sysctl_additional (#9351)

roles/kubespray-defaults/defaults/main.yaml

@@ -487,6 +487,12 @@ kubelet_rotate_server_certificates: false
 # If set to true, kubelet errors if any of kernel tunables is different than kubelet defaults
 kubelet_protect_kernel_defaults: true
 
+# Set additional sysctl variables to modify Linux kernel variables, for example:
+# additional_sysctl:
+#  - { name: kernel.pid_max, value: 131072 }
+#
+additional_sysctl: []
+
 ## List of key=value pairs that describe feature gates for
 ## the k8s cluster.
 kube_feature_gates: []