[nos-bbs] don't change linux time while jnos is running

Michael Fox - N6MEF n6mef at mefox.org
Sun Jan 9 17:38:34 EST 2011

Yes, it's generally bad practice to "slam" the date to a new value.  Several
parts of linux won't like that - not just JNOS - and most Linux
documentation will warn you about that.  If you must use that command, then
reboot right away. Better to use NTP which doesn't abruptly change the time,
but speeds up or slows down the clock so that it eventually syncs.

If your local JNOS system does not have internet access, but one that is
reachable over the air does have internet access, you can run an NTP server
on the remote system and have your local system sync to it over the air.

Windows comes with a NTP client which is fine for keeping your own machine
up to date, as long as you have Internet access.  But it doesn't come with
an NTP server (which you only need if you want to provide time updates to
others).  If you need a Windows-based NTP server, check out Meinberg NTP for
Windows.  Works FB.


-----Original Message-----
From: nos-bbs-bounces at tapr.org [mailto:nos-bbs-bounces at tapr.org] On Behalf
Of Maiko Langelaar
Sent: Sunday, January 09, 2011 7:21 AM
To: NOS BBS Mailing List
Subject: [nos-bbs] don't change linux time while jnos is running

Morning to all,

I just thought of something I should mention based on an
experience I had several months ago. My system time was off
by over an hour, so I adjusted it using the 'date' command.

IF you change the linux time while JNOS is running, you will
hang your system, or it will go into high cpu usage, or just
behave like it's struggling with something. Even if you change
it by a few minutes, you risk JNOS becoming unusable. The only
way to restart it would be a 'pkill -9 jnos' type of thing.

Give it a try, what the heck, let me know what you find :)

At the time, I tried some quick fix ideas, but none of them
worked, it's still on my list of things to fix, but I felt people
should be aware of this. To be frank, I have not really watched
for this during the seasonal time changes, probably should now.


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