mysql 读写分离

来源：互联网发布：美国就业率数据2017 编辑：程序博客网时间：2024/05/18 03:33

1、操作环境

windows  ip : 192.168.1.175 (master 可以是Linux 系统)CentOS   ip : 192.168.1.144 (slaver)CentOS   ip : 192.168.1.143 (mysql-proxy 调度器)

2、调度服务器安装 mysql

安装操作和之前Linux 环境的安装一样

mysql-proxy 依赖包较多，先使用 yum 进行安装

gcc* gcc-c++* autoconf* automake* zlib* libxml* ncurses-devel* libmcrypt* libtool* flex* pkgconfig*  libevent*  glib*

编译安装 lua

这里采用源码包进行安装,需要自行下载lua的源码包,实验的时候，放在/usr/local/src 目录，，下载地址：http://www.lua.org/ftp/ 选择一个版本进行下载。

cd /usr/local/srctar zvfx lua-5.1.4.tar.gzcd lua-5.1.4vim  src/Makefile

⚠️ 在 CFLAGS= -O2 -Wall $(MYCFLAGS) 这一行记录里加上-fPIC，更改为 CFLAGS= -O2 -Wall -fPIC $(MYCFLAGS) 来避免编译过程中出现错误。⚠️ make linux 出现系列错误提示解决办法在包含自 lua.h：16 的文件中，从 lua.c：15:luaconf.h:275:31: 错误：readline/readline.h：没有那个文件或目录luaconf.h:276:30: 错误：readline/history.h：没有那个文件或目录lua.c: In function ‘pushline’:lua.c:182: 警告：隐式声明函数 ‘readline’lua.c:182: 警告：赋值时将整数赋给指针，未作类型转换lua.c: In function ‘loadline’:lua.c:210: 警告：隐式声明函数 ‘add_history’make[2]: *** [lua.o] 错误 1make[2]: Leaving directory `/data0/software/lua-5.1.4/src’make[1]: *** [linux] 错误 2make[1]: Leaving directory `/data0/software/lua-5.1.4/src’make: *** [linux] 错误 2

解决方法

yum install libtermcap-devel ncurses-devel libevent-devel readline-devel重新make linux make install

配置环境变量

cp etc/lua.pc   /usr/lib/pkgconfig/export PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/lib/pkgconfig

下载安装mysql-proxy

下载：http://dev.mysql.com/downloads/mysql-proxy/ 一定要下载对应的版本，由于实验用的系统是centos6.6 32位）（根据自己的需求进行下载）：

tar zxvf mysql-proxy-0.8.5-linux-glibc2.3-x86-32bit.tar.gzmv mysql-proxy-0.8.5-linux-glibc2.3-x86-32bit  /usr/local/mysql-proxy

配置mysql-proxy，创建主配置文件

cd /usr/local/mysql-proxymkdir lua #创建脚本存放目录mkdir logs #创建日志目录cp share/doc/mysql-proxy/rw-splitting.lua  ./lua #复制读写分离配置文件vim /etc/mysql-proxy.cnf   #创建配置文件[mysql-proxy]user=root #运行mysql-proxy用户admin-username=proxyuser #主从mysql共有的用户admin-password=123456 #用户的密码proxy-address=192.168.1.144:4040 #mysql-proxy运行ip和端口，不加端口，默认4040proxy-read-only-backend-addresses=192.168.1.143 #指定后端从slave读取数据proxy-backend-addresses=192.168.1.175 #指定后端主master写入数据proxy-lua-script=/usr/local/mysql-proxy/lua/rw-splitting.lua #指定读写分离配置文件位置admin-lua-script=/usr/local/mysql-proxy/lua/admin.lua #指定管理脚本log-file=/usr/local/mysql-proxy/logs/mysql-proxy.log #日志位置log-level=info #定义log日志级别daemon=true    #以守护进程方式运行keepalive=true #mysql-proxy崩溃时，尝试重启

配置admin.lua 文件

⚠️在/etc/mysql-proxy.cnf 配置文件中，还差/usr/local/mysql-proxy/lua/admin.lua  的管理文件，实际现在还没有创建的。所以，现在需要编辑创建admin.lua文件。

mysql-proxy-0.8.5的这个版本，使用下面的admin.lua脚本，对这个版本才是有效的：

vim  /usr/local/mysql-proxy/lua/admin.lua

function set_error(errmsg)        proxy.response = {                type = proxy.MYSQLD_PACKET_ERR,                errmsg = errmsg or "error"        }endfunction 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_RESULTend

修改读写分离配置文件

vim /usr/local/mysql-proxy/lua/rw-splitting.luaif not proxy.global.config.rwsplit then proxy.global.config.rwsplit = {  min_idle_connections = 1, #默认超过4个连接数时，才开始读写分离，改为1  max_idle_connections = 1, #默认8，改为1  is_debug = false }end

启用mysql-proxy

/usr/local/mysql-proxy/bin/mysql-proxy --defaults-file=/etc/mysql-proxy.cnfnetstat -tupln | grep 4000 #已经启动killall -9 mysql-proxy #关闭mysql-proxy使用

测试读写分离参考以下资料

读写分离测试参考
http://hellocjq.blog.51cto.com/11336969/1892094

0 0