Linux Restarter TFS on crash and reboot

[Merrok]

Since there have been many questions on how to make a restarter, I thought I might just make a quick tutorial on how to write a service in linux.

A service always restarts itself when crashed and automatically starts when the server booted.

First make a script that automatically restarts tfs, here you can get creative (for example including PIDs, config and ini files, etc) but to keep it simple lets do it like this:

#!/bin/bash
while true; do /path/to/tfs; sleep 1; done

Now to make this automatically execute, we will create a service
To do so, create a file called (for example) TFS in /etc/init.d
touch /etc/init.d/TFS
This file should contain the following code -- Modify the paths, script, user, etc so it fits your server!

#!/bin/sh
### BEGIN INIT INFO
# Provides:          TFS
# Required-Start:    $local_fs $network $named $time $syslog
# Required-Stop:     $local_fs $network $named $time $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Description:       foo
### END INIT INFO

SCRIPT="screen -dmS tfs && screen -S tfs -X stuff '/path/to/your/restart/script\n'" #Important: dont delete \n
RUNAS=tfs

PIDFILE=/var/run/TFS.pid
LOGFILE=/var/log/TFS.log

start() {
  echo 'Starting service…' >&2
  local CMD="$SCRIPT > \"$LOGFILE\" & echo \$!"
  su -s "/bin/bash" -c "script /dev/null && $CMD" $RUNAS > "$PIDFILE"
  echo 'Service started' >&2
}

stop() {
  echo 'Stopping service…' >&2
  rm -f "$PIDFILE"
  su -s "/bin/bash" -c "script /dev/null && screen -S tfs -X quit" $RUNAS
  echo 'Service stopped' >&2
}

uninstall() {
  echo -n "Are you really sure you want to uninstall this service? That cannot be undone. [yes|No] "
  local SURE
  read SURE
  if [ "$SURE" = "yes" ]; then
    stop
    rm -f "$PIDFILE"
    echo "Notice: log file is not be removed: '$LOGFILE'" >&2
    update-rc.d -f TFS remove
    rm -fv "$0"
  fi
}

case "$1" in
  start)
    start
    ;;
  stop)
    stop
    ;;
  uninstall)
    uninstall
    ;;
  restart)
    stop
    start
    ;;
  *)
    echo "Usage: $0 {start|stop|restart|uninstall}"
esac

Make sure the user chosen has access to the PID and the LOG file.

Now to enable this you need to do the following:
sudo chmod +x /etc/init.d/TFS sudo update-rc.d TFS defaults sudo update-rc.d TFS enable sudo systemctl daemon-reload sudo service TFS start

You can now start/stop/restart/status/uninstall your server using
sudo service TFS start/stop/restart/status

If you uninstall the service, also do sudo systemctl daemon-reload

You can also see all logs in /var/log/TFS.log

I tested the script with a different process. Should work fine for TFS as well.

 

[tomaszek123]

Hi,
Where do I exactly put the user in this script ? As far as i understand you are using account tfs so i made one and gave him permission to home folder
Also when I execute a command
update-rc.d TFS enable

I get this

Failed to enable unit: Unit /run/systemd/generator.late/TFS.service is transient or generated.

My configs:
SCRIPT="screen -dmS tfs && screen -S tfs -X stuff '/home/restarter\n'" #Important: dont delete \n

file in home:

#!/bin/bash
while true; do /ots/tfs; sleep 1; done

My ots location /home/ots/ tfs file is there

 

[walltimer]

When iv done it it deleted all my files! BEWARE!