Sync Clock on Alpine

I am using Alpine Linux on Raspberry Pi. The Pi does not have a hardware clock and over time Alpine’s clock drifts quite a bit.

To fix this I am using the ntp daemon. It can be installed and started with

rc-update add ntpd
service ntpd start

To sync one can use this command with admin rights:

chronyc makestep

To make this sync regularly, I have a cron job running this command at midnight every day. Enter the editor with crontab -e and add this line

# min   hour    day     month   weekday command
0       0       *       *       *       chronyc makestep