Date: Sat, 08 Aug 2020 12:54:34 -0400 From: Ernie Luzar <luzar722@gmail.com> To: Polytropon <freebsd@edvax.de> Cc: freebsd-questions@freebsd.org Subject: Re: Best way to make a machine boot with or without a Internet connection Message-ID: <5F2ED8CA.3070201@gmail.com> In-Reply-To: <20200808182528.371dbadf.freebsd@edvax.de> References: <CAGBxaXnaokaYSPQFK%2BWg6Ym3BxD=nin%2BMha21G8FbfcsCTuVYw@mail.gmail.com> <CA%2ByoEx_wrT-D6H7DxqWzHNciHZAaLmbPs%2Bny52f8JZrum_LgkQ@mail.gmail.com> <CAGBxaX=0-C29=pJnVbJOWefzWzquhbfLfMtfdfBSKjh569weFA@mail.gmail.com> <20200807211945.ba8fe409.freebsd@edvax.de> <20200808054023.555f71ae@scorpio.seibercom.net> <20200808182528.371dbadf.freebsd@edvax.de>
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Polytropon wrote: > On Sat, 8 Aug 2020 05:40:23 -0400, Jerry wrote: >> 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@bsd.com.br> wrote: >>>> >>>>> On Thu, Aug 6, 2020 at 6:20 PM Aryeh Friedman >>>>> <aryeh.friedman@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@freebsd.org mailing list >>>>>> https://lists.freebsd.org/mailman/listinfo/freebsd-questions >>>>>> To unsubscribe, send any mail to " >>>>>> freebsd-questions-unsubscribe@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. > > If I remember correctly, systemd is _the_ tool to deal with > this kind of situation... ;-) > Is systemd part of the base OS or a port?
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