====== create a customized daemon via systemd ====== 

   Create a ppa.service under folder /etc/systemd/system
   sudo chmod +x /etc/systemd/system/ppa.service
   sudo systemctl enable ppa
   sudo systemctl status ppa
   sudo systemctl daemon-reload

File /etc/systemd/system/ppa.service
<file>
[Unit]
Description=ppa deamon
After=mysql.service
After=network.service

[Service]
#ExecStart= /testserver/d.sh
ExecStart=  /testserver/dispatch/dispatch.py

[Install]
WantedBy=default.target
</file>

======  Singapore Timezone ====== 
sudo dpkg-reconfigure tzdata

sudo apt-get install ntp

timedatectl
<file>
 Local time: Min 2016-12-18 17:00:11 SGT
  Universal time: Min 2016-12-18 09:00:11 UTC
        RTC time: Min 2016-12-18 09:00:11
       Time zone: Asia/Singapore (SGT, +0800)
 Network time on: yes
NTP synchronized: yes
 RTC in local TZ: no
</file>