mysql多实例安装
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多实例部署优势:
- 充分利用系统资源
- mysql为单进程多线程的模型,它对多核的利用不是很好,无法充分利用系统资源。所以服务器上可以考虑多实例部署
- 资源隔离
- 如果不同的业务,部署在一个实例里,那么连接数、缓存等资源都是共享的。如果某个业务压力很大的话,很可能影响另一个业务的正常运行
- 业务、模块隔离
- 例如,A业务需要支持移动端,那么久需要升级数据库以支持utf8mb4字符集。而B业务则不需要。如果A、B是部署在一起的话,升级数据库必然会对B的业务造成影响
1 部署好mysql软件
[root@miles ~]# ps -ef |grep mysqldroot 3083 1 0 Dec03 ? 00:00:00 /bin/sh /usr/local/mysql5.6.27/bin/mysqld_safe --defaults-file=/data/my.cnfmysql 3431 3083 0 Dec03 ? 00:00:47 /usr/local/mysql5.6.27/bin/mysqld --defaults-file=/data/my.cnf --basedir=/usr/local/mysql5.6.27 --datadir=/data/mysql/ --plugin-dir=/usr/local/mysql5.6.27/lib/plugin --user=mysql --log-error=/data/mysql/error.log --pid-file=/data/mysql//miles.pid --socket=/data/mysql.sock --port=3333实例初始化[root@miles ~]# mkdir /data/mysql2[root@miles ~]# /usr/local/mysql5.6.27/scripts/mysql_install_db --user=mysql --datadir=/data/mysql2 --basedir=/usr/local/mysql5.6.27
2 编辑多个配置文件,初始化多个实例
[mysql@miles data]$ cp my.cnf my1.cnf[mysql@miles data]$ pwd/data[mysql@miles data]$ vi my1.cnf 修改相关文件路径:%s#data/mysql#data/mysql2#g修改端口号:%s#3334#data/3334#g
3 启动mysql实例
[root@miles ~]# /usr/local/mysql5.6.27/bin/mysqld_safe --defaults-file=/data/my1.cnf &[root@miles ~]# ps -ef |grep mysqldroot 3083 1 0 Dec03 ? 00:00:00 /bin/sh /usr/local/mysql5.6.27/bin/mysqld_safe --defaults-file=/data/my.cnfmysql 3431 3083 0 Dec03 ? 00:00:53 /usr/local/mysql5.6.27/bin/mysqld --defaults-file=/data/my.cnf --basedir=/usr/local/mysql5.6.27 --datadir=/data/mysql/ --plugin-dir=/usr/local/mysql5.6.27/lib/plugin --user=mysql --log-error=/data/mysql/error.log --pid-file=/data/mysql//miles.pid --socket=/data/mysql.sock --port=3333root 13531 11356 0 15:17 pts/0 00:00:00 /bin/sh /usr/local/mysql5.6.27/bin/mysqld_safe --defaults-file=/data/my1.cnfmysql 13881 13531 43 15:17 pts/0 00:00:03 /usr/local/mysql5.6.27/bin/mysqld --defaults-file=/data/my1.cnf --basedir=/usr/local/mysql5.6.27 --datadir=/data/mysql2/ --plugin-dir=/usr/local/mysql5.6.27/lib/plugin --user=mysql --log-error=/data/mysql2/error.log --pid-file=/data/mysql2//miles.pid --socket=/data/mysql2.sock --port=3334账户安全设置[root@miles ~]# mysql -uroot --socket=/data/mysql2.sockmysql> select user,host,password from mysql.user;+------+-----------+----------+| user | host | password |+------+-----------+----------+| root | localhost | || root | miles | || root | 127.0.0.1 | || root | ::1 | || | localhost | || | miles | |+------+-----------+----------+6 rows in set (0.00 sec)mysql> delete from user where user='';ERROR 1046 (3D000): No database selectedmysql> delete from mysql.user where user='';Query OK, 2 rows affected (0.01 sec)mysql> delete from mysql.user where host<>'localhost';Query OK, 3 rows affected (0.01 sec)mysql> set password for root@localhost = password('beijing');Query OK, 0 rows affected (0.00 sec)mysql> delete from mysql.db;Query OK, 2 rows affected (0.01 sec)mysql> drop database test;Query OK, 0 rows affected (0.02 sec)mysql> flush privileges;Query OK, 0 rows affected (0.00 sec)
5 mysqld_multi的配置
配置多实例启动脚本[root@miles support-files]# pwd/usr/local/mysql5.6.27/support-filesYou have new mail in /var/spool/mail/root[root@miles support-files]# cp mysqld_multi.server /etc/init.d/mysqld_multi.server[root@miles support-files]# vi /etc/init.d/mysqld_multi.serverbasedir=/usr/local/mysql5.6.27bindir=/usr/local/mysql5.6.27/bin配置多实例数据库配置文件 用mysqld_multi工具查看该配置文件的模板方法,命令为:mysqld_multi --example 在/etc/目录下创建创建文件/etc/mysqld_multi.cnf,把mysqld_multi --example产生的文件粘进去,修改相应属性,如:mysqld,mysqladmin,socket,port,pid-file,datadir,user等。[root@miles ~]# more /data/mysqld_multi.cnf [mysqld_multi] mysqld = /usr/local/mysql5.6.27/bin/mysqld_safe mysqladmin = /usr/local/mysql5.6.27/bin/mysqladmin user =root password =beijing [mysqld1] defaults-file = /data/my.cnfsocket = /data/mysql.sock port = 3333 #pid-file = /data/mysql/mysql.pid datadir = /data/mysql #language = /usr/local/mysql5.6.27/share/mysql/english user = mysql [mysqld2] defaults-file = /data/my1.cnfsocket = /data/mysql2.sock port = 3334 #pid-file = /data/mysql2/mysql.pid datadir = /data/mysql2 #language = /usr/local/mysql5.6.27/share/mysql/english user = mysql查看数据库状态 [root@miles ~]# mysqld_multi --defaults-extra-file=/data/mysqld_multi.cnf reportReporting MySQL serversMySQL server from group: mysqld1 is runningMySQL server from group: mysqld2 is running启动数据库实例1,2[root@miles ~]# mysqld_multi --defaults-extra-file=/data/mysqld_multi.cnf start 1,2关闭数据库实例1,2[root@miles ~]# mysqld_multi --defaults-extra-file=/data/mysqld_multi.cnf stop 1,2 -p beijing启动数据库实例1[root@miles ~]# mysqld_multi --defaults-extra-file=/data/mysqld_multi.cnf start 1
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