Add kubernetes client.

nix/configuration/configuration.nix

@@ -40,6 +40,7 @@
     ./roles/ssh
     ./roles/python
     ./roles/docker
+    ./roles/kubernetes
   ];
 
   nix.settings.experimental-features = [

nix/configuration/roles/kubernetes/default.nix

@@ -0,0 +1,43 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+let
+  alias_kx = pkgs.writeShellScriptBin "kx" ''
+    exec ${pkgs.kubeswitch}/bin/switcher "''${@}"
+  '';
+  alias_ks = pkgs.writeShellScriptBin "ks" ''
+    exec ${pkgs.kubeswitch}/bin/switcher namespace "''${@}"
+  '';
+  alias_k = pkgs.writeShellScriptBin "k" ''
+    exec ${pkgs.kubectl}/bin/kubectl "''${@}"
+  '';
+  alias_ka = pkgs.writeShellScriptBin "ka" ''
+    exec ${pkgs.kubectl}/bin/kubectl "''${@}" --all-namespaces
+  '';
+  alias_kdel = pkgs.writeShellScriptBin "kdel" ''
+    exec ${pkgs.kubectl}/bin/kubectl delete --all "''${@}"
+  '';
+  alias_kd = pkgs.writeShellScriptBin "kd" ''
+    export KUBECTL_EXTERNAL_DIFF="${pkgs.colordiff}/bin/colordiff -N -u"
+    exec ${pkgs.kubectl}/bin/kubectl diff "''${@}"
+  '';
+in
+{
+  imports = [ ];
+
+  environment.systemPackages = with pkgs; [
+    kubectl
+    kubeswitch
+    stern
+    alias_kx
+    alias_ks
+    alias_k
+    alias_ka
+    alias_kdel
+    alias_kd
+  ];
+}