Avamar：MCS 無法啟動，並回報「無法連線至節點 rabbit@localhost：nodedown」

在管理主控台服務 （MCS） 重新啟動期間，會記錄例外訊息： (/usr/local/avamar/var/mc/server_log/mcserver.log.0)

Caused by: org.springframework.amqp.AmqpConnectException: java.net.ConnectException: Connection refused
        at org.springframework.amqp.rabbit.support.RabbitExceptionTranslator.convertRabbitAccessException(RabbitExceptionTranslator.java:51)
        at org.springframework.amqp.rabbit.connection.AbstractConnectionFactory.createBareConnection(AbstractConnectionFactory.java:185)
        at org.springframework.amqp.rabbit.connection.CachingConnectionFactory.createConnection(CachingConnectionFactory.java:228)
        at org.springframework.amqp.rabbit.connection.ConnectionFactoryUtils$1.createConnection(ConnectionFactoryUtils.java:77)
        at org.springframework.amqp.rabbit.connection.ConnectionFactoryUtils.doGetTransactionalResourceHolder(ConnectionFactoryUtils.java:125)
        at org.springframework.amqp.rabbit.connection.ConnectionFactoryUtils.getTransactionalResourceHolder(ConnectionFactoryUtils.java:67)
        at org.springframework.amqp.rabbit.connection.RabbitAccessor.getTransactionalResourceHolder(RabbitAccessor.java:102)
        at org.springframework.amqp.rabbit.core.RabbitTemplate.execute(RabbitTemplate.java:618)
        at org.springframework.amqp.rabbit.core.RabbitAdmin.declareQueue(RabbitAdmin.java:133)
        at com.avamar.mc.jms.push.JmsPushService.enable(JmsPushService.java:418)
        at com.avamar.mc.jms.push.JmsPushService.start(JmsPushService.java:191)
        at com.avamar.asn.service.ServiceContainerImpl.installService(ServiceContainerImpl.java:472)
        ... 6 more

可使用 Rabbimq 狀態報告錯誤： Unable to connect to node rabbit@localhost: nodedown

service rabbitmq-server status

Status of node rabbit@localhost ...
Error: unable to connect to node rabbit@localhost: nodedown 

備份與還原管理員 （BRM） 已啟用：

grep Brm /usr/local/avamar/var/mc/server_data/prefs/mcserver.xml

<entry key="enableBrmService" value="true" /> 

原因不明，但已於下方提供可能的因應措施。

1.以系統管理員身分登入 Avamar Utility Node。

2.提升至 root 權限。

3.重新命名 /usr/local/avamar/var/rabbitmq/mnesia 目錄：

mv /usr/local/avamar/var/rabbitmq/mnesia /usr/local/avamar/var/rabbitmq/mnesia.`date +%y%m%d` 

4.重新啟動 rabbitmq：

service rabbitmq-server start 

5.請確認 /usr/local/avamar/var/rabbitmq/mnesia 目錄存在：

ls -ld /usr/local/avamar/var/rabbitmq/mnesia* 

範例輸出：

drwxr-x--- 4 rabbitmq rabbitmq 97 Jul 21 19:46 /usr/local/avamar/var/rabbitmq/mnesia
drwxr-xr-x 4 rabbitmq rabbitmq 97 Jan 22 16:30 /usr/local/avamar/var/rabbitmq/mnesia.250721

6.根據 Avamar 重新啟動 MCS：如何重新啟動管理主控台伺服器。