diff --git a/Vagrantfile b/Vagrantfile
index 785104cc..cb2dcb76 100644
--- a/Vagrantfile
+++ b/Vagrantfile
@@ -32,8 +32,11 @@ def provision(vm, role, node_num)
       # Required to use the private network configured above
       extra_server_args: "--node-external-ip #{node_ip} --flannel-iface eth1", 
       extra_agent_args: "--node-external-ip #{node_ip} --flannel-iface eth1",
-      # Not needed, left as reference for ruby-ansible list syntax
+      # Optional, left as reference for ruby-ansible syntax
       # extra_service_envs: [ "NO_PROXY='localhost'" ],
+      # config_yaml: <<~YAML
+      #   write-kubeconfig-mode: 644
+      # YAML
     }
   end
 end
diff --git a/inventory-sample.yml b/inventory-sample.yml
index ce96dfd2..af09a861 100644
--- a/inventory-sample.yml
+++ b/inventory-sample.yml
@@ -27,3 +27,7 @@ k3s_cluster:
     # List of locally available manifests to apply to the cluster, useful for PVCs or Traefik modifications.
     # Manifests should be either full paths or relative to the playbook directory.
     # extra_manifests: [ '/path/to/manifest1.yaml', '/path/to/manifest2.yaml' ]
+    # config_yaml:  |
+      # This is now an inner yaml file. Mantain the indentation.
+      # YAML here will be placed as the content of /etc/rancher/k3s/config.yaml
+      # See https://docs.k3s.io/installation/configuration#configuration-file
diff --git a/roles/prereq/tasks/main.yml b/roles/prereq/tasks/main.yml
index 7135495b..4ad97262 100644
--- a/roles/prereq/tasks/main.yml
+++ b/roles/prereq/tasks/main.yml
@@ -187,3 +187,17 @@
         dest: "/var/lib/rancher/k3s/server/manifests"
         mode: 0600
       loop: "{{ extra_manifests }}"
+
+- name: Setup optional config file
+  when: config_yaml is defined
+  block:
+    - name: Make config directory
+      ansible.builtin.file:
+        path: "/etc/rancher/k3s"
+        mode: 0755
+        state: directory
+    - name: Copy config values
+      ansible.builtin.copy:
+        content: "{{ config_yaml }}"
+        dest: "/etc/rancher/k3s/config.yaml"
+        mode: 0644