592/4
A NixOS config example is given in [base.nix](modules/base.nix). First delete unreachable store objects:
Run manually for all profiles:
```shell ```shell
sudo nix-collect-garbage --delete-older-than 14d # Delete unreachable store objects
sudo nix-collect-garbage
# Deletes all except the currently active generation prior to deleting unreachable store objects
#sudo nix-collect-garbage --delete-old
# Deletes all generations older than 14d prior to deleting unreachable store objects
#sudo nix-collect-garbage --delete-older-than 14d
``` ```
Remove leftover EFI entries of removed generations: Then remove leftover EFI entries of deleted generations:
```shell ```shell
sudo /run/current-system/bin/switch-to-configuration boot sudo /run/current-system/bin/switch-to-configuration boot

12
modules/nix-gc.nix
View File

@ -1,10 +1,11 @@
{ config, pkgs, ... }: { config, pkgs, ... }:
{ {
# Keep only the 7 most recent system generations. # Delete all system generations except the 7 most recent ones.
# Then delete all unreachable store objects.
# #
# Based on https://github.com/NixOS/nixpkgs/blob/nixos-23.11/nixos/modules/services/misc/nix-gc.nix # Based on https://github.com/NixOS/nixpkgs/blob/nixos-23.11/nixos/modules/services/misc/nix-gc.nix
#
# Alternatively: Delete generations older than 7 days # Alternative: Delete generations older than 7 days and then delete unreachable store objects
# https://nixos.wiki/wiki/Storage_optimization#Automation # https://nixos.wiki/wiki/Storage_optimization#Automation
#nix.gc = { #nix.gc = {
# automatic = true; # automatic = true;
@ -29,8 +30,10 @@
}; };
}; };
# View generated systemd service config with:
# cat "$(systemctl show -P FragmentPath nix-gc-7.service)" | grep ExecStart
systemd.services."nix-gc-7" = { systemd.services."nix-gc-7" = {
description = "Keep only the most recent 7 system generations"; description = "rm old system generations and unreachable store objects";
conflicts = [ "shutdown.target" "sleep.target" ]; conflicts = [ "shutdown.target" "sleep.target" ];
before = [ "shutdown.target" "sleep.target" ]; before = [ "shutdown.target" "sleep.target" ];
@ -45,6 +48,7 @@
script = '' script = ''
${config.nix.package.out}/bin/nix-env --delete-generations +7 --profile /nix/var/nix/profiles/system ${config.nix.package.out}/bin/nix-env --delete-generations +7 --profile /nix/var/nix/profiles/system
${config.nix.package.out}/bin/nix-collect-garbage
''; '';
}; };
} }