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{{FAQ/breadcrumb}}
It is possible (and indeed, fairly easy) to pin a specific version of
It is possible (and indeed, fairly easy) to pin a specific version of
Nixpkgs. This can be used to upgrade individual applications
Nixpkgs. This can be used to upgrade individual applications
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How to upgrade a single package and service to an unstable version
How to upgrade a single package and service to an unstable version


There is probably a better way, especially once flakes comes around. Some packages, let you specify which <code>package</code> to run as an option for instance.  Most don't in my experience. This is how you do it for one that doesn't.
There is probably a better way, especially once flakes come around. Some packages let you specify which <code>package</code> to run as an option but most don't. The following is a generic way that also works for those which don't.


add to configuration.nix a set allowing unstable packages.
add to configuration.nix a set allowing unstable packages.
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<syntaxhighlight lang="nix">
<syntaxhighlight lang="nix">
  environment.systemPackages = with pkgs; [
environment.systemPackages = with pkgs; [
        unstable.bind
  unstable.bind
        unstable.dnsutils
  unstable.dnsutils
        vim
  vim
  ];
];
</syntaxhighlight>
</syntaxhighlight>


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<syntaxhighlight lang="nix">
<syntaxhighlight lang="nix">
services.bind.enable = true;
services.bind.enable = true;
...
...
</syntaxhighlight>
</syntaxhighlight>


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<syntaxhighlight lang="nix">
<syntaxhighlight lang="nix">
  users.users.named =
users.users.named = {
      { uid = config.ids.uids.bind;
  uid = config.ids.uids.bind;
        description = "BIND daemon user";
  description = "BIND daemon user";
      };
};
  systemd.services.mybind = {
systemd.services.mybind = {
        description = "BIND Domain Name Server";
  description = "BIND Domain Name Server";
        unitConfig.Documentation = "man:named(8)";
  unitConfig.Documentation = "man:named(8)";
        after = [ "network.target" ];
  after = [ "network.target" ];
        wantedBy = [ "multi-user.target" ];
  wantedBy = [ "multi-user.target" ];
        preStart = ''
  preStart = ''
        mkdir -m 0755 -p /etc/bind
    mkdir -m 0755 -p /etc/bind
        if ! [ -f "/etc/bind/rndc.key" ]; then
    if ! [ -f "/etc/bind/rndc.key" ]; then
          ${pkgs.unstable.bind.out}/sbin/rndc-confgen -c /etc/bind/rndc.key -u named -a -A hmac-sha256 2>/dev/null
      ${pkgs.unstable.bind.out}/sbin/rndc-confgen -c /etc/bind/rndc.key -u named -a -A hmac-sha256 2>/dev/null
        fi
    fi
        ${pkgs.coreutils}/bin/mkdir -p /run/named
    ${pkgs.coreutils}/bin/mkdir -p /run/named
        chown named /run/named
    chown named /run/named
      '';
  '';
        serviceConfig = {
  serviceConfig = {
        ExecStart = "${pkgs.unstable.bind.out}/sbin/named -u named -4 -c /etc/bind/named.conf -f";
    ExecStart = "${pkgs.unstable.bind.out}/sbin/named -u named -4 -c /etc/bind/named.conf -f";
        ExecReload = "${pkgs.unstable.bind.out}/sbin/rndc -k '/etc/bind/rndc.key' reload";
    ExecReload = "${pkgs.unstable.bind.out}/sbin/rndc -k '/etc/bind/rndc.key' reload";
        ExecStop   = "${pkgs.unstable.bind.out}/sbin/rndc -k '/etc/bind/rndc.key' stop";
    ExecStop = "${pkgs.unstable.bind.out}/sbin/rndc -k '/etc/bind/rndc.key' stop";
      };
  };
 
};
};
</syntaxhighlight>
</syntaxhighlight>
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where all the stuff just comes from the bind services definition(which you can get from the source link on the nixos options page.)
where all the stuff just comes from the bind services definition(which you can get from the source link on the nixos options page.)
Just replace named variables, and replace <code>${pkgs.bind.out</code> with <code>${pkgs.unstable.bind.out}</code>
Just replace named variables, and replace <code>${pkgs.bind.out</code> with <code>${pkgs.unstable.bind.out}</code>
== See also ==
* [https://nix.dev/reference/pinning-nixpkgs Pinning Nixpkgs]
* [https://nix.dev/tutorials/first-steps/towards-reproducibility-pinning-nixpkgs Towards Reproducibility: Pinning Nixpkgs]
* [https://nix.dev/guides/recipes/dependency-management.html Dependency Management]
Retrieved from "https://wiki.nixos.org/wiki/FAQ/Pinning_Nixpkgs"