ubutnu-service.txt

###### For Ubuntu 16 and 17 #########

## for ubuntu 16-17 ++ ###
### In /etc/systemd/system/myservice.service ###

[Unit]
Description= CPU monitor
After=Network.target

[Service]
User=root
Restart=always
Type=forking
Restart=10
ExecStart=/bin/sh /etc/service/cpu.sh

[Install]
WantedBy=multi-user.target

## execute sudo systemctl daemon-reload and sudo systemctl start cpu.service ## service will restart after reboot (After=Network.target)


other way to do this is

##### In /etc/init/myservice.conf ######
 
description "service"
author      "Pierre Goude"

# used to be: start on startup
# until we found some mounts weren't ready yet while booting

start on started mountall
stop on shutdown

# automatically respawn

respawn
respawn limit 99 5

script


    exec /bin/sh /etc/service/script.sh

end script

post-start script


end script



## execute sudo start myservice

##############################################################################################

######## For Ubuntu 14 ########

init.d/binbackup

#! /bin/sh
### BEGIN INIT INFO
# Provides: Service
# Required-Start: $remote_fs $syslog
# Required-Stop: $remote_fs $syslog
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: Service
# Description: This file starts and stops Tomcat server
#
### END INIT INFO


case "$1" in
 start)
   /bin/sh /etc/service/script.sh
   ;;
 stop)
    command here
 ;;
 restart)
   command here
   ;;
 *)
   echo "Usage: binbackup {start|stop|restart}" >&2
   exit 3
   ;;
esac


## execute sudo start myservice



################# Example of service ##########################

## this is a simple script that will log services/programs that are using more than 80% of the CPU ##


### throw in the script in an eternal loop with while ###
while true
do
### run top and pipe to only get cpu values over 80% and log them ####
sudo top -b -n 1 | awk '$10 > 80 {print ;}' | sudo tee -a /var/log/CPUmonitor.log

### create an own logrotate just, you can do this in logrotate, but this is fun too ###
logrotation=$( ls -l /var/log/CPUmonitor.log | awk '{print $5}' )
if [ $logrotation -gt 500000 ]
then
sudo rm -rf | /var/log/CPUmonitor.log
else
### just add somthing to separate lines in the log, for fun ###
echo "___________________________________________________________________" | sudo tee -a /var/log/CPUmonitor.log
fi
### add a delay of seconds, for 2 reasons. 1 the service might get heavy if it runs so "fast" 2. too much log ""
sleep 10
done