svn commit: r326095 - head/usr.sbin/bsdinstall/scripts

[Rodney W. Grimes]

> 
>  Hi Devin,
> 
> On Thu, 23 Nov 2017 01:33:39 -0800
> Devin Teske <devin at shxd.cx> wrote:
> 
> > 
> > 
> > > On Nov 22, 2017, at 11:15 PM, Emmanuel Vadot <manu at bidouilliste.com> wrote:
> > > 
> > >> On 2017-11-22 17:38, Ian Lepore wrote:
> > >>> On Wed, 2017-11-22 at 15:27 +0000, Emmanuel Vadot wrote:
> > >>> Author: manu
> > >>> Date: Wed Nov 22 15:27:47 2017
> > >>> New Revision: 326095
> > >>> URL: https://svnweb.freebsd.org/changeset/base/326095
> > >>> Log:
> > >>>   bsdinstall: Add ntpdate option
> > >>>   
> > >>>   When you install a computer for the first time, the date in the CMOS sometimes
> > >>>   not accurate and you need to ntpdate as ntpd will fail a the time difference
> > >>>   is too big.
> > >>>   Add an option in bsdinstall to enable ntpdate that will do that for us.
> > >>>   
> > >>>   Reviewed by:    allanjude
> > >>>   Differential Revision:    https://reviews.freebsd.org/D13149
> > >>> Modified:
> > >>>   head/usr.sbin/bsdinstall/scripts/services
> > >>> Modified: head/usr.sbin/bsdinstall/scripts/services
> > >>> ==============================================================================
> > >>> --- head/usr.sbin/bsdinstall/scripts/services    Wed Nov 22 15:18:11 2017    (r326094)
> > >>> +++ head/usr.sbin/bsdinstall/scripts/services    Wed Nov 22 15:27:47 2017    (r326095)
> > >>> @@ -46,6 +46,8 @@ DAEMONS=$( dialog --backtitle "FreeBSD Installer" \
> > >>>      local_unbound "Local caching validating resolver" ${local_unbound:-off} \
> > >>>      sshd    "Secure shell daemon" ${sshd_enable:-off} \
> > >>>      moused    "PS/2 mouse pointer on console" ${moused_enable:-off} \
> > >>> +    ntpdate    "Synchronize system and network time at bootime" \
> > >>> +        ${ntpdate_enable:-off} \
> > >>>      ntpd    "Synchronize system and network time" ${ntpd_enable:-off} \
> > >>>      powerd    "Adjust CPU frequency dynamically if supported" \
> > >>>          ${powerd_enable:-off} \
> > >> The right way to enable a time-step at boot is to set the rc conf
> > >> variable ntpd_sync_on_start to YES.  ntpdate has been deprecated for
> > >> *years*.
> > >> -- Ian
> > > 
> > > Hi Ian,
> > > 
> > > Thanks I didn't know about option -g (nor ntpd_sync_on_start), this bring a few questions :
> > > 
> > > - Is there any reason to not always use -g for ntpd ? As a lambda user I just want my time to be set, no matter what.
> > > - Should we remove ntpdate in -current before 12 if it's deprecated ?
> > > 
> > > I'll make the necessary changes according to your (or others) answers.
> > > 
> > 
> > I would not remove ntpdate.

I concur, as ntpdate is trivial to use, ntpd -pg requires a proper /etc/ntp.conf,
though that is trival too you well not get what you want if you do not have
that.

> > Is there a way to make ntpd sync and then quit immediately?
> 
>  Just by reading the man I see the -q option which does exactly that.
>  Setting both -q and -g should have the same behavior than ntpdate (not
> tested).

ntpd -pg is the preferred method per the ntp.org documentation:
https://support.ntp.org/bin/view/Dev/DeprecatingNtpdate

> 
> > If not, sounds like ntpdate serves a purpose not filled by ntpd.
> > 
> > Valid case is someone running a VM that gets paused for days, weeks, or even months at a time. On such a VM it may make more sense to let the clock be only sporadically managed in an adhoc manner.
> > 
> > I personally like to use ntpdate on said VMs because I generally set a timeout on my ssh-agent in said VMs and by managing the clock manually allows me to better control keys loaded.
> > 
> > Pretty sure other people may have other reasons for non-daemonized clock management.
> 
>  That's why I asked :)

I think that the ntp distribution still contains ntpdate, so long as that is true
we should continue to include it in FreeBSD.  When/if they remove it from the
official ntp distribution then this issue shall need a revist.

> > -- 
> > Devin
> 
> -- 
> Emmanuel Vadot <manu at bidouilliste.com> <manu at freebsd.org>

-- 
Rod Grimes                                                 rgrimes at freebsd.org