This document is intended for Linux developers. If you notice mistakes, write to: email@example.com
MySQL Proxy is a software interface layer that runs between a MySQL client and one or more MySQL “back end” servers. It can be configured so as to act as a single virtual MySQL server that happens to distribute its data internally across multiple back ends. This makes it a possible candidate for the basis of a database sharding framework.
This document explains how I got MySQL Proxy to work on a Debian (Ubuntu) system. Note: All steps were done as superuser except where otherwise indicated.
The procedure used may or may not work for newer releases of Debian and/or Ubuntu. However, it's discussed here in the hope that it may be useful.
2. Building MySQL Proxy.
2.1. I started with a Debian (Ubuntu) machine that I'd configured as a development system previously.
For the Debian setup steps that I used, or reasonably compatible steps, click here.
2.2. I went to a downloads directory and downloaded a current MySQL Proxy source tarball using the link below. This copy of the link goes to a local copy of the tarball. Therefore it should work:
2.3. I unpacked the source tarball and entered the top-level source directory:
tar zxf mysql-proxy-0.8.3.tar.gz cd mysql-proxy-0.8.3
2.4. I terminated any existing MySQL Proxy instance:
killall -qw mysql-proxy
2.5. I configured, built, and installed the associated software:
sh ./configure \ --prefix=/opt \ --enable-shared=yes \ --enable-static=no \ --mandir=/opt/man make && make install
At this point, installation of the MySQL Proxy core software was believed to be completed.
3. Testing MySQL Proxy.
The next goal was to do a smoke-test of MySQL Proxy.
3.1. I created a text file named /tmp/first.lua and added the following Lua code:
function read_query(packet) if string.byte(packet) == proxy.COM_QUERY then print("DEBUG query: " .. string.sub(packet, 2)) end end
Note: Lua code was used because this is how SQL Proxy works. SQL Proxy runs Lua functions to process and/or modify data.
3.2. I started an instance of the MySQL Proxy daemon as follows:
/opt/bin/mysql-proxy \ --proxy-lua-script=/tmp/first.lua --daemon
and did the following MySQL command, replacing ROOTPASS with the root password for the local copy of MySQL:
mysql -u root -p'ROOTPASS' \ -h 127.0.0.1 -P 4040 -e 'SHOW TABLES FROM test'
This produced the following output, which seemed to confirm that the daemon was working:
DEBUG query: select @@version_comment limit 1 DEBUG query: SHOW TABLES FROM test
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