nixosModules.seaweedfs: Add Seaweedfs Module

[liberodark]

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 24.11 Release Notes (or backporting 23.11 and 24.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

---

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[BonusPlay]

It looks quite ok, some initial feedback.

[liberodark]

Some information in how to use :

This is for single Node use :

# Configuration master
  services.seaweedfs.master = {
    enable = true;
    ip = "192.168.0.185";  # IP locale
    ipBind = "0.0.0.0";
    port = 9333;
    peers = [
      "192.168.0.185:9333"  # Local IP
    ];
  };

  # Configuration volume
  services.seaweedfs.volume = {
    enable = true;
    ip = "192.168.0.185";  # IP locale
    ipBind = "0.0.0.0";
    port = 8080;
    master =  [
      "192.168.0.185:9333"  # Local IP
    ];
  };

  # Configuration filer
  services.seaweedfs.filer = {
    enable = true;
    ip = "192.168.0.185";  # IP locale
    ipBind = "0.0.0.0";
    port = 8888;
    master =  [
      "192.168.0.185:9333"  # Local IP
    ];
  };

This is for multi Node use :

# In the other node (192.168.0.186)
services.seaweedfs = {
  master = {
    enable = true;
    ip = "192.168.0.186";
    ipBind = "0.0.0.0";
    port = 9333;
    peers = [
      "192.168.0.185:9333"  # First node
      "192.168.0.186:9333"  # 2 node
      "192.168.0.187:9333"  # 3 node
    ];
  };

  volume = {
    enable = true;
    ip = "192.168.0.186";
    ipBind = "0.0.0.0";
    port = 8080;
    master = [
      "192.168.0.185:9333"  # First node
      "192.168.0.186:9333"  # 2 node
      "192.168.0.187:9333"  # 3 node
    ];
  };

  filer = {
    enable = true;
    ip = "192.168.0.186";
    ipBind = "0.0.0.0";
    port = 8888;
    master = [
      "192.168.0.185:9333"  # First node
      "192.168.0.186:9333"  # 2 node
      "192.168.0.187:9333"  # 3 node
    ];
  };
};

and add in first node :

services.seaweedfs.master = {
  peers = [
    "192.168.0.185:9333"
    "192.168.0.186:9333"
    "192.168.0.187:9333"
  ];
};

For mount seaweedfs :

systemd.services.mount-seaweedfs = {
    description = "Mount SeaweedFS";
    wantedBy = [ "multi-user.target" ];
    after = [ "network-online.target" ];
    wants = [ "network-online.target" ];
    
    serviceConfig = {
      Type = "simple";
      ExecStartPre = ''
        ${pkgs.coreutils}/bin/mkdir -p /mnt/seaweedfs
        ${pkgs.coreutils}/bin/mkdir -p /var/cache/weedfs-cache
      '';
      ExecStart = ''
        ${pkgs.seaweedfs}/bin/weed mount \
          -filer=192.168.0.185:8888,192.168.0.186:8888,192.168.0.187:8888 \
          -dir=/mnt/seaweedfs \
          -allowOthers \
          -cacheDir=/var/cache/weedfs-cache \
          -cacheCapacityMB=1000
      '';
      ExecStop = "${pkgs.fuse}/bin/fusermount -u /mnt/seaweedfs";
      Restart = "always";
      RestartSec = "10s";
      User = "root";  # needed for mount
    };
  };

  # create persistant cache
  systemd.tmpfiles.rules = [
    "d /var/cache/weedfs-cache 0755 root root -"
    ];