35 lines
640 B
Markdown
35 lines
640 B
Markdown
|
# Basics
|
||
|
|
|
||
|
|
Show system time:
|
||
|
|
|
||
|
|
> date
|
||
|
|
|
||
|
|
Show hardware time:
|
||
|
|
|
||
|
|
> sudo hwclock -r
|
||
|
|
|
||
|
|
Change system time to match hardware time:
|
||
|
|
|
||
|
|
> sudo hwclock --hctosys
|
||
|
|
|
||
|
|
Change hardware time to match system time:
|
||
|
|
|
||
|
|
> sudo hwclock --systohc
|
||
|
|
|
||
|
|
Manually set the hardware time to a specified date:
|
||
|
|
|
||
|
|
> sudo hwclock --set --date="8/25/19 13:30:00"
|
||
|
|
|
||
|
|
# Network Time Providers
|
||
|
|
|
||
|
|
Servers which take their time from an observatory we call Stratum 1 servers. Servers which takes their time from Stratum n servers are Stratum n+1 servers.
|
||
|
|
|
||
|
|
Install ntp with:
|
||
|
|
|
||
|
|
> sudo apt-get install -y ntp
|
||
|
|
|
||
|
|
The shell command for this is `ntpq`. Monitor the service providers using:
|
||
|
|
|
||
|
|
> ntpq -p
|
||
|
|
|