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Mysql集群
1. 先了解一下你是否应该用MySQL集群。
减少数据中心结点压力和大数据量处理,采用把MySQL分布,一个或多个application对应一个MySQL数据库。把几个MySQL数据库公用的数据做出共享数据,例如购物车,用户对象等等,存在数据结点里面。其他不共享的数据还维持在各自分布的MySQL数据库本身中。
2. 集群MySQL中名称概念.(如上图)
1)Sql结点(SQL node--上图对应为MySQLd):分布式数据库。包括自身数据和查询中心结点数据.
2)数据结点(Data node -- ndbd):集群共享数据(内存中).
3)管理服务器(Management Server – ndb_mgmd):集群管理SQL node,Data node.
3.配置
MySQL-max版本,当然现在MySQL集群系统windonws平台上面不被支持.
安装MySQL就不多说了,网上一大堆,简明扼要。
A:192.168.1.251 – Data node和Management Server.
B:192.168.1.254 – SQL node.
当然,你也可以让一个机器同时为3者。
A,B my.inf加上:
<ol class="dp-sql"> <li class="alt">MySQLD] </li> <li>ndbcluster # run NDB engine </li> <li class="alt">ndb-connectstring=192.168.1.251 # location of MGM node </li> <li># Options for ndbd process: [MySQL_CLUSTER] </li> <li class="alt">ndb-connectstring=192.168.1.251 # location of MGM node </li> <li>A: /var/lib/MySQL-cluster/config.ini [NDBD DEFAULT] </li> <li class="alt">NoOfReplicas=1 </li> <li># Number of replicas DataMemory=80M </li> <li class="alt"># How much memory to allocate for data storage IndexMemory=18M </li> <li># How much memory to allocate for index storage </li> <li class="alt"># For DataMemory and IndexMemory, we have used the </li> <li># default values. Since the "world" database takes up </li> <li class="alt"># only about 500KB, this should be more than enough for </li> <li># this example Cluster setup. # TCP/IP options: [TCP DEFAULT] </li> <li class="alt">portnumber=2202 # This the default; however, you can use any </li> <li># port that is free for all the hosts in cluster </li> <li class="alt"># Note: It is recommended beginning with MySQL 5.0 that </li> <li># you do not specify the portnumber at all and simply allow </li> <li class="alt"># the default value to be used instead # Management process options: [NDB_MGMD] hostname=192.168.1.251 </li> <li># Hostname or IP address of MGM node datadir=/var/lib/MySQL-cluster # Directory for MGM node logfiles # Options for data node "A": [NDBD] </li> <li class="alt"># (one [NDBD] section per data node) hostname=192.168.1.251 </li> <li> # Hostname or IP address datadir=/usr/local/MySQL/data </li> <li class="alt"># Directory for this data node's datafiles </li> <li># SQL node options: [MySQLD] hostname=192.168.1.254 </li> <li class="alt">#[MySQLD] #这个相当于192.168.1.251 </li> </ol>