使用命令find / -name libmysqlclient.so*查询libmysqlclient.so，发现确实缺少libmysqlclient.so.18

 1、到mysql官网(https://downloads.mysql.com/archives/community/)下载安装包

[root@localhost ~]# wget https://downloads.mysql.com/archives/get/file/mysql-community-libs-compat-5.7.34-1.el7.x86_64.rpm

 2、安装mysql-community-libs-compat-5.7.34-1.el7.x86_64.rpm。

[root@localhost ~]# rpm -ivh mysql-community-libs-compat-5.7.34-1.el7.x86_64.rpm