# cat /etc/redhat-release 
CentOS Linux release 7.9.2009 (Core)

yum源下载

地址：https://dev.mysql.com/downloads/repo/yum/

下载地址：https://repo.mysql.com//mysql80-community-release-el7-3.noarch.rpm

下载完成后使用yum命令本地安装yum源

# yum localinstall mysql80-community-release-el7-3.noarch.rpm
# yum repolist enabled | grep "mysql.*-community.*"
mysql-connectors-community/x86_64    MySQL Connectors Community               95
mysql-tools-community/x86_64         MySQL Tools Community                    84
mysql80-community/x86_64             MySQL 8.0 Community Server               82

安装MySQL,不启动MySQL

#  yum install -y mysql-community-server

修改默认数据存储路径

默认存储路径是/var/lib/mysql,修改成/data/mysql

mkdir -p /data/mysql

vim /ect/my.cnf
# 原有内容注释掉
#datadir=/var/lib/mysql
#socket=/var/lib/mysql/mysql.sock

datadir=/data/mysql
socket=/data/mysql/mysql.sock
log-error=/data/mysql/mysqld.log
pid-file=/data/mysql/mysqld.pid
lower_case_table_names=1
port=3307

default_authentication_plugin=mysql_native_password
default-storage-engine=INNODB
character-set-server=utf8mb4

sql_mode=STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION
max_connections=1000
max_user_connections=500
max_connect_errors=10
wait_timeout=1800
interactive_timeout=1800

[mysql]
default-character-set=utf8mb4

[client]
port=3307
default-character-set=utf8mb4

systemctl start mysqld.service

MySQL常用命令

systemctl start mysqld.service
systemctl status mysqld.service

查看root默认密码

# grep 'temporary password' /data/mysql/mysqld.log

修改root密码

alter user 'root'@'localhost'IDENTIFIED BY 'eSem?a?ap123';
flush privileges;

创建远程访问的root用户

create user 'root'@'%' identified BY 'eSem?a?ap123';
grant all on *.* to 'root'@'%';
flush privileges;