解压安装包

cd /usr/local
tar xvf mysql-8.0.12-linux-glibc2.12-x86_64.tar.xz
mv mysql-8.0.12-linux-glibc2.12-x86_64 mysql
cd mysql/
mkdir conf
export PATH=$PATH:/usr/local/mysql/bin

实例1配置文件 my00.cnf

[mysqld]
basedir=/usr/local/mysql
datadir=/var/lib/mysql00
socket=/tmp/mysql00.sock
symbolic-links=0
port=3306
mysqlx_port=33060
[mysqld_safe]
log-error=/var/log/mysqld00.log
pid-file=/var/lib/mysql00/mysqld.pid

实例2配置文件 my01.cnf

[mysqld]
basedir=/usr/local/mysql
datadir=/var/lib/mysql01
socket=/tmp/mysql01.sock
symbolic-links=0
port=3307
mysqlx_port=33070
[mysqld_safe]
log-error=/var/log/mysqld01.log
pid-file=/var/lib/mysql01/mysqld.pid

实例3配置文件 my02.cnf

[mysqld]
basedir=/usr/local/mysql
datadir=/var/lib/mysql02
socket=/tmp/mysql02.sock
symbolic-links=0
port=3308
mysqlx_port=33080
[mysqld_safe]
log-error=/var/log/mysqld02.log
pid-file=/var/lib/mysql02/mysqld.pid

初始化实例

mysqld --defaults-file=/usr/local/mysql/conf/my00.cnf --initialize --user=mysql
mysqld --defaults-file=/usr/local/mysql/conf/my01.cnf --initialize --user=mysql
mysqld --defaults-file=/usr/local/mysql/conf/my02.cnf --initialize --user=mysql

启动实例

mysqld_safe --defaults-file=/usr/local/mysql/conf/my00.cnf --user=mysql &
mysqld_safe --defaults-file=/usr/local/mysql/conf/my01.cnf --user=mysql &
mysqld_safe --defaults-file=/usr/local/mysql/conf/my02.cnf --user=mysql &

修改密码

mysql -S /tmp/mysql00.sock -u root -p
ALTER USER root@'localhost' IDENTIFIED BY 'MySQL8.0';
mysql -S /tmp/mysql01.sock -u root -p
ALTER USER root@'localhost' IDENTIFIED BY 'MySQL8.0';
mysql -S /tmp/mysql02.sock -u root -p
ALTER USER root@'localhost' IDENTIFIED BY 'MySQL8.0';

关闭实例

mysqladmin -S /tmp/mysql00.sock -u root -pMySQL8.0 shutdown
mysqladmin -S /tmp/mysql01.sock -u root -pMySQL8.0 shutdown
mysqladmin -S /tmp/mysql02.sock -u root -pMySQL8.0 shutdown

注意：账号 root@'locahost' 使用 socket 连接数据库

参考文档：在Unix上运行多个MySQL实例