实验环境：
MySQL amoeba：192.168.200.116
MySQL-master:192.168.200.111
MySQL-slave1:192.168.200.112
MySQL-slave2:192.168.200.113
MySQL client:192.168.200.100
先实现MySQL数据库的主从复制，方法见上一篇。
1.安装Amoeba上安装java环境（推荐jdk1.5或1.6）
[root@localhost ~]# ls
amoeba-mysql-binary-2.2.0.tar.gz initial-setup-ks.cfg nohup.out
anaconda-ks.cfg jdk-6u14-linux-x64.bin yum.sh
[root@localhost ~]# chmod +x jdk-6u14-linux-x64.bin
[root@localhost ~]# jdk-6u14-linux-x64.bin
一路空格，输入yes，回车完成
[root@localhost ~]# mv jdk1.6.0_14/ /usr/local/jdk1.6
[root@localhost ~]# vim /etc/profile
末行添加
export JAVA_HOME=/usr/local/jdk1.6
export CLASSPATH=$CLASSPATH:$JAVA_HOME/lib:$JAVA_HOME/jre/lib
export PATH=$PATH:$JAVA_HOME/bin:$JAVA_HOME/jre/bin
export AMOEBA_HOME=/usr/local/amoeba/
export PATH=$PATH:$AMOEBA_HOME/bin
[root@localhost ~]# source /etc/profile
[root@localhost ~]# java -version
openjdk version "1.8.0_131"
OpenJDK Runtime Environment (build 1.8.0_131-b12)
OpenJDK 64-Bit Server VM (build 25.131-b12, mixed mode)
[root@localhost ~]# rm -rf /usr/bin/java
[root@localhost ~]# source /etc/profile
[root@localhost ~]# java -version
java version "1.6.0_14"
Java(TM) SE Runtime Environment (build 1.6.0_14-b08)
Java HotSpot(TM) 64-Bit Server VM (build 14.0-b16, mixed mode)
备注：自带高版本java问题
[root@localhost ~]# java -version
openjdk version "1.8.0_161"
OpenJDK Runtime Environment (build 1.8.0_161-b14)
OpenJDK 64-Bit Server VM (build 25.161-b14, mixed mode)
方法一：卸载高版本
[root@localhost ~]# rpm -qa | grep -i openjdk
java-1.7.0-openjdk-1.7.0.171-2.6.13.2.el7.x86_64
java-1.7.0-openjdk-headless-1.7.0.171-2.6.13.2.el7.x86_64
java-1.8.0-openjdk-1.8.0.161-2.b14.el7.x86_64
java-1.8.0-openjdk-headless-1.8.0.161-2.b14.el7.x86_64
[root@localhost ~]# rpm -e java-1.7.0-openjdk-headless java-1.7.0-openjdk java-1.8.0-openjdk-headless java-1.8.0-openjdk –nodeps
方法二：删除高版本java程序文件
[root@localhost ~]# which java
/usr/bin/java
[root@localhost ~]# /usr/bin/java -version
openjdk version "1.8.0_161"
OpenJDK Runtime Environment (build 1.8.0_161-b14)
OpenJDK 64-Bit Server VM (build 25.161-b14, mixed mode)
[root@localhost ~]#
[root@localhost ~]# rm -rf /usr/bin/java
[root@localhost ~]# source /etc/profile
2.安装配置Amoeba
[root@localhost ~]# mkdir /usr/local/amoeba
[root@localhost ~]# tar xf amoeba-mysql-binary-2.2.0.tar.gz -C /usr/local/amoeba/
[root@localhost ~]# chmod -R 755 /usr/local/amoeba/
[root@localhost ~]# /usr/local/amoeba/bin/amoeba
amoeba start|stop //出现此行，证明配置无误
3.配置amoeba实现mysql-slave1，slave2读负载均衡
在三台MySQL服务器上对amoeba授权
MariaDB [(none)]> grant all on *.* to 'admin'@'192.168.200.%' identified by '123456';
Query OK, 0 rows affected (0.00 sec)
MariaDB [(none)]> flush privileges;
Query OK, 0 rows affected (0.00 sec)
编写amoeba.xml配置文件，设置读写分离
[root@localhost ~]# cd /usr/local/amoeba/conf/
[root@localhost conf]# cp amoeba.xml amoeba.xml.bak
[root@localhost conf]# vim amoeba.xml
11<property name="port">8066</property> //默认端口8066，无需修改
30<property name="user">amoeba</property> //设置一个用户，后面客户端访问时使用
32<property name="password">123456</property> //设置登录密码
115<property name="defaultPool">master</property> //默认的服务器池
117<property name="writePool">master</property> //写的服务器池
118<property name="readPool">slaves</property> //读服务器池
编辑dbServers.xml配置文件，设置登录MySQL服务器的用户及密码，MySQL服务器节点的IP地址，负载均衡算法
[root@localhost conf]# cp dbServers.xml dbServers.xml.bak
[root@localhost conf]# vim dbServers.xml
20<property name="port">3306</property> //设置MySQL连接端口，默认3306
26<property name="user">admin</property> //设置访问MySQL服务器所用的用户名
27<property name="password">123456</property> //设置访问MySQL服务器所用的密码
43<dbServer name="master" parent="abstractServer"> //设置MySQL服务器及IP地址
46<property name="ipAddress">192.168.200.111</property>
50<dbServer name="slave1" parent="abstractServer">
53<property name="ipAddress">192.168.200.112</property>
56<dbServer name="slave2" parent="abstractServer">
59<property name="ipAddress">192.168.200.113</property>
63<dbServer name="slaves" virtual="true"> //在amoeba.xml文件中设置的readPool
69<property name="poolNames">slave1,slave2</property> //前面定义的服务器节点名
[root@localhost conf]# nohup /usr/local/amoeba/bin/amoeba start &
[root@localhost ~]# vim /usr/local/amoeba/conf/dbServers.xml
[root@localhost ~]# netstat -anpt | grep java // 查看是否有8066端口
创建测试库，测试表
MariaDB [(none)]> use crushlinux;
Database changed
MariaDB [crushlinux]> insert into test values(2,'slave1');
Query OK, 1 row affected (0.01 sec)
可以在slave1和slave2上查看到该表
MariaDB [(none)]> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| crushlinux |
| db_test |
| mysql |
| performance_schema |
| test |
+--------------------+
6 rows in set (0.01 sec)
在slave1，slave2服务器上停止主从备份，并各自添加内容
MariaDB [crushlinux]> insert into test values(2,'slave1');
Query OK, 1 row affected (0.01 sec)
MariaDB [crushlinux]> insert into test values(3,'slave2');
Query OK, 1 row affected (0.01 sec)
在Client客户机测试
[root@client ~]# yum -y install mairadb-devel mariadb
2和3轮询出现
MySQL [(none)]> select * from crushlinux.test;
+------+--------+
| id | name |
+------+--------+
| 3 | slave2 |
+------+--------+
1 row in set (0.02 sec)
MySQL [(none)]> select * from crushlinux.test;
+------+--------+
| id | name |
+------+--------+
| 2 | slave1 |
+------+--------+
1 row in set (0.02 sec)
MySQL [(none)]> insert into crushlinux.test values(4,'client');
Query OK, 1 row affected (0.01 sec)
写入数据后无法查到，实现读写分离
MySQL [(none)]> select * from crushlinux.test;
+------+--------+
| id | name |
+------+--------+
| 2 | slave1 |
+------+--------+
1 row in set (0.01 sec)
MySQL [(none)]> select * from crushlinux.test;
+------+--------+
| id | name |
+------+--------+
| 3 | slave2 |
+------+--------+
1 row in set (0.02 sec)
开启主从复制后，可以查到写入的内容
MySQL [(none)]> select * from crushlinux.test;
+------+--------+
| id | name |
+------+--------+
| 3 | slave2 |
| 1 | master |
| 4 | client |
+------+--------+
3 rows in set (0.01 sec)
MySQL [(none)]> select * from crushlinux.test;
+------+--------+
| id | name |
+------+--------+
| 2 | slave1 |
| 1 | master |
| 4 | client |
+------+--------+
3 rows in set (0.02 sec)