Add NixOS configuration for john-endesktop ZFS/NFS server

Create configuration to migrate john-endesktop from Arch Linux to NixOS while maintaining existing ZFS pools (media JBOD and swarmvols mirror) and NFS exports for k3s cluster. Configuration includes: - ZFS support with automatic pool import - NFS server exporting both pools to 10.0.0.0/24 - Correct ZFS hostid (007f0101) to resolve hostid warnings - Btrfs root filesystem on nvme0n1p5 (810GB) - Comprehensive migration plan with rollback procedures The migration is designed to be safe with Arch Linux remaining bootable as a fallback until NixOS is verified stable.
2025-12-29 23:49:54 -08:00
parent c480bcdd1d
commit 8bb20bf05e
4 changed files with 592 additions and 0 deletions
--- a/machines/john-endesktop/configuration.nix
+++ b/machines/john-endesktop/configuration.nix
@@ -0,0 +1,112 @@
+# NixOS configuration for john-endesktop (ZFS/NFS server)
+# Migrated from Arch Linux to provide ZFS pools via NFS to k3s cluster
+
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+{
+  imports = [
+    ./hardware-configuration.nix
+  ];
+
+  # Boot configuration
+  boot.loader.systemd-boot.enable = true;
+  boot.loader.efi.canTouchEfiVariables = true;
+
+  # ZFS support
+  boot.supportedFilesystems = [ "zfs" ];
+  boot.zfs.forceImportRoot = false;
+  boot.zfs.extraPools = [ "media" "swarmvols" ];
+
+  # Set ZFS hostid to match current system (from Arch Linux)
+  # This resolves the hostid mismatch warnings
+  networking.hostId = "007f0101";
+
+  # Hostname
+  networking.hostName = "john-endesktop";
+
+  # Network configuration - using DHCP on enp0s31f6
+  networking.useDHCP = false;
+  networking.interfaces.enp0s31f6.useDHCP = true;
+
+  # NFS Server configuration
+  services.nfs.server = {
+    enable = true;
+
+    # NFS protocol versions
+    # v3 for broader compatibility, v4 for better performance
+    exports = ''
+      # These are managed by ZFS sharenfs properties
+      # but we enable the NFS server here
+    '';
+  };
+
+  # Enable NFS4 with proper configuration
+  services.rpcbind.enable = true;
+
+  # Firewall configuration for NFS
+  networking.firewall = {
+    enable = true;
+    allowedTCPPorts = [
+      111   # rpcbind
+      2049  # nfs
+      4000  # nfs callback
+      4001  # nlockmgr
+      4002  # mountd
+      20048 # mountd
+    ];
+    allowedUDPPorts = [
+      111   # rpcbind
+      2049  # nfs
+      4000  # nfs callback
+      4001  # nlockmgr
+      4002  # mountd
+      20048 # mountd
+    ];
+    # Allow NFS from local network
+    extraCommands = ''
+      iptables -A nixos-fw -p tcp -s 10.0.0.0/24 -j ACCEPT
+      iptables -A nixos-fw -p udp -s 10.0.0.0/24 -j ACCEPT
+    '';
+  };
+
+  # ZFS maintenance
+  services.zfs = {
+    autoScrub = {
+      enable = true;
+      interval = "monthly";
+    };
+    trim = {
+      enable = true;
+      interval = "weekly";
+    };
+  };
+
+  # Basic system packages
+  environment.systemPackages = with pkgs; [
+    vim
+    git
+    htop
+    tmux
+    zfs
+  ];
+
+  # Enable SSH
+  services.openssh = {
+    enable = true;
+    settings = {
+      PermitRootLogin = "no";
+      PasswordAuthentication = true;
+    };
+  };
+
+  # User configuration
+  roles.users.enable = true;
+
+  # Time zone
+  time.timeZone = "America/Los_Angeles"; # Adjust as needed
+
+  # NixOS version
+  system.stateVersion = "25.11";
+}