Mysql利用mysql_multi配置一台主机多个实例

在Mysql官方帮助文档中，详细记录中Mysql的启动方式，有mysqld_safe、mysql.server、mysql_multi这三种。关于mysql_multi的介绍：

Mysqld_multi可以管理多个帧听不同Unix套接字文件和TCP/IP端口的连接的mysqld 进程。它可以启动或停止服务器，或报告它们的当前状态。

即可以管理多个实例。

笔者在之前也介绍过使用mysqld_safe启用多实例的方法，启动和关闭都指定配置文件，实例间是对立的，互不影响。成功的部署了多个实例主从Replication，今天也介绍下mysql_multi多实例管理，配置简单，方便管理。

1、首先配置my.cnf文件，列出我的Mysql配置文件：

[mysqld_multi]

mysqld = /usr/local/mysql/bin/mysqld_safe #根据自己的mysql目录配置

mysqladmin = /usr/local/mysql/bin/mysqladmin

[mysqld1]

port = 3306

socket = /tmp/mysql3306.sock

basedir=/usr/local/mysql

datadir=/mysqldata/data3306

log-slow-queries=slow_query.txt

long_query_time=2

skip-locking

skip-name-resolve

skip-innodb

max_allowed_packet = 256M

query_cache_size=256M

max_connections=2000

max_connect_errors=10000

key_buffer_size=6000M

read_buffer_size=32M

read_rnd_buffer_size = 32M

myisam_sort_buffer_size=512M

tmp_table_size=1024M

old-passwords

interactive_timeout=60

wait_timeout=60

connect_timeout=60

table_cache=8192

thread_cache_size=512

sort_buffer_size=128M

back_log = 500

thread_concurrency=48

expire_logs_days=10

log-bin=mysql-bin

[mysqld2]

port = 3307

socket = /tmp/mysql3307.sock

basedir=/usr/local/mysql

datadir=/mysqldata/data3307

log-slow-queries=slow_query.txt

long_query_time=2

skip-locking

skip-name-resolve

skip-innodb

max_allowed_packet = 256M

query_cache_size=256M

max_connections=2000

max_connect_errors=10000

key_buffer_size=6000M

read_buffer_size=32M

read_rnd_buffer_size = 32M

myisam_sort_buffer_size=512M

tmp_table_size=1024M

old-passwords

interactive_timeout=60

wait_timeout=60

connect_timeout=60

table_cache=8192

thread_cache_size=512

sort_buffer_size=128M

back_log = 500

thread_concurrency=48

expire_logs_days=10

log-bin=mysql-bin

[mysqldump]

quick

max_allowed_packet = 512M

[mysql]

no-auto-rehash

[isamchk]

key_buffer = 512M

sort_buffer_size = 32M

read_buffer = 2M

write_buffer = 2M

[myisamchk]

key_buffer = 512M

sort_buffer_size = 32M

read_buffer = 2M

write_buffer = 2M

[mysqlhotcopy]

interactive-timeout

2、初始化数据库目录：

shell>cd /usr/local/mysql/;./scripts/mysql_install_db --datadir=/mysqldata/data3307/ --user=mysql

shell>cd /usr/local/mysql/;./scripts/mysql_install_db --datadir=/mysqldata/data3306/ --user=mysql

初始话成功，会提示OK，否则查看数据库目录是否有权限。

3、启动多实例：

shell>/usr/local/mysql/bin/mysqld_multi start 1-2

或

shell>/usr/local/mysql/bin/mysqld_multi start 1

shell>/usr/local/mysql/bin/mysqld_multi start 2

注意这里的1、2对应my.cnf配置文件 mysqld1、mysqld2，以此来区分。

4、本机登录Mysql，如3307端口：

shell>mysql -S /tmp/mysql3307.sock

mysql> show variables like 'datadir';

+---------------+----------------------+

| Variable_name | Value |

+---------------+----------------------+

| datadir | /mysqldata/data3307/ |

+---------------+----------------------+

1 row in set (0.00 sec)

4、关闭数据库实例

shell>/usr/local/mysql/bin/mysqld_multi stop 1-2

或

shell>/usr/local/mysql/bin/mysqld_multi stop 1

shell>/usr/local/mysql/bin/mysqld_multi stop 2