--------client--------------amoeba-------------主MySQL----------------从MySQL------------从MySQL---------
192.168.1.10 192.168.1.100 192.168.1.200 192.168.1.201 192.168.1.202
构建步骤：
一、在amoeba服务器中：
安装java环境
1、安装java
[root@localhost ~]# chmod +x jdk-6u14-linux-x64.bin
[root@localhost ~]# ./jdk-6u14-linux-x64.bin //输yes,按回车
[root@localhost ~]# mv jdk1.6.0_14/ /usr/local/java
[root@localhost ~]# rm -rf /usr/bin/java //删除原有的java
[root@localhost ~]# rm -rf /usr/bin/javac //删除原有的javac
[root@localhost ~]# ln -s /usr/local/java/bin/* /usr/bin/java
[root@localhost ~]# vim /etc/profile
添加：
export JAVA_HOME=/usr/local/java
export CLASSPATH=$CLASSPATH:$JAVA_HOME:/lib:$JAVA_HOME/jre/lib
export PATH=$JAVA_HOME/lib:$JAVA_HOME/bin:$PATH:$HOME/bin
export AMOEBA_HOME=/usr/local/amoeba
export PATH=$PATH:$AMOEBA/bin
[root@localhost ~]# source /etc/profile
[root@localhost ~]# java -version
2、安装amoeba（变形虫）
[root@localhost ~]# mkdir /usr/local/amoeba
[root@localhost ~]# tar -zxvf amoeba-mysql-binary-2.2.0.tar.gz -C /usr/local/amoeba/
[root@localhost ~]# chmod 755 /usr/local/amoeba/ -R
[root@localhost ~]# /usr/local/amoeba/bin/amoeba //验证amoeba是否安装成功
[root@localhost ~]# /usr/local/amoeba/bin/amoeba start & //启动amoeba
[root@localhost ~]# netstat -anpt | grep java
3、配置Amoeba（实现读写分离，两个Slave读负载均衡）
1）主MySQL服务器、从MySQL服务器（2台）开放权限
[root@localhost ~]# mysql -u root -p redhat
mysql> grant all on *.* to 'root'@'192.168.1.%' identified by 'redhat';
2）修改amoeba配置文件
[root@localhost ~]# vim /usr/local/amoeba/conf/amoeba.xml
修改：
<property name="authenticator">
<property name="user">amoeba</property> //修改
<property name="password">redhat</property> //修改
<queryRouter class="com.meidusa.amoeba.mysql.parser.MysqlQueryRouter">
<property name="LRUMapSize">1500</property>
<property name="defaultPool">master</property> //修改
<property name="writePool">master</property> //修改
<property name="readPool">slaves</property> //修改
<property name="needParse">true</property>
3）修改dbServer.xml配置文件
[root@localhost ~]# vim /usr/local/amoeba/conf/dbServers.xml
修改：
<factoryConfig class="com.meidusa.amoeba.mysql.net.MysqlServerConnectionFactory">
<!-- mysql user -->
<property name="user">root</property> //修改用户为root
<!-- mysql password -->
<property name="password">redhat</property> //修改密码
</factoryConfig>
...部分省略....
<dbServer name="master" parent="abstractServer"> //修改服务名称为master
<factoryConfig>
<!-- mysql ip -->
<property name="ipAddress">192.168.1.200</property> //修改为主数据库服务器的IP
</factoryConfig>
</dbServer>
<dbServer name="slave1" parent="abstractServer"> //修改服务名称为slave1
<factoryConfig>
<!-- mysql ip -->
<property name="ipAddress">192.168.1.201</property> //修改为从数据库服务器的IP
</factoryConfig>
</dbServer>
<dbServer name="slave2" parent="abstractServer"> //修改服务名称为slave2
<factoryConfig>
<!-- mysql ip -->
<property name="ipAddress">192.168.1.202</property> //修改为从数据库服务器的IP
</factoryConfig>
</dbServer>
<dbServer name="slaves" virtual="true"> //修改为 slaves
<poolConfig class="com.meidusa.amoeba.server.MultipleServerPool"
<property name="loadbalance">1</property>
<property name="poolNames">slave1,slave2</property> //修改为 slave1,slave2
</poolConfig>
</dbServer>
[root@localhost ~]# /usr/local/amoeba/bin/amoeba stop
[root@localhost ~]# /usr/local/amoeba/bin/amoeba start &
[root@localhost ~]# netstat -anpt | grep java
二、MySQL数据库服务器中（三台）：
1、在主数据库上安装ntp时间服务
[root@localhost ~]# yum -y install ntp
[root@localhost ~]# vim /etc/ntp.conf
添加：
server 127.127.1.0
fudge 127.127.1.0 stratum 8
[root@localhost ~]# service ntpd restart
2、在从数据库上安装ntp时间服务
[root@localhost ~]# yum -y install ntpdate
[root@localhost ~]# ntpdate 192.168.1.1
3、安装MySQL服务（三台数据库服务器安装保持一致）
1）安装cmake软件
[root@localhost ~]# tar -zxvf cmake-2.8.6.tar.gz -C /usr/src/
[root@localhost ~]# cd /usr/src/cmake-2.8.6/
[root@localhost cmake-2.8.6]# ./configure && gmake && gmake install
2）安装mysql软件
[root@localhost ~]# tar -zxvf mysql-5.5.22.tar.gz -C /usr/src/
[root@localhost ~]# cd /usr/src/mysql-5.5.22/
[root@localhost mysql-5.5.22]# cmake -
DCMAKE_INSTALL_PREFIX=/usr/local/mysql -DDEFAULT_CHARSET=utf8 -
DDEFAULT_COLLATION=utf8_general_ci -DSYSCONFDIR=/etc -
DWITH_EXTRA_CHARSETS=all
[root@localhost mysql-5.5.22]# make && make install
[root@localhost ~]# cp /usr/src/mysql-5.5.22/support-files/mymedium.
cnf /etc/my.cnf
[root@localhost ~]# cp /usr/src/mysql-5.5.22/support-files/mysql.server
/etc/init.d/mysqld
[root@localhost ~]# chmod +x /etc/init.d/mysqld
[root@localhost ~]# chown -R mysql:mysql /usr/local/mysql
[root@localhost ~]# ln -s /usr/local/mysql/bin/* /usr/local/bin/
[root@localhost ~]# /usr/local/mysql/scripts/mysql_install_db --
user=mysql --basedir=/usr/local/mysql/ --datadir=/usr/local/mysql/data/
[root@localhost ~]# service mysqld restart
[root@localhost ~]# chkconfig --add mysqld
[root@localhost ~]# chkconfig mysqld on
验证：
[root@localhost ~]# mysqladmin -u root password 'redhat'
[root@localhost ~]# mysql -u root -p
4、主从配置
1）主数据库服务器配置
[root@localhost ~]# vim /etc/my.cnf
添加：
server-id=11 //修改
log-bin=master-bin //修改
log-slave-updates=true //添加
[root@localhost ~]# service mysqld restart
[root@localhost ~]# mysql -u root -p
mysql> grant replication slave on *.* to 'slave'@'192.168.1.%' identified by 'redhat';
mysql> flush privileges;
mysql> show master status;
mysql> quit
2）从数据库服务器配置
[root@localhost ~]# vim /etc/my.cnf
添加：
server-id=22 //修改
relay-log=relay-log-bin //添加
relay-log-index=slave-relay-bin.index //添加
注意：主—从的ID不能相同。
[root@localhost ~]# service mysqld restart
[root@localhost ~]# mysql -u root -p
mysql> change master to
master_host='192.168.1.200',
master_user='slave',
master_password='redhat',
master_log_file='master-bin.000001',
master_log_pos=336;
mysql> start slave;
mysql> show slave statusG; //结尾不能加; 否则或报错。
Slave_IO_Running: Yes //确保为YES
Slave_SQL_Running: Yes //确保为YES
mysql> quit
问题说明：
1、如果出现ERROR: No query specified
则：原因是语法错误，去掉语句后的;号。
2、如果bin-log日志不更新，或者无法进行数据同步，
则：删除bin-log日志，重新启动服务即可。
3、导致lave_IO_Running 为connecting 的原因主要有以下 3 个方面：
1）网络不通
2）密码不对
3）pos不对
4、验证：
1）主数据库服务器：
[root@localhost ~]# mysql -u root -p
mysql> show databases;
mysql> create database masterdb;
mysql> show databases;
mysql> use masterdb;
mysql> create table count (id int(5),name char(12));
mysql> show tables;
mysql> quit
2)从数据库服务器：
[root@localhost ~]# mysql -u root -p
mysql> show databases;
mysql> show databases;
mysql> use masterdb
mysql> show tables;
mysql> quit
三、验证：
1、在client上：
[root@localhost ~]# mysql -u amoeba -p123456 -h 192.168.1.100 -P8066
mysql> use masterdb;
mysql> create table biao1 (id int(5),name char(10),address char(10));
2、在主MySQL服务器上：
mysql> insert into biao1 values(1,'hehe','master');
3、在2台从MySQL服务器上：
slave1：
mysql> stop slave;
mysql> insert into biao1 values(2,'hehe','slave1');
slave2：
mysql> stop slave;
mysql> insert into biao1 values(3,'hehe','slave2');
4、在客户端测试：
查询biao1：
mysql> select * from biao1;
+------+------+---------+
| id | name | address |
+------+------+---------+
| 1 | hehe | slave1 |
+------+------+---------+
1 row in set (0.00 sec)
mysql> select * from biao1;
+------+------+---------+
| id | name | address |
+------+------+---------+
| 3 | hehe | slave2 |
+------+------+---------+
1 row in set (0.00 sec)
mysql> select * from biao1;
+------+------+---------+
| id | name | address |
+------+------+---------+
| 2 | hehe | slave1 |
+------+------+---------+
1 row in set (0.00 sec)
mysql> select * from biao1;
+------+------+---------+
| id | name | address |
+------+------+---------+
| 3 | hehe | slave2 |
+------+------+---------+
1 row in set (0.01 sec)
查到记录，说明记录分别从两台从MySQL数据库读取
插入一条记录：
mysql> insert into biao1 values(4,'hehe','write_zhu');
Query OK, 1 row affected (0.01 sec)
mysql> select * from biao1;
+------+------+---------+
| id | name | address |
+------+------+---------+
| 3 | hehe | slave2 |
+------+------+---------+
1 row in set (0.01 sec)
mysql> select * from biao1;
+------+------+---------+
| id | name | address |
+------+------+---------+
| 2 | hehe | slave1 |
+------+------+---------+
1 row in set (0.01 sec)
没有查到记录，说明这条记录只写入主MySQL数据库中
错误代码2006解决方案
mysql> set global max_allowed_packet=1024*1024*16;