Não faça desta maneira, execute lighttpd estritamente como um daemon. O daemon xinetd significa iniciar os serviços que não estão sendo executados o tempo todo. Quando xinetd ve o tráfego, ele "gira" um determinado serviço para atender à necessidade, mas, caso contrário, os processos não estão em execução.
A propósito, você não pode compartilhar uma porta TCP entre 2 daemons / services. Apenas um serviço pode ser vinculado a uma porta TCP específica, essencialmente possuindo-o pela duração do tempo em que está sendo executado.
Fazer assim mesmo
Se você tiver certeza absoluta de que deseja executá-lo desta forma, dê uma olhada neste tutorial que mostra exatamente esse cenário em um Raspberry Pi. O tutorial é intitulado: Iniciando o mysqld e o httpd on demand com xinetd .
Este script foi criado, /etc/xinetd.init.d/lighttpd :
#!/bin/bash
# inspired on this article
# https://www.linuxnet.ch/automatic-tunnels-with-xinetd-and-netcat/
# script is called from xinetd
# script starts and stops service using /etc/init.d scripts
SERVICE=/etc/init.d/lighttpd # script used to start/stop service
PORT=81 # port where end service should listen
PID_FILE=/var/run/lighttpd.pid # pid file generated by init script
REAPER_PID_FILE="/var/run/lighttpd_reaper.pid" # pid file generated by this script
REAPER_SLEEP=180 # The reaper sleeps in seconds and checks for idle conns
LOG=/var/log/syslog # where to log messages
# this function checks if we already have reaper
check_reaper(){
if [ -s $REAPER_PID_FILE ]
then
reaper_pid='cat $REAPER_PID_FILE 2>/dev/null'
ps -p $reaper_pid &> /dev/null
if [ $? -ne 0 ]
then
start_reaper & # If we don't have a reaper we start one
echo $! > $REAPER_PID_FILE
fi
else
start_reaper &
echo $! > $REAPER_PID_FILE
fi
}
# this function starts a reaper, which is a background process that will kill the end service if its inactive
start_reaper(){
while [ -f $PID_FILE ]
do
sleep $REAPER_SLEEP # We wait
touched='stat --printf %W $REAPER_PID_FILE 2>/dev/null' # We check when the reaper PID was last touched
now='date +%s 2>/dev/null'
let idle=$now-$touched
if [ $idle -gt $REAPER_SLEEP ] # If reaper pid has not been touched in more than a sleep cycle we stop the service
then
echo 'date'" REAPER STOPPING SERVICE AFTER BEING $idle" >> $LOG
$SERVICE stop >> $LOG # This is the stop service instruction
rm $REAPER_PID_FILE
exit 0
fi
done
}
# This is where we start our service
start_service(){
sleep 1 # Added a delay to trouble shoot as browsers kickstart several connections, we need to allow the PID file to be created this can be improved.
if [ -s $PID_FILE ] # We check if the PID file for the end service exist to avoid calling the start script when the service has already been started
then
return
else
echo 'date'" STARTING $SERVICE" >> $LOG
$SERVICE start &>> $LOG #this is the start service instruction
return
fi
}
# We probe and wait for the service to come on line
wait_for_service(){
nc -w30 -z 127.0.0.1 $PORT &>/dev/null # probe end port with a timeout of 30 seconds
if [[ $? -ne 0 ]]
then
echo 'date'" XINET SERVICE START ON $PORT TIMED OUT" >> $LOG
fi
}
# This is were all the magic happens netcat passes traffic back and forth
transmit(){
nc -w30 127.0.0.1 $PORT 2>/dev/null # netcat is awesome, timeout flag of 30 seconds can be adjusted
}
# this is the main program that is called every time
main()
{
nc -z 127.0.0.1 $PORT &>/dev/null # We probe the end service
if [[ $? -ne 0 ]] # If its not responding
then
start_service # We start service
wait_for_service # We wait for service to became online
fi
check_reaper # We always check we have a reaper
touch $REAPER_PID_FILE # We log activity by touching the reaper PID file
transmit # We transmit data
exit 0
}
main
E o seguinte serviço xinetd foi criado:
service http
{
disable = no
socket_type = stream
protocol = tcp
port = 80
server = /etc/xinetd.init.d/lighttpd
user = root
wait = no
}