Merge pull request #2485 from LuckySB/flannel_iface_regexp

Add --iface-regex options to flannel

roles/network_plugin/flannel/defaults/main.yml

@@ -5,9 +5,15 @@
 # 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
+## This is actually an inventory cluster-level item
 # flannel_interface:
 
+## Select interface that should be used for flannel operations by regexp on Name or IP
+## This is actually an inventory cluster-level item
+## example: select interface with ip from net 10.0.0.0/23
+## single quote and escape backslashes
+# flannel_interface_regexp: '10\\.0\\.[0-2]\\.\\d{1,3}'
+
 # 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/cni-flannel.yml.j2

@@ -66,7 +66,7 @@ spec:
           requests:
             cpu: {{ flannel_cpu_requests }}
             memory: {{ flannel_memory_requests }}
-        command: [ "/opt/bin/flanneld", "--ip-masq", "--kube-subnet-mgr"{% if flannel_interface is defined %}, "--iface={{ flannel_interface }}"{% endif %} ]
+        command: [ "/opt/bin/flanneld", "--ip-masq", "--kube-subnet-mgr"{% if flannel_interface is defined %}, "--iface={{ flannel_interface }}"{% endif %}{% if flannel_interface_regexp is defined %}, "--iface-regex={{ flannel_interface_regexp }}"{% endif %} ]
         securityContext:
           privileged: true
         env: