centos7安裝mysql數據庫時libs與mariadb衝突問題解決

安裝mysql數據庫時，需要rpm安裝libs，問題原因就是安裝libs時系統存在mariadb的系統包

1. 查看系統中的mariadb

	rpm -qa | grep mariadb

2. rpm -e mariadb-libs-5.5.44-2.el7.centos.x86_64得到錯誤提示如下：
   提示有第三方庫存在
   error: Failed dependencies:
   libmysqlclient.so.18()(64bit) is needed by (installed) postfix-2:2.10.1-7.el7.x86_64
   libmysqlclient.so.18(libmysqlclient_18)(64bit) is needed by (installed) postfix-2:2.10.1-7.el7.x86_64

3. rpm -ivh mysql-community-libs-8.0.18-1.el7.x86_64.rpm得到錯誤提示如下：
   warning: mysql-community-libs-8.0.18-1.el7.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY
   error: Failed dependencies:
   mariadb-libs is obsoleted by mysql-community-libs-8.0.18-1.el7.x86_64

4. 解決辦法
   強制刪除：rpm -e --nodeps mariadb-libs-5.5.60-1.el7_5.x86_64

問題解決，目前是本人安裝mysql數據庫遇到的問題