mysql-proxy做客户端连接转发
功能
用于外网客户端连接内网的MySQL，将此工具安装在中转服务器上。
软件版本
mysql-proxy-0.8.1-linux-rhel5-x86-64bit.tar.gz
简单的配置过程
解压后有5个目录
bin include lib libexec share
进bin目录，查看mysql_proxy的使用帮助
[root@ora01 bin]# ./mysql-proxy --help-all
Usage:
mysql-proxy [OPTION...] - MySQL Proxy
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=<host:port> listening address:port of the admin-server (default: :4041)
--admin-username=<string> username to allow to log in
--admin-password=<string> password to allow to log in
--admin-lua-script=<filename> script to execute by the admin plugin
proxy-module
-P, --proxy-address=<host:port> listening address:port of the proxy-server (default: :4040)
-r, --proxy-read-only-backend-addresses=<host:port> address:port of the remote slave-server (default: not set)
-b, --proxy-backend-addresses=<host:port> 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
-s, --proxy-lua-script=<file> 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=<file> configuration file
--verbose-shutdown Always log the exit code when shutting down
--daemon Start in daemon-mode
--user=<user> Run mysql-proxy as user
--basedir=<absolute path> Base directory to prepend to relative paths in the config
--pid-file=<file> PID file in case we are started as daemon
--plugin-dir=<path> path to the plugins
--plugins=<name> plugins to load
--log-level=(error|warning|info|message|debug) log all messages of level ... or higher
--log-file=<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)
--event-threads number of event-handling threads (default: 1)
--lua-path=<...> set the LUA_PATH
--lua-cpath=<...> set the LUA_CPATH
应用
./mysql-proxy --admin-username=root --admin-password='' --admin-lua-script=/opt/mysql-proxy-0.8.1-linux-rhel5-x86-64bit/lib/mysql-proxy/lua/admin.lua --proxy-backend-addresses=192.168.60.134:3306 --daemon
参数说明：
指定MySQL的用户名和密码、执行mysql-proxy工具的脚本、mysql服务器地址和端口、服务模式
测试
# netstat -tunlp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:4040 0.0.0.0:* LISTEN 29237/mysql-proxy
tcp 0 0 0.0.0.0:4041 0.0.0.0:* LISTEN 29237/mysql-proxy
4040端口是默认的代理端口，客户端连接的时候直接指向此端口
4041是默认的管理模块端口
总结：现在就可以连接中转服务器的4040端口，访问内网的MySQL服务器。除了可以进行连接的转发外，还可以进行查询的监控、过滤、分析、负载均衡（Load Balance）、失败漂移（Failover）等，更多功能以后再研究。