MySQL 5.6.13基于MySQL-Proxy的读写分离
一、MySQL-Proxy简介
MySQL-Proxy是处在MySQL数据库客户和服务端之间的一个中间件，支持嵌入性脚本语言lua，可以用来分析，监控和变换通信数据，支持使用的场景包括：负载均衡和故障转移处理，查询分析日志，查询重写等。
MySQL Proxy更强大的一项功能是实现“读写分离（Read/Write Splitting）”。基本的原理是让主数据库处理事务性查询，而从数据库处理SELECT查询。数据库复制被用来把事务性查询导致的变更同步到集群中的从数据库。
二、实验环境
192.168.30.115 OS：CentOS 6.4 x86_64 mysql-proxy.luojianlong.com
192.168.30.116 OS：CentOS 6.4 x86_64 master.luojianlong.com
192.168.30.117 OS：CentOS 6.4 x86_64 slave.luojianlong.com
MySQL version：mysql-5.6.13-linux-glibc2.5-x86_64
MySQL-Proxy version：mysql-proxy-0.8.2-1.el6.x86_64
拓扑图：
由于，读写分离的是基于主从复制的，上一篇博客已经介绍了mysql 5.6的主从复制，所有这里就不介绍了，直接使用做好的主从架构。
首先，在mysql-proxy.luojianlong.com上面安装mysql-proxy，使用epel的yum源来安装
[root@mysql-proxy ~]# cat /etc/yum.repos.d/epel.repo [epel] name=Extra Packages for Enterprise Linux 6 - $basearch baseurl=http://mirrors.sohu.com/fedora-epel/6/x86_64/ enabled=1 gpgcheck=0 [root@mysql-proxy ~]# yum -y install mysql-proxy
修改服务脚本配置文件/etc/sysconfig/mysql-proxy
# 修改为 # Options for mysql-proxy ADMIN_USER="admin" ADMIN_PASSWORD="admin" ADMIN_LUA_SCRIPT="/usr/lib64/mysql-proxy/lua/admin.lua" PROXY_USER="mysql-proxy" PROXY_OPTIONS="--daemon --log-level=info --log-use-syslog --plugins=proxy --plugins=admin --proxy-backend-addresses=192.168.30.116:3306 --proxy-read-only-backend-addresses=192.168.30.117:3306 --proxy-lua-script=/usr/lib64/mysql-proxy/lua/rw-splitting.lua"
其中的proxy-backend-addresses选项和proxy-read-only-backend-addresses选项均可重复使用多次，以实现指定多个读写服务器或只读服务器。
mysql-proxy的配置选项：
--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；
这里使用mysql-proxy-0.8.3提供的读写分离的lua脚本，将其复制保存为/usr/lib64/mysql-proxy/lua/proxy/rw-splitting.lua，就可以启动服务了
[root@mysql-proxy ~]# vi /usr/lib64/mysql-proxy/lua/rw-splitting.lua
--[[ $%BEGINLICENSE%$
Copyright (c) 2007, 2012, Oracle and/or its affiliates. All rights reserved.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; version 2 of the
License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
02110-1301 USA
$%ENDLICENSE%$ --]]
---
-- a flexible statement based load balancer with connection pooling
--
-- * build a connection pool of min_idle_connections for each backend and maintain
-- its size
-- *
--
--
local commands = require("proxy.commands")
local tokenizer = require("proxy.tokenizer")
local lb = require("proxy.balance")
local auto_config = require("proxy.auto-config")
--- config
--
-- connection pool
if not proxy.global.config.rwsplit then
proxy.global.config.rwsplit = {
min_idle_connections = 4,
max_idle_connections = 8,
is_debug = false
}
end
---
-- read/write splitting sends all non-transactional SELECTs to the slaves
--
-- is_in_transaction tracks the state of the transactions
local is_in_transaction = false
-- if this was a SELECT SQL_CALC_FOUND_ROWS ... stay on the same connections
local is_in_select_calc_found_rows = false
---
-- get a connection to a backend
--
-- as long as we don't have enough connections in the pool, create new connections
--
function connect_server()
local is_debug = proxy.global.config.rwsplit.is_debug
-- make sure that we connect to each backend at least ones to
-- keep the connections to the servers alive
--
-- on read_query we can switch the backends again to another backend
if is_debug then
print()
print("[connect_server] " .. proxy.connection.client.src.name)
end
local rw_ndx = 0
-- init all backends
for i = 1, #proxy.global.backends do
local s = proxy.global.backends[i]
local pool = s.pool -- we don't have a username yet, try to find a connections which is idling
local cur_idle = pool.users[""].cur_idle_connections
pool.min_idle_connections = proxy.global.config.rwsplit.min_idle_connections
pool.max_idle_connections = proxy.global.config.rwsplit.max_idle_connections
if is_debug then
print(" [".. i .."].connected_clients = " .. s.connected_clients)
print(" [".. i .."].pool.cur_idle = " .. cur_idle)
print(" [".. i .."].pool.max_idle = " .. pool.max_idle_connections)
print(" [".. i .."].pool.min_idle = " .. pool.min_idle_connections)
print(" [".. i .."].type = " .. s.type)
print(" [".. i .."].state = " .. s.state)
end
-- prefer connections to the master
if s.type == proxy.BACKEND_TYPE_RW and
s.state ~= proxy.BACKEND_STATE_DOWN and
cur_idle < pool.min_idle_connections then
proxy.connection.backend_ndx = i
break
elseif s.type == proxy.BACKEND_TYPE_RO and
s.state ~= proxy.BACKEND_STATE_DOWN and
cur_idle < pool.min_idle_connections then
proxy.connection.backend_ndx = i
break
elseif s.type == proxy.BACKEND_TYPE_RW and
s.state ~= proxy.BACKEND_STATE_DOWN and
rw_ndx == 0 then
rw_ndx = i
end
end
if proxy.connection.backend_ndx == 0 then
if is_debug then
print(" [" .. rw_ndx .. "] taking master as default")
end
proxy.connection.backend_ndx = rw_ndx
end
-- pick a random backend
--
-- we someone have to skip DOWN backends
-- ok, did we got a backend ?
if proxy.connection.server then
if is_debug then
print(" using pooled connection from: " .. proxy.connection.backend_ndx)
end
-- stay with it
return proxy.PROXY_IGNORE_RESULT
end
if is_debug then
print(" [" .. proxy.connection.backend_ndx .. "] idle-conns below min-idle")
end
-- open a new connection
end
---
-- put the successfully authed connection into the connection pool
--
-- @param auth the context information for the auth
--
-- auth.packet is the packet
function read_auth_result( auth )
if is_debug then
print("[read_auth_result] " .. proxy.connection.client.src.name)
end
if auth.packet:byte() == proxy.MYSQLD_PACKET_OK then
-- auth was fine, disconnect from the server
proxy.connection.backend_ndx = 0
elseif auth.packet:byte() == proxy.MYSQLD_PACKET_EOF then
-- we received either a
--
-- * MYSQLD_PACKET_ERR and the auth failed or
-- * MYSQLD_PACKET_EOF which means a OLD PASSWORD (4.0) was sent
print("(read_auth_result) ... not ok yet");
elseif auth.packet:byte() == proxy.MYSQLD_PACKET_ERR then
-- auth failed
end
end
---
-- read/write splitting
function read_query( packet )
local is_debug = proxy.global.config.rwsplit.is_debug
local cmd = commands.parse(packet)
local c = proxy.connection.client
local r = auto_config.handle(cmd)
if r then return r end
local tokens
local norm_query
-- looks like we have to forward this statement to a backend
if is_debug then
print("[read_query] " .. proxy.connection.client.src.name)
print(" current backend = " .. proxy.connection.backend_ndx)
print(" client default db = " .. c.default_db)
print(" client username = " .. c.username)
if cmd.type == proxy.COM_QUERY then
print(" query = " .. cmd.query)
end
end
if cmd.type == proxy.COM_QUIT then
-- don't send COM_QUIT to the backend. We manage the connection
-- in all aspects.
proxy.response = {
type = proxy.MYSQLD_PACKET_OK,
}
if is_debug then
print(" (QUIT) current backend = " .. proxy.connection.backend_ndx)
end
return proxy.PROXY_SEND_RESULT
end
-- COM_BINLOG_DUMP packet can't be balanced
--
-- so we must send it always to the master
if cmd.type == proxy.COM_BINLOG_DUMP then
-- if we don't have a backend selected, let's pick the master
--
if proxy.connection.backend_ndx == 0 then
proxy.connection.backend_ndx = lb.idle_failsafe_rw()
end
return
end
proxy.queries:append(1, packet, { resultset_is_needed = true })
-- read/write splitting
--
-- send all non-transactional SELECTs to a slave
if not is_in_transaction and
cmd.type == proxy.COM_QUERY then
tokens = tokens or assert(tokenizer.tokenize(cmd.query))
local stmt = tokenizer.first_stmt_token(tokens)
if stmt.token_name == "TK_SQL_SELECT" then
is_in_select_calc_found_rows = false
local is_insert_id = false
for i = 1, #tokens do
local token = tokens[i]
-- SQL_CALC_FOUND_ROWS + FOUND_ROWS() have to be executed
-- on the same connection
-- print("token: " .. token.token_name)
-- print(" val: " .. token.text)
if not is_in_select_calc_found_rows and token.token_name == "TK_SQL_SQL_CALC_FOUND_ROWS" then
is_in_select_calc_found_rows = true
elseif not is_insert_id and token.token_name == "TK_LITERAL" then
local utext = token.text:upper()
if utext == "LAST_INSERT_ID" or
utext == "@@INSERT_ID" then
is_insert_id = true
end
end
-- we found the two special token, we can't find more
if is_insert_id and is_in_select_calc_found_rows then
break
end
end
-- if we ask for the last-insert-id we have to ask it on the original
-- connection
if not is_insert_id then
local backend_ndx = lb.idle_ro()
if backend_ndx > 0 then
proxy.connection.backend_ndx = backend_ndx
end
else
print(" found a SELECT LAST_INSERT_ID(), staying on the same backend")
end
end
end
-- no backend selected yet, pick a master
if proxy.connection.backend_ndx == 0 then
-- we don't have a backend right now
--
-- let's pick a master as a good default
--
proxy.connection.backend_ndx = lb.idle_failsafe_rw()
end
-- by now we should have a backend
--
-- in case the master is down, we have to close the client connections
-- otherwise we can go on
if proxy.connection.backend_ndx == 0 then
return proxy.PROXY_SEND_QUERY
end
local s = proxy.connection.server
-- if client and server db don't match, adjust the server-side
--
-- skip it if we send a INIT_DB anyway
if cmd.type ~= proxy.COM_INIT_DB and
c.default_db and c.default_db ~= s.default_db then
print(" server default db: " .. s.default_db)
print(" client default db: " .. c.default_db)
print(" syncronizing")
proxy.queries:prepend(2, string.char(proxy.COM_INIT_DB) .. c.default_db, { resultset_is_needed = true })
end
-- send to master
if is_debug then
if proxy.connection.backend_ndx > 0 then
local b = proxy.global.backends[proxy.connection.backend_ndx]
print(" sending to backend : " .. b.dst.name);
print(" is_slave : " .. tostring(b.type == proxy.BACKEND_TYPE_RO));
print(" server default db: " .. s.default_db)
print(" server username : " .. s.username)
end
print(" in_trans : " .. tostring(is_in_transaction))
print(" in_calc_found : " .. tostring(is_in_select_calc_found_rows))
print(" COM_QUERY : " .. tostring(cmd.type == proxy.COM_QUERY))
end
return proxy.PROXY_SEND_QUERY
end
---
-- as long as we are in a transaction keep the connection
-- otherwise release it so another client can use it
function read_query_result( inj )
local is_debug = proxy.global.config.rwsplit.is_debug
local res = assert(inj.resultset)
local flags = res.flags
if inj.id ~= 1 then
-- ignore the result of the USE <default_db>
-- the DB might not exist on the backend, what do do ?
--
if inj.id == 2 then
-- the injected INIT_DB failed as the slave doesn't have this DB
-- or doesn't have permissions to read from it
if res.query_status == proxy.MYSQLD_PACKET_ERR then
proxy.queries:reset()
proxy.response = {
type = proxy.MYSQLD_PACKET_ERR,
errmsg = "can't change DB ".. proxy.connection.client.default_db ..
" to on slave " .. proxy.global.backends[proxy.connection.backend_ndx].dst.name
}
return proxy.PROXY_SEND_RESULT
end
end
return proxy.PROXY_IGNORE_RESULT
end
is_in_transaction = flags.in_trans
local have_last_insert_id = (res.insert_id and (res.insert_id > 0))
if not is_in_transaction and
not is_in_select_calc_found_rows and
not have_last_insert_id then
-- release the backend
proxy.connection.backend_ndx = 0
elseif is_debug then
print("(read_query_result) staying on the same backend")
print(" in_trans : " .. tostring(is_in_transaction))
print(" in_calc_found : " .. tostring(is_in_select_calc_found_rows))
print(" have_insert_id : " .. tostring(have_last_insert_id))
end
end
---
-- close the connections if we have enough connections in the pool
--
-- @return nil - close connection
-- IGNORE_RESULT - store connection in the pool
function disconnect_client()
local is_debug = proxy.global.config.rwsplit.is_debug
if is_debug then
print("[disconnect_client] " .. proxy.connection.client.src.name)
end
-- make sure we are disconnection from the connection
-- to move the connection into the pool
proxy.connection.backend_ndx = 0
end
启动mysql-proxy
[root@mysql-proxy ~]# service mysql-proxy start
Starting mysql-proxy: [ OK ]
[root@mysql-proxy ~]# ss -anptl
State Recv-Q Send-Q Local Address:Port Peer Address:Port
LISTEN 0 128 :::111 :::* users:(("rpcbind",1627,11))
LISTEN 0 128 *:111 *:* users:(("rpcbind",1627,8))
LISTEN 0 128 :::22 :::* users:(("sshd",2079,4))
LISTEN 0 128 *:22 *:* users:(("sshd",2079,3))
LISTEN 0 128 127.0.0.1:631 *:* users:(("cupsd",1938,7))
LISTEN 0 128 ::1:631 :::* users:(("cupsd",1938,6))
LISTEN 0 128 *:47000 *:* users:(("rpc.statd",1837,9))
LISTEN 0 100 ::1:25 :::* users:(("master",2174,13))
LISTEN 0 100 127.0.0.1:25 *:* users:(("master",2174,12))
LISTEN 0 128 :::53369 :::* users:(("rpc.statd",1837,11))
LISTEN 0 128 *:4040 *:* users:(("mysql-proxy",19973,10))
LISTEN 0 128 *:4041 *:* users:(("mysql-proxy",19973,11))
在mysql-proxy上登录
[root@mysql-proxy ~]# mysql -u root -pmypass -h 192.168.30.115 -P4040
mysql> create database testdb;
Query OK, 1 row affected (0.01 sec)
mysql> use testdb
server default db:
client default db: testdb
syncronizing
Database changed
mysql> create table testA(id int);
Query OK, 0 rows affected (0.43 sec)
# 分别在主从服务器上使用tcpdump命令抓包
[root@master ~]# tcpdump -i eth0 -s0 -nn -A tcp dst port 3306 and dst host 192.168.30.116
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
[root@slave ~]# tcpdump -i eth0 -s0 -nn -A tcp dst port 3306 and dst host 192.168.30.117
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
批量插入和查询数据
[root@mysql-proxy ~]# for i in {1..50}; do mysql -u root -pmypass -h 192.168.30.115 -P4040 -e 'use testdb; insert into testA values(5);'; done
[root@master ~]# tcpdump -i eth0 -s0 -nn -A tcp dst port 3306 and dst host 192.168.30.116
18:47:09.733244 IP 192.168.30.115.33567 > 192.168.30.116.3306: Flags [P.], seq 301:333, ack 155, win 131, options [nop,nop,TS val 21000991 ecr 23848994], length 32
E..Tqe@.@.
....s...t....[...Jb".....mh.....
[email protected].".....insert into testA values(5)
18:47:09.749683 IP 192.168.30.115.33570 > 192.168.30.116.3306: Flags [.], ack 144, win 131, options [nop,nop,TS val 21001008 ecr 23848972], length 0
E..4..@.@..|...s...t."..r....u.h....>Z.....
[email protected]..
18:47:09.775507 IP 192.168.30.117.38626 > 192.168.30.116.3306: Flags [.], ack 5185, win 499, options [nop,nop,TS val 22264873 ecr 23849027], length 0
E..4..@[email protected].....$......
.S.).k.C
18:47:09.778730 IP 192.168.30.115.33572 > 192.168.30.116.3306: Flags [P.], seq 269:301, ack 144, win 115, options [nop,nop,TS val 21001037 ecr 23848927], length 32
E..TA.@.@.:....s...t.$..+L.D\..n...s+0.....
[email protected]
.....J.....:c.P..
18:47:09.779117 IP 192.168.30.115.33572 > 192.168.30.116.3306: Flags [.], ack 155, win 115, options [nop,nop,TS val 21001037 ecr 23849040], length 0
E..4A.@.@.:....s...t.$..+L.d\..y...ss......
[email protected]
18:47:09.783718 IP 192.168.30.115.33570 > 192.168.30.116.3306: Flags [P.], seq 290:301, ack 144, win 131, options [nop,nop,TS val 21001040 ecr 23848972], length 11
E..?..@[email protected]."..r....u.h...........
[root@slave ~]# tcpdump -i eth0 -s0 -nn -A tcp dst port 3306 and dst host 192.168.30.117
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
插入50条数据发现，只有master服务器抓到数据更新的包，slave没有
下面模拟50次查询请求，查看效果
[root@master ~]# tcpdump -i eth0 -s0 -nn -A tcp dst port 3306 and dst host 192.168.30.116
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
18:55:32.032655 IP 192.168.30.115.33567 > 192.168.30.116.3306: Flags [P.], seq 204:215, ack 100, win 131, options [nop,nop,TS val 21503291 ecr 24351256], length 11
E..?sf@.@. ....s...t....[..{Jb-............
.H.;.s.......testdb
18:55:32.048136 IP 192.168.30.115.33572 > 192.168.30.116.3306: Flags [P.], seq 183:215, ack 100, win 115, options [nop,nop,TS val 21503307 ecr 24351259], length 32
E..TC.@[email protected].$..+M..\..n...s.f.....
.H.K.s.......root....f
.....J.....:c.P..
18:55:32.048802 IP 192.168.30.115.33572 > 192.168.30.116.3306: Flags [.], ack 111, win 115, options [nop,nop,TS val 21503308 ecr 24351310], length 0
E..4C.@[email protected].$..+M..\..y...s.T.....
.H.L.s.N
18:55:32.051857 IP 192.168.30.115.33570 > 192.168.30.116.3306: Flags [P.], seq 204:215, ack 100, win 131, options [nop,nop,TS val 21503310 ecr 24351274], length 11
E..?..@[email protected]."..r..9.u.].....E.....
.H.N.s.*.....testdb
18:55:32.056674 IP 192.168.30.115.33574 > 192.168.30.116.3306: Flags [.], ack 100, win 115, options [nop,nop,TS val 21503314 ecr 24351277], length 0
E..4.n@[email protected].&....M2..x....s.......
.H.R.s.-
18:55:32.071103 IP 192.168.30.115.33574 > 192.168.30.116.3306: Flags [P.], seq 183:215, ack 100, win 115, options [nop,nop,TS val 21503329 ecr 24351277], length 32
E..T.o@[email protected].&....M2..x....s.......
.H.a.s.-.....root...Z.5o....|........#".
18:55:32.073535 IP 192.168.30.115.33567 > 192.168.30.116.3306: Flags [.], ack 111, win 131, options [nop,nop,TS val 21503332 ecr 24351294], length 0
E..4sg@.@. ....s...t....[...Jb-............
.H.d.s.>
18:55:32.074669 IP 192.168.30.115.33576 > 192.168.30.116.3306: Flags [P.], seq 204:215, ack 100, win 115, options [nop,nop,TS val 21503333 ecr 24351291], length 11
E..?..@[email protected].(...'..L=`M...s.......
.H.e.s.;.....testdb
18:55:32.075503 IP 192.168.30.115.33576 > 192.168.30.116.3306: Flags [.], ack 111, win 115, options [nop,nop,TS val 21503334 ecr 24351336], length 0
E..4..@[email protected].(...'..L=`X...sB......
.H.f.s.h
18:55:32.090373 IP 192.168.30.115.33567 > 192.168.30.116.3306: Flags [P.], seq 215:247, ack 111, win 131, options [nop,nop,TS val 21503349 ecr 24351294], length 32
E..Tsh@[email protected]....[...Jb-.....L......
.H.u.s.>.....root..S....9r.=*........ct.
18:55:32.091299 IP 192.168.30.115.33567 > 192.168.30.116.3306: Flags [.], ack 122, win 131, options [nop,nop,TS val 21503349 ecr 24351352], length 0
E..4si@.@. ....s...t....[...Jb.......9.....
[root@slave ~]# tcpdump -i eth0 -s0 -nn -A tcp dst port 3306 and dst host 192.168.30.117
18:55:33.701885 IP 192.168.30.115.60055 > 192.168.30.117.3306: Flags [P.], seq 3683:3720, ack 36062, win 501, options [nop,nop,TS val 21504886 ecr 22768728], length 37
E..Y3E@[email protected]....{.....UJ.....8.....
.H#v.[lX!....select @@version_comment limit 1
18:55:33.702932 IP 192.168.30.115.60053 > 192.168.30.117.3306: Flags [P.], seq 3693:3698, ack 36058, win 501, options [nop,nop,TS val 21504887 ecr 22768696], length 5
E..9..@.@._....s...u.....A...........{.....
.H#w.[l8.....
18:55:33.703341 IP 192.168.30.115.60053 > 192.168.30.117.3306: Flags [P.], seq 3698:3720, ack 36091, win 501, options [nop,nop,TS val 21504888 ecr 22768729], length 22
E..J..@.@._....s...u.....A.....7....\......
.H#x.[lY.....SELECT DATABASE()
18:55:33.704708 IP 192.168.30.115.60049 > 192.168.30.117.3306: Flags [P.], seq 3696:3720, ack 35492, win 501, options [nop,nop,TS val 21504889 ecr 22768711], length 24
E..L..@[email protected].....
.H#y.[lG.....select * from testA
18:55:33.725988 IP 192.168.30.115.60057 > 192.168.30.117.3306: Flags [.], ack 36161, win 501, options [nop,nop,TS val 21504911 ecr 22768712], length 0
E..4i.@[email protected].=........o......
.H#..[lH
18:55:33.726996 IP 192.168.30.115.60051 > 192.168.30.117.3306: Flags [.], ack 36161, win 501, options [nop,nop,TS val 21504912 ecr 22768714], length 0
E..4..@[email protected].............
.H#..[lJ
18:55:33.740992 IP 192.168.30.115.60055 > 192.168.30.117.3306: Flags [.], ack 36161, win 501, options [nop,nop,TS val 21504926 ecr 22768728], length 0
E..43F@[email protected]=...s...u....{.....U......_.....
.H#..[lX
18:55:33.742949 IP 192.168.30.115.60053 > 192.168.30.117.3306: Flags [.], ack 36161, win 501, options [nop,nop,TS val 21504928 ecr 22768730], length 0
E..4..@.@._....s...u.....A.....}...........
.H#..[lZ
18:55:33.744968 IP 192.168.30.115.60049 > 192.168.30.117.3306: Flags [.], ack 36161, win 501, options [nop,nop,TS val 21504930 ecr 22768731], length 0
E..4..@[email protected]...........
.H#..[l[
测试发现读请求被平均分配到俩台服务器
到此，MySQL 5.6.13基于MySQL-Proxy的读写分离配置完成