mysql 读写分离 proxy_mysql proxy读写分离

Dear 丶 2023-01-11 03:56 171阅读 0赞

![76fae1d0576ec1f481835b2c4a623759.png][]

1、编译安装必备软件：

libevent 1.x or higher (1.3b or later is preferred)

lua 5.1.x or higher

glib2 2.6.0 or higher

pkg-config

libtool 1.5 or higher

MySQL 5.0.x or higher developer files

2、安装

可以直接去官方下载二进制，或源码编译安装。

我用的是编译好的二进制：http://mysql.cdpa.nsysu.edu.tw/Downloads/MySQL-Proxy/

tar zxvf mysql-proxy-0.7.2-linux-rhel5-x86-64bit.tar.gz -C /usr/local/web/mysql/

mv /usr/local/web/mysql/mysql-proxy-0.7.2-linux-rhel5-x86-64bit /usr/local/web/mysql/mysql-proxy

vi /etc/profile

加入以下：

export PATH=$PATH:/usr/local/web/mysql/mysql-proxy/sbin/

mysql服务器安装与mysql主从备份省略。

3、测试机器

MySQL Proxy 地址：192.168.0.1(代号P)

MySQL 服务器地址：192.168.0.11(Mater)、192.168.0.22(Slave)

4、mysql proxy配置

帮助查看：

mysql-proxy --help-all

帮助信息：

Usage:

/usr/local/web/mysql/mysql-proxy/libexec/mysql-proxy \[OPTION...\] - MySQL App Shell

Help Options:

\-?, --help Show help options

\--help-all Show all help options

\--help-admin Show options for the admin-module

\--help-proxy Show options for the proxy-module

admin-module

\--admin-address= listening address:port of the admin-server (default: :4041)

\--admin-username= username to allow to log in (default: root)

\--admin-password= password to allow to log in (default: )

\--admin-lua-script= script to execute by the admin plugin

proxy-module

\--proxy-address= listening address:port of the proxy-server (default: :4040)

\--proxy-read-only-backend-addresses= address:port of the remote slave-server (default: not set)

\--proxy-backend-addresses= address:port of the remote backend-servers (default: 127.0.0.1:3306)

\--proxy-skip-profiling disables profiling of queries (default: enabled)

\--proxy-fix-bug-25371 fix bug \#25371 (mysqld > 5.1.12) for older libmysql versions

\--proxy-lua-script= filename of the lua script (default: not set)

\--no-proxy don't start the proxy-module (default: enabled)

\--proxy-pool-no-change-user don't use CHANGE\_USER to reset the connection coming from the pool (default: enabled)

Application Options:

\-V, --version Show version

\--defaults-file= configuration file

\--daemon Start in daemon-mode

\--user= Run mysql-proxy as user

\--basedir= Base directory to prepend to relative paths in the config

\--pid-file= PID file in case we are started as daemon

\--plugin-dir= path to the plugins

\--plugins= plugins to load

\--log-level=(error|warning|info|message|debug) log all messages of level ... or higer

\--log-file= log all messages in a file

\--log-use-syslog log all messages to syslog

\--log-backtrace-on-crash try to invoke debugger on crash

\--keepalive try to restart the proxy if it crashed

\--max-open-files maximum number of open files (ulimit -n)

proxy启动：

mysql-proxy --proxy-read-only-backend-addresses=192.168.0.22:3306 --proxy-backend-addresses=192.168.0.11:3306 --proxy-lua-script=/usr/local/web/mysql/mysql-proxy/share/doc/mysql-proxy/rw-splitting.lua --keepalive >> /var/log/mysql-proxy.log &

参数说明：

\--proxy-read-only-backend-addresses -- remote slave-server(只读服务器)

\--proxy-backend-addresses           -- master-server(写服务器)

\--proxy-lua-script                  -- lua script(读写分离脚本)

\--keepalive                         -- restart the proxy if it crashed(mysql-proxy宕掉重启)

注意：官方的rw-splitting.lua有bug，很无语~~

我碰到的是：

2009-10-29 22:21:02: (critical) proxy-plugin.c:259: read\_query\_result() in /usr/local/web/mysql/mysql-proxy/share/doc/mysql-proxy/rw-splitting.lua tries to modify the resultset, but hasn't asked to buffer it in proxy.query:append(..., \{ resultset\_is\_needed = true \}). We ignore the change to the result-set.

2009-10-29 22:21:02: (critical) proxy-plugin.c:1238: proxy.queries:append() in /usr/local/web/mysql/mysql-proxy/share/doc/mysql-proxy/rw-splitting.lua can only have one injected query without \{ resultset\_is\_needed = true \} set. We close the client connection now.

有网友推荐0.7.\*下这个rw-splitting.lua不错。

http://bazaar.launchpad.net/~mysql-proxy-developers/mysql-proxy/0.7/annotate/head:/lib/rw-splitting.lua

测试准备：

1、在Master建立一个数据库test，建立一个用户：name密码：123456对该数据库有你要使用的权限。

2、实现Mster和Slave对test数据库的replication(主从备份)。

3、在Slave建立一个与第一步Master同样的帐户密码，并且对test从数据库有你需要的权限。

测试读写分离与结果：

连接mysql proxy

mysql -h192.168.0.1 -P4040 -uname -p123456

注意：默认要开启4个以上连接才能读写分离，不然读写都在Master。

也可以更改rw-splitting.lua脚本中相关参数

min\_idle\_connections = 4,