(1) 列出所有被安装的rpm package

#rpm-qa|grepmariadbmariadb-libs-5.5.50-1.el7_2.x86_64mariadb-5.5.50-1.el7_2.x86_64mariadb-server-5.5.50-1.el7_2.x86_64

(2) 卸载

#rpm-emariadb-libs-5.5.50-1.el7_2.x86_64

此时报错：

error:Faileddependencies:libmysqlclient.so.18()(64bit)isneededby(installed)postfix-2:2.10.1-6.el7.x86_64libmysqlclient.so.18()(64bit)isneededby(installed)perl-DBD-MySQL-4.023-5.el7.x86_64libmysqlclient.so.18()(64bit)isneededby(installed)php-mysql-5.4.16-36.3.el7_2.x86_64libmysqlclient.so.18(libmysqlclient_18)(64bit)isneededby(installed)postfix-2:2.10.1-6.el7.x86_64libmysqlclient.so.18(libmysqlclient_18)(64bit)isneededby(installed)perl-DBD-MySQL-4.023-5.el7.x86_64libmysqlclient.so.18(libmysqlclient_18)(64bit)isneededby(installed)php-mysql-5.4.16-36.3.el7_2.x86_64mariadb-libs(x86-64)=1:5.5.50-1.el7_2isneededby(installed)mariadb-1:5.5.50-1.el7_2.x86_64mariadb-libs(x86-64)=1:5.5.50-1.el7_2isneededby(installed)mariadb-server-1:5.5.50-1.el7_2.x86_64

(3) 强制卸载，因为没有–nodeps

#rpm-e--nodepsmariadb-libs-5.5.50-1.el7_2.x86_64#rpm-e--nodepsmariadb-5.5.50-1.el7_2.x86_64#rpm-e--nodepsmariadb-server-5.5.50-1.el7_2.x86_64

(4) 然后可以安装mysql了。