keepalived track_script parece não funcionar

Espero que alguém possa ver o que estou fazendo de errado e oferecer ajuda para executar um track_script keepalived.

Eu tenho a prioridade definida como 101 na vrrp_instance da caixa principal de keepalived e 100 na caixa de failover. Desconectar a rede ou interromper o keepalived na caixa principal faz com que o VIP mude para a caixa secundária conforme o esperado.

Se o script fosse executado, eu esperaria que ele adicionasse 2 à prioridade, se o script retornasse com sucesso. No entanto tcpdump, sempre mostra a prioridade inalterada. Mesmo se eu colocar uma configuração falsa na definição do script, nunca vejo nada sobre o script em /var/log/messages sobre ele. Parar o serviço HAProxy não tem nenhum efeito, e outros testes que fiz com o script indicam que ele nunca é executado.

saída de tcpdump:

172.18.8.2 > 224.0.0.18: vrrp 172.18.8.2 > 224.0.0.18: VRRPv2, Advertisement, vrid 51, prio 101, authtype simple, intvl 1s, length 20, addrs: 172.18.8.4 auth "password"

Aqui está a configuração do Keepalived:

global_defs {
   router_id BETAPROXYSLC01
}

vrrp_script chk_haproxy {
        script "killall -0 haproxy"
        interval 2
        weight 2
}

vrrp_instance VI_1 {
    state BACKUP
    interface eth0
    virtual_router_id 51
    priority 101
    advert_int 1
    notify /usr/local/bin/notify.sh
    authentication {
        auth_type PASS
        auth_pass password
    }
    virtual_ipaddress {
        172.18.8.4
    }
   track_script{
        chk_haproxy
    }
}

Aqui está o log de iniciar o keepalived com "-D -d":

Oct 15 11:50:31 BETAPROXYSLC01 systemd: Starting LVS and VRRP High Availability Monitor...
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived[2702]: Starting Keepalived v1.2.10 (06/10,2014)
Oct 15 11:50:31 BETAPROXYSLC01 systemd: Started LVS and VRRP High Availability Monitor.
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived[2703]: Starting Healthcheck child process, pid=2704
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived[2703]: Starting VRRP child process, pid=2705
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_healthcheckers[2704]: Netlink reflector reports IP 172.18.8.2 added
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_healthcheckers[2704]: Netlink reflector reports IP fe80::215:5dff:fe01:108 added
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_healthcheckers[2704]: Registering Kernel netlink reflector
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_healthcheckers[2704]: Registering Kernel netlink command channel
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_healthcheckers[2704]: Opening file '/etc/keepalived/keepalived.conf'.
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_healthcheckers[2704]: Configuration is using : 6133 Bytes
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_healthcheckers[2704]: ------< Global definitions >------
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_healthcheckers[2704]: Router ID = BETAPROXYSLC01
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_healthcheckers[2704]: Smtp server connection timeout = 30
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_healthcheckers[2704]: Email notification from = root@betaproxyslc01
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_vrrp[2705]: Netlink reflector reports IP 172.18.8.2 added
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_vrrp[2705]: Netlink reflector reports IP fe80::215:5dff:fe01:108 added
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_vrrp[2705]: Registering Kernel netlink reflector
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_vrrp[2705]: Registering Kernel netlink command channel
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_vrrp[2705]: Registering gratuitous ARP shared channel
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_vrrp[2705]: Opening file '/etc/keepalived/keepalived.conf'.
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_vrrp[2705]: Configuration is using : 63558 Bytes
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_vrrp[2705]: ------< Global definitions >------
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_vrrp[2705]: Router ID = BETAPROXYSLC01
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_vrrp[2705]: Smtp server connection timeout = 30
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_vrrp[2705]: Email notification from = root@betaproxyslc01
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_vrrp[2705]: VRRP IPv4 mcast group = 224.0.0.18
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_vrrp[2705]: VRRP IPv6 mcast group = 224.0.0.18
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_vrrp[2705]: SNMP Trap disabled
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_vrrp[2705]: ------< VRRP Topology >------
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_vrrp[2705]: VRRP Instance = VI_1
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_vrrp[2705]: Want State = BACKUP
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_vrrp[2705]: Runing on device = eth0
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_vrrp[2705]: Virtual Router ID = 51
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_vrrp[2705]: Priority = 101
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_vrrp[2705]: Advert interval = 1sec
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_vrrp[2705]: Authentication type = SIMPLE_PASSWORD
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_vrrp[2705]: Password = password
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_vrrp[2705]: Virtual IP = 1
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_vrrp[2705]: 172.18.8.4/32 dev eth0 scope global
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_vrrp[2705]: Generic state transition script = '/usr/local/bin/notify.sh'
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_vrrp[2705]: ------< VRRP Scripts >------
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_vrrp[2705]: VRRP Script = chk_haproxy
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_vrrp[2705]: Command = /usr/local/bin/chk_haproxy
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_vrrp[2705]: Interval = 2 sec
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_vrrp[2705]: Timeout = 0 sec
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_vrrp[2705]: Weight = 2
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_vrrp[2705]: Rise = 1
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_vrrp[2705]: Fall = 1
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_vrrp[2705]: Status = INIT
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_vrrp[2705]: Using LinkWatch kernel netlink reflector...
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_vrrp[2705]: VRRP_Instance(VI_1) Entering BACKUP STATE
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_vrrp[2705]: VRRP sockpool: [ifindex(2), proto(112), unicast(0), fd(10,11)]
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_healthcheckers[2704]: VRRP IPv4 mcast group = 224.0.0.18
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_healthcheckers[2704]: VRRP IPv6 mcast group = 224.0.0.18
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_healthcheckers[2704]: SNMP Trap disabled
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_healthcheckers[2704]: ------< SSL definitions >------
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_healthcheckers[2704]: Using autogen SSL context
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_healthcheckers[2704]: Using LinkWatch kernel netlink reflector...
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_vrrp[2705]: VRRP_Instance(VI_1) forcing a new MASTER election
Oct 15 11:50:31 BETAPROXYSLC01 Keepalived_vrrp[2705]: VRRP_Instance(VI_1) forcing a new MASTER election
Oct 15 11:50:32 BETAPROXYSLC01 Keepalived_vrrp[2705]: VRRP_Instance(VI_1) Transition to MASTER STATE
Oct 15 11:50:33 BETAPROXYSLC01 Keepalived_vrrp[2705]: VRRP_Instance(VI_1) Entering MASTER STATE
Oct 15 11:50:33 BETAPROXYSLC01 Keepalived_vrrp[2705]: VRRP_Instance(VI_1) setting protocol VIPs.
Oct 15 11:50:33 BETAPROXYSLC01 Keepalived_vrrp[2705]: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 172.18.8.4
Oct 15 11:50:33 BETAPROXYSLC01 avahi-daemon[510]: Registering new address record for 172.18.8.4 on eth0.IPv4.
Oct 15 11:50:33 BETAPROXYSLC01 Keepalived_healthcheckers[2704]: Netlink reflector reports IP 172.18.8.4 added
Oct 15 11:50:38 BETAPROXYSLC01 Keepalived_vrrp[2705]: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 172.18.8.4