//下載（略），解壓
[root@slave ~]# tar -xf mysql-5.7.31-linux-glibc2.12-x86_64.tar.gz 
[root@slave ~]# yum -y install libncurses*
//建立資料庫資料夾
[root@slave ~]#  mkdir -p /opt/data/{3306,3307}

//建立根使用者mysql
[root@slave ~]# useradd -r -s /usr/sbin/nologin mysql

//將mysql解壓資料夾移動到指定目錄
[root@slave ~]# mv mysql-5.7.31-linux-glibc2.12-x86_64 /usr/local/

//建立軟連結
[root@slave ~]# ln -s /usr/local/mysql-5.7.31-linux-glibc2.12-x86_64/ /usr/local/mysql
[root@slave ~]# ln -s  /usr/local/mysql/include/ /usr/local/include/mysql

//增加環境變數
[root@slave ~]# echo 'export PATH=/usr/local/mysql/bin:$PATH'> /etc/profile.d/mysql.sh
[root@slave ~]# . /etc/profile.d/mysql.sh
[root@slave ~]# echo $PATH
/usr/local/mysql/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin

//增加幫助文件和庫檔案匹配路徑
[root@slave ~]# vim /etc/man_db.conf 
MANDATORY_MANPATH                       /usr/local/mysql/man
[root@slave ~]# vim /etc/ld.so.conf.d/mysql.conf
/usr/local/mysql/lib
[root@slave ~]# ldconfig

//初始化兩個例項機，儲存臨時密碼
[root@slave ~]# mysqld --initialize --basedir=/opt/data/3306 --user=mysql
[root@slave ~]# echo 'XJth1eIC-EXa'>passwd3306
[root@slave ~]#  mysqld --initialize --basedir=/opt/data/3307 --user=mysql
[root@slave ~]# echo '*g5(Rij+j1wV'>passwd3307

//安裝perl命令
[root@slave ~]# yum -y install perl
Complete!

//配置多例項檔案
[root@slave ~]# vim /etc/my.cnf
...
[mysqld_multi]
mysqld = /usr/local/mysql/bin/mysqld_safe
mysqladmin = /usr/local/mysql/bin/mysqladmin

[mysqld3306]
datadir = /opt/data/3306
port = 3306
socket = /tmp/mysql3306.sock
pid-file = /opt/data/3306/mysql_3306.pid
log-error=/var/log/3306.log
[mysqld3307]
datadir = /opt/data/3307
port = 3307
socket = /tmp/mysql3307.sock
pid-file = /opt/data/3307/mysql_3306.pid
log-error=/var/log/3307.log

//啟動服務3306
[root@slave ~]# mysqld_multi start 3306
Installing new database in /opt/data/3306
...
2021-01-03T08:26:40.212207Z 1 [Note] A temporary password is generated for root@localhost: XJth1eIC-EXa
//啟動服務3307
[root@slave ~]# mysqld_multi start 3307
Installing new database in /opt/data/3307

...
2021-01-03T08:27:06.142304Z 1 [Note] A temporary password is generated for root@localhost: /jsSxslpl0-t

//檢視監聽埠
[root@slave ~]# ss -antl
State             Recv-Q            Send-Q                       Local Address:Port                       Peer Address:Port           
LISTEN            0                 128                                0.0.0.0:22                              0.0.0.0:*              
LISTEN            0                 80                                       *:3306                                  *:*              
LISTEN            0                 80                                       *:3307                                  *:*              
LISTEN            0                 128                                   [::]:22                                 [::]:*   

//登入重置密碼
//3307端
[root@slave ~]# mysql -uroot  -p'/jsSxslpl0-t' -S /tmp/mysql3307.sock 
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.7.31

Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> set password=password('123456');
Query OK, 0 rows affected, 1 warning (0.00 sec)
//3306端
[root@slave ~]# mysql -uroot  -p'XJth1eIC-EXa' -S /tmp/mysql3306.sock 
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 9
Server version: 5.7.31

Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> set password=password('123456');
Query OK, 0 rows affected, 1 warning (0.01 sec)