Best way to make a machine boot with or without a Internet connection

[Jerry]

On Fri, 7 Aug 2020 21:19:45 +0200, Polytropon stated:
>On Fri, 7 Aug 2020 14:54:13 -0400, Aryeh Friedman wrote:
>> On Fri, Aug 7, 2020 at 1:24 PM Mario Lobo <lobo at bsd.com.br> wrote:
>>   
>> > On Thu, Aug 6, 2020 at 6:20 PM Aryeh Friedman
>> > <aryeh.friedman at gmail.com> wrote:
>> >  
>> > > Due to storm related damage my ISP went out for a few (12) hours
>> > > earlier  
>> > in  
>> > > the week and while I got it usable without a Internet connection
>> > > by  
>> > putting  
>> > > everything in my LAN in /etc/hosts (I also run a local_unbound
>> > > --> local bind9 on my file server which I have created a zone
>> > > file for the LAN machines also), but it was very slow in booting
>> > > due to ntpdate, tomcat  
>> > and  
>> > > sendmail not being to connect to the Internet for either forward
>> > > or  
>> > reverse  
>> > > DNS.   I don't want to turn these services off, but I want to be
>> > > able to  
>> > do  
>> > > a normal boot (no long hangs) if the ISP goes down again.   What
>> > > is the best way to do this?
>> > >
>> > > --
>> > > Aryeh M. Friedman, Lead Developer, http://www.PetiteCloud.org
>> > > _______________________________________________
>> > > freebsd-questions at freebsd.org mailing list
>> > > https://lists.freebsd.org/mailman/listinfo/freebsd-questions
>> > > To unsubscribe, send any mail to "
>> > > freebsd-questions-unsubscribe at freebsd.org"
>> > >  
>> >
>> > This is a long shot but perhaps you could find a way to start these
>> > services in the background (&).
>> >  
>> 
>> Given they are done by /etc/rc based on rc.onf not likely  
>
>The "problem" is that rc, in combination with rc.conf and
>the responsible rc.d/ scripts, determines the order in which
>certain services have to be started. A workaround would be
>to use /etc/rc.local to manually do what rc would do with
>its internal logic. Using this approach, you could set the
>exact order as well as tests for "is currently connected
>to the Internet", starting all subsequent tasks that do
>require an online connection. You would put the first
>steps into the background, using &, and you could then
>even invoke "service netif start" (or parts thereof),
>followed by your own services (such as ntp, webserver,
>mailserver). Such a mechanism could be configured to
>set a flag, for example stupidly simple as a "lock file",
>and repeat to test for Internet availability until the
>Internet becomes available - then stop. Some further
>logic could be added to check if the connection stays
>alive, and if it goes down, stop the services, remove
>the lock file, and keep trying at a specified interval.
>
>Of course, this is all manual stuff, nothing is provided
>by the OS to handle this in an appropriate fashion and
>doesn't even look right... ;-)

I saw something on the web a while ago that sort of addressed this sort
of problem. The user ran a script via cron on boot-up that checked for
a specific conditions then started 'monit' to start the appropriate
applications.

-- 
Jerry
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