initrd.network: support predictable interface names #47664
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When `initrd.network.enable` and `networking.usePredictableInterfaceNames` are enabled, apply predictable interface naming in initrd. This also fixes a bug: Previously, setting `initrd.network.enable` effectively disabled option `networking.usePredictableInterfaceNames`. Reason: Interfaces brought up in initrd are not renamed by udev in boot stage 2. So the unpredictable names assigned in initrd remained unchanged after booting. Implementation notes: udhcpc uses eth0 as the default interface. When predictable names are enabled, use the lexicographically first Ethernet interface (en*) instead.
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I did that in #39329 but there was no consensus on how to avoid breaking existing configurations, so it wasn't merged yet. |
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Great, thanks for the heads-up. I think some aspects of this PR are worth copying to your proposal:
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Mic92
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Oct 2, 2018
| @@ -76,6 +76,11 @@ in | |||
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| boot.initrd.kernelModules = [ "af_packet" ]; | |||
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| boot.initrd.extraUdevRulesCommands = mkIf config.networking.usePredictableInterfaceNames '' | |||
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Can you write release notes for that?
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This aligns more with the semantics of the option, but requires users to migrate.
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#39329 contains some draft release notes, feel free to copy/adapt.
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Any updates on this pull request, please? |
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This pull request has been mentioned on NixOS Discourse. There might be relevant details there: https://discourse.nixos.org/t/predictable-network-interface-names-in-initrd/4055/1 |
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Superseded by #68953. |
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Copy of main commit msg:
When
initrd.network.enableandnetworking.usePredictableInterfaceNamesare enabled, apply predictable interface naming in initrd.
This also fixes a bug:
Previously, setting
initrd.network.enableeffectively disabled optionnetworking.usePredictableInterfaceNames.Reason: Interfaces brought up in initrd are not renamed by udev in boot
stage 2. So the unpredictable names assigned in initrd remained
unchanged after booting.
Implementation notes:
udhcpc uses eth0 as the default interface.
When predictable names are enabled, use the lexicographically
first Ethernet interface (en*) instead.
Things done: