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mysql集群技术

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1 环境描述

Mysql manager 节点:192.168.0.1

MysqlServer节点:192.168.0.100

Mysql 节点:192.168.0.160

Mysql 节点:192.168.0.161

说明:至少需要四台服务器才可以做mysql的集群。建议5台,再增加一台MysqlServer。

2 安装mysql二进制包2.1 安装之前的准备工作

下载mysql-max-4.1.13-pc-linux-gnu-i686.tar.gz包

(注意:可以做集群的mysql都是mysql-max的,下载地点www.mysql.org)

#groupadd mysql

#useradd -g mysql mysql

 

 

 

#cd /usr/local

#tar xfz mysql-max-4.1.13-pc-linux-gnu-i686.tar.gz

#ln -s /usr/local/mysql-max-4.1.13-pc-linux-gnu-i686 /opt/mysql4.1.13

2.2 分别在manager,server,node节点上安装二进制的mysql包

#cd mysql4.1.13

#scripts/mysql_install_db --user=mysql (必须带目录执行,否则出错)

#chown -R root /opt/mysql4.1.13

#chgrp -R mysql /opt/mysql4.1.13

#chown -R mysql.mysql /opt/mysql4.1.13/data

#cp support-files/mysql.server /etc/rc.d/init.d/ 配置mysql启动设置
#chmod x /etc/rc.d/init.d/mysql.server
#chkconfig --add mysql.server

3 配置server,note节点

在192.168.0.160和192.168.0.161机器上

# ./mysql –help 该命令可以查看mysql启动时是怎么寻找my.cnf文件的顺序。

Default options are read from the following files in the given order:

/etc/my.cnf /usr/local/mysql-max-4.1.13/data/my.cnf ~/.my.cnf

# cp support-files/my-medium.cnf data/my.cnf 将mysql的配置文件考到data下

Vi /usr/local/mysql-max-4.1.13-pc-linux-gnu-i686/data/my.cnf

 

ndbcluster

ndb-connectstring=192.168.0.1

 

ndb-connectstring=192.168.0.1

4 配置Management管理节点

在192.168.0.1机器上

#mkdir /var/lib/mysql-cluster

#cd /var/lib/mysql-cluster

#vi config.ini

# Options affecting ndbd processes on all data nodes:

NoOfReplicas=2 # Number of replicas

DataMemory=80M # How much memory to allocate for data storage

IndexMemory=52M # How much memory to allocate for index storage

# For DataMemory and IndexMemory, we have used the

# default values. Since the "world" database takes up

# only about 500KB, this should be more than enough for

# this example Cluster setup.

 

 

 

# TCP/IP options:

portnumber=2202 # This the default; however, you can use any

# port that is free for all the hosts in cluster

# Note: It is recommended beginning with MySQL 5.0 that

# you do not specify the portnumber at all and simply allow

# the default value to be used instead

# Management process options(定义管理节点.)

 

hostname=192.168.0.1 # 管理节点Hostname or IP address of MGM node

datadir=/var/lib/mysql-cluster # Directory for MGM node logfiles

# Options for data node "A"(定义群集数据节点.)

# (one section per data node)

 

hostname=192.168.0.160 # 节点Hostname or IP address

datadir=/usr/local/mysql/data # Directory for this data node's datafiles

# Options for data node "B"(定义群集数据节点.)

 

hostname=192.168.0.161 # 节点Hostname or IP address

datadir=/usr/local/mysql/data # Directory for this data node's datafiles

# SQL node options(定义Sql server节点.)

 

 

hostname=192.168.0.100 # SQL节点Hostname or IP address

 

#datadir=/usr/local/mysql/data # Directory for SQL node's datafiles

 

# (additional mysqld connections can be

 

# specified for this node for various

 

# purposes such as running ndb_restore)

 

:后面不能有任何注释信息,否则提示:

Error line 17: Unknown parameter: # Management process options

Error line 17: Could not parse name-value pair in config file.

: Defines shared-memory connections between nodes. 在MySQL 4.1.9之前,这个功能必须使用--with-ndb-shm option编译进去, 从MySQL 4.1.9-max版本开始, it is enabled by default

 

5 启动mysql集群5.1 初始化启动mysql集群服务

 

1)启动MysqlManagement管理节点(192.168.0.1)

#ndb_mgmd -f /var/lib/mysql-cluster/config.ini

2)启动Data Node节点(192.168.0.160,192.168.0.161)

#ndbd --initial

(注意:这个参数只能在第一次启动DataNode节点时使用,因为—initial参数会删除一些ndbd 实例先前创建的所有文件)

 

3)启动MysqlServer节点(192.168.0.100)

# ./mysql.server start

5.2 重启mysql集群服务

 

1)启动MysqlManagement管理节点(192.168.0.1)

#ndb_mgmd -f /var/lib/mysql-cluster/config.ini

2)启动Data Node节点(192.168.0.160,192.168.0.161)

#ndbd

3)启动MysqlServer节点(192.168.0.100)

# ./mysql.server start

(注意:Management管理节点和DataNote节点都不开启mysql服务,只有MysqlServer节点开启。The default port for Cluster management nodes is 1186; the default port for data nodes is 2202.)

6 测试集群的效果6.1 在管理机上查看各节点运行状况

 

# ./ndb_mgm

-- NDB Cluster -- Management Client --

ndb_mgm> show

Connected to Management Server at: localhost:1186

Cluster Configuration

---------------------

2 node(s)

id=2 @192.168.0.160 (Version: 4.1.13, Nodegroup: 0, Master)

id=3 @192.168.0.161 (Version: 4.1.12, Nodegroup: 0)

 

 

 

1 node(s)

id=1 @192.168.0.1 (Version: 4.1.13)

 

 

 

1 node(s)

id=4 @192.168.0.100 (Version: 4.1.12)

6.2 模拟写入一个数据库表,各MysqlServer节点是否能够同步

 

1) 在一个MysqlServer节点上创建数据库world和表,然后看看另一个MysqlServer节点是否也同样可以看到。

答:数据都相同

2) 拔掉一个DataNote节点网线,看看两台MysqlServer节点是否还能正常工作。

答:可以

3) 拔掉两台DataNote节点网线,查看一下MysqlServer节点是否还能正常工作。

答:所有MysqlServer都不能正常工作

7 附件:

以上文档参考mysql官方资料:http://dev.mysql.com/doc/mysql/en/ndbcluster.html

 

From: http://www.linuxjiaocheng.com/redhat-linux-kernel-software-tutorial/debian-server/howto-2320.html


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