原有MySQL數據庫 ，安裝多實例教程

#mysql安裝腳本安裝好后

mkdir -v /usr/share/mysql/mysql-files

mkdir -vp /data/mysql_data{1..4}

* 修改 MySQL 二進制包目錄的所屬用戶與所屬組

chown root.mysql -R /usr/share/mysql

* 修改 MySQL 多實例數據目錄與 數據導入/導出專放目錄的所屬用戶與所屬組

chown mysql.mysql -R /usr/share/mysql/mysql-files /data/mysql_data{1..4}

* 配置 MySQL 配置文件

cat>> /etc/multi.cnf<<EOF

[mysqld_multi]

mysqld = /usr/sbin/mysqld

mysqladmin = /usr/bin/mysqladmin

log = /tmp/mysql_multi.log

[mysqld1]

datadir = /data/mysql_data1

socket = /tmp/mysql.sock1

port = 3307

user = mysql

performance_schema = off

innodb_buffer_pool_size = 32M

bind_address = 0.0.0.0

skip-name-resolve = 0

[mysqld2]

datadir = /data/mysql_data2

socket = /tmp/mysql.sock2

port = 3308

user = mysql

performance_schema = off

innodb_buffer_pool_size = 32M

bind_address = 0.0.0.0

skip-name-resolve = 0

[mysqld3]

datadir = /data/mysql_data3

socket = /tmp/mysql.sock3

port = 3309

user = mysql

performance_schema = off

innodb_buffer_pool_size = 32M

bind_address = 0.0.0.0

skip-name-resolve = 0

EOF

* 初始化各個實例 [ 初始化完成后會自帶隨機密碼在輸出日志中 ] /var/log/mysqld.log

/usr/sbin/mysqld --initialize --user=mysql  --datadir=/data/mysql_data1

/usr/sbin/mysqld --initialize --user=mysql  --datadir=/data/mysql_data2

/usr/sbin/mysqld --initialize --user=mysql  --datadir=/data/mysql_data3

* 實例開啟

mysqld_multi --defaults-extra-file=/etc/multi.cnf start

測試

mysql -uroot -S /tmp/mysql.sock1 -p   密碼在初始化的時候會給root隨機密碼

grep 'temporary password' /var/log/mysqld.log| awk -F: '{print $4}'|awk 'NR==2{print}'

scok2 就將NR==3  

rep 'temporary password' /var/log/mysqld.log| awk -F: '{print $4}'|awk 'NR==3{print}'

依次類推

ALTER USER 'root'@'localhost' IDENTIFIED BY 'abc123';    先改密碼

增刪點數據對比下另一個實例的內容就可以

create database test3306;

show databases;

默認情況下，mysql只允許本地登錄，如果要開啟遠程連接，則需要修改/etc/mysql/my.conf文件。

一、修改/etc/mysql/my.conf
找到bind-address = 127.0.0.1這一行
改為bind-address = 0.0.0.0即可

為需要遠程登錄的用戶賦予權限
支持root用戶允許遠程連接mysql數據庫
grant all privileges on *.* to 'root'@'%' identified by 'abc123' with grant option;
flush privileges;  

use mysql;

select user, host from user;