flannel backend type option

README.md

@@ -283,6 +283,8 @@ node1 ansible_ssh_host=95.54.0.12 local_as=xxxxxx
 
 #### Flannel
 
+You can choose the [backend](https://github.com/coreos/flannel/blob/master/README.md) type by changing the variable **flannel_backend_type** (default: vxlan)
+
 * Flannel configuration file should have been created there
 ```
 cat /run/flannel/subnet.env

roles/network_plugin/flannel/defaults/main.yml

@@ -6,3 +6,7 @@ flannel_public_ip: "{{ access_ip|default(ip|default(ansible_default_ipv4.address
 ## interface that should be used for flannel operations
 ## This is actually an inventory node-level item
 # flannel_interface:
+
+# You can choose what type of flannel backend to use
+# please refer to flannel's docs : https://github.com/coreos/flannel/blob/master/README.md
+flannel_backend_type: "vxlan"

roles/network_plugin/flannel/templates/network.json

-{ "Network": "{{ kube_pods_subnet }}", "SubnetLen": {{ kube_network_node_prefix }}, "Backend": { "Type": "vxlan" } }
+{ "Network": "{{ kube_pods_subnet }}", "SubnetLen": {{ kube_network_node_prefix }}, "Backend": { "Type": "{{ flannel_backend_type }}" } }