1、查看下面软件包是否安装，如果安装卸载。

# rpm -qa | grep postfix

# rpm -qa | grep mariadb

# rpm -qa | grep mysql

2、创建目录

创建包存放目录

# mkdir /data/packages

创建mysql数据目录

# mkdir /data/mysql_data

3、解压并安装

# cd /data/packages

# tar -xf mysql-5.7.18-1.el7.x86_64.rpm-bundle.tar

# rpm -ivh mysql-community-common-5.7.18-1.el7.x86_64.rpm 

# rpm -ivh mysql-community-libs-5.7.18-1.el7.x86_64.rpm

# rpm -ivh mysql-community-client-5.7.18-1.el7.x86_64.rpm 

# rpm -ivh mysql-community-server-5.7.18-1.el7.x86_64.rpm

4、赋予权限并设置开机自启动

# chown mysql:mysql /data/mysql_data

# systemctl enable mysqld.service

5、编辑配置文件

# vi /etc/my.cnf

[mysql]

default-character-set=utf8

datadir=/data/mysql_data

default-storage-engine=INNODB

character_set_server=utf8

expire_logs_days=15

innodb_buffer_pool_size=8G

innodb_log_file_size=256M

innodb_flush_method=O_DIRECT

max_connections=500

innodb_autoextend_increment=128

sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES

6、启动服务并设置登录密码

# systemctl start mysqld.service

查看初始密码

# grep "root@localhost" /var/log/mysqld.log | awk '{print $11}'

使用初始密码登录并修改密码

# mysql -uroot -p

mysql> set password=password('自定义密码');