環境:
CentOS 6.8 
memory：1G
Mysql 5.7 二進位制安裝包

1.安裝相關的環境包

yum -y install gcc glibc libaio libstdc++ libstdc ncurses-libs 

2.檢視系統中是否存在已經安裝的mysql，如果有的話，將其解除安裝掉

rpm -qa | grep mysql
rpm -e mysql    #普通刪除模式
rpm -e --nodeps mysql    #強力刪除模式

3.建立組和使用者

groupadd mysql
useradd -r -g mysql -s /bin/false myqsl

4.解壓mysql5.7二進位制安裝包

tar -xvf mysql-5.7.15-linux-glibc2.5-x86_64.tar.gz
mv /root/mysql-5.7.15-linux-glibc2.5-x86_64 /usr/local/mysql

5.建立相關目錄
mkdir -p /mydata/data330{6..7}
chown mysql.mysql /mydata -R

6.修改my.cnf檔案
vi /etc/my.cnf
 
[mysqld_multi]
mysqld     = /usr/local/mysql/bin/mysqld_safe
mysqladmin = /usr/local/mysql/bin/mysqladmin
#user       = root
#password   = rootpwd
 
[mysqld3306]    //這裡最好不要寫其他名稱，開始的時候我加了下劃線，但是命令無法識別
port = 3306
server_id = 3306
basedir =/usr/local/mysql
datadir =/mydata/data3306
socket =/tmp/mysql3306.sock  
log-error =/var/log/mysqld_3306.log
pid-file =/mydata/data3306/mysqld3306.pid
 
[mysqld3307]  
port = 3307
server_id = 3307
basedir =/usr/local/mysql
datadir =/mydata/data3307
socket =/tmp/mysql3307.sock  
log-error =/var/log/mysqld_3307.log
pid-file =/mydata/data3306/mysqld3307.pid

修改好後儲存退出

7.新增環境變數

echo "PATH=$PATH:/usr/local/mysql/bin  " >> /etc/profile
source /etc/profile

8.初始化資料庫
bin/mysqld --initialize --user=mysql --datadir=/mydata/data3306 --basedir=/usr/local/mysql --explicit_defaults_for_timestamp
bin/mysqld --initialize --user=mysql --datadir=/mydata/data3307 --basedir=/usr/local/mysql --explicit_defaults_for_timestamp

這裡會提示一個臨時密碼，一定要記住！！

9.啟動兩個不同埠的mysql
mysqld_multi report 檢視下兩個服務

Reporting MySQL servers
No groups to be reported (check your GNRs)
這樣輸出的話，就證明/etc/my.cnf檔案配置錯誤了
例項沒有起來

Reporting MySQL servers
MySQL server from group: mysqld3306 is not running
MySQL server from group: mysqld3307 is not running

顯示的如上的話，證明例項已經識別了

在執行如下命令開啟例項
mysqld_multi start 3306,3307

再次檢視狀態
mysqld_multi report
MySQL server from group: mysqld3306 is running
MySQL server from group: mysqld3307 is running

檢視ps  aux | grep mysql
netstat -antpl | grep 330
 
如果有相關的程序，證明啟動成功

10.訪問資料庫
mysql -u root -p -S /tmp/mysql3306.sock  //這裡一定要指定sock檔案，否則啟動失敗的
Enter password:

mysql -u root -p -S /tmp/mysql3307.sock
Enter password:
 
11.修改root密碼
mysql -u root -p -S /tmp/mysql3307.sock
mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY '123456';
mysql> grant all privileges on *.* to [email protected]'192.168.1.%';
mysql> flush privileges;

同樣，登陸到另一個節點修改密碼
mysql -u root -p -S /tmp/mysql3306.sock 
mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY '123456';
mysql> grant all privileges on *.* to [email protected]'192.168.1.%';
mysql> flush privileges;

12.關閉某個例項
mysqladmin -uroot -prootpwd -S /tmp/mysql3306.sock shutdown

13.開啟自啟動
echo "/usr/local/mysql/bin/mysqld_multi --defaults-extra-file=/etc/my.cnf start 3306,3307" >> /etc/rc.local