MySQL的使用中实现读写分离的教程

tar -zxvf mysql-proxy-0.8.3-linux-glibc2.3-x86-64bit.tar.gz
 mv mysql-proxy-0.8.3-linux-glibc2.3-x86-64bit /usr/local/mysql-proxy

master  192.168.216.133：3306
slave   192.168.216.132：3306

vim /usr/local/mysql-proxy/mysql-proxy.conf

[mysql-proxy]
 daemon=true            #以后台守护进程方式启动
 keepalive=true           #当进程故障后自动重启
 log-level=debug         #设置日志级别为debug，可以在调试完成后改成info
 log-file=/var/log/mysql-proxy.log           #设置日志文件路径
 basedir=/usr/local/mysql-proxy            #设置mysql-proxy的家目录
 proxy-address=192.168.216.132:4040     #指定mysql-proxy的监听地址
 proxy-backend-addresses=192.168.216.133:3306                   #设置后台主服务器
 proxy-read-only-backend-addresses=192.168.216.132:3306          #设置后台从服务器
 proxy-lua-script=/usr/local/mysql-proxy/share/doc/mysql-proxy/rw-splitting.lua   #设置读写分离脚本路径
 admin-address=192.168.216.132:4041    #设置mysql-proxy管理地址，需要家长admin插件
 admin-username=admin                 #设置登录管理地址用户
 admin-password=admin                  #设置管理用户密码
 admin-lua-script=/usr/local/mysql-proxy/share/doc/mysql-proxy/admin.lua   #设置管理后台lua脚本路径，改脚本默认没有要自动定义

/usr/local/mysql-proxy/bin/mysql-proxy --plugins=proxy --plugins=admin --defaults-file=mysql-proxy.conf
 --plugins=proxy    #指定proxy插件，该配置写入配置文件无法启动
 --plugins=admin    #指定admin插件
 --defaults-file=mysql-proxy.conf      #指定配置文件

mysql -uadmin -padmin -h192.168.216.132 -P4041

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

[mysqld]
 skip-character-set-client-handshake
 init-connect      = 'SET NAMES utf8'
 character_set_server  = utf8

tar -zxvf mysqlnd_ms-1.5.2.tgz
 cd mysqlnd_ms-1.5.2
 /usr/local/php/bin/phpize
 ./configure --with-php-config=/usr/local/php/bin/php-config
 make && make install

Installing shared extensions:   /usr/local/php/lib/php/extensions/no-debug-non-zts-20121212/
Installing header files:     /usr/local/php/include/php/</span>

extension = /usr/local/php/lib/php/extensions/no-debug-non-zts-20121212/mysqlnd_ms.so
 mysqlnd_ms.enable = On
 mysqlnd_ms.config_file = /usr/local/php/etc/mysqlnd_ms_plugin.ini

{
  "myapp": {
    "master": {
      "master_0": {
        "host": "192.168.6.135",
        "socket": "\/tmp\/mysql.sock"
      }
    "slave": {
      "slave_0": {
        "host": "192.168.6.136",
        "port": "3306"
      "slave_1": {
        "host": "192.168.6.137",
        "port": "3306"
      "filters": {
        "random": {
          "sticky": "1"
        }
      }
    }
}

/** MySQL主机 */
 define('DB_HOST', 'myapp'); #这的myapp是在mysqlnd_ms_plugin.ini中定义的