1.下载mysql

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或者

wget https://dev.mysql.com/get/Downloads/MySQL-8.0/mysql-8.0.29-linux-glibc2.12-x86_64.tar.xz

tar -xvf mysql-8.0.29-linux-glibc2.12-x86_64.tar.xz

mv mysql-8.0.29-linux-glibc2.12-x86_64 /usr/loacl/mysql

2. 创建数据存放文件夹

cd /usr/local/mysql

mkdir data

3. 初始化数据库

./bin/mysqld  --basedir=/usr/local/mysql --datadir=/usr/local/mysql/data --initialize

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初始化完会生成一个临时密码，记得保存
mysqld –initialize-insecure可以生成无密码的root用户

4. 修改my.cnf文件

vim /etc/my.cnf

内容如下：

[mysqld]
    basedir = /usr/local/mysql
    datadir = /usr/local/mysql/data
    socket = /usr/local/mysql/mysql.sock
    character-set-server=utf8
    port=3306

    symbolic-links=0

    log-error=/usr/local/mysql/data/mysql.log
    pid-file=/usr/local/mysql/data/mysql.pid
[client]
   socket = /usr/local/mysql/mysql.sock
   default-character-set=utf8

#datadir=/var/lib/mysql
#socket=/var/lib/mysql/mysql.sock
# Disabling symbolic-links is recommended to prevent assorted security risks
#symbolic-links=0
# Settings user and group are ignored when systemd is used.
# If you need to run mysqld under a different user or group,
# customize your systemd unit file for mariadb according to the
# instructions in http://fedoraproject.org/wiki/Systemd

#[mysqld_safe]
#log-error=/usr/local/mysql/data/mysql.log
#pid-file=/usr/local/mysql/data/mysql.pid

#
# include all files from the config directory

./support-files/mysql.server start

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报错

 vim /usr/local/mysql/support-files/mysql.server

输入 /mysqld_safe 搜索，找到如下位置
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添加 --user=root

不想改就得创建mysql用户：

5. 创建mysql用户（可选）

groupadd mysql
useradd -g mysql mysql

chown -R mysql.mysql /usr/local/mysql/

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重新初始化数据库

./bin/mysqld --user=mysql --basedir=/usr/local/mysql --datadir=/usr/local/mysql/data --initialize

再启动，成功
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6. 创建mysql服务

将mysql.server复制到/etc/init.d/

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

赋予权限

chmod +x /etc/init.d/mysql

创建chkconfig服务，可以开机自启

chkconfig --add mysql

service mysql start

7. 配置环境变量

vim /etc/profile

添加以下内容

export PATH=$PATH:/usr/local/mysql/bin

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使配置生效：

source /etc/profile

8. 修改密码并允许远程访问

改密码为123456

ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '123456';

use mysql

update user set host='%' where user='root';

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完！

centos7安装mysql8