Reinstall RabbitMQ
* Starting message broker rabbitmq-server * FAILED - check /var/log/rabbitmq/startup_\{log, _err\}
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安裝 RabbitMQ 的時候碰到無法啟動的問題，嘗試下面的步驟把它刪除重新安裝時，
發現 hosts 設定是有問題的，於是重新設定後再整個移除安裝就能執行了
- Stop RabbitMQ: rabbitmqctl stop
- Change /etc/hosts
/etc/hosts
127.0.0.1 localhost
127.0.0.1（or my ip） MYHOSTNAME
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- Change /etc/hostname
/etc/hostname
MYHOSTNAME
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- Uninstall old RabbitMQ: dpkg -P rabbitmq-server
- Remove RabbitMQ’s database: rm -rf /var/lib/rabbitmq
- Find erlang’s process that is running rabbit: ps ax | grep rabbit
找看看有沒有rabbitmq的程序,有的話殺掉 - Kill the listed process (sudo kill -9 pid )
- Reinstall RabbitMQ: apt-get install rabbitmq-server
or sudo dpkg -i rabbitmq-server.deb
ACCESS_REFUSED - Login was refused using authentication mechanism PLAIN
再安裝完成RabbitMQ後 執行 Spring 噴出下面的錯誤，主要原因是帳號認証問題
org.springframework.amqp.AmqpAuthenticationException: com.rabbitmq.client.AuthenticationFailureException: ACCESS_REFUSED - Login was refused using authentication mechanism PLAIN. For details see the broker logfile.
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Create admin account myadmin/mypassword
[~]$ sudo rabbitmqctl add_user myadmin mypassword
[~]$ sudo rabbitmqctl set_user_tags myadmin administrator
[~]$ sudo rabbitmqctl set_permissions -p "/" myadmin ".*" ".*" ".*"
去網頁( http://127.0.0.1:15672 )檢查帳號的權限或再按一次 『Set permission 』
