我正在为 keystone 部署 ha ha 集群，cluter 已启动，两个单元都显示代理状态为“已启动”，但其中一个单元显示错误为“错误：挂钩失败：“配置已更改”，我 ssh 到该单元并检查 keystone 日志也没有错误，配置看起来也正常，那么这里的错误是什么？我的意思是我应该如何排除故障？这是 juju 状态的输出，
keystone:
charm: local:precise/keystone-223
exposed: false
relations:
cluster:
- keystone
ha:
- keystone-hacluster
identity-service:
- cinder
- glance
- nova-cloud-controller
shared-db:
- mysql
units:
keystone/0:
agent-state: error
agent-state-info: 'hook failed: "config-changed"'
agent-version: 1.12.0
machine: "12"
public-address: opks02.master
subordinates:
keystone-hacluster/1:
agent-state: started
agent-version: 1.12.0
public-address: opks02.master
keystone/1:
agent-state: started
agent-version: 1.12.0
machine: "13"
public-address: opks01.master
subordinates:
keystone-hacluster/0:
agent-state: started
agent-version: 1.12.0
public-address: opks01.master
keystone-hacluster:
charm: local:precise/hacluster-67
exposed: false
relations:
ha:
- keystone
hanode:
- keystone-hacluster
subordinate-to:
- keystone