升级RabbitMQ至3.11.12后无法建立AMQP连接求助

昨晚Plesk服务将RabbitMQ服务器从3.11.11-1版本自动升级至3.11.12-1版本后，出现远程AMQP连接问题，服务器拒绝所有连接尝试，错误日志如下：

2023-03-31 06:26:04.674063+02:00 [error] <0.763.0> closing AMQP connection <0.763.0> (192.168.245.66:40692 -> 192.168.245.66:5672):
2023-03-31 06:26:04.674063+02:00 [error] <0.763.0> {handshake_error,opening,0,
2023-03-31 06:26:04.674063+02:00 [error] <0.763.0>     {error,badarg,'connection.open',
2023-03-31 06:26:04.674063+02:00 [error] <0.763.0>         [{ets,lookup_element,
2023-03-31 06:26:04.674063+02:00 [error] <0.763.0>              [ranch_server,{listener_sup,{acceptor,{0,0,0,0,0,0,0,0},5672}},2],
2023-03-31 06:26:04.674063+02:00 [error] <0.763.0>              [{error_info,#{cause => badkey,module => erl_stdlib_errors}}]},
2023-03-31 06:26:04.674063+02:00 [error] <0.763.0>          {ranch_server,get_listener_sup,1,
2023-03-31 06:26:04.674063+02:00 [error] <0.763.0>              [{file,"src/ranch_server.erl"},{line,122}]},
2023-03-31 06:26:04.674063+02:00 [error] <0.763.0>          {ranch,info,1,[{file,"src/ranch.erl"},{line,434}]},
2023-03-31 06:26:04.674063+02:00 [error] <0.763.0>          {rabbit_reader,is_over_node_connection_limit,1,
2023-03-31 06:26:04.674063+02:00 [error] <0.763.0>              [{file,"rabbit_reader.erl"},{line,1329}]},
2023-03-31 06:26:04.674063+02:00 [error] <0.763.0>          {rabbit_reader,handle_method0,2,
2023-03-31 06:26:04.674063+02:00 [error] <0.763.0>              [{file,"rabbit_reader.erl"},{line,1225}]},
2023-03-31 06:26:04.674063+02:00 [error] <0.763.0>          {rabbit_reader,handle_method0,3,
2023-03-31 06:26:04.674063+02:00 [error] <0.763.0>              [{file,"rabbit_reader.erl"},{line,1128}]},
2023-03-31 06:26:04.674063+02:00 [error] <0.763.0>          {rabbit_reader,handle_input,3,
2023-03-31 06:26:04.674063+02:00 [error] <0.763.0>              [{file,"rabbit_reader.erl"},{line,1032}]},
2023-03-31 06:26:04.674063+02:00 [error] <0.763.0>          {rabbit_reader,recvloop,4,[{file,"rabbit_reader.erl"},{line,472}]}]}}

解决步骤 #

• 重启RabbitMQ服务：优先通过全重启消除升级后的状态残留。使用systemd命令：

  systemctl stop rabbitmq-server
  systemctl start rabbitmq-server
  

  或者在Plesk面板操作：进入「工具与设置」→「服务管理」，找到RabbitMQ服务执行重启。
• 检查监听器状态：通过CLI工具确认端口监听情况，执行rabbitmq-diagnostics listeners，输出中需包含amqp协议绑定到0.0.0.0:5672或目标IP端口。
• 回滚至稳定版本：若重启无效，直接降级到3.11.11-1版本：
  • Debian/Ubuntu系统：

    apt install rabbitmq-server=3.11.11-1
    apt-mark hold rabbitmq-server
    

  • CentOS/RHEL系统：

    yum downgrade rabbitmq-server-3.11.11-1
    yum versionlock rabbitmq-server
    

• 验证连接限制配置：检查连接数上限是否合理，执行rabbitmqctl environment | grep connection.max，或查看/etc/rabbitmq/rabbitmq.conf中的connection.max参数，确保值未被错误设置为0或极小值。
• 排查Ranch库状态：错误日志指向底层网络库Ranch的ETS查询失败，重启服务未解决的话，可确认升级过程中Ranch依赖是否完整，或清理Erlang临时缓存（重启服务已覆盖此操作，集群环境需确保所有节点同步重启）。

内容的提问来源于stack exchange，提问作者detlefR