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haproxy[1387]: proxy nova_compute_api_cluster has no server available!

I want to restart the nova related services:

[root@ha-node1 nova]# systemctl restart openstack-nova-api.service openstack-nova-cert.service openstack-nova-consoleauth.service openstack-nova-scheduler.service openstack-nova-conductor.service openstack-nova-novncproxy.service

But can not start the below red or yellow status node services:

image description

The print out is below:

 [root@ha-node1 nova]# systemctl restart openstack-nova-api.service openstack-nova-cert.service openstack-nova-consoleauth.service openstack-nova-scheduler.service openstack-nova-conductor.service openstack-nova-novncproxy.service
[root@ha-node1 nova]# 
Message from syslogd@localhost at Aug  5 01:02:14 ...
 haproxy[1387]: proxy nova_compute_api_cluster has no server available!

Message from syslogd@localhost at Aug  5 01:03:17 ...
 haproxy[1387]: proxy nova_compute_api_cluster has no server available!

Message from syslogd@localhost at Aug  5 01:04:22 ...
 haproxy[1387]: proxy nova_compute_api_cluster has no server available!

Message from syslogd@localhost at Aug  5 01:05:23 ...
 haproxy[1387]: proxy nova-metadata-api_cluster has no server available!

Message from syslogd@localhost at Aug  5 01:06:15 ...
 haproxy[1387]: proxy nova_compute_api_cluster has no server available!

Message from syslogd@localhost at Aug  5 01:06:38 ...
 haproxy[1387]: proxy nova_compute_api_cluster has no server available!

Message from syslogd@localhost at Aug  5 01:06:59 ...
 haproxy[1387]: proxy nova_compute_api_cluster has no server available!

Message from syslogd@localhost at Aug  5 01:07:39 ...
 haproxy[1387]: proxy nova_compute_api_cluster has no server available!

Message from syslogd@localhost at Aug  5 01:09:01 ...
 haproxy[1387]: proxy nova_compute_api_cluster has no server available!

Message from syslogd@localhost at Aug  5 01:09:46 ...
 haproxy[1387]: proxy nova-metadata-api_cluster has no server available!