前言
大家應該都有所體會，隨著硬件層面的發展，linux系統多核已經是普通趨勢，而mysql是單進程多線程，所以先天上對多進程的利用不是很高，雖然5.6版本已經在這方面改進很多，但是也沒有達到100%，所以為了充分的利用系統資源，mysql有自己的補充，那就是可以部署多實例，一個實例一個端口。
mysqld_multi設計用于管理在同一臺機器上運行的多個mysqld進程，這些進程使用不同的socket文件并監聽在不同的端口上。mysqld_multi可以批量啟動、關閉、或者報告這些mysqld進程的狀態。
下面話不多說了，來一起看看詳細的介紹吧。
cd /usr/local/srcwget http://mirrors.sohu.com/mysql/MySQL-5.6/mysql-5.6.35-linux-glibc2.5-x86_64.tar.gz tar zxvf mysql-5.6.35-linux-glibc2.5-x86_64.tar.gzmv mysql-5.6.35-linux-glibc2.5-x86_64 /usr/local/mysqlcd /usr/local/mysqluseradd mysqlmkdir -p /data/mysqlchown -R mysql:mysql /data/mysql./scripts/mysql_install_db --user=mysql --datadir=/data/mysqlcp support-files/my-default.cnf /etc/my.cnfcp support-files/mysql.server /etc/init.d/mysqld
2.1 創建目錄：
mkdir /usr/local/mysql3307chown -R mysql.mysql /usr/local/mysql3307/mkdir -p /data/mysql3307chown -R mysql.mysql /data/mysql3307mkdir -p /home/data/mysql3307/binlogchown -R mysql.mysql /home/data/mysql3307
2.2 配置文件
[root@zhdya01 ~]# vim /etc/my.cnf# For advice on how to change settings please see# http://dev.mysql.com/doc/refman/5.6/en/server-configuration-defaults.html# *** DO NOT EDIT THIS FILE. It's a template which will be copied to the# *** default location during install, and will be replaced if you# *** upgrade to a newer version of MySQL.[mysqld_multi]mysqld = /usr/local/mysql/bin/mysqld_safemysqladmin =/usr/local/mysql/bin/mysqladminlog =/var/log/mysqld_multi.log[mysqld1]socket = /usr/local/mysql3307/mysql.sockport = 3307pid-file = /usr/local/mysql3307/mysql.piddatadir = /data/mysql3307log_bin=/home/data/mysql3307/binlogserver-id = 1innodb_buffer_pool_size = 128Minnodb_flush_log_at_trx_commit = 0
2.3 初始化數據庫
/usr/local/mysql/scripts/mysql_install_db --user=mysql --basedir=/usr/local/mysql --datadir=/data/mysql3307
3.1 創建目錄：
mkdir /usr/local/mysql3308chown -R mysql.mysql /usr/local/mysql3308/mkdir -p /data/mysql3308chown -R mysql.mysql /data/mysql3308mkdir -p /home/data/mysql3308/binlogchown -R mysql.mysql /home/data/mysql3308
3.2 配置文件
[root@zhdya01 ~]# vim /etc/my.cnf# For advice on how to change settings please see# http://dev.mysql.com/doc/refman/5.6/en/server-configuration-defaults.html# *** DO NOT EDIT THIS FILE. It's a template which will be copied to the# *** default location during install, and will be replaced if you# *** upgrade to a newer version of MySQL.[mysqld_multi]mysqld = /usr/local/mysql/bin/mysqld_safemysqladmin =/usr/local/mysql/bin/mysqladminlog =/var/log/mysqld_multi.log[mysqld1]socket = /usr/local/mysql3307/mysql.sockport = 3307pid-file = /usr/local/mysql3307/mysql.piddatadir = /data/mysql3307log_bin=/home/data/mysql3307/binlogserver-id = 1innodb_buffer_pool_size = 128Minnodb_flush_log_at_trx_commit = 0[mysqld2]socket = /usr/local/mysql3308/mysql.sockport = 3308pid-file = /usr/local/mysql3308/mysql.piddatadir = /data/mysql3308log_bin=/home/data/mysql3308/binlogserver-id = 2innodb_buffer_pool_size = 128Minnodb_flush_log_at_trx_commit = 0
3.3 初始化數據庫
/usr/local/mysql/scripts/mysql_install_db --user=mysql --basedir=/usr/local/mysql --datadir=/data/mysql3308
/etc/init.d/mysqld startmysqld_multi --defaults-extra-file=/etc/my.cnf start 1,2[root@zhdya01 bin]# !netnetstat -lntp -lntpActive Internet connections (only servers)Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1241/sshd tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 2087/master tcp6 0 0 :::3306 :::* LISTEN 4406/mysqld tcp6 0 0 :::3307 :::* LISTEN 4197/mysqld tcp6 0 0 :::3308 :::* LISTEN 3359/mysqld tcp6 0 0 :::8080 :::* LISTEN 2222/java tcp6 0 0 :::22 :::* LISTEN 1241/sshd tcp6 0 0 ::1:25 :::* LISTEN 2087/master
[root@zhdya01 bin]# mysqld_multi --defaults-extra-file=/etc/my.cnf reportReporting MySQL serversMySQL server from group: mysqld1 is runningMySQL server from group: mysqld2 is running
[root@zhdya01 bin]# mysqld_multi --defaults-extra-file=/etc/my.cnf stop 1,2[root@zhdya01 bin]# mysqld_multi --defaults-extra-file=/etc/my.cnf reportReporting MySQL serversMySQL server from group: mysqld1 is not runningMySQL server from group: mysqld2 is not running
[root@zhdya01 bin]# mysql --socket=/usr/local/mysql3307/mysql.sockWelcome to the MySQL monitor. Commands end with ; or /g.Your MySQL connection id is 1Server version: 5.6.35-log MySQL Community Server (GPL)Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.Type 'help;' or '/h' for help. Type '/c' to clear the current input statement.mysql>
總結
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