| View previous topic :: View next topic |
| Author |
Message |
toralf
Developer
Joined: 01 Feb 2004
Posts: 3942
Location: Hamburg
|
 Posted: Sat Jun 04, 2016 9:26 pm Post subject: why does /etc/conf.d/ntpd has "-g" ? |
 |
|
| I'd assume that /etc/init.d/ntp-client is used to set a time during boot and therefore ntpd shouldn't face any big time jump values, or ? |
|
| Back to top |
|
 |
Syl20
l33t
Joined: 04 Aug 2005
Posts: 621
Location: France
|
| Posted: Mon Jun 06, 2016 9:30 am Post subject: |
|
|
Certainly because some sysadmins don't enable ntp-client and ntpd together ?
Ntpdate sets the correct time immediately (and that may cause some problems, particularly with the logs, and all the services hardly depending on the time, like kerberos-based ones), while ntpd adjusts it smoothly. |
|
| Back to top |
|
|
freke
Veteran
Joined: 23 Jan 2003
Posts: 1050
Location: Somewhere in Denmark
|
| Posted: Mon Jun 06, 2016 6:45 pm Post subject: |
|
|
| Would a Big ntpd jump be any different from a ntp-client jump? |
|
| Back to top |
|
|
Syl20
l33t
Joined: 04 Aug 2005
Posts: 621
Location: France
|
| Posted: Tue Jun 07, 2016 12:55 pm Post subject: |
|
|
| When, for example, some services complain because their log files have a modification time in the future, yes, that could make a difference. And on a server which provides time to several other computers, disabling ntp-client is a good choice. |
|
| Back to top |
|
|
toralf
Developer
Joined: 01 Feb 2004
Posts: 3942
Location: Hamburg
|
| Posted: Tue Jun 07, 2016 7:00 pm Post subject: |
|
|
I do know, how "-g" works.
I do wonder why it is activated for most users as a default value.
Gentoo is about choice
If somebody suffers from time jumps - then that user might add "-g" to his option file. Just because he needs it.
That's why ntp-client (== ntpdate) is not added to default runlevel per default. For the same reason "-g" should not be added as a default value. |
|
| Back to top |
|
|
khayyam
Watchman
Joined: 07 Jun 2012
Posts: 6227
Location: Room 101
|
| Posted: Tue Jun 07, 2016 9:55 pm Post subject: |
|
|
| toralf wrote: | | If somebody suffers from time jumps - then that user might add "-g" to his option file. Just because he needs it. That's why ntp-client (== ntpdate) is not added to default runlevel per default. For the same reason "-g" should not be added as a default value. |
toralf ... I disagree, having -g is the more robust, if there is a (big) discrepency in time then without it ntpd will fail, avoding such a failure should be the default option, particularly as it doesn't effect things otherwise (or are you having an *actual* problem due to the fact -g is enabled?).
As I understand it ntpdate should be used in conjunction with ntpd, but as gentoo doesn't add either to a runlevel it's left to the user to decide what is started or not. ITR the presence '-g' is a resonable default ... and users a free to change it.
best ... khay |
|
| Back to top |
|
|
|
Networking & Security
