separate backend definitions in extra file

templates/kea-dhcp-backends.j2

+{% if dhcp_backend == "memfile" %}
+    "lease-database": {
+        "type": "memfile",
+        "name": "/var/db/kea/kea-leases4"
+    },
+{% elif dhcp_backend == "cassandra" %}
+    "lease-database": {
+        "type": "cql",
+        "keyspace": "{{ dhcp_db_dbname }}"
+        "contact-points": "{{ dhcp_db_host }}"
+{%   if dhcp_db_port is defined %}
+        "port": "{{ dhcp_db_port }}"
+{%   endif %}
+    },
+{% else %}
+    "lease-database": {
+        "type": "{{ dhcp_backend }}",
+        "name": "{{ dhcp_db_dbname }}",
+        "host": "{{ dhcp_db_host }}",
+{%   if dhcp_db_port is defined %}
+        "port": "{{ dhcp_db_port }}"
+{%   endif %}
+        "user": "{{ dhcp_db_user }}"
+        "password": "{{ dhcp_db_password | default("") }}"
+    },
+
+    "hosts-database": {
+        "type": "{{ dhcp_backend }}",
+        "name": "{{ dhcp_db_dbname }}",
+        "host": "{{ dhcp_db_host }}",
+{%   if dhcp_db_port is defined %}
+        "port": "{{ dhcp_db_port }}"
+{%   endif %}
+        "user": "{{ dhcp_db_user }}"
+        "password": "{{ dhcp_db_password | default("") }}"
+    },
+{% endif %}

templates/kea-dhcp4.conf.j2

@@ -12,46 +12,14 @@
         "socket-name": "/tmp/kea-dhcp4-ctrl.sock"
     },
 
-{% if dhcp_backend == "memfile" %}
-    "lease-database": {
-        "type": "memfile",
-        "name": "/var/db/kea/kea-leases4"
-    },
-{% elif dhcp_backend == "cassandra" %}
-    "lease-database": {
-        "type": "cql",
-        "keyspace": "{{ dhcp_db_dbname }}"
-        "contact-points": "{{ dhcp_db_host }}"
-{%   if dhcp_db_port is defined %}
-        "port": "{{ dhcp_db_port }}"
-{%   endif %}
-    },
-{% else %}
-    "lease-database": {
-        "type": "{{ dhcp_backend }}",
-        "name": "{{ dhcp_db_dbname }}",
-        "host": "{{ dhcp_db_host }}",
-{%   if dhcp_db_port is defined %}
-        "port": "{{ dhcp_db_port }}"
-{%   endif %}
-        "user": "{{ dhcp_db_user }}"
-        "password": "{{ dhcp_db_password | default("") }}"
-    },
-
-    "hosts-database": {
-        "type": "{{ dhcp_backend }}",
-        "name": "{{ dhcp_db_dbname }}",
-        "host": "{{ dhcp_db_host }}",
-{%   if dhcp_db_port is defined %}
-        "port": "{{ dhcp_db_port }}"
-{%   endif %}
-        "user": "{{ dhcp_db_user }}"
-        "password": "{{ dhcp_db_password | default("") }}"
-    },
-{% endif %}
+{% include "kea-dhcp-backends.j2" %}
 
     "valid-lifetime": {{ dhcp_leasetimes["default"] }},
 
+{%- if kea_ha_mode != "none" -%}
+{%    include "kea-dhcp-ha.j2" %}
+{%- endif -%}
+
 {%-   set ipv4subnets = [] -%}
 {%-   for netclassname, netclass in network.classes.items() if netclass.dhcp is defined -%}
 {%-     if netclass.dhcp.ipv4 is defined -%}