Keepalived: mwan3 support

Installing and Using OpenWrt
1

Hello,
I'm trying keepalived configuration to implement HA between 2 different boxes.

When a machine goes down, keepalived correctly moves the virtual IP address between the 2 nodes and also the firewall rules.
Still, mwan3 configuration is not synced.

So I've created a file named /etc/hotplug.d/keepalived/600mwan3 with the following content:

#!/bin/sh
# shellcheck source=/dev/null
. /lib/functions/keepalived/hotplug.sh
set_service_name mwan3
set_restart_if_master
set_stop_if_backup
add_sync_file /etc/config/mwan3
keepalived_hotplug

The config file is synced by rsync inside /usr/share/keepalived/rsync/etc/config/mwan3, but the config is not moved to /etc/config/mwan3 when the node becomes master. Nor mwan is restarted.

What is a correct configuration for mwan3?

This is my configuration:

! Configuration file for keepalived (autogenerated via init script)
! Written Wed Feb 12 15:33:13 2025

global_defs {
	script_user root
	enable_script_security
	process_names
	startup_script "/bin/busybox env -i ACTION=startup /sbin/hotplug-call keepalived"
	startup_script_timeout 10
	shutdown_script "/bin/busybox env -i ACTION=shutdown /sbin/hotplug-call keepalived"
	shutdown_script_timeout 10
}

static_ipaddress {
	192.168.100.240 dev br-lan label br-lan:ha
}

static_routes {
}

vrrp_script ha_sync {
	script /etc/keepalived/scripts/rsync.sh
	interval 60
	weight 100
}

vrrp_instance master {
	authentication {
		auth_type PASS
		auth_pass 0f70fd3f
	}
	state MASTER
	interface eth2
	unicast_src_ip 10.12.12.1
	virtual_router_id 100
	priority 100
	advert_int 1
	nopreempt
	notify_backup "/bin/busybox env -i ACTION=NOTIFY_BACKUP TYPE=INSTANCE NAME=master /sbin/hotplug-call keepalived"
	notify_master "/bin/busybox env -i ACTION=NOTIFY_MASTER TYPE=INSTANCE NAME=master /sbin/hotplug-call keepalived"
	notify_fault "/bin/busybox env -i ACTION=NOTIFY_FAULT TYPE=INSTANCE NAME=master /sbin/hotplug-call keepalived"
	notify_stop "/bin/busybox env -i ACTION=NOTIFY_STOP TYPE=INSTANCE NAME=master /sbin/hotplug-call keepalived"
	virtual_ipaddress {
		192.168.100.240 dev br-lan label br-lan:ha
	}
	track_script {
		ha_sync weight 100 
	}
	track_interface {
		br-lan weight 100
	}
	unicast_peer {
		10.12.12.2
	}
}

Trying to cite some of the authors of the package: @feckert @stintel

Thanks in advance!