CentOS6.x下yum安装MySQL5.5/5.6

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

安装MySQL5.6的可以安装：

# rpm -ivh http://repo.mysql.com/mysql-community-release-el6.rpm

最新的yum源可以去http://dev.mysql.com/downloads/repo/yum下载

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

[root@localhost yum.repos.d]# vim mysql-community.repo
# 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 -y install mysql-community-client mysql-community-devel mysql-community-server php-mysql

4. 调整配置

[root@localhost yum.repos.d]# vim /etc/my.cnf
#在[mysqld]下添加
innodb_file_per_table=1 设置InnoDB为独立表空间模式，每个数据库的每个表都会生成一个数据目录
innodb_buffer_pool_size= 默认值：128M，设置为操作系统内存的70%-80%最佳

 5. 启动mysql，查看mysql版本

[root@localhost yum.repos.d]# service mysqld start
Starting mysqld: [ OK ]
[root@localhost yum.repos.d]# mysql --version
mysql Ver 14.14 Distrib 5.5.58, for Linux (x86_64) using readline 5.1