[SailfishDevel] Warning: File `Makefile' has modification time 0.51 s in the future

[christopher.lamb at thurweb.ch]

Hi Thomas

Earlier this year in addition to my normal day job I took over  
responsibility for a server farm of over 50 servers both real and  
virtual. Their clocks, system and hardware were all over the place.  
This lead to strange knock on effects, like Samba not being able to  
authenticate users via SSSD / LDAP.

In order to git the clocks under control again I was forced to find  
out much more about clock-skew {1} and NTP then I cared for. As a  
result I can be very boring on the subject. 8-)

While ntpdate is a valid pragmatic workaround, it remains a  
workaround, as a properly configured ntp daemon should automatically  
keep your system clock in sub millisecond sync. Be aware also that  
NTDATE is deprecated {2}. Instead you should use ntpd -gq

However if the time is already "too far off" the NTD may never be able  
to catch up (as normally it only makes small jumps {3), or even give  
up altogether.

When I encountered a server with clock(s) "way off" I used the set of  
commands below to get it back in line.

hwclock --show
date
service ntpd stop
ntpd -gq
hwclock --systohc --localtime
service ntpd start
hwclock --show
date

After that, if NTPD is properly configured, then NTP should be able to  
keep the server's system clock in line.

HtH

Chris


{1} the root of all evil
{2} http://support.ntp.org/bin/view/Dev/DeprecatingNtpdate
{3} by my measurements about 1.7 mins per day


Zitat von "Thomas Tanghus" <thomas at tanghus.net>:

> On Monday 14 April 2014 14:49 Chris Walker wrote:
>> I installed the ntp client and it now picks up network time. I'm
>> assuming therefore that there is some time 'slip' between the host
>> machine and VBox.
>
> I had the same problem and now run ntpdate from cron.daily. Turns out my PCs
> clock loses ~5 seconds(sic!) for every 24h :(
>
> --
> Med venlig hilsen / Best Regards
>
> Thomas Tanghus
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>