linux - rabbitmq集群主机名不匹配问题

Question

我已经部署了带有3节点rabbitmq集群的openstack-ansible，它使用lxc在顶部运行rabbitmq，当我执行rabbitmqctl status命令时，我在这里看到非常奇怪的错误，如果你注意到它与错误的节点ostack-controller-01交谈是主机节点而不是实际的rabbitmq节点..

[root@ostack-controller-01-rabbit-mq-container-1bf6ede2 ~]# rabbitmqctl status
Status of node 'rabbit@ostack-controller-01' ...
Error: unable to connect to node 'rabbit@ostack-controller-01': nodedown

DIAGNOSTICS
===========

attempted to contact: ['rabbit@ostack-controller-01']

rabbit@ostack-controller-01:
  * unable to connect to epmd (port 4369) on ostack-controller-01: address (cannot connect to host/port)

current node details:
- node name: 'rabbitmq-cli-06@ostack-controller-01-rabbit-mq-container-1bf6ede2'
- home dir: /var/lib/rabbitmq
- cookie hash: SssFdXBI7wTevePuCt5d9w==

我如何修复此行为并告诉rabbitmq与正确的主机对话，即ostack-controller-01-rabbit-mq-container-1bf6ede2

我尝试过 forget_cluster_node 但没有运气，仍然抛出相同的错误。

[root@ostack-controller-01-rabbit-mq-container-1bf6ede2 ~]# rabbitmqctl forget_cluster_node rabbit@ostack-controller-01
Removing node 'rabbit@ostack-controller-01' from cluster ...
Error: unable to connect to node 'rabbit@ostack-controller-01': nodedown

DIAGNOSTICS
===========

attempted to contact: ['rabbit@ostack-controller-01']

rabbit@ostack-controller-01:
  * unable to connect to epmd (port 4369) on ostack-controller-01: address (cannot connect to host/port)


current node details:
- node name: 'rabbitmq-cli-39@ostack-controller-01-rabbit-mq-container-1bf6ede2'
- home dir: /var/lib/rabbitmq
- cookie hash: SssFdXBI7wTevePuCt5d9w==

更新:1

[root@ostack-controller-01-rabbit-mq-container-1bf6ede2 rabbitmq]# rabbitmqctl -n rabbit@ostack-controller-01-rabbit-mq-container-1bf6ede2 status
Status of node 'rabbit@ostack-controller-01-rabbit-mq-container-1bf6ede2' ...
[{pid,8720},
 {running_applications,
     [{rabbitmq_management,"RabbitMQ Management Console","3.6.9"},
      {amqp_client,"RabbitMQ AMQP Client","3.6.9"},
      {rabbitmq_management_agent,"RabbitMQ Management Agent","3.6.9"},
      {rabbitmq_web_dispatch,"RabbitMQ Web Dispatcher","3.6.9"},
      {rabbit,"RabbitMQ","3.6.9"},
      {rabbit_common,
          "Modules shared by rabbitmq-server and rabbitmq-erlang-client",
          "3.6.9"},
      {xmerl,"XML parser","1.3.14"},
      {os_mon,"CPO  CXC 138 46","2.4.2"},
      {cowboy,"Small, fast, modular HTTP server.","1.0.4"},
      {ranch,"Socket acceptor pool for TCP protocols.","1.3.0"},
      {ssl,"Erlang/OTP SSL application","8.1.3.1.1"},
      {public_key,"Public key infrastructure","1.4"},
      {cowlib,"Support library for manipulating Web protocols.","1.0.2"},
      {crypto,"CRYPTO","3.7.4"},
      {inets,"INETS  CXC 138 49","6.3.9"},
      {compiler,"ERTS  CXC 138 10","7.0.4.1"},
      {asn1,"The Erlang ASN1 compiler version 4.0.4","4.0.4"},
      {syntax_tools,"Syntax tools","2.1.1"},
      {mnesia,"MNESIA  CXC 138 12","4.14.3.1"},
      {sasl,"SASL  CXC 138 11","3.0.3"},
      {stdlib,"ERTS  CXC 138 10","3.3"},
      {kernel,"ERTS  CXC 138 10","5.2.0.1"}]},
 {os,{unix,linux}},
 {erlang_version,
     "Erlang/OTP 19 [erts-8.3.5.4] [source] [64-bit] [smp:6:6] [async-threads:128] [hipe] [kernel-poll:true]\n"},
 {memory,
     [{total,64189296},
      {connection_readers,179280},
      {connection_writers,26568},
      {connection_channels,124504},
      {connection_other,127440},
      {queue_procs,2832},
      {queue_slave_procs,0},
      {plugins,406280},
      {other_proc,21056136},
      {mnesia,500680},
      {metrics,205984},
      {mgmt_db,127256},
      {msg_index,47416},
      {other_ets,2692192},
      {binary,1591656},
      {code,24765630},
      {atom,1033401},
      {other_system,11505193}]},
 {alarms,[]},
 {listeners,
     [{clustering,25672,"::"},
      {amqp,5672,"::"},
      {'amqp/ssl',5671,"::"},
      {http,15672,"::"}]},
 {vm_memory_high_watermark,0.4},
 {vm_memory_limit,6662953369},
 {disk_free_limit,50000000},
 {disk_free,82822516736},
 {file_descriptors,
     [{total_limit,65436},
      {total_used,5},
      {sockets_limit,58890},
      {sockets_used,3}]},
 {processes,[{limit,1048576},{used,376}]},
 {run_queue,0},
 {uptime,14},
 {kernel,{net_ticktime,60}}]

更新 - 2

这很有趣......为什么下面的命令有效但rabbitmqctl cluster_status不起作用？

[root@ostack-controller-01-rabbit-mq-container-1bf6ede2 rabbitmq]# rabbitmqctl -n rabbit@ostack-controller-01-rabbit-mq-container-1bf6ede2 cluster_status
Cluster status of node 'rabbit@ostack-controller-01-rabbit-mq-container-1bf6ede2' ...
[{nodes,
     [{disc,
          ['rabbit@ostack-controller-01-rabbit-mq-container-1bf6ede2',
           'rabbit@ostack-controller-02-rabbit-mq-container-d510bdfc',
           'rabbit@ostack-controller-03-rabbit-mq-container-c482ee13']}]},
 {running_nodes,
     ['rabbit@ostack-controller-02-rabbit-mq-container-d510bdfc',
      'rabbit@ostack-controller-03-rabbit-mq-container-c482ee13',
      'rabbit@ostack-controller-01-rabbit-mq-container-1bf6ede2']},
 {cluster_name,<<"openstack">>},
 {partitions,
     [{'rabbit@ostack-controller-02-rabbit-mq-container-d510bdfc',
          ['rabbit@ostack-controller-01-rabbit-mq-container-1bf6ede2',
           'rabbit@ostack-controller-03-rabbit-mq-container-c482ee13']},
      {'rabbit@ostack-controller-03-rabbit-mq-container-c482ee13',
          ['rabbit@ostack-controller-02-rabbit-mq-container-d510bdfc']}]},
 {alarms,
     [{'rabbit@ostack-controller-02-rabbit-mq-container-d510bdfc',[]},
      {'rabbit@ostack-controller-03-rabbit-mq-container-c482ee13',[]},
      {'rabbit@ostack-controller-01-rabbit-mq-container-1bf6ede2',[]}]}]

Answer 1

首先，RabbitMQ 3.6.9 很旧，您应该使用最新版本。

话虽如此，这不是问题。 echo $HOSTNAME 的输出是这样的:

ostack-controller-01.foo.example.com

因此，当 rabbitmqctl status 运行时，它使用 this code确定要连接的节点名称。由于设置了 HOSTNAME 变量，该变量用于确定节点名称，并且 rabbitmqctl 尝试使用 rabbit@ostack-controller-01，但失败了。

您可以继续使用 rabbitmqctl 的 -nrabbit@ostack-controller-01-rabbit-mq-container-1bf6ede2 参数来解决此问题。或者，您可以使用以下内容创建 /etc/rabbitmq/rabbitmq-env.conf 文件:

NODENAME=rabbit@ostack-controller-01-rabbit-mq-container-1bf6ede2

然后，rabbitmqctl status 和其他 rabbitmqctl 命令应该可以工作。然后，您可以在每个节点上重复此过程，并在 /etc/rabbitmq/rabbitmq-env.conf

中使用该节点的正确名称 <小时/>

_{注意: RabbitMQ 团队监控 the rabbitmq-users mailing list并且有时只在 StackOverflow 上回答问题。}