Mysql5.6.40

mkdir –p /var/lib/mysql/ rpm -qa|grep mariadb // 查询出来已安装的mariadb
rpm -e --nodeps 文件名 // 卸载mariadb，文件名为上述命令查询出来的文件

yum -y install gcc gcc-c++ ncurses ncurses-devel cmake bison
5.6解压改名
chmod -R 755 mysql/
chown -R lbd.lbd mysql/

lbd用户默认已经创建

rm /etc/my.cnf
mkdir –p /var/lib/mysql/

./scripts/mysql_install_db --user=mysql --basedir=/usr/local/mysql/ --datadir=/usr/local/mysql/data/

vim /etc/my.cnf
[mysql]

设置mysql客户端默认字符集

default-character-set=utf8

[mysqld]
skip-name-resolve
#设置3306端口
port = 3306

设置mysql的安装目录

basedir=/usr/local/mysql

设置mysql数据库的数据的存放目录

datadir=/usr/local/mysql/data

允许最大连接数

max_connections=200

服务端使用的字符集默认为8比特编码的latin1字符集

character-set-server=utf8

创建新表时将使用的默认存储引擎

default-storage-engine=INNODB
max_allowed_packet=16M

cp support-files/mysql.server /etc/init.d/mysqld

cd /usr/local
vim /etc/init.d/mysqld

basedir=/usr/local/mysql
datadir=/usr/local/mysql/bin
屏蔽
#lockdir='/var/lock/subsys'
#lock_file_path="$lockdir/mysql"

chown -R lbd.lbd mysql/
service mysqld start
ln -s /usr/local/mysql/bin/mysql /usr/bin/mysql
chkconfig --add mysqld #增加mysqld服务
chkconfig --list #列出所有的系统服务
chkconfig --level 35 mysqld on
#设定mysqld在等级3和5为开机运行服务
mysql –u root –p
5.6初始没密码

grant all privileges on . to 'root'@'%' identified by 'lbd123';

FLUSH PRIVILEGES;