mysql的安装无非以下几种，其中yum安装也是rpm安装中的一种，只不过这种不需要再单独下载安装包，直接根据操作系统自带的mysql包进行安装，比较简单，本篇主要对yum进行讲解，后续会对其它几种方式进行总结。
目前的安装方式
1，rpm 安装
2，二进制安装
3，源码安装
4，yum安装
yum方式安装
1. 安装操作系统
1.1安装Red Hat Enterprise Linux 6.2 (64-bit)
arch: x86_64
1.2. 关闭selinux vi /etc/selinux/config
1.3. service iptables stop 临时关闭防火墙
2 安装数据库MySQL
2.1挂载Redhat镜像文件 ftp://192.168.0.212/pub/iso/rhel6.2/，命令如下
#mkdir -p /mnt/iso
#mkdir -p /mnt/redhat5.5
# mount 192.168.0.212:/var/ftp/pub/iso/rhel5.5/ /mnt/iso/
# mount -t iso9660 -o loop rhel-server-5.5-x86_64-dvd.iso /mnt/redhat5.5/
2.2 配置yum
# cd /etc/yum.repos.d/
# cp rhel-debuginfo.repo rhel-debuginfo.repo_bak
# vi rhel-debuginfo.repo
[rhel-debuginfo]
name=Red Hat Enterprise Linux $releasever - $basearch - Debug
baseurl=file:///mnt/redhat5.5/Server
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release
[oracle@Redhat5 yum.repos.d]$ ls
el5u5.repo el5u8.repo rhel-debuginfo.repo
[oracle@Redhat5 yum.repos.d]$ cat el5u8.repo
[Server]
name=Red Hat Enterprise Linux 5 update 8
baseurl=ftp://192.168.0.212/pub/src/RHEL5U8/x64/Server
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release
[VT]
name=Red Hat Enterprise Linux 5 update 8
baseurl=ftp://192.168.0.212/pub/src/RHEL5U8/x64/VT
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release
[Cluster]
name=Red Hat Enterprise Linux 5 update 8
baseurl=ftp://192.168.0.212/pub/src/RHEL5U8/x64/Cluster
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release
[ClusterStorage]
name=Red Hat Enterprise Linux 5 update 8
baseurl=ftp://192.168.0.212/pub/src/RHEL5U8/x64/ClusterStorage
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release
2.3根据需求创建mysql数据存储目录
# mkdir /mysqldata
2.4 yum安装mysql，mysql-server
# yum install mysql mysql-server
2.5 修改mysql配置文件
# vi /etc/my.cnf
[mysqld]
datadir=/data/mysql
socket=/var/lib/mysql/mysql.sock
user=mysql
# Default to using old password format for compatibility with mysql 3.x
# clients (those using the mysqlclient10 compatibility package).
old_passwords=1
default-character-set=utf8
# Disabling symbolic-links is recommended to prevent assorted security risks;
# to do so, uncomment this line:
# symbolic-links=0
lower_case_table_names=1
[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
[mysql]
default-character-set=utf8
2.6启动mysql，同时添加mysql自动启动
# /etc/rc.d/init.d/mysqld start
# chkconfig mysqld on
# chkconfig --list mysqld
2.7 修改mysql密码
# mysql -u root
/usr/bin/mysqladmin -u root password 123456
mysql> grant all on mysql.* to 'root'@'localhost' identified by 'mysql8895'
mysql> source /opt/MYSQL.sql 导入数据
mysql> exit
建立用户：
mysql> grant all on dcs.* to "ligang"@"%" identified by "dcsA99ligang";
