1.下载mysql
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
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
报错
参考： 启动mysql服务时一直提示ERROR! The server quit without updating PID file
本来是想直接用root使用mysql的，但是mysqld_safe无法通过，需修改mysql.server文件：
vim /usr/local/mysql/support-files/mysql.server
输入 /mysqld_safe 搜索，找到如下位置
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/
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
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
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';
不要忘记刷新权限
flush privileges;
完！
