Mysql利用mysql_multi配置一台主机多个实例_MySQL

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    = 3306socket    = /tmp/mysql3306.sockbasedir=/usr/local/mysqldatadir=/mysqldata/data3306log-slow-queries=slow_query.txtlong_query_time=2skip-lockingskip-name-resolveskip-innodbmax_allowed_packet = 256Mquery_cache_size=256Mmax_connections=2000max_connect_errors=10000key_buffer_size=6000Mread_buffer_size=32Mread_rnd_buffer_size = 32Mmyisam_sort_buffer_size=512Mtmp_table_size=1024Mold-passwordsinteractive_timeout=60wait_timeout=60connect_timeout=60table_cache=8192thread_cache_size=512sort_buffer_size=128Mback_log = 500thread_concurrency=48expire_logs_days=10log-bin=mysql-bin[mysqld2]port    = 3307socket    = /tmp/mysql3307.sockbasedir=/usr/local/mysqldatadir=/mysqldata/data3307log-slow-queries=slow_query.txtlong_query_time=2skip-lockingskip-name-resolveskip-innodbmax_allowed_packet = 256Mquery_cache_size=256Mmax_connections=2000max_connect_errors=10000key_buffer_size=6000Mread_buffer_size=32Mread_rnd_buffer_size = 32Mmyisam_sort_buffer_size=512Mtmp_table_size=1024Mold-passwordsinteractive_timeout=60wait_timeout=60connect_timeout=60table_cache=8192thread_cache_size=512sort_buffer_size=128Mback_log = 500thread_concurrency=48expire_logs_days=10log-bin=mysql-bin[mysqldump]quickmax_allowed_packet = 512M[mysql]no-auto-rehash[isamchk]key_buffer = 512Msort_buffer_size = 32Mread_buffer = 2Mwrite_buffer = 2M[myisamchk]key_buffer = 512Msort_buffer_size = 32Mread_buffer = 2Mwrite_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=mysqlshell>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。 不初始发数据库目录，mysql会启动不了！

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 1shell>/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.sockmysql> 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 1shell>/usr/local/mysql/bin/mysqld_multi stop 2