作為一名小白，在發(fā)現(xiàn)項目中環(huán)境崩潰的時候我果斷選擇了各種暴力刪除和重啟，經(jīng)過不斷的嘗試終于把Amoeba所在的環(huán)境徹底搞廢了。。。
項目場景
1、主數(shù)據(jù)庫服務(wù)器10.10.20.111作為寫庫，從數(shù)據(jù)庫服務(wù)器10.10.20.116作為讀庫
2、Amoeba安裝在主數(shù)據(jù)庫服務(wù)器上
準(zhǔn)備工作
1、安裝java環(huán)境
Amoeba是基于jdk1.5開發(fā)的，所以需要先安裝java環(huán)境，安裝步驟戳這里，jdk下載戳這里
2、安裝Amoeba
Amoeba下載戳這里，我下載的是amoeba-mysql-3.0.5-RC-distribution.zip。下載完成后將壓縮文件解壓到/usr/local/amoeba目錄下
Amoeba配置
Amoeba配置文件位于/usr/local/amoeba/conf目錄下，配置讀寫分離我們只需關(guān)注dbServers.xml和amoeba.xml
1、dbServers.xml
<?xml version="1.0" encoding="gbk"?>
<!DOCTYPE amoeba:dbServers SYSTEM "dbserver.dtd">
<amoeba:dbServers xmlns:amoeba="http://amoeba.meidusa.com/">
<!--
Each dbServer needs to be configured into a Pool,
If you need to configure multiple dbServer with load balancing that can be simplified by the following configuration:
add attribute with name virtual = "true" in dbServer, but the configuration does not allow the element with name factoryConfig
such as 'multiPool' dbServer
-->
<dbServer name="abstractServer" abstractive="true">
<factoryConfig class="com.meidusa.amoeba.mysql.net.MysqlServerConnectionFactory">
<property name="connectionManager">${defaultManager}</property>
<property name="sendBufferSize">64</property>
<property name="receiveBufferSize">128</property>
<!-- mysql port -->
#設(shè)置Amoeba要連接的mysql數(shù)據(jù)庫的端口，默認(rèn)是3306
<property name="port">3306</property>
<!-- mysql schema -->
#設(shè)置缺省的數(shù)據(jù)庫，當(dāng)連接amoeba時，操作表必須顯式的指定數(shù)據(jù)庫名，即采用dbname.tablename的方式，不支持 use dbname指定缺省庫，因?yàn)椴僮鲿{(diào)度到各個后端數(shù)據(jù)庫
<property name="schema">db</property>
<!-- mysql user -->
#設(shè)置amoeba連接后端數(shù)據(jù)庫服務(wù)器的賬號和密碼，因此需要在所有后端數(shù)據(jù)庫上創(chuàng)建該用戶，并授權(quán)amoeba服務(wù)器可連接
<property name="user">amoeba</property>
<property name="password">1234</property>
</factoryConfig>
<poolConfig class="com.meidusa.toolkit.common.poolable.PoolableObjectPool">
#最大連接數(shù)，默認(rèn)500
<property name="maxActive">500</property>
#最大空閑連接數(shù)
<property name="maxIdle">500</property>
#最小空閑連接數(shù)
<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>
#設(shè)置寫庫信息，名字可以任意命名
<dbServer name="master" parent="abstractServer">
<factoryConfig>
<!-- mysql ip -->
#寫庫既主數(shù)據(jù)庫服務(wù)器地址
<property name="ipAddress">10.10.20.111</property>
</factoryConfig>
</dbServer>
#設(shè)置讀庫信息，名字可以任意命名
<dbServer name="slave1" parent="abstractServer">
<factoryConfig>
<!-- mysql ip -->
#讀庫既從數(shù)據(jù)庫服務(wù)器地址
<property name="ipAddress">10.10.20.116</property>
</factoryConfig>
</dbServer>
</amoeba:dbServers>
2、amoeba.xml
<?xml version="1.0" encoding="gbk"?>
<!DOCTYPE amoeba:configuration SYSTEM "amoeba.dtd">
<amoeba:configuration xmlns:amoeba="http://amoeba.meidusa.com/">
<proxy>
<!-- service class must implements com.meidusa.amoeba.service.Service -->
<service name="Amoeba for Mysql" class="com.meidusa.amoeba.mysql.server.MySQLService">
<!-- port -->
#設(shè)置amoeba監(jiān)聽的端口，默認(rèn)是8066
<property name="port">8066</property>
<!-- bind ipAddress -->
#設(shè)置amoeba監(jiān)聽的地址，如果不設(shè)置，默認(rèn)監(jiān)聽所有地址
<!--
<property name="ipAddress">127.0.0.1</property>
-->
<property name="connectionFactory">
<bean class="com.meidusa.amoeba.mysql.net.MysqlClientConnectionFactory">
<property name="sendBufferSize">128</property>
<property name="receiveBufferSize">64</property>
</bean>
</property>
<property name="authenticateProvider">
<bean class="com.meidusa.amoeba.mysql.server.MysqlClientAuthenticator">
<!-- 登錄Amoeba的賬號密碼（這里的賬號密碼和amoeba連接后端數(shù)據(jù)庫服務(wù)器的密碼無關(guān)） -->
<property name="user">root</property>
<property name="password">root</property>
<property name="filter">
<bean class="com.meidusa.toolkit.net.authenticate.server.IPAccessController">
<property name="ipFile">${amoeba.home}/conf/access_list.conf</property>
</bean>
</property>
</bean>
</property>
</service>
<runtime class="com.meidusa.amoeba.mysql.context.MysqlRuntimeContext">
<property name="readThreadPoolSize">20</property>
<property name="clientSideThreadPoolSize">30</property>
<property name="serverSideThreadPoolSize">30</property>
<!-- proxy server client process thread size -->
<property name="executeThreadSize">128</property>
<!-- per connection cache prepared statement size -->
<property name="statementCacheSize">500</property>
<!-- default charset -->
<property name="serverCharset">utf8</property>
<!-- query timeout( default: 60 second , TimeUnit:second) -->
<property name="queryTimeout">60</property>
</runtime>
</proxy>
<!--
Each ConnectionManager will start as thread
manager responsible for the Connection IO read , Death Detection
-->
<connectionManagerList>
<connectionManager name="defaultManager" class="com.meidusa.toolkit.net.MultiConnectionManagerWrapper">
<property name="subManagerClassName">com.meidusa.toolkit.net.AuthingableConnectionManager</property>
</connectionManager>
</connectionManagerList>
<!-- default using file loader -->
<dbServerLoader class="com.meidusa.amoeba.context.DBServerConfigFileLoader">
<property name="configFile">${amoeba.home}/conf/dbServers.xml</property>
</dbServerLoader>
<queryRouter class="com.meidusa.amoeba.mysql.parser.MysqlQueryRouter">
<property name="ruleLoader">
<bean class="com.meidusa.amoeba.route.TableRuleFileLoader">
<property name="ruleFile">${amoeba.home}/conf/rule.xml</property>
<property name="functionFile">${amoeba.home}/conf/ruleFunctionMap.xml</property>
</bean>
</property>
<property name="sqlFunctionFile">${amoeba.home}/conf/functionMap.xml</property>
<property name="LRUMapSize">1500</property>
#設(shè)置amoeba默認(rèn)的池，這里設(shè)置為master
<property name="defaultPool">master</property>
#設(shè)置讀寫池，在上一個配置文件中已定義好
<property name="writePool">master</property>
<property name="readPool">slave1</property>
<property name="needParse">true</property>
</queryRouter>
</amoeba:configuration>
3、授權(quán)Amoeba
分別在主數(shù)據(jù)庫和從數(shù)據(jù)庫為Amoeba授權(quán)
mysql>grant all on db.* to 'amoeba'@'10.10.20.111' identified by '1234';
mysql>flush privileges;
4、啟動Amoeba
cd /usr/local/amoeba/bin
./launcher start
由于Amoeba的運(yùn)行是基于Java的，所以在初次運(yùn)行時由于stack size太小導(dǎo)致jvm啟動失敗。我們可以修改jvm.properties文件中的參數(shù)，然后重新啟動
vi /usr/local/amoeba/jvm.properties
#JVM_OPTIONS="-server -Xms256m -Xmx1024m -Xss196k -XX:PermSize=16m -XX:MaxPermSize=96m"
JVM_OPTIONS="-server -Xms256m -Xmx1024m -Xss512k"
測試讀寫分離
1、關(guān)閉MySQL主從同步功能，在從數(shù)據(jù)庫服務(wù)器中執(zhí)行
mysql>stop slave;
2、登錄Amoeba，插入數(shù)據(jù)
mysql -uroot -proot -P8066
mysql>use db;
mysql>insert into test(name) values('amoeba');
mysql>select * from test;
并沒有查到新增的數(shù)據(jù)
3、登錄主數(shù)據(jù)庫服務(wù)器
mysql -uroot -proot
mysql>use db;
mysql>select * from test;
可以看到剛才新增的數(shù)據(jù)
4、從數(shù)據(jù)庫服務(wù)器開啟MySQL主從同步
mysql>start slave;
5、在Amoeba中重新查詢
mysql>select * from test
現(xiàn)在可以查到新增的數(shù)據(jù)了，說明寫是在主數(shù)據(jù)庫執(zhí)行，查是在從數(shù)據(jù)庫執(zhí)行
