Requires: erlang >= 20.3 Available: erlang-R16B-03.18.el7.x86_64

（1）错误示例

在yum安装rabbitmq的时候报这个错误。

yum install rabbitmq-server-3.7.4-1.el7.noarch.rpm 
Loaded plugins: fastestmirror
Examining rabbitmq-server-3.7.4-1.el7.noarch.rpm: rabbitmq-server-3.7.4-1.el7.noarch
Marking rabbitmq-server-3.7.4-1.el7.noarch.rpm to be installed
Resolving Dependencies
--> Running transaction check
---> Package rabbitmq-server.noarch 0:3.7.4-1.el7 will be installed
--> Processing Dependency: erlang >= 20.3 for package: rabbitmq-server-3.7.4-1.el7.noarch
Loading mirror speeds from cached hostfile
--> Finished Dependency Resolution
Error: Package: rabbitmq-server-3.7.4-1.el7.noarch (/rabbitmq-server-3.7.4-1.el7.noarch)
           Requires: erlang >= 20.3
           Available: erlang-R16B-03.4.el7.x86_64 (epel)
               erlang = R16B-03.18.el7
 You could try using --skip-broken to work around the problem
 You could try running: rpm -Va --nofiles --nodigest
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（2）解决方案

1、配置erlang的yum源
vi /etc/yum.repos.d/rabbitmq-erlang.repo
[rabbitmq-erlang]
name=rabbitmq-erlang
baseurl=https://dl.bintray.com/rabbitmq-erlang/rpm/erlang/22/el/7
gpgcheck=1
gpgkey=https://dl.bintray.com/rabbitmq/Keys/rabbitmq-release-signing-key.asc
repo_gpgcheck=0
enabled=1

2、删除老包，安装新包
yum remove erlang-erts-R16B-03.18.el7.x86_64
yum install erlang-20.3-1.el7.centos.x86_64.rpm

3、清理rpm文件缓存
yum clean all
yum makecache

4、使用yum命令查看erlang最新版本
yum list |grep erlang 
如果是22，即可继续操作

5、安装erlang
yum install erlang.x86_64

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