How to Create a Service

Create a service file and put in /etc/init.d/fake.service:

#!/bin/bash
# fake_service
# Starts up, writes to a dummy file, and exits
#
# chkconfig: 35 69 31
# description: This service doesn't do anything.
# Source function library

. /etc/sysconfig/fake_service

case"$1" in start) 
    
    echo "Running fake_service in start mode..."
    touch /var/lock/subsys/fake_service
    echo "$0start at $(date)" >> /var/log/fake_service.log
    
    if[${VAR1} ="true" ]
    then
        echo"VAR1 set to true" >> /var/log/fake_service.log
    fi
    echo
    ;;
    stop)
    echo "Running the fake_service script in stop mode..."
    echo "$0stop at$(date)" >> /var/log/fake_service.log
    if[${VAR2} ="true" ]
    then
        echo"VAR2 = true" >> /var/log/fake_service.logfirm -f /var/lock/subsys/fake_service
    echo
    ;;
    *)
    echo"Usage: fake_service {start | stop}"
    exit 1
esac
exit 0

Create a config file in /etc/sysconfig/fake.service (RHEL) or /etc/default/fake.service (Debian):
```
VAR1="true"
VAR2="true"
```
Give permission:
```
sudo chmod 755 /etc/init.d/fake.service
```

Test script

sudo service fake_service
sudo service fake_service start
sudo service fake_service stop

Start servce whenever system starts:

# Will generate error, next command will add it
sudo chkconfig --list fake_service
sudo chkconfig --add fake_service
sudo chkconfig fake_service on
sudo chkconfig fake_service off