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1.安装mysql-5.5的yum源

rpm -ivh http://repo.mysql.com/yum/mysql-5.5-community/el/6/x86_64/mysql-community-release-el6-5.noarch.rpm
2.修改安装好的yum源

编辑 /etc/yum.repos.d/mysql-community.repo文件，将5.5的enabled改为1,5.6的enabled改为0

Enable to use MySQL 5.5

[mysql55-community]
name=MySQL 5.5 Community Server
baseurl=http://repo.mysql.com/yum/mysql-5.5-community/el/6/$basearch/
enabled=1
gpgcheck=1
gpgkey=file:/etc/pki/rpm-gpg/RPM-GPG-KEY-mysql

Enable to use MySQL 5.6

[mysql56-community]
name=MySQL 5.6 Community Server
baseurl=http://repo.mysql.com/yum/mysql-5.6-community/el/6/$basearch/
enabled=0
gpgcheck=1
gpgkey=file:/etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
3.安装mysql-5.5

yum install mysql-community-client mysql-community-devel mysql-community-server php-mysql
4.调整配置

编辑 /etc/my.cnf 文件