Mysqld_multi可以管理多個幀聽不同Unix套接字文件和TCP/IP端口的連接的mysqld 進程。它可以啟動或停止服務器，或報告它們的當前狀態。
即可以管理多個實例。
筆者在之前也介紹過使用mysqld_safe啟用多實例的方法，啟動和關閉都指定配置文件，實例間是對立的，互不影響。成功的部署了多個實例主從Replication，今天也介紹下mysql_multi多實例管理，配置簡單，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 #根據自己的mysql目錄配置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、初始化數據庫目錄：
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
初始話成功，會提示OK，否則查看數據庫目錄是否有權限。 不初始發數據庫目錄，mysql會啟動不了！
3、啟動多實例：
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
注意這里的1、2對應my.cnf配置文件 mysqld1、mysqld2，以此來區分。
4、本機登錄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、關閉數據庫實例
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
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