卸载Erlang和RabbitMQ

第一种办法：
卸载Erlang和RabbitMQ
/sbin/service rabbitmq-server stop
yum list | grep rabbitmq
yum -y remove rabbitmq-server.noarch

yum list | grep erlang
yum -y remove erlang-*
yum remove erlang.x86_64
rm -rf /usr/lib64/erlang
rm -rf /var/lib/rabbitmq

第二种办法：
erlang没问题时，重装rabbitmq的问题

一、卸载

[root@zabbix_server lib]# rpm -qa|grep rabbitmq
rabbitmq-server-3.6.5-1.noarch
[root@zabbix_server lib]# rpm -e --nodeps rabbitmq-server

二、此时注意一定要手工删除rabbitmq目录

rm -rf /etc/rabbitmq
rm -rf /usr/lib/rabbitmq

不然，重装后启动节点会报如下错误：
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[root@zabbix_server src]# rabbitmq-server start &
[1] 8537
[root@zabbix_server src]#

BOOT FAILED

Error description:
“Found lock file at ~s. Either previous upgrade is in progress or has failed. Database backup path: ~s”

Log files (may contain more information):
/var/log/rabbitmq/rabbit@zabbix_server.log
/var/log/rabbitmq/rabbit@zabbix_server-sasl.log

Stack trace:
[{rabbit_upgrade,ensure_backup_taken,
[“/var/lib/rabbitmq/mnesia/rabbit@zabbix_server/schema_upgrade_lock”,
“/var/lib/rabbitmq/mnesia/rabbit@zabbix_server-upgrade-backup”],
[{file,“src/rabbit_upgrade.erl”},{line,101}]},
{rabbit_upgrade,maybe_upgrade_mnesia,0,
[{file,“src/rabbit_upgrade.erl”},{line,144}]},
{rabbit,’-boot/0-fun-0-’,0,[{file,“src/rabbit.erl”},{line,271}]},
{rabbit,start_it,1,[{file,“src/rabbit.erl”},{line,403}]},
{init,start_it,1,[]},
{init,start_em,1,[]}]

{“init terminating in do_boot”,“Found lock file at ~s. Either previous upgrade is in progress or has failed. Database backup path: ~s”}
/usr/lib/rabbitmq/bin/rabbitmq-server: line 236: 8683 用户定义信号 2 start_rabbitmq_server “$@”

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如果出现以上错误，请停掉新安装的rabbitmq，卸载后，手工删除相关目录，再重新安装

[root@zabbix_server src]# rpm -ivh rabbitmq-server-3.6.5-1.noarch.rpm
warning: rabbitmq-server-3.6.5-1.noarch.rpm: Header V4 RSA/SHA1 Signature, key ID 6026dfca: NOKEY
Preparing… ########################################### [100%]
1:rabbitmq-server ########################################### [100%]

启动节点正常
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[root@zabbix_server src]# rabbitmq-server start &
[1] 13105
[root@zabbix_server src]#
RabbitMQ 3.6.5. Copyright 2007-2016 Pivotal Software, Inc.

## Licensed under the MPL. See http://www.rabbitmq.com/

########## Logs: /var/log/rabbitmq/rabbit@zabbix_server.log

## /var/log/rabbitmq/rabbit@zabbix_server-sasl.log

##########
Starting broker…
completed with 0 plugins.