mysql版本：mysql-5.7.22-linux-glibc2.12-x86_64

查看系统中是否已安装mariadb 服务

rpm -qa | grep mariadb

卸载 mariadb及其依赖的包

yum -y remove mariadb-libs-5.5.44-2.el7.centos.x86_64

防火墙设置

查看防火墙状态

systemctl status firewalld

关闭防火墙

systemctl stop firewalld

查看防火墙是否开机自启

systemctl is-enabled firewalld.service;echo $?禁止防火墙开机启动

systemctl disable firewalld

上传MySQL安装文件

将mysql-5.7.22-linux-glibc2.12-x86_64.tar.gz文件上传到/usr/local/目录下解压

tar-zxvf mysql-5.7.22-linux-glibc2.12-x86_64.tar.gz

将文件重命名

mv mysql-5.7.22-linux-glibc2.12-x86_64 mysql

添加用户和组

groupadd mysql

useradd mysql-g mysql

创建数据目录并赋予权限

在系统根目录下创建data目录和mysql目录

cd /mkdir-p data

cd data

mkdir-p mysql

授权并查看授权信息

chown mysql:mysql -R /data/mysql

配置my.cnf参数

在/etc目录下创建my.cnf文件，并进行配置：

[mysqld]

basedir=/usr/local/mysql

datadir=/data/mysql

socket=/tmp/mysql.sock

user=mysql

port=3306character-set-server=utf8mb4

# cancle password

skip-grant-tables

# Disabling symbolic-links is recommended to prevent assorted security risks

symbolic-links=0[mysqld_safe]

log-error=/var/log/mysqld.log

pid-file=/var/run/mysqld/mysqld.pid

配置mysql参数

/usr/local/mysql/bin/mysql_install_db --user=mysql --basedir=/usr/local/mysql/ --datadir=/data/mysql

初始化配置

/usr/local/mysql/bin/mysqld --defaults-file=/etc/my.cnf --basedir=/usr/local/mysql/ --datadir=/data/mysql/ --user=mysql --initialize

注意：如果是报错或者重新初始化，需要清空/data/mysql/下的文件。

开启服务

将mysql加入服务

cp/usr/local/mysql/support-files/mysql.server /etc/init.d/mysql

设置开机自启

chkconfig mysql on

开启数据库服务

service mysql start

修改密码

/usr/local/mysql/bin/mysql -u root -p>>use mysql;>>update user set authentication_string=password('你的密码') where user='root';>>flush privileges;>>exit;

重启mysql服务

service mysql restart

这是空密码进入，修改好密码之后，就用新的密码登录，同时将my.cnf文件中的skip-grant-tables注释掉

[mysqld]

basedir=/usr/local/mysql

datadir=/data/mysql

socket=/tmp/mysql.sock

user=mysql

port=3306character-set-server=utf8mb4

# cancle password

#skip-grant-tables

# Disabling symbolic-links is recommended to prevent assorted security risks

symbolic-links=0[mysqld_safe]

log-error=/var/log/mysqld.log

pid-file=/var/run/mysqld/mysqld.pid

重启mysql服务

service mysql restart

允许远程连接

/usr/local/mysql/bin/mysql -u root -p>>use mysql;>>update user set host='%' where user = 'root';>>flush privileges;>>eixt;

配置mysql环境变量

ln -s /usr/local/mysql/bin/mysql /usr/bin

设置开机自启动

cp /usr/local/mysql/support-files/mysql.server /etc/rc.d/init.d/mysql

chmod+x /etc/init.d/mysql

chkconfig--add mysql

查看服务

chkconfig--list

看到对应服务名的34 5为open 或者 on 即可