error: Failed dependencies:
mysql-community-release conflicts with (installed) mysql57-community-release-el6-9.noarch
安装成功！
加上那两个参数的意义就在于，
安装时不再分析包之间的依赖关系而直接安装
error: Failed dependencies:
mysql-community-release conflicts with (installed) mysql57-community-release-el6-9.noarch