RabbitMQ问题解决：TCP connection succeeded but Erlang distribution failed

说明

本来是要先把Hystrix 仪表盘更完的，但是出现了Turbine、Dashboard、RabbitMQ整合实现监控。

所以先在学RabbitMq的基本操作，在安装过程中出现了

E:\RabbitMQ Server\rabbitmq_server-3.6.5\sbin>rabbitmqctl status

Status of node 'rabbit@DESKTOP-T5RBR6M' ...

Error: unable to connect to node 'rabbit@DESKTOP-T5RBR6M': nodedown

DIAGNOSTICS

===========

attempted to contact: ['rabbit@DESKTOP-T5RBR6M']

rabbit@DESKTOP-T5RBR6M:

  * connected to epmd (port 4369) on DESKTOP-T5RBR6M

  * epmd reports node 'rabbit' running on port 25672

  * TCP connection succeeded but Erlang distribution failed

  * suggestion: hostname mismatch?

  * suggestion: is the cookie set correctly?

  * suggestion: is the Erlang distribution using TLS?

current node details:

- node name: 'rabbitmq-cli-27@DESKTOP-T5RBR6M'

- home dir: C:\Users\Administrator

- cookie hash: +Xg8GwzCRQiqRrJZqqF30A==

重点在TCP connection succeeded but Erlang distribution failed、suggestion: is the cookie set correctly?这两行，在网上看了两个小时了，发现很多都是不明所以弄成了就随便捊一下就写。。

有一些现在没有suggestion的输出，这不是很重要，这里我先恢复事故现场，大家一起踩坑

WorkArounds

问题复现

分别安装 Erlang (otp_win64_20.3.exe) 、RabbitMQ Server(rabbitmq-server-3.7.5.exe)

这里为了能看清晰问题是出在安装目录上还是其它，都装到D盘，其他不变

安装完成在菜单栏中会有这个显示，这里用win10演示（公司电脑）

查看服务，服务已经正常启动

cmd命令cd到D:\RabbitMQ Server\rabbitmq_server-3.7.5\sbin （你实际的安装位置）

小提示：如果是默认的安装位置，用可以直接定位到sbin下

输入rabbitmqctl status

D:\RabbitMQ Server\rabbitmq_server-3.7.5\sbin>rabbitmqctl status

Status of node rabbit@DESKTOP-T5RBR6M ...

Error: unable to perform an operation on node 'rabbit@DESKTOP-T5RBR6M'. Please see diagnostics information and suggestions below.

Most common reasons for this are:

 * Target node is unreachable (e.g. due to hostname resolution, TCP connection or firewall issues)

 * CLI tool fails to authenticate with the server (e.g. due to CLI tool's Erlang cookie not matching that of the server)

 * Target node is not running

In addition to the diagnostics info below:

 * See the CLI, clustering and networking guides on http://rabbitmq.com/documentation.html to learn more

 * Consult server logs on node rabbit@DESKTOP-T5RBR6M

DIAGNOSTICS

===========

attempted to contact: ['rabbit@DESKTOP-T5RBR6M']

rabbit@DESKTOP-T5RBR6M:

  * connected to epmd (port 4369) on DESKTOP-T5RBR6M

  * epmd reports node 'rabbit' uses port 25672 for inter-node and CLI tool traffic

  * TCP connection succeeded but Erlang distribution failed

  * Authentication failed (rejected by the remote node), please check the Erlang cookie

Current node details:

 * node name: 'rabbitmqcli49@DESKTOP-T5RBR6M'

 * effective user's home directory: C:\Users\Administrator

 * Erlang cookie hash: joVCp1tjZbhK/nWhgoYyjQ==

问题复现。

Authentication failed (rejected by the remote node), please check the Erlang cookie是重点，说明cookie可能有问题。

问题解决

这里直接告诉大家问题出在哪吧，是Erlang新版本的cookie位置换了！

两种解决办法：

使用旧版本Erlang
cookie替换到正确的位置

打开路径C:\Windows\System32\config\systemprofile

我们看到了这里有一个.erlang.cookie，复制这个文件到C:\Users\你的用户名下

如果没有这个文件，请打开菜单栏的Erlang快捷方式，出现白色窗口的时候，C:\Windows\System32\config\systemprofile这个目录下就会出现这个文件，可能会慢一些耐心等

要确保`C:\Windows\System32\config\systemprofile`和`C:\Users\你的用户名`下的cookie是同一个文件！

替换完成后，无需重启服务，直接rabbitmqctl status，如图这样就成功了。

以上