错误：无法在节点“rabbit@localhost”上执行操作

Question

所以我对 docker-compose 和rabbitmq 有疑问。

我运行 docker-compose up。一切都开始旋转。 Docker-compose：

services:
  rabbitmq3:
    image: "rabbitmq:3-management"
    hostname: "localhost"
    command: rabbitmq-server
    ports:
      - 5672:5672
      - 15672:15672

然后我执行

sudo rabbitmqctl status

检查与节点的连接。我收到此错误：

Error: unable to perform an operation on node 'rabbit@localhost'. 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 https://rabbitmq.com/documentation.html to learn more
 * Consult server logs on node rabbit@localhost
 * If target node is configured to use long node names, don't forget to use --longnames with CLI tools

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

attempted to contact: [rabbit@localhost]

rabbit@localhost:
  * connected to epmd (port 4369) on localhost
  * epmd reports: node 'rabbit' not running at all
                  no other nodes on localhost
  * suggestion: start the node

Current node details:
 * node name: 'rabbitmqcli-25456-rabbit@localhost'
 * effective user's home directory: /Users/olof.grund
 * Erlang cookie hash: d1oONiVA/qogGxkf6vs9Rw==

当我在容器中执行此操作时

docker-compose exec -T rabbitmq3 rabbitmqctl status

它起作用了。

我需要以某种方式从 docker 公开一些东西吗？也许是一些rabbitmq客户端或节点？

Answer 1

我使用了在其他来源中找到的所有技巧。 （将 IP 添加到 /etc/hosts/，重新启动容器、服务）。我花了一天时间才终于让它发挥作用，归根结底就是这样。

<wait for 60secs since the rabbit container has been started>
rabbitmqctl stop_app
rabbitmqctl reset
rabbitmqctl force_boot
rabbitmqctl start_app

Answer 2

由于 Docker 执行命令是即时的，特别是在 docker build 命令中，这些命令是分离的并且不等待，有时执行

rabbitmqctl

命令会失败，因为你没有等待几秒钟。考虑放置

sleep 15

，然后执行命令。

Answer 3

Rabbitmq 使用 Erlang 的分发协议，需要为 EPMD（Erlang 端口映射器守护进程）打开端口 4369，在 docker-compose 中公开它并停止在主机中运行的 EPMD。