问题1：
[root@localhost install-files]# rpm -ivh MySQL-server-5.6.27-1.el6.x86_64.rpm --nosignature
Preparing... ################################# [100%]
Updating / installing...
1:MySQL-server-5.6.27-1.el6 ################################# [100%]
warning: user mysql does not exist - using root
warning: group mysql does not exist - using root
FATAL ERROR: please install the following Perl modules before executing /usr/bin/mysql_install_db:
Data::Dumper
Preparing... ################################# [100%]
Updating / installing...
1:MySQL-server-5.6.27-1.el6 ################################# [100%]
warning: user mysql does not exist - using root
warning: group mysql does not exist - using root
FATAL ERROR: please install the following Perl modules before executing /usr/bin/mysql_install_db:
Data::Dumper
解决办法 [root@localhost install-files]# yum install -y perl-Module-Install.noarch