diff --git a/nixos/big_data.nix b/nixos/big_data.nix
index 3d61957..44e8aeb 100644
--- a/nixos/big_data.nix
+++ b/nixos/big_data.nix
@@ -92,8 +92,44 @@ in
         nodemanager.enable = true;
       };
     };
+
+    kerberos_server = {
+      enable = true;
+      realms."ATHENA.MIT.EDU" = {
+        acl = [
+          { access = "all"; principal = "*/admin"; }
+          { access = "all"; principal = "admin"; }
+        ];
+      };
+    };
   };
 
+  krb5 = {
+    enable = true;
+    realms."ATHENA.MIT.EDU" = {
+      admin_server = "localhost";
+      kdc = [
+        "localhost"
+      ];
+      kpasswd_server = "localhost";
+    };
+    domain_realm = {
+      ".athena.mit.edu" = "ATHENA.MIT.EDU";
+      "athena.mit.edu" = "ATHENA.MIT.EDU";
+    };
+    libdefaults = {
+      default_realm = "ATHENA.MIT.EDU";
+      dns_lookup_realm = false;
+      dns_lookup_kdc = false;
+    };
+    extraConfig = ''
+      [logging]
+        default = FILE:/var/log/krb5.log
+    '';
+  };
+
+
+
   systemd.services.spark-history = {
     path = with pkgs; [ procps openssh nettools ];
     description = "spark history service.";
diff --git a/odin.nix b/odin.nix
index c5df576..528bf04 100644
--- a/odin.nix
+++ b/odin.nix
@@ -45,7 +45,6 @@
       ark
       authy
       bitwarden
-      blender
       btop
       catgirl # IRC
       cava