T5480: Ability to disable SNMP for keepalived service VRRP

By default we enable `--snmp` for keepalived unit service
Add ability to disable it

set high-availability vrrp disable-snmp

(cherry picked from commit 5ae730a52de2f284e45cd433bb0cf66c8508f2f7)

3 files changed, 26 insertions, 2 deletions

diff --git a/src/etc/systemd/system/keepalived.service.d/override.conf b/data/templates/high-availability/10-override.conf.j2
index d91a824b9..d1cb25581 100644
--- a/src/etc/systemd/system/keepalived.service.d/override.conf
+++ b/data/templates/high-availability/10-override.conf.j2
@@ -1,3 +1,5 @@
+### Autogenerated by ${vyos_conf_scripts_dir}/high-availability.py ###
+{% set snmp = '' if vrrp.disable_snmp is vyos_defined else '--snmp' %}
 [Unit]
 After=vyos-router.service
 # Only start if there is our configuration file - remove Debian default
@@ -10,5 +12,5 @@ KillMode=process
 Type=simple
 # Read configuration variable file if it is present
 ExecStart=
-ExecStart=/usr/sbin/keepalived --use-file /run/keepalived/keepalived.conf --pid /run/keepalived/keepalived.pid --dont-fork --snmp
+ExecStart=/usr/sbin/keepalived --use-file /run/keepalived/keepalived.conf --pid /run/keepalived/keepalived.pid --dont-fork {{ snmp }}
 PIDFile=/run/keepalived/keepalived.pid
diff --git a/interface-definitions/high-availability.xml.in b/interface-definitions/high-availability.xml.in
index 4f55916fa..47a772d04 100644
--- a/interface-definitions/high-availability.xml.in
+++ b/interface-definitions/high-availability.xml.in
@@ -12,6 +12,12 @@
           <help>Virtual Router Redundancy Protocol settings</help>
         </properties>
         <children>
+          <leafNode name="disable-snmp">
+            <properties>
+              <valueless/>
+              <help>Disable SNMP</help>
+            </properties>
+          </leafNode>
           <node name="global-parameters">
             <properties>
               <help>VRRP global parameters</help>
diff --git a/src/conf_mode/high-availability.py b/src/conf_mode/high-availability.py
index 0121df11c..e24670417 100755
--- a/src/conf_mode/high-availability.py
+++ b/src/conf_mode/high-availability.py
@@ -15,6 +15,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 
+import os
 import time
 
 from sys import exit
@@ -24,6 +25,7 @@ from ipaddress import IPv6Interface
 
 from vyos.base import Warning
 from vyos.config import Config
+from vyos.configdict import leaf_node_changed
 from vyos.ifconfig.vrrp import VRRP
 from vyos.template import render
 from vyos.template import is_ipv4
@@ -35,6 +37,9 @@ from vyos import airbag
 airbag.enable()
 
 
+systemd_override = r'/run/systemd/system/keepalived.service.d/10-override.conf'
+
+
 def get_config(config=None):
     if config:
         conf = config
@@ -54,6 +59,9 @@ def get_config(config=None):
     if conf.exists(conntrack_path):
         ha['conntrack_sync_group'] = conf.return_value(conntrack_path)
 
+    if leaf_node_changed(conf, base + ['vrrp', 'disable-snmp']):
+        ha.update({'restart_required': {}})
+
     return ha
 
 def verify(ha):
@@ -164,13 +172,17 @@ def verify(ha):
 
 def generate(ha):
     if not ha or 'disable' in ha:
+        if os.path.isfile(systemd_override):
+            os.unlink(systemd_override)
         return None
 
     render(VRRP.location['config'], 'high-availability/keepalived.conf.j2', ha)
+    render(systemd_override, 'high-availability/10-override.conf.j2', ha)
     return None
 
 def apply(ha):
     service_name = 'keepalived.service'
+    call('systemctl daemon-reload')
     if not ha or 'disable' in ha:
         call(f'systemctl stop {service_name}')
         return None
@@ -187,7 +199,11 @@ def apply(ha):
                     if is_ipv6_tentative(interface, ipv6_address):
                         time.sleep(interval)
 
-    call(f'systemctl reload-or-restart {service_name}')
+    systemd_action = 'reload-or-restart'
+    if 'restart_required' in ha:
+        systemd_action = 'restart'
+
+    call(f'systemctl {systemd_action} {service_name}')
     return None
 
 if __name__ == '__main__':