Server Start Stop using screen

**UncleSam** · Feb 23rd 2016

Hallo,

some days ago I needed a startup script based on screen. Killing the process on stop (like most of the scripts do) was not a solution. There should be a CTRL+C "keypress" to tell the process "please shutdown".
With this script you could modify your start and stop events as you need. Currently it is created to manage start and stop of sinusbot (TS3 MusikBot) - feel free to use it as you need (sinusbot post).
(At your own risk - no guarantee and no support!)

This script was made out of two ideas of creating a start / stop script:

Based on: https://github.com/fhd/init-script-template
Screen idea from: http://minecraft.gamepedia.com…als/Server_startup_script

How it works:
(Your could change start and stop behaviour by changing "sudo ..." and "sudo -u ..." lines)

Start
- Create an empty screen session
- Send to screen: switch to "dir" variable path
- Send to screen: "cmd" to start the program
Stop
- Sends to screen CTRL+C ('\003') and CTL+D ('\004'\) to stop process and log out from screen session
- Wait 10 seconds for the process to shut down and close screen session - if it takes more than 10 seconds -> kill the process (had no better idea )

Code

#!/bin/sh
### BEGIN INIT INFO
# Provides:
# Required-Start: $remote_fs $syslog
# Required-Stop: $remote_fs $syslog
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: Start daemon at boot time
# Description: Enable service provided by daemon.
### END INIT INFO
name="sinusbot"
#name=`basename $0`
dir="/opt/ts3soundboard"
cmd="./sinusbot"
user="tsbots"
history=1024
pid_file="/var/run/$name.pid" # managed by root user starting the service
stdout_log="$dir/$name.log" # logfile has to be in a path where user has write permissions
stderr_log="$dir/$name.log" # logfile has to be in a path where user has write permissions
get_pid() {
if [ -z "$user" ]; then
sudo screen -ls | awk '/\.'$name'\t/ {print strtonum($1)}'
else
sudo -u "$user" screen -ls | awk '/\.'$name'\t/ {print strtonum($1)}'
fi
}
is_running() {
if [ -z "$user" ]; then
sudo screen -list | grep -q "$name"
else
sudo -u "$user" screen -list | grep -q "$name"
fi
}
case "$1" in
start)
if is_running; then
echo "Already started"
else
echo "Starting $name"
cd "$dir"
if [ -z "$user" ]; then
# start empty screen session
sudo screen -h $history -dmS $name &
# execute commands to start process
sudo screen -S $name -X stuff 'cd "'$dir'"'$(printf \\r)
sudo screen -S $name -X stuff $cmd' >> "'$stdout_log'" 2>> "'$stderr_log'"'$(printf \\r)
else
# start empty screen session
sudo -u "$user" screen -h $history -dmS $name &
# execute commands to start process
sudo -u "$user" screen -S $name -X stuff 'cd "'$dir'"'$(printf \\r)
sudo -u "$user" screen -S $name -X stuff $cmd' >> "'$stdout_log'" 2>> "'$stderr_log'"'$(printf \\r)
fi
for i in `seq 10`
do
if is_running; then
echo "is running"
break
fi
echo -n "."
sleep 1
done
if ! is_running; then
echo "Unable to start, see $stdout_log and $stderr_log"
exit 1
fi
fi
;;
stop)
if is_running; then
echo -n "Stopping $name.."
if [ -z "$user" ]; then
sudo screen -S $name -X stuff '\003' > /dev/null 2>&1
sudo screen -S $name -X stuff '\004' > /dev/null 2>&1
else
sudo -u "$user" screen -S $name -X stuff '\003' > /dev/null 2>&1
sudo -u "$user" screen -S $name -X stuff '\004' > /dev/null 2>&1
fi
for i in `seq 10`
do
if ! is_running; then
break
fi
if [ -z "$user" ]; then
#sudo screen -S $name -X stuff '\003' > /dev/null 2>&1
sudo screen -S $name -X stuff '\004' > /dev/null 2>&1
else
#sudo -u "$user" screen -S $name -X stuff '\003' > /dev/null 2>&1
sudo -u "$user" screen -S $name -X stuff '\004' > /dev/null 2>&1
fi
echo -n "."
sleep 1
done
echo
if is_running; then
kill `get_pid`
fi
if is_running; then
echo "Not stopped; may still be shutting down or shutdown may have failed"
exit 1
else
echo "Stopped"
fi
else
echo "Not running"
fi
;;
restart)
$0 stop
if is_running; then
echo "Unable to stop, will not attempt to start"
exit 1
fi
$0 start
;;
status)
if is_running; then
echo "Running"
else
echo "Stopped"
exit 1
fi
;;
*)
echo "Usage: $0 {start|stop|restart|status}"
exit 1
;;
esac
exit 0

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