MySQL5.6多实例部署

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无论是迫于预算，亦或者是领导要求，多实例的安装也是 DBA 必须掌握的技术，她的启停和登录方式和单实例安装数据库略有不同，本文记录下如何完成 MySQL5.6 多实例部署。

首先我们看一下 my.cnf 和单实例的区分：

[root@HE1 scripts]#
cat /etc/my.cnf
[client]
#port = 3306
#socket = /tmp/mysql.sock
#default-character-set = utf8

[mysql]
#default-character-set = utf8

[mysqld3306]
port = 3306
basedir = /usr/local/mysql
datadir = /data/mysql_3306
socket = /tmp/mysql_3306.sock
slow_query_log_file = /data/mysql_3306/slow.log
log-error = /data/mysql_3306/error.log
log-bin = /data/mysql_3306/mysql-bin
sync_binlog = 1
binlog_format = row
transaction_isolation = REPEATABLE-READ
innodb_buffer_pool_size = 100m

[mysqld3308]
port = 3308
basedir = /usr/local/mysql
datadir = /data/mysql_3308
socket = /tmp/mysql_3308.sock
slow_query_log = 1
slow_query_log_file = /data/mysql_3308/slow.log
log-error = /data/mysql_3308/error.log
long_query_time = 1
log-bin = /data/mysql_3308/mysql-bin
sync_binlog = 1
binlog_cache_size = 4M
default-storage-engine = InnoDB
binlog_format = row
transaction_isolation = REPEATABLE-READ
innodb_buffer_pool_size = 100m

[mysqld_multi]
mysqld=/usr/local/mysql/bin/mysqld_safe
mysqladmin=/usr/local/mysql/bin/mysqladmin

[mysqldump]
quick
max_allowed_packet = 32M

可以看出，多实例的 my.cnf 实际上就是如上所示，本文为了演示实验环境，innodb_buffer_pool_size 仅仅开了 100m，真实的生产库中多实例部署该参数要开大些，两个实例该参数的值达到内存的 50%-80% 都可以。

下面开始初始化我们的数据库
首先创建我们的数据目录
[root@HE1 ~]#mkdir -p /data/mysql_3306
[root@HE1 ~]#mkdir -p /data/mysql_3308
[root@HE1 ~]#echo “export PATH=$PATH:/usr/local/mysql/bin:/usr/local/mysql/lib” >>/etc/profile

进入到 mysql 的 scripts 文件夹下对数据库进行初始化，这里我们对 3306 端口数据库进行初始化
[root@HE1 scripts]#./mysql_install_db –basedir=/usr/local/mysql –datadir=/data/mysql_3306 –defaults-file=/etc/my.cnf –user=mysql

这里我们对 3308 端口数据库进行初始化
[root@HE1 scripts]# ./mysql_install_db –basedir=/usr/local/mysql –datadir=/data/mysql_3308 –defaults-file=/etc/my.cnf –user=mysql

初始化完成后，我们便可以启停数据库了，和单实例不同，多实例采用 mysqld_multi 来启停数据库
[root@HE1 bin]# ./mysqld_multi –defaults-file=/etc/my.cnf –user=root –password=MANAGER start 3306,3308

可以利用 mysqld_multi 的 report 命令来检测多实例的运行状况
1234 [root@HE1 bin]#./mysqld_multi report
Reporting MySQL servers
MySQL server from group: mysqld3306 is running
MySQL server from group: mysqld3308 is running

登录方式和单实例大体相同，不过由于多实例的存在，我们需要指定不同的端口号
[root@HE1 bin]# mysql -uroot -p -P3306 -h 192.168.1.48
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 6 Server version: 5.6.16-log MySQL Community Server (GPL)

Copyright (c) 2000,
2014, 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> show databases;
+——————–+
| Database |
+——————–+
| information_schema
|
| 3306db |
| mysql |
| performance_schema
|
| test |
+——————–+
5 rows in set (0.00 sec)

当然，利用 socket 文件登录也是可以的
[root@HE1 bin]#mysql -uroot -p -S /data/mysql_3306/mysql_3306.sock
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 7 Server version: 5.6.16-log MySQL Community Server (GPL)

Copyright (c) 2000,
2014, 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> show databases;
+——————–+
| Database |
+——————–+
| information_schema
|
| 3306db |
| mysql |
| performance_schema
|
| test |
+——————–+
5 rows in set (0.00 sec)

这里是登录 3308 端口数据库
[root@HE1 bin]#mysql -uroot -p -P3308 -h 192.168.1.48
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 8 Server version: 5.6.16-log MySQL Community Server (GPL)

Copyright (c) 2000,
2014, 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.

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

mysql> show databases;
+——————–+
| Database |
+——————–+
| information_schema
|
| 3308db |
| mysql |
| performance_schema
|
| test |
+——————–+
5 rows in set (0.00sec)

mysql> quit
Bye

利用 3308 端口的 socket 文件登录数据库
[root@HE1 bin]#mysql -uroot -p -S /data/mysql_3308/mysql_3308.sock
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 9 Server version: 5.6.16-log MySQL Community Server (GPL)

Copyright (c) 2000,
2014, 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> show databases;
+——————–+
| Database |
+——————–+
| information_schema
|
| 3308db |
| mysql |
| performance_schema
|
| test |
+——————–+
5 rows in set (0.00sec)