networkd: compensate a changed default of systemd

networkd/tasks/bond.yml

@@ -14,6 +14,13 @@
   copy:
     content: "8021q"
     dest: /etc/modules-load.d/bond.conf
+- name: ensure systemd does not override a default option
+  template:
+    src: modprobe.conf.j2
+    dest: /etc/modprobe.d/systemd-override.conf
+    owner: root
+    group: root
+    mode: '0644'
 - name: ensure bond netdev is configured
   template:
     src: bond.netdev.j2

networkd/templates/modprobe.conf.j2

+# since buster systemd sets max_bonds=0
+# but we have configured bonding quite heavily
+# internet says that 1 is default
+options bonding max_bonds=1