SunCrescent Technologies

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:

/etc/init.d/mysql-proxy

#!/bin/sh
#
# 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

PROXY_PATH="/usr/local/sbin"

prog="mysql-proxy"

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

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

# Set default mysql-proxy configuration.
PROXY_OPTIONS="--daemon"
PROXY_PID=/var/run/mysql-proxy.pid

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

PATH=$PATH:/usr/bin:/usr/local/bin:$PROXY_PATH

# By default it's all good
RETVAL=0

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

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:

/etc/sysconfig/mysql-proxy

# Options to mysql-proxy
# do not remove --daemon
PROXY_OPTIONS="
 --daemon
 --proxy-backend-addresses=127.0.0.1:3306
 --proxy-backend-addresses=127.0.0.1:3307
 --proxy-lua-script=load-balancing.lua"

Stefan Graf

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