Computers Linux MySQL

Running MySQL Proxy as a daemon

I had to figure out how to setup mySQL Proxy to run as a daemon (system service).
The original information came from this page and has been slightly modified.
It is assumed that mySQL Proxy has been installed and the mysql-proxy executable is located at /usr/local/sbin/mysql-proxy.
The first file is the init.d launch script:


# mysql-proxy This script starts and stops the mysql-proxy daemon
# chkconfig: - 78 30
# processname: mysql-proxy
# description: mysql-proxy is a proxy daemon to mysql

# Source function library.
. /etc/rc.d/init.d/functions



# Source networking configuration.
. /etc/sysconfig/network

# Check that networking is up.
[ ${NETWORKING} = "no" ] && exit 0

# Set default mysql-proxy configuration.

# Source mysql-proxy configuration.
if [ -f /etc/sysconfig/mysql-proxy ] ; then
        . /etc/sysconfig/mysql-proxy


# By default it's all good

# See how we were called.
case "$1" in
        # Start daemon.
        echo -n $"Starting $prog: "
        daemon $NICELEVEL $PROXY_PATH/mysql-proxy $PROXY_OPTIONS --pid-file $PROXY_PID
        if [ $RETVAL = 0 ]; then
                touch /var/lock/subsys/mysql-proxy
        # Stop daemons.
        echo -n $"Stopping $prog: "
        killproc $prog
        if [ $RETVAL = 0 ]; then
                rm -f /var/lock/subsys/mysql-proxy
                rm -f $PROXY_PID
        $0 stop
        sleep 3
        $0 start
       [ -e /var/lock/subsys/mysql-proxy ] && $0 restart
        status mysql-proxy
        echo "Usage: $0 {start|stop|restart|status|condrestart}"

exit $RETVAL
The launch script will either use the default configuration or read it from the file /etc/sysconfig/mysql-proxy if it exists.
To set mysql-proxy parameters create:


# Options to mysql-proxy
# do not remove --daemon
Computers Linux MySQL

(partial) MySQL Proxy API Doc

I have been working a lot with MySQL proxy lately and trying to figure out how it works is a major PITA. There is virtually no documentation for it and the best way to understand how it actually works is to read the source code.

This is a list of API functions discovered by reading plugin.c in the mysql_proxy SVN source. The list may be incomplete or not entirely accurate.

[i] = integer based index

[s] = string based index

[proxy] – data structure shared amongst all lua state machines – sub structure (possibly added for esthetical reasons only)

proxy.backends – array of backends (shared)

proxy.connection – mysql connection object


proxy.backends[i].connected_clients – connected clients

proxy.backends[i].address – server Address



proxy.backends[i].pool – connection pool object


proxy.backends[i].pool.max_idle_connections – max connections

proxy.backends[i].pool.min_idle_connections – min connections

proxy.backends[i].pool.users – hash table containing sockets hashed by username


proxy.backends[i].pool.users[s].cur_idle_connections – number of sockets currently in the pool (meaning they are idle)


proxy.connection.backend_ndx – id of active backend (magic value, setting it can trigger server socket changes, i.e: setting it to 0 returns the socket into the connection pool)

proxy.connection.server – server socket object

proxy.connection.client – client socket object


proxy.connection.client.default_db – database

proxy.connection.client.username – user

proxy.connection.client.address – ip address (?)

proxy.connection.client.scrambled_password – password as it was sent from the client


proxy.connection.server.default_db – database

proxy.connection.server.username – user

proxy.connection.server.address – ip address (?)

proxy.connection.server.scrambled_password – password as it was sent from the client

proxy.connection.server.mysqld_version – mysql version

proxy.connection.server.thread_id – connection id as set during the server handshake

proxy.connection.server.scramble_buffer – password hash (?)

Java Linux Mac OS X MySQL

Add a self-generated SSL certificate to the list of trusted certificates

Usually Java only accepts SSL certificates that can be validated with one of the CA providers in JRE’s internal cacerts keystore.

The cacerts keystore is a file located at $JAVA_HOME/lib/security/cacerts

How to import a self generated SSL certificate

First, export the self-generated key '' to a file called on the server
keytool -export -keystore ~/ -alias -file

Then download the cert file with FTP or SFTP to your local computer.

Finally, import the certificate '' into a local cacerts keystore:
keytool -import -keystore $JAVA_HOME/lib/security/cacerts -storetype jks -alias -file ./


keytool export command ˆ
keytool import command ˆ

Computers Sound Vista Windows

Activating microphone boost on a Soundblaster Audigy SE in Windows Vista

Note: This is a repost of the same article, which got deleted when my website was hacked.

I just spent over two hours figuring out how to get my microphone to work under windows vista 32bits with my new Soundblaster Audigy SE so I’m writing this blog post in the hopes that it will help someone in my situation.

I started by letting vista install the driver by downloading it from the windows update website but that proved to be a big mistake. The sound actually worked great but my microphone input was way too low to be usable on ventrilo. What you usually do in that case is activate mic boost but there was no +20db check box in my sound control panel and there was absolutely no way to increase the volume of my microphone.

What I tried next is downloading official drivers from the creative website. The file is 60MB and took a while to download but since it was gonna fix all my problems it was worth it. Guess what: Installer doesn’t work; it just tells me that there is already a more recent version of the driver installed. So I then proceeded to uninstall the driver through the Windows Device Manager and restart the installer. This time it tells me no supported hardware is found…

This is where I was only inches away from just taking the card out of my PC and return it to the store where I bought it. But there was one last hope, the files extracted by the installer could provide me with a way to install a working driver. I searched for those files, found the driver and installed it et voila, suddenly there is a +20db mic boost check-box and everything works fine.

So here is how I got my sound card to work:

(I give no guarantee that this will work for you and it might even go wrong so save any open documents)

1. download driver from

2. double click SB24_VTDRV_LB_1_04_0077.exe and let it extract the setup files.

3. wait until installer window is shown, once you see a window where you are asked to chose the setup language go to step 4 DON’T CLOSE THE INSTALLER WINDOW.

4. use “windows key” + R to bring up the run dialog, type %WINDIR%\Temp and hit enter.

5. look for a folder called CRF000, the modified date of that folder should be only minutes from your current system time.

6. open the CRF000 folder and inside open the Drivers folder, inside that folder is file called setup.exe that will happily install the official creative diver.

7. when asked if you want to replace your existing drivers say yes obviously ;)

8. Back on the original installer window, click close to cancel the installation because you are done installing already.