[root@k8s-n2 ~]# wget https://repo.mysql.com//mysql80-community-release-el7-3.noarch.rpm
[root@k8s-n2 ~]# rpm -ivh mysql80-community-release-el7-3.noarch.rpm 
[root@k8s-n2 ~]# yum install mysql-community-server

[root@k8s-n2 ~]# systemctl start mysqld
#查找初始密码，并修改
[root@k8s-n2 ~]# grep 'temporary password' /var/log/mysqld.log
2020-05-18T07:38:39.467953Z 6 [Note] [MY-010454] [Server] A temporary password is generated for root@localhost: !Fr0,r:-BlCM
[root@k8s-n2 ~]# mysql -uroot -p
Enter password: 
mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'MyNewPass4!';

[root@k8s-n2 ~]# vim /etc/my.cnf

[mysqld@server1]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
port=3306
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

[mysqld@server2]
datadir=/var/lib/mysql-server2
socket=/var/lib/mysql-server2/mysql.sock
port=3307
log-error=/var/log/mysqld-server2.log
pid-file=/var/run/mysql-dserver2/mysqld.pid

[root@k8s-n2 ~]# mkdir -pv /var/lib/mysql-server2
[root@k8s-n2 ~]# mkdir -pv /var/run/mysql-dserver2
[root@k8s-n2 ~]# chown mysql.mysql /var/lib/mysql-server2
[root@k8s-n2 ~]# chown mysql.mysql /var/run/mysql-dserver2/

[root@k8s-n2 ~]# systemctl start  mysqld@server1
[root@k8s-n2 ~]# systemctl enable  mysqld@server1
[root@k8s-n2 ~]# systemctl start  mysqld@server2
[root@k8s-n2 ~]# systemctl enable  mysqld@server2
[root@k8s-n2 ~]# grep 'temporary password' /var/log/mysqld-server2.log 
2020-05-19T00:31:49.956350Z 6 [Note] [MY-010454] [Server] A temporary password is generated for root@localhost: GHUQDX7k2?S:
[root@k8s-n2 ~]# mysql -uroot -p -S /var/lib/mysql-server2/mysql.sock
Enter password: 
mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'MyNewPass4!';
Query OK, 0 rows affected (0.01 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)