读写分离

1. 功能介绍
   读写分离
   从库负载均衡
   IP过滤
   SQL语句黑白名单
   DBA可平滑上下线DB
   自动摘除宕机的DB
   自动分表

下载地址
https://github.com/Qihoo360/Atlas/releases
注意：
1、Atlas只能安装运行在64位的系统上
2、Centos 5.X安装 Atlas-XX.el5.x86_64.rpm，Centos 6.X安装Atlas-XX.el6.x86_64.rpm。
3、后端mysql版本应大于5.1，建议使用Mysql 5.6以上

2.安装配置
yum install -y Atlas*
cd /usr/local/mysql-proxy/conf
mv test.cnf test.cnf.bak
vi test.cnf
[mysql-proxy]
admin-username = user
admin-password = pwd
proxy-backend-addresses = 10.0.0.55:3306
proxy-read-only-backend-addresses = 10.0.0.51:3306,10.0.0.53:3306
pwds = repl:3yb5jEku5h4=,mha:O2jBXONX098=
daemon = true
keepalive = true
event-threads = 8
log-level = message
log-path = /usr/local/mysql-proxy/log
sql-log=ON
proxy-address = 0.0.0.0:33060
admin-address = 0.0.0.0:2345
charset=utf8
启动atlas
/usr/local/mysql-proxy/bin/mysql-proxyd test start
ps -ef |grep proxy

3. Atlas功能测试
   测试读操作：
   mysql -umha -pmha -h 10.0.0.53 -P 33060
   db03 [(none)]>select @@server_id;
   测试写操作：
   mysql> begin;select @@server_id;commit;

4. 生产用户要求
   开发人员申请一个应用用户 app( select update insert) 密码123456,要通过10网段登录

5. 在主库中,创建用户
   grant select ,update,insert on . to app@'10.0.0.%' identified by '123456';

6. 在atlas中添加生产用户
   /usr/local/mysql-proxy/bin/encrypt 123456 ---->制作加密密码
   vim test.cnf
   pwds = repl:3yb5jEku5h4=,mha:O2jBXONX098=,app:/iZxz+0GRoA=
   /usr/local/mysql-proxy/bin/mysql-proxyd test restart
   [root@db03 conf]# mysql -uapp -p123456 -h 10.0.0.53 -P 33060

7. Atlas基本管理
   连接管理接口：
   mysql -uuser -ppwd -h127.0.0.1 -P2345

打印帮助：
mysql> select * from help;

查询后端所有节点信息：
mysql> SELECT * FROM backends ;
+-------------+----------------+-------+------+
| backend_ndx | address | state | type |
+-------------+----------------+-------+------+
| 1 | 10.0.0.55:3306 | up | rw |
| 2 | 10.0.0.51:3306 | up | ro |
| 3 | 10.0.0.53:3306 | up | ro |
+-------------+----------------+-------+------+
3 rows in set (0.00 sec)

动态添加删除节点：
REMOVE BACKEND 3;

动态添加节点：
ADD SLAVE 10.0.0.53:3306;

保存配置到配置文件
SAVE CONFIG;