Rabbitmq 报错：reply-code=503, reply-text=COMMAND_INVALID - unknown exchange type 'x-delayed-message'

控制台报错信息：

2019-09-24 13:05:30.145 ERROR 8444 --- [168.47.131:5672] o.s.a.r.c.CachingConnectionFactory       : Channel shutdown: connection error; protocol method: #method<connection.close>(reply-code=503, reply-text=COMMAND_INVALID - unknown exchange type 'x-delayed-message', class-id=40, method-id=10)
2019-09-24 13:05:30.145 ERROR 8444 --- [168.47.131:5672] o.s.a.r.c.CachingConnectionFactory       : Channel shutdown: connection error; protocol method: #method<connection.close>(reply-code=503, reply-text=COMMAND_INVALID - unknown exchange type 'x-delayed-message', class-id=40, method-id=10)
2019-09-24 13:05:30.156  INFO 8444 --- [ntContainer#0-1] o.s.a.r.c.CachingConnectionFactory       : Attempting to connect to: 192.168.47.131:5672

查看Linux下rabbitmq的安装插件：查找

1	`rabbitmq_delayed_message_exchange`

通过命令：rabbitmq-plugins list

此时并没有找到该插件；

附：rabbitmq 插件安装（官网）

https://www.rabbitmq.com/community-plugins.html

下载对应版本，由于我的rabbitmq是3.6.5，所以我安装3.6.x版本；

然后开启rabbitmq_delayed_message_exchange插件

1	`rabbitmq-plugins enable rabbitmq_delayed_message_exchange`

再次启动项目，并无报错信息。　　

https://blog.csdn.net/qq_37495786/article/details/101279491

https://www.freesion.com/article/2427422019/

1	`Error: Channel closed by server:` `406` `(PRECONDITION-FAILED) with message` `"PRECONDITION_FAILED - Invalid argument, 'x-delayed-type' must be an existing exchange type"`

这个问题困扰我了一会儿，详情可见 Github Issues rabbitmq-delayed-message-exchange/issues/19，正确操作如下图所示：