amoeba

Amoeba

原理：amoeba相当于业务员，处理client的读写请求，并将读写请求分开处理。amoeba和master以及slave都有联系，如果是读的请求，amoeba就从slave读取信息反馈给client；如果是写的请求，amoeba会将相关数据写入master。

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• mysql的主从复制：一台负责mysql的写操作，一台负责mysql的读操作

• java的配置环境

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安装amoeba

[root@server2 software]# mkdir /usr/local/amoeba
[root@server2 software]# wget http://softlayer.dl.sourceforge.net/project/amoeba/Amoeba%20for%20mysql/2.x/amoeba-mysql-binary-2.1.0-RC5.tar.gz
[root@server2 software]# tar xzf amoeba-mysql-binary-2.1.0-RC5.tar.gz -C /usr/local/amoeba

配置用户环境变量

在～/.bash_profile文件中指定

    PATH=$PATH:$HOME/bin:/usr/local/amoeba/bin
    JAVA_HOME=/usr/java/jdk1.6.0_32
    export JAVA_HOME
    export PATH

立即生效文件

	source  ~/.bash_profile

配置amoeba

• /usr/local/amoeba/conf/dbServers.xml
  
  定义amoeba代理的数据库的链接：主机IP、端口、Amoeba使用的用户名和密码等等

<dbServer name="abstractServer" abstractive="true">
	<factoryConfig class="com.meidusa.amoeba.mysql.net.MysqlServerConnectionFactory">
    	<property name="manager">${defaultManager}</property>
		<property name="sendBufferSize">64</property>
		<property name="receiveBufferSize">128</property>

		<!-- mysql port -->
		<property name="port">3306</property>

		<!-- mysql schema -->
		<property name="schema">test</property>

		<!-- mysql user -->
		<property name="user">root</property>

		<!--  mysql password
		<property name="password">password</property>
		-->
	</factoryConfig>

	<poolConfig class="com.meidusa.amoeba.net.poolable.PoolableObjectPool">
		<property name="maxActive">500</property>
		<property name="maxIdle">500</property>
		<property name="minIdle">10</property>
		<property name="minEvictableIdleTimeMillis">600000</property>
		<property name="timeBetweenEvictionRunsMillis">600000</property>
		<property name="testOnBorrow">true</property>
		<property name="testWhileIdle">true</property>
	</poolConfig>
</dbServer>

以上内容定义了真实mysql服务器的端口，名称，用户以及密码等

<dbServer name="Master"  parent="abstractServer">
	<factoryConfig>
    	<!-- mysql ip -->
        <property name="ipAddress">192.168.0.1</property>
	</factoryConfig>
</dbServer>
<dbServer name="Slave1"  parent="abstractServer">
	<factoryConfig>
    	<!-- mysql ip -->
        <property name="ipAddress">192.168.0.2</property>
	</factoryConfig>
</dbServer>
<dbServer name="Slave2"  parent="abstractServer">
	<factoryConfig>
    	<!-- mysql ip -->
        <property name="ipAddress">192.168.0.3</property>
	</factoryConfig>
</dbServer>
<dbServer name="virtualSlave" virtual="true">
	<poolConfig class="com.meidusa.amoeba.server.MultipleServerPool">
    	<!-- Load balancing strategy: 1=ROUNDROBIN , 2=WEIGHTBASED , 3=HA-->
        <property name="loadbalance">1</property>

        <!-- Separated by commas,such as: server1,server2,server1 -->
        <property name="poolNames">Slave1,Slave2</property>
	</poolConfig>
</dbServer>
<dbServer name="Master"  parent="abstractServer">
	<factoryConfig>
		<!-- mysql ip -->
		<property name="ipAddress">192.168.0.1</property>
	</factoryConfig>
</dbServer>
<dbServer name="Slave1"  parent="abstractServer">
	<factoryConfig>
    	<!-- mysql ip -->
        <property name="ipAddress">192.168.0.2</property>
	</factoryConfig>
</dbServer>
<dbServer name="Slave2"  parent="abstractServer">
	<factoryConfig>
		<!-- mysql ip -->
        <property name="ipAddress">192.168.0.3</property>
	</factoryConfig>
</dbServer>
<dbServer name="virtualSlave" virtual="true">
	<poolConfig class="com.meidusa.amoeba.server.MultipleServerPool">
    	<!-- Load balancing strategy: 1=ROUNDROBIN , 2=WEIGHTBASED , 3=HA-->
        <property name="loadbalance">1</property>

        <!-- Separated by commas,such as: server1,server2,server1 -->
        <property name="poolNames">Slave1,Slave2</property>
	</poolConfig>
</dbServer>

以上内容用于定义主从服务器的链接

• /usr/local/amoeba/conf/amoeba.xml

定义Amoeba代理的相关配置

<property name="authenticator">
	<bean class="com.meidusa.amoeba.mysql.server.MysqlClientAuthenticator">

        <property name="user">root</property>

        <property name="password"></property>

        <property name="filter">
			<bean class="com.meidusa.amoeba.server.IPAccessController">
            	<property name="ipFile">${amoeba.home}/conf/access_list.conf</property>
			</bean>
		</property>
	</bean>
</property>

定义连接amoeba时用来验证的用户及密码

<property name="defaultPool">Master</property>
	<property name="writePool">Master</property>
	<property name="readPool">virtualSlave</property>

defaultPool:配置了默认的数据库节点

writePool :配置了数据库写库，通常配为Master，如这里就配置为之前定义的Master数据库。

readPool :配置了数据库读库，通常配为Slave或者Slave组成的数据库池，如这里就配置之前的virtualSlave数据库池。

启动amoeba

启动命令

amoeba start

此命令以前台的方式启动，会输出启动时的信息，检查没有错误信息后，中断，并后台运行

amoeba start &