amoeba for mysql实现 mysql读写分离；
http://onlyoulinux.blog.51cto.com/7941460/1570472以上blog己经实现了mysql的主从，本文在主从的基础上用amoeba-mysql实现负载均衡，读写分离 .
amoeba：采用java NTO框架无阻塞模式；
amoeba for mysql是amoeba项目的子项目；
1、amoeba要有java环境支持：安装jdk
root@mysql-proxy src]# rpm -ivh jdk-7u67-linux-i586.rpm
Preparing... ###########################################
1:jdk ###########################################
Unpacking JAR files...
rt.jar...
jsse.jar...
charsets.jar...
tools.jar...
localedata.jar...
jfxrt.jar...
plugin.jar...
javaws.jar...
deploy.jar...
# cat /etc/profile.d/jdk.sh
export JAVA_HOME=/usr/java/jdk1.7.0_67
export PATH=$PATH:$JAVA_HOME/bin:$JAVA_HOME/jre
# source /etc/profile
2、下载amoeba包：
#mkdir /usr/local/amoeba
#cd /usr/local/amoeba/
#wget http://jaist.dl.sourceforge.net/project/amoeba/Amoeba%20for%20mysql/amoeba-mysql-1.3.1-BETA.zip
# unzip amoeba-mysql-1.3.1-BETA.zip
# ls
amoeba-mysql-1.3.1-BETA.zipbinbuild.propertiesbuild.xmlconfdoclib
LICENSE.txtlogsREADME.htmlsrc
3、以下是我的配置文件（标红的是 需要注意或改动的地方）
# cat conf/amoeba.xml|grep -v "^$"
8066
192.168.0.120
128
true
root
password
60
com.meidusa.amoeba.net.AuthingableConnectionManager
defaultManager
3306
192.168.0.117
test
proxy
proxy
200
200
10
600000
600000
true
true
defaultManager
3306
192.168.0.118
test
proxy
proxy
200
200
10
600000
600000
true
true
1
server1
1
server1,server2
${amoeba.home}/conf/rule.xml
${amoeba.home}/conf/functionMap.xml
${amoeba.home}/conf/ruleFunctionMap.xml
1500
master
master
slave
true
4、在主库上对amoeba代理进行授权（只授权主库就可以，从库会自动 同步的）
mysql>GRANT ALL PRIVILEGES ON *.* TO 'proxy'@'192.168.0.120'> row in set (0.00 sec)
mysql>flush privileges;
5、启动amoeba
# /usr/local/amoeba/bin/amoeba & 先要给amoeba加可执行权限
# ps -ef |grep amoeba
root 768616040 06:26 pts/1 00:00:22 /usr/java/jdk1.7.0_67/bin/java -server -Xms256m -Xmx256m -Xss128k -Damoeba.home=/usr/local/amoeba -Dclassworlds.conf=/usr/local/amoeba/bin/amoeba.classworlds -classpath /usr/local/amoeba/lib/classworlds-1.0.jar org.codehaus.classworlds.Launcher
root 797779490 07:25 tty1 00:00:00 vim /usr/local/amoeba/conf/amoeba.xml
root 800414560 07:38 pts/0 00:00:00 grep amoeba
# netstat -tunlp |grep java
tcp 0 0 ::ffff:192.168.0.120:8066 :::* LISTEN 7686/java
6、测试
测试方法：单独建一个test库，在库中建一个表jaychou，表中加一行数据，然后 mysql>slave stop;让数据不再同步，然后在主库中再加入一行数据；在amoeba上反复查询看不同；这是实现了读的测试，写的测试只要在amoeba上插入一行数据就可以了；
# mysql -uroot -ppassword -h192.168.0.120 -P8066 注意分清哪个用户名哪个密码；
mysql> select * from jaychou;
+------+
|> +------+
| 1 |
| 2 |
+------+
2 rows in set (0.00 sec)
mysql> select * from jaychou;
+------+
|> +------+
| 1 |
+------+
1 row in set (0.01 sec)
mysql> select * from jaychou;
+------+
|> +------+
| 1 |
| 2 |
+------+
2 rows in set (0.01 sec)
mysql> select * from jaychou;
+------+
|> +------+
| 1 |
+------+
1 row in set (0.00 sec)
mysql> insert into jaychou value(3);
Query OK, 1 row affected (0.01 sec)
mysql> select * from jaychou;
+------+
|> +------+
| 1 |
+------+
1 row in set (0.00 sec)
mysql> select * from jaychou;
+------+
|> +------+
| 1 |
| 2 |
| 3 |
+------+
3 rows in set (0.01 sec)
mysql>
貌似达到这个效果就可以了，
amoeba还可以做负载均衡，不过对于主从两个节点的mysql cluster来说，使用roundrobin机制就可以了 ；对于多节点的mysql集群来说可以用轮循、权重、甚至可以做HA
；
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