Add manage swap on the worker node

roles/kubernetes/preinstall/tasks/main.yml

 ---
+# Disable swap
+- import_tasks: swapoff.yml
+  when: disable_swap
+
 - import_tasks: verify-settings.yml
   tags:
     - asserts

roles/kubernetes/preinstall/tasks/swapoff.yml

+---
+- name: Remove swapfile from /etc/fstab
+  mount:
+    name: swap
+    fstype: swap
+    state: absent
+
+- name: Disable swap
+  command: swapoff -a
+  when: ansible_swaptotal_mb > 0

roles/kubespray-defaults/defaults/main.yaml

@@ -12,6 +12,8 @@ kube_api_anonymous_auth: false
 # Default value, but will be set to true automatically if detected
 is_atomic: false
 
+# optional disable the swap
+disable_swap: false
 
 ## Change this to use another Kubernetes version, e.g. a current beta release
 kube_version: v1.10.2