rabbitmq 集群：
erlang下载:
erlang-23.3.4.10-1.el7.x86_64.rpm github下载
erlang安装：
yum install -y erlang-23.3.4.10-1.el7.x86_64.rpm
rabbitmqserver安装:
curl -s https://packagecloud.io/install/repositories/rabbitmq/rabbitmq-server/script.rpm.sh | sudo bash
sudo yum install rabbitmq-server-3.9.16-1.el7.noarch
启动rabbitmq-server
systemctl start rabbitmq-server