MySQL数据库集群配置_MySQL
Mysql集群
bitsCN.com转:http://server.ccw.com.cn/yyjq/htm2010/20100624_870385.shtml
收藏,备用。
此文章主要向大家讲述的是对MySQL数据库集群进行正确配置的实际操作步骤,以及对其概念的讲述,如果你对其相关的实际操作有兴趣了解的话,以下的文章将会给你提供相关的知识。
一、介绍
这篇文档旨在介绍如何安装配置基于2台服务器的MySQL数据库集群。并且实现任意一台服务器出现问题或宕机时MySQL依然能够继续运行。
注意!
虽然这是基于2台服务器的MySQL集群,但也必须有额外的第三台服务器作为管理节点,但这台服务器可以在集群启动完成后关闭。同时需要注意的是 并不推荐在集群启动完成后关闭作为管理节点的服务器。尽管理论上可以建立基于只有2台服务器的MySQL集群,但是这样的架构,一旦一台服务器宕机之后集 群就无法继续正常工作了,这样也就失去了集群的意义了。出于这个原因,就需要有第三台服务器作为管理节点运行。
另外,可能很多朋友都没有3台服务器的实际环境,可以考虑在VMWare或其他虚拟机中进行实验。
下面假设这3台服务的情况:
Server1: mysql1.vmtest.net 192.168.0.1
Server2: mysql2.vmtest.net 192.168.0.2
Server3: mysql3.vmtest.net 192.168.0.3
Servers1和Server2作为实际配MySQL数据库集群的服务器。对于作为管理节点的Server3则要求较低,只需对Server3的系 统进行很小的调整并且无需安装MySQL,Server3可以使用一台配置较低的计算机并且可以在Server3同时运行其他服务。
二、在Server1和Server2上安装MySQL
注意:必须是max版本的MySQL,Standard版本不支持集群部署!
以下步骤需要在Server1和Server2上各做一次
1 # mv mysql-max-4.1.9-pc-linux-gnu-i686.tar.gz /usr/local/ 2 # cd /usr/local/ 3 # groupadd mysql 4 # useradd -g mysql mysql 5 # tar -zxvf mysql-max-4.1.9-pc-linux-gnu-i686.tar.gz 6 # rm -f mysql-max-4.1.9-pc-linux-gnu-i686.tar.gz 7 # mv mysql-max-4.1.9-pc-linux-gnu-i686 mysql 8 # cd mysql 9 # scripts/mysql_install_db --user=mysql 10 # chown -R root . 11 # chown -R mysql data 12 # chgrp -R mysql . 13 # cp support-files/mysql.server /etc/rc.d/init.d/mysqld 14 # chmod +x /etc/rc.d/init.d/mysqld 15 # chkconfig --add mysqld
此时不要启动MySQL!
三、安装并配置管理节点服务器(Server3)
作为管理节点服务器,Server3需要ndb_mgm和ndb_mgmd两个文件:
从http://www.mysql.com上下载mysql-max-4.1.9-pc-linux-gnu-i686.tar.gz
1 # mkdir /usr/src/mysql-mgm 2 # cd /usr/src/mysql-mgm 3 # tar -zxvf mysql-max-4.1.9-pc-linux-gnu-i686.tar.gz 4 # rm mysql-max-4.1.9-pc-linux-gnu-i686.tar.gz 5 # cd mysql-max-4.1.9-pc-linux-gnu-i686 6 # mv bin/ndb_mgm . 7 # mv bin/ndb_mgmd . 8 # chmod +x ndb_mg* 9 # mv ndb_mg* /usr/bin/ 10 # cd # rm -rf /usr/src/mysql-mgm
在开始为这台管理节点服务器建立配置文件:
1 # mkdir /var/lib/mysql-cluster 2 # cd /var/lib/mysql-cluster 3 # vi config.ini
在config.ini中添加如下内容:
[NDBD DEFAULT] NoOfReplicas=2 [MYSQLD DEFAULT] [NDB_MGMD DEFAULT] [TCP DEFAULT] # Managment Server [NDB_MGMD] HostName=192.168.0.3 #管理节点服务器Server3的IP地址 # Storage Engines [NDBD] HostName=192.168.0.1 #MySQL数据库集群Server1的IP地址 DataDir= /var/lib/mysql-cluster [NDBD] HostName=192.168.0.2 #MySQL数据库集群Server2的IP地址 DataDir=/var/lib/mysql-cluster
以下2个[MYSQLD]可以填写Server1和Server2的主机名。
但为了能够更快的更换集群中的服务器,推荐留空,否则更换服务器后必须对这个配置进行更改。
[MYSQLD] [MYSQLD]
保存退出后,启动管理节点服务器Server3:
# ndb_mgmd
启动管理节点后应该注意,这只是管理节点服务,并不是管理终端。因而你看不到任何关于启动后的输出信息。
四、配置集群服务器并启动MySQL
在Server1和Server2中都需要进行如下改动:
1 # vi /etc/my.cnf 2 3 [mysqld] 4 5 ndbcluster 6 7 ndb-connectstring=192.168.0.3 #Server3的IP地址 8 [mysql_cluster] 9 10 ndb-connectstring=192.168.0.3 #Server3的IP地址
保存退出后,建立数据目录并启动MySQL:
1 # mkdir /var/lib/mysql-cluster 2 # cd /var/lib/mysql-cluster 3 # /usr/local/mysql/bin/ndbd --initial 4 # /etc/rc.d/init.d/mysqld start
可以把/usr/local/mysql/bin/ndbd加到/etc/rc.local中实现开机启动。
注意:只有在第一次启动ndbd时或者对Server3的config.ini进行改动后才需要使用--initial参数!
五、检查工作状态
回到管理节点服务器Server3上,并启动管理终端:
# /usr/bin/ndb_mgm 键入show命令查看当前工作状态:(下面是一个状态输出示例)
[root@mysql3 root]# /usr/bin/ndb_mgm -- NDB Cluster -- Management Client -- ndb_mgm> show Connected to Management Server at: localhost:1186 Cluster Configuration [ndbd(NDB)] 2 node(s) id=2 @192.168.0.1 (Version: 4.1.9, Nodegroup: 0, Master) id=3 @192.168.0.2 (Version: 4.1.9, Nodegroup: 0) [ndb_mgmd(MGM)] 1 node(s) id=1 @192.168.0.3 (Version: 4.1.9) [mysqld(API)] 2 node(s) id=4 (Version: 4.1.9) id=5 (Version: 4.1.9) ndb_mgm>
如果上面没有问题,现在开始测试MySQL:
注意,这篇文档对于MySQL并没有设置root密码,推荐你自己设置Server1和Server2的MySQL root密码。
在Server1中:
# /usr/local/mysql/bin/mysql -u root -p > use test; > CREATE TABLE ctest (i INT) ENGINE=NDBCLUSTER; > INSERT INTO ctest () VALUES (1); > SELECT * FROM ctest; 应该可以看到1 row returned信息(返回数值1)。
如果上述正常,则换到Server2上重复上面的测试,观察效果。如果成功,则在Server2中执行INSERT再换回到Server1观察是否工作正常。
如果都没有问题,那么恭喜成功!
六、破坏性测试
将Server1或Server2的网线拔掉,观察另外一台MySQL数据库集群服务器工作是否正常(可以使用SELECT查询测试)。测试完毕后,重新插入网线即可。
如果你接触不到物理服务器,也就是说不能拔掉网线,那也可以这样测试:
在Server1或Server2上:
# ps aux | grep ndbd 将会看到所有ndbd进程信息:
root 5578 0.0 0.3 6220 1964 ? S 03:14 0:00 ndbd
root 5579 0.0 20.4 492072 102828 ? R 03:14 0:04 ndbd
root 23532 0.0 0.1 3680 684 pts/1 S 07:59 0:00 grep ndbd
然后杀掉一个ndbd进程以达到破坏MySQL集群服务器的目的:
# kill -9 5578 5579
之后在另一台集群服务器上使用SELECT查询测试。并且在管理节点服务器的管理终端中执行show命令会看到被破坏的那台服务器的状态。
测试完成后,只需要重新启动被破坏服务器的ndbd进程即可:
# ndbd 注意!前面说过了,此时是不用加--inital参数的!
至此,MySQL数据库集群就配置完成了!

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