文章介绍了在遇到yum检查时发现2个预存在的rpm数据库问题，涉及postfix缺少libmysqlclient.so.18库的依赖。解决方案是下载并安装Percona-XtraDB-Cluster-shared-55相关的RPM包，通过wget获取指定版本的RPM文件，然后使用rpm命令进行安装。
##提示如下
** Found 2 pre-existing rpmdb problem(s), ‘yum check’ output follows:
2:postfix-2.10.1-7.el7.x86_64 has missing requires of libmysqlclient.so.18()(64bit)
2:postfix-2.10.1-7.el7.x86_64 has missing requires of libmysqlclient.so.18(libmysqlclient_18)(64bit)
##解决方法
安装Percona-XtraDB-Cluster-shared-55-5.5.37-25.10.756.el6.x86_64.rpm这个包即可
1.wget http://www.percona.com/redir/downloads/Percona-XtraDB-Cluster/5.5.37-25.10/RPM/rhel6/x86_64/Percona-XtraDB-Cluster-shared-55-5.5.37-25.10.756.el6.x86_64.rpm
2.rpm -ivh Percona-XtraDB-Cluster-shared-55-5.5.37-25.10.756.el6.x86_64.rpm
转载自:https://www.lhl.zone/Linux/4.html
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