Mysql复制及代理

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Mysql复制的作用和原理

mysql-5.5实现主从复制

mysql-5.6主从复制和Mysql_Proxy的实现

mysql-5.6基于amoeba实现读写分离

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Mysql复制的作用和原理

复制的作用

• 辅助实现备份

• 高可用

• 异地容灾

• scale out:分摊负载

• MySQL路由：读写请求交由代理服务器，工作在应用层可以理解SQL语句，从而实现读写分离，再结合LVS、HAPROXY等均摊读的负载。

• 为了让主服务器不会因为从服务器太多产生多线程复制导致服务器压力过大，使用多级复制。

复制原理

复制流程如下：

• Master数据发生改变之后写入二进制日志并通过dump线程复制到Slave。

• Slave本地启用I/0线程负责接受Master端dump线程发来的日志并保存至本地中继日志中。

• Slave通过启用本地SQL线程将中继日志中那些复制而来的事件重放。
  

relaylog(中继日志)

• mysql日志传输默认是异步传输

• mysql支持一主多从

• mysql半同步意为只要其中一个从服务器返回确认就认为同步成功

• 可以使用mysql从服务器做冷备份，配合主服务器上的二进制日志做即时点还原

• mysql多级复制从服务器可以记录二进制日志，否则一般情况下不需要记录二进制日志

mysql-5.5实现主从复制

结构图如下：

安装mysql

mkdir -pv /mydata/data
useradd -r mysql
chown -R mysql.mysql /mydata/data
tar xf mysql-5.5.28-linux2.6-i686.tar.gz -C /usr/local
cd  /usr/local/
ln -sv mysql-5.5.28-linux2.6-i686 mysql
cd mysql
chown  -R root.mysql ./*
scripts/mysql_install_db --user=mysql --datadir=/mydata/data/
cp support-files/my-large.cnf  /etc/my.cnf
cp support-files/mysql.server /etc/rc.d/init.d/mysqld
chkconfig --add mysqld
vim /etc/profile.d/mysql.sh
export PATH=$PATH:/usr/local/mysql/bin
. /etc/profile.d/mysql.sh

Master配置

#####修改配置文件 vim /etc/my.cnf
datadir = /mydata/data
log-bin=master-bin
log-bin-index=master-bin.index
innodb_file_per_table = 1
binlog_format=mixed
server-id       = 1
sync_binlog = 1
innodb_flush_logs_at_trx_commit = 1
#####开启Slave权限用户
mysql> GRANT REPLICATION SLAVE ON *.* TO 'repluser'@'192.168.1.%' IDENTIFIED BY 'replpass';
Query OK, 0 rows affected (0.00 sec)
mysql> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.00 sec)

Slave配置

#####修改配置文件vim /etc/my.cnf
datadir = /mydata/data
relay-log = relay-log
relay-log-index = relay-log.index
read-only = ON
server-id       = 11
skip_slave_start = 1
read_only = 1
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
#####查看主日志文件和事件位置
mysql> show master status;
+-------------------+----------+--------------+------------------+
| File              | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+-------------------+----------+--------------+------------------+
| master-bin.000001 |      340 |              |                  |
+-------------------+----------+--------------+------------------+
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
#####开启slave复制功能
mysql> CHANGE MASTER TO MASTER_HOST='192.168.1.131',MASTER_USER='repluser', MASTER_PASSWORD='replpass',MASTER_LOG_FILE='master-bin.000001',MASTER_LOG_POS=340;
#####查看slave状态，可得出master二进制日志和slave中继日志的事件和位置对应未必同意所以在slave备份的时候应该记录主服务器的二进制日志，只有二进制日志才可以完成即使点还原
Slave_IO_Running: No
Slave_SQL_Running: No      均为yes代表slave复制正常
#####查看复制状态
mysql> show slave status\G
*************************** 1. row ***************************
               Slave_IO_State:
                  Master_Host: 192.168.1.131
                  Master_User: repluser
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: master-bin.000001
          Read_Master_Log_Pos: 340
               Relay_Log_File: relay-log.000001
                Relay_Log_Pos: 4
        Relay_Master_Log_File: master-bin.000001
             Slave_IO_Running: No
            Slave_SQL_Running: No
    Replicate_Do_DB:
          Replicate_Ignore_DB:
           Replicate_Do_Table:
       Replicate_Ignore_Table:
      Replicate_Wild_Do_Table:
  Replicate_Wild_Ignore_Table:
                   Last_Errno: 0
                   Last_Error:
                 Skip_Counter: 0
          Exec_Master_Log_Pos: 340   #重放到的位置
              Relay_Log_Space: 107
              Until_Condition: None
               Until_Log_File:
                Until_Log_Pos: 0
           Master_SSL_Allowed: No
           Master_SSL_CA_File:
           Master_SSL_CA_Path:
              Master_SSL_Cert:
            Master_SSL_Cipher:
               Master_SSL_Key:
        Seconds_Behind_Master: NULL
Master_SSL_Verify_Server_Cert: No
                Last_IO_Errno: 0
                Last_IO_Error:
               Last_SQL_Errno: 0
               Last_SQL_Error:
  Replicate_Ignore_Server_Ids:
             Master_Server_Id: 0
#####开启复制进程
mysql> START SLAVE;

测试

#####Master
mysql> create database soulboy;
Query OK, 1 row affected (0.00 sec)
#####Slave
mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| soulboy            |
| test               |
+--------------------+
5 rows in set (0.00 sec)

mysql-5.6主从复制和Mysql_Proxy的实现

复制功能的改进

• 支持多线程复制，事实上是针对每个database开启相应的独立线程。即每个库有一个单独的(sql thread)如果线上业务中，只有一个database或者绝大多数压力集中在个别database的话，多线程并发复制特性就没有意义了。

• 支持启用GTID，对运维人员来说应该是一件令人高兴的事情，在配置主从复制，传统的方式里，你需要找到binlog和POS点，然后change master to指向，而不是很有经验的运维，往往会将其找错，造成主从同步复制报错，在mysql5.6里，无须再知道binlog和POS点，需要知道master的IP、端口，账号密码即可，因为同步复制是自动的，mysql通过内部机制GTID自动找点同步。

结构图如下：

Mysql-5.6主从复制功能的实现步骤

Master配置（安装步骤省略）

#####主节点配置文件  /etc/my.cnf
[mysqld]
binlog-format=ROW
log-bin=master-bin
log-slave-updates=true
gtid-mode=on
enforce-gtid-consistency=true
master-info-repository=TABLE
relay-log-info-repository=TABLE
sync-master-info=1
slave-parallel-workers=2
binlog-checksum=CRC32
master-verify-checksum=1
slave-sql-verify-checksum=1
binlog-rows-query-log_events=1
server-id=1
report-port=3306
port=3306
datadir=/mydata/data
socket=/tmp/mysql.sock
report-host=192.168.1.201
#####配置完成重启mysql服务，确保gitd_mode为打开状态
mysql> SHOW GLOBAL VARIABLES LIKE '%gtid%';
+--------------------------+-------+
| Variable_name            | Value |
+--------------------------+-------+
| enforce_gtid_consistency | ON    |
| gtid_executed            |       |
| gtid_mode                | ON    |
| gtid_owned               |       |
| gtid_purged              |       |
+--------------------------+-------+
#####Slave用户授权
mysql> GRANT REPLICATION SLAVE ON *.* TO 'repluser'@'192.168.1.%' IDENTIFIED BY 'replpass';
Query OK, 0 rows affected (0.00 sec)
mysql> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.00 sec)

Slave节点配置（安装步骤省略）

#####Mysql主配置文件 /etc/my.cnf
[mysqld]
binlog-format=ROW
log-slave-updates=true
gtid-mode=on
enforce-gtid-consistency=true
master-info-repository=TABLE
relay-log-info-repository=TABLE
sync-master-info=1
slave-parallel-workers=2
binlog-checksum=CRC32
master-verify-checksum=1
slave-sql-verify-checksum=1
binlog-rows-query-log_events=1
server-id=11
report-port=3306
port=3306
log-bin = mysql-bin.log
datadir=/mydata/data
socket=/tmp/mysql.sock
report-host=192.168.1.202
#####Slave连接Master服务器
mysql> CHANGE MASTER TO MASTER_HOST='192.168.1.201',MASTER_USER='repluser',MASTER_PASSWORD='replpass',MASTER_AUTO_POSITION=1;
Query OK, 0 rows affected, 2 warnings (0.01 sec)
#####启动两个线程Slave_IO_Running和Slave_SQL_Running
mysql> start slave;
Query OK, 0 rows affected, 1 warning (0.01 sec)

测试主从复制成功

#####Master
mysql> create database soulboy;
Query OK, 1 row affected (0.00 sec)
#####Slave
mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| soulboy            |
| test               |
+--------------------+
5 rows in set (0.01 sec)

Mysql-Proxy的实现

安装mysql-proxy

useradd -r mysql-proxy
tar xf mysql-proxy-0.8.3-linux-glibc2.3-x86-64bit.tar.gz  -C /usr/local/
cd /usr/local/
ln -sv mysql-proxy-0.8.3-linux-glibc2.3-x86-64bit mysql-pro
cd mysql-proxy
vi /etc/profile.d/mysql-proxy.sh
export PATH=$PATH:/usr/local/mysql-proxy/bin
. /etc/profile.d/mysql-proxy.sh

主服务器创建远程用户

mysql> GRANT ALL ON *.* TO 'root'@'192.168.%.%' IDENTIFIED BY 'redhat';
Query OK, 0 rows affected (0.00 sec)
mysql> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.00 sec)

为mysql-proxy提供SysV服务脚本

#!/bin/bash
#
# mysql-proxy This script starts and stops the mysql-proxy daemon
#
# chkconfig: - 78 30
# processname: mysql-proxy
# description: mysql-proxy is a proxy daemon for mysql
# Source function library.
. /etc/rc.d/init.d/functions
prog="/usr/local/mysql-proxy/bin/mysql-proxy"
# Source networking configuration.
if [ -f /etc/sysconfig/network ]; then
    . /etc/sysconfig/network
fi
# Check that networking is up.
[ ${NETWORKING} = "no" ] && exit 0
# Set default mysql-proxy configuration.
ADMIN_USER="admin"
ADMIN_PASSWD="admin"
ADMIN_LUA_SCRIPT="/usr/local/mysql-proxy/share/doc/mysql-proxy/admin.lua"
PROXY_OPTIONS="--daemon"
PROXY_PID=/var/run/mysql-proxy.pid
PROXY_USER="mysql-proxy"
# Source mysql-proxy configuration.
if [ -f /etc/sysconfig/mysql-proxy ]; then
    . /etc/sysconfig/mysql-proxy
fi
RETVAL=0
start() {
    echo -n $"Starting $prog: "
    daemon $prog $PROXY_OPTIONS --pid-file=$PROXY_PID --proxy-address="$PROXY_ADDRESS" --user=$PROXY_USER --admin-username="$ADMIN_USER" --admin-lua-script="$ADMIN_LUA_SCRIPT" --admin-password="$ADMIN_PASSWORD"
    RETVAL=$?
    echo
    if [ $RETVAL -eq 0 ]; then
        touch /var/lock/subsys/mysql-proxy
    fi
}
stop() {
    echo -n $"Stopping $prog: "
    killproc -p $PROXY_PID -d 3 $prog
    RETVAL=$?
    echo
    if [ $RETVAL -eq 0 ]; then
        rm -f /var/lock/subsys/mysql-proxy
        rm -f $PROXY_PID
    fi
}
# See how we were called.
case "$1" in
    start)
        start
        ;;
    stop)
        stop
        ;;
    restart)
        stop
        start
        ;;
    condrestart|try-restart)
        if status -p $PROXY_PIDFILE $prog >&/dev/null; then
            stop
            start
        fi
        ;;
    status)
        status -p $PROXY_PID $prog
        ;;
    *)
        echo "Usage: $0 {start|stop|restart|reload|status|condrestart|try-restart}"
        RETVAL=1
        ;;
esac
exit $RETVAL
#####将上述内容保存为/etc/rc.d/init.d/mysql-proxy，给予执行权限，而后加入到服务列表。
# chmod +x /etc/rc.d/init.d/mysql-proxy
# chkconfig --add mysql-proxy

Mysql-Proxy的远程管理依赖于lua脚本

#####vi /usr/local/mysql-proxy/share/doc/mysql-proxy/admin.lua
vi /usr/local/mysql-proxy/share/doc/mysql-proxy/admin.lua
function set_error(errmsg)
    proxy.response = {
        type = proxy.MYSQLD_PACKET_ERR,
        errmsg = errmsg or "error"
    }
end
function read_query(packet)
    if packet:byte() ~= proxy.COM_QUERY then
        set_error("[admin] we only handle text-based queries (COM_QUERY)")
        return proxy.PROXY_SEND_RESULT
    end
    local query = packet:sub(2)
    local rows = { }
    local fields = { }
    if query:lower() == "select * from backends" then
        fields = {
            { name = "backend_ndx",
              type = proxy.MYSQL_TYPE_LONG },
            { name = "address",
              type = proxy.MYSQL_TYPE_STRING },
            { name = "state",
              type = proxy.MYSQL_TYPE_STRING },
            { name = "type",
              type = proxy.MYSQL_TYPE_STRING },
            { name = "uuid",
              type = proxy.MYSQL_TYPE_STRING },
            { name = "connected_clients",
              type = proxy.MYSQL_TYPE_LONG },
        }
        for i = 1, #proxy.global.backends do
            local states = {
                "unknown",
                "up",
                "down"
            }
            local types = {
                "unknown",
                "rw",
                "ro"
            }
            local b = proxy.global.backends[i]
            rows[#rows + 1] = {
                i,
                b.dst.name,          -- configured backend address
                states[b.state + 1], -- the C-id is pushed down starting at 0
                types[b.type + 1],   -- the C-id is pushed down starting at 0
                b.uuid,              -- the MySQL Server's UUID if it is managed
                b.connected_clients  -- currently connected clients
            }
        end
    elseif query:lower() == "select * from help" then
        fields = {
            { name = "command",
              type = proxy.MYSQL_TYPE_STRING },
            { name = "description",
              type = proxy.MYSQL_TYPE_STRING },
        }
        rows[#rows + 1] = { "SELECT * FROM help", "shows this help" }
        rows[#rows + 1] = { "SELECT * FROM backends", "lists the backends and their state" }
    else
        set_error("use 'SELECT * FROM help' to see the supported commands")
        return proxy.PROXY_SEND_RESULT
    end
    proxy.response = {
        type = proxy.MYSQLD_PACKET_OK,
        resultset = {
            fields = fields,
            rows = rows
        }
    }
    return proxy.PROXY_SEND_RESULT
end

为服务脚本提供配置文件

#####vim /etc/sysconfig/mysql-proxy
# Options for mysql-proxy
ADMIN_USER="admin"
ADMIN_PASSWORD="admin"
ADMIN_ADDRESS=""
ADMIN_LUA_SCRIPT="/usr/local/mysql-proxy/share/doc/mysql-proxy/admin.lua"
PROXY_ADDRESS="0.0.0.0:3306"
PROXY_USER="mysql-proxy"
PROXY_OPTIONS="--daemon --log-level=info --log-file="/var/log/mysql-proxy.log" --plugins=proxy --plugins=admin --proxy-backend-addresses=192.168.1.201:3306 --proxy-read-only-backend-addresses=192.168.1.202:3306 --proxy-lua-script=/usr/local/mysql-proxy/share/doc/mysql-proxy/rw-splitting.lua"

mysql-proxy的配置选项

mysql-proxy的配置选项大致可分为帮助选项、管理选项、代理选项及应用程序选项几类，下面一起去介绍它们。
--help
--help-admin
--help-proxy
--help-all ———— 以上四个选项均用于获取帮助信息；
--proxy-address=host:port ———— 代理服务监听的地址和端口；
--admin-address=host:port ———— 管理模块监听的地址和端口；
--proxy-backend-addresses=host:port ———— 后端mysql服务器的地址和端口；
--proxy-read-only-backend-addresses=host:port ———— 后端只读mysql服务器的地址和端口；
--proxy-lua-script=file_name ———— 完成mysql代理功能的Lua脚本；
--daemon ———— 以守护进程模式启动mysql-proxy；
--keepalive ———— 在mysql-proxy崩溃时尝试重启之；
--log-file=/path/to/log_file_name ———— 日志文件名称；
--log-level=level ———— 日志级别；
--log-use-syslog ———— 基于syslog记录日志；
--plugins=plugin,.. ———— 在mysql-proxy启动时加载的插件；
--user=user_name ———— 运行mysql-proxy进程的用户；
--defaults-file=/path/to/conf_file_name ———— 默认使用的配置文件路径；其配置段使用[mysql-proxy]标识；
--proxy-skip-profiling ———— 禁用profile；
--pid-file=/path/to/pid_file_name ———— 进程文件名；

启动服务并查看端口

#####重启服务
[root@localhost ~]# service mysql-proxy restart
Stopping /usr/local/mysql-proxy/bin/mysql-proxy:           [  OK  ]
Starting /usr/local/mysql-proxy/bin/mysql-proxy:           [  OK  ]
#####查看端口，3306为服务端口，4041为管理端口
[root@localhost ~]# netstat -tnlp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name
tcp        0      0 0.0.0.0:22                  0.0.0.0:*                   LISTEN      1120/sshd      
tcp        0      0 127.0.0.1:25                0.0.0.0:*                   LISTEN      1196/master    
tcp        0      0 0.0.0.0:4041                0.0.0.0:*                   LISTEN      2144/mysql-proxy
tcp        0      0 0.0.0.0:3306                0.0.0.0:*                   LISTEN      2144/mysql-proxy
tcp        0      0 :::22                       :::*                        LISTEN      1120/sshd      
tcp        0      0 ::1:25                      :::*                        LISTEN      1196/master

管理功能测试（unkown表示后端服务器状况未知）

[root@node2 ~]# mysql -uadmin -h192.168.1.208 --port=4041 -p
Enter password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.0.99-agent-admin
Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> SELECT * FROM backends;
+-------------+--------------------+---------+------+------+-------------------+
| backend_ndx | address            | state   | type | uuid | connected_clients |
+-------------+--------------------+---------+------+------+-------------------+
|           1 | 192.168.1.201:3306 | unknown | rw   | NULL |                 0 |
|           2 | 192.168.1.202:3306 | unknown | ro   | NULL |                 0 |
+-------------+--------------------+---------+------+------+-------------------+
2 rows in set (0.00 sec)

读写分离测试

使用mysql客户端连接mysql-proxy创建数据库

[root@node2 ~]# mysql -uroot -p -h192.168.1.208 -e 'create database mydb;'
Enter password:

再次查看Mysql_Proxy管理控制台发现master变为up，表征写请求分配到master

mysql> SELECT * FROM backends;
+-------------+--------------------+---------+------+------+-------------------+
| backend_ndx | address            | state   | type | uuid | connected_clients |
+-------------+--------------------+---------+------+------+-------------------+
|           1 | 192.168.1.201:3306 | up      | rw   | NULL |                 0 |
|           2 | 192.168.1.202:3306 | unknown | ro   | NULL |                 0 |
+-------------+--------------------+---------+------+------+-------------------+
2 rows in set (0.00 sec)

使用mysql客户端连接mysql-proxy查询操作

[root@node2 ~]#  mysql -uroot -p -h192.168.1.208 -e 'show databases;'
Enter password:
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mydb               |
| mysql              |
| performance_schema |
| soulboy            |
| test               |
+--------------------+

再次查看Mysql_Proxy管理控制台发现slave也变为了up,表征读请求分配到了slave

mysql> SELECT * FROM backends;
+-------------+--------------------+-------+------+------+-------------------+
| backend_ndx | address            | state | type | uuid | connected_clients |
+-------------+--------------------+-------+------+------+-------------------+
|           1 | 192.168.1.201:3306 | up    | rw   | NULL |                 0 |
|           2 | 192.168.1.202:3306 | up    | ro   | NULL |                 0 |
+-------------+--------------------+-------+------+------+-------------------+
2 rows in set (0.00 sec)

至此Mysql_Proxy成功实现读写分离

mysql-5.6基于amoeba实现读写分离

• Amoeba(变形虫)项目,该开源框架于2008年 开始发布一款 Amoeba for Mysql软件。这个软件致力于MySQL的分布式数据库前端代理层，它主要在应用层访问MySQL的 时候充当SQL路由功能，专注于分布式数据库代理层（Database Proxy）开发。座落与 Client、DB Server(s)之间,对客户端透明。具有负载均衡、高可用性、SQL 过滤、读写分离、可路由相关的到目标数据库、可并发请求多台数据库合并结果。 通过Amoeba你能够完成多数据源的高可用、负载均衡、数据切片的功能，目前Amoeba已在很多 企业的生产线上面使用，除以之外变形虫具有以下优点：

• 降低费用：分布式数据库在地理上可以式分布的。其系统的结构符合这种分布的要求。允许用 户在自己的本地录用、查询、维护等操作，实行局部控制，降低通信代价，避免集中式需要更高要求 的硬件设备。而且分布式数据库在单台机器上面数据量较少，其响应速度明显提升。

• 提高系统整体可用性：避免了因为单台数据库的故障而造成全部瘫痪的后果。

• 易于扩展处理能力和系统规模：分布式数据库系统的结构可以很容易地扩展系统，在分布式数 据库中增加一个新的节点，不影响现有系统的正常运行。这种方式比扩大集中式系统要灵活经济。在 集中式系统中扩大系统和系统升级，由于有硬件不兼容和软件改变困难等缺点，升级的代价常常是昂贵和不可行的。

安装JDK，由于Amoeba是java程序所研发，所以需要先安装JDK程序 jdk-6u31-linux-x64-rpm

chmod +x jdk-6u31-linux-x64-rpm.bin
./jdk-6u31-linux-x64-rpm.bin
 vim /etc/profile.d/java.sh
export JAVA_HOME=/usr/java/latest
export PATH=$JAVA_HOME/bin:$PATH
. /etc/profile.d/java.sh
[root@amoeba ~]# java -version
java version "1.6.0_31"
Java(TM) SE Runtime Environment (build 1.6.0_31-b04)
Java HotSpot(TM) 64-Bit Server VM (build 20.6-b01, mixed mode)

安装Amoeba amoeba-mysql-binary-2.2.0.tar

mkdir /usr/local/amoeba
tar xf amoeba-mysql-binary-2.2.0.tar.gz -C /usr/local/amoeba/
vim /etc/profile.d/amoeba.sh
export AMOEBA_HOME=/usr/local/amoeba
export PATH=$AMOEBA_HOME/bin:$PATH
/etc/profile.d/amoeba.sh
[root@amoeba ~]# amoeba
amoeba start|stop

分别在Master和Slave上执行创建远程授权用户amoeba，使用之前的root也可以，这里特意为了区别

mysql> GRANT ALL ON *.* TO 'amoeba'@'192.168.1.%' INDENTIFIED BY 'redhat';
mysql> flush privileges;

配置vim /usr/local/amoeba/conf/dbServers.xml 定义连接后端Mysql服务器信息

        
    
        
            ${defaultManager}
            64
            128
            
            3306       #主从mysql端口
            
            test     #默认是的库
            
            amoeba     #远程授权用户
                                #远程授权密码
            redhat
        
        
            500
            500
            10
            600000
            600000
            true
            true
            true
        
    
            #主节点
        
            
            192.168.1.201
        
    
             #从节点
        
            
            192.168.1.202
        
    
    
        
            
            1        #算法
            
            slave      #定义数据池
        
    

配置 vim /usr/local/amoeba/conf/amoeba.xml #定义数据库读写分离及节点管理信息等

    
        
        
            
            3306     #amoeba监听端口
            
            
            ${clientConnectioneManager}
            
                
                    128
                    64
                
            
            
                
                    admin         #mysql客户端连接amoeba使用的账户
                    password  #mysql客户端连接amoeba使用的密码
                    
                        
                            ${amoeba.home}/conf/access_list.conf
                        
                    
                
            
        
        
        
            
            
            
            127.0.0.1
            true
            ${clientConnectioneManager}
            
                
            
        
        
            
            20
            
            30
            
            30
            
            500
            
            60
        
    
    
    
        
            com.meidusa.amoeba.net.ConnectionManager
            
        
        
            com.meidusa.amoeba.net.AuthingableConnectionManager
            
        
    
        
    
        ${amoeba.home}/conf/dbServers.xml
    
    
        
            
                ${amoeba.home}/conf/rule.xml
                ${amoeba.home}/conf/ruleFunctionMap.xml
            
        
        ${amoeba.home}/conf/functionMap.xml
        1500
        master   #默认池
        master     #写库
        slave       #读库
        true
    

启动amoeba服务

amoeba start &
netstat  -tnlp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name
tcp        0      0 0.0.0.0:22                  0.0.0.0:*                   LISTEN      1120/sshd        
tcp        0      0 127.0.0.1:25                0.0.0.0:*                   LISTEN      1196/master      
tcp        0      0 :::22                       :::*                        LISTEN      1120/sshd        
tcp        0      0 ::1:25                      :::*                        LISTEN      1196/master      
tcp        0      0 ::ffff:127.0.0.1:41575      :::*                        LISTEN      3097/java        
tcp        0      0 :::3306                     :::*                        LISTEN      3097/java

使用客户端连接amoeba

Master抓包

Slave抓包

至此变形虫成功实现读写分离