Mysql多實例配置
1.什么是多實例?
在linux系統中代表：多個進程+多個線程+多個預分配內存結構
一般用來測試環境中，測試主從，高可用等。
多實例配置方案：（多個數據庫管理系統）
端口port分開
配置文件分開
socket分開
日志分開
多serverid
都可以使用mysql用戶
#總結，初始化多次數據庫
2.多實例實戰
#1.創建多個數據目錄
[root@db01 ~]# mkdir /data/{3307,3308,3309} -p
[root@db01 data]# tree /data
/data
├── 3307
├── 3308
└── 3309
#2.准備多個配置文件
[root@db01 data]# vim /data/3307/my.cnf
[mysqld]
basedir=/usr/local/mysql
datadir=/data/3307/data
port=3307
socket=/data/3307/mysql.sock
log-error=/data/3307/data/mysql.err
log-bin=/data/3307/data/mysql-bin
server_id=7
-------------------------------------------
[root@db01 data]# vim /data/3308/my.cnf
[mysqld]
basedir=/usr/local/mysql
datadir=/data/3308/data
port=3308
socket=/data/3308/mysql.sock
log-error=/data/3308/data/mysql.err
log-bin=/data/3308/data/mysql-bin
server_id=8
--------------------------------------------
[root@db01 data]# vim /data/3309/my.cnf
[mysqld]
basedir=/usr/local/mysql
datadir=/data/3309/data
port=3309
socket=/data/3309/mysql.sock
log-error=/data/3309/data/mysql.err
log-bin=/data/3309/data/mysql-bin
server_id=9
---------------------------------------------
[root@db01 data]# tree /data/
/data/
├── 3307
│ └── my.cnf
├── 3308
│ └── my.cnf
└── 3309
└── my.cnf
#3.初始化多套數據目錄
3307:
[root@db01 scripts]# ./mysql_install_db --defaults-file=/data/3307/my.cnf --user=mysql --basedir=/usr/local/mysql --datadir=/data/3307/data
3308:
[root@db01 scripts]# ./mysql_install_db --defaults-file=/data/3308/my.cnf --user=mysql --basedir=/usr/local/mysql --datadir=/data/3308/data
3309:
[root@db01 scripts]# ./mysql_install_db --defaults-file=/data/3309/my.cnf --user=mysql --basedir=/usr/local/mysql --datadir=/data/3309/data
#### 在5.7版本中 mysqld --initialize-insecure 進行初始化
#4.授權
[root@db01 scripts]# chown -R mysql.mysql /data
#5.啟動MySQL多實例
[root@db01 scripts]# mysqld_safe --defaults-file=/data/3307/my.cnf &
[root@db01 scripts]# mysqld_safe --defaults-file=/data/3308/my.cnf &
[root@db01 scripts]# mysqld_safe --defaults-file=/data/3309/my.cnf &
#6.關閉多實例
[root@db01 scripts]# mysqladmin -S /data/3307/mysql.sock shutdown
[root@db01 scripts]# mysqladmin -S /data/3308/mysql.sock shutdown
[root@db01 scripts]# mysqladmin -S /data/3309/mysql.sock shutdown
#7.檢查端口
[root@db01 scripts]# netstat -lntup|grep 330
tcp6 0 0 :::3307 :::* LISTEN 25550/mysqld
tcp6 0 0 :::3308 :::* LISTEN 25722/mysqld
tcp6 0 0 :::3309 :::* LISTEN 25894/mysqld
#8.設置多實例密碼
[root@db01 scripts]# mysqladmin -uroot -S /data/3307/mysql.sock password '3307'
[root@db01 scripts]# mysqladmin -uroot -S /data/3308/mysql.sock password '3308'
[root@db01 scripts]# mysqladmin -uroot -S /data/3309/mysql.sock password '3309'
#9.驗證庫連接( 查看server_id )
[root@db01 scripts]# mysql -uroot -p3307 -S /data/3307/mysql.sock -e "show variables like 'server_id';"Warning: Using a password on the command line interface can be insecure.
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| server_id | 7 |
+---------------+-------+
[root@db01 scripts]# mysql -uroot -p3308 -S /data/3308/mysql.sock -e "show variables like 'server_id';"Warning: Using a password on the command line interface can be insecure.
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| server_id | 8 |
+---------------+-------+
[root@db01 scripts]# mysql -uroot -p3309 -S /data/3309/mysql.sock -e "show variables like 'server_id';"Warning: Using a password on the command line interface can be insecure.
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| server_id | 9 |
+---------------+-------+
連接的小技巧:
[root@db01 scripts]# vim /usr/bin/mysql3309
mysql -uroot -p3309 -S /data/3309/mysql.sock
[root@db01 scripts]# vim /usr/bin/mysql3308
mysql -uroot -p3308 -S /data/3308/mysql.sock
[root@db01 scripts]# vim /usr/bin/mysql3307
mysql -uroot -p3307 -S /data/3307/mysql.sock
[root@db01 scripts]# chmod +x /usr/bin/mysql*
連接:[root@db01 scripts]# mysql3309