Add configs for a new kubernetes cluster on NixOS.

nix/kubernetes/roles/zrepl/default.nix

@@ -0,0 +1,55 @@
+{
+  config,
+  lib,
+  ...
+}:
+
+{
+  imports = [ ];
+
+  options.me = {
+    zrepl.enable = lib.mkOption {
+      type = lib.types.bool;
+      default = false;
+      example = true;
+      description = "Whether we want to install zrepl.";
+    };
+  };
+
+  config = lib.mkIf config.me.zrepl.enable {
+    services.zrepl = {
+      enable = true;
+      settings = {
+        jobs = [
+          {
+            name = "snapjob";
+            type = "snap";
+            filesystems = {
+              "zroot/linux/nix/persist<" = true;
+              "zroot/bridge<" = true;
+            };
+            snapshotting = {
+              type = "periodic";
+              interval = "15m";
+              prefix = "zrepl_";
+            };
+            pruning = {
+              keep = [
+                {
+                  type = "grid";
+                  grid = "1x1h(keep=all) | 24x1h | 14x1d";
+                  regex = "^zrepl_.*";
+                }
+                {
+                  type = "regex";
+                  negate = true;
+                  regex = "^zrepl_.*";
+                }
+              ];
+            };
+          }
+        ];
+      };
+    };
+  };
+}