Date: Thu, 10 Jul 2025 21:31:20 +0800 From: Zhenlei Huang <zlei@FreeBSD.org> To: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net> Cc: FreeBSD Current <current@freebsd.org>, Konstantin Belousov <kib@freebsd.org> Subject: Re: sysctl to prevent reboot? Message-ID: <1B1CD603-065D-436F-97D9-DDF65AB7F115@FreeBSD.org> In-Reply-To: <o2o49n7o-793n-q70n-s017-5q9508r363q7@yvfgf.mnoonqbm.arg>
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[-- Attachment #1 --] > On Jul 10, 2025, at 9:18 PM, Bjoern A. Zeeb <bzeeb-lists@lists.zabbadoz.net> wrote: > > Hi, > > I am not sure where but I thought I saw a change fly by which would > prevent a shutdpwn -r /reboot (and possibly halt?) from being executed > while a sysctl was set. > > Does anyone have a reference or have I been dreaming? > > I would find that very helpful for host systems running (multiple) bhyve > instances. Happened twice to me recently that I typed reboot in the wrong > window and restarted my dev machine entirely rather than a guest. > > /bz > > -- > Bjoern A. Zeeb r15:7 > Hi Bjoern A, I believe Konstantin's work [1] and [2] are precisely what you need. [1] https://cgit.freebsd.org/src/commit/?id=7fb88c20eccc3fd2118fda2ba58d7afe2b87f7e3 <https://cgit.freebsd.org/src/commit/?id=7fb88c20eccc3fd2118fda2ba58d7afe2b87f7e3>; shutdown(8): refuse to run if /var/run/noshutdown is present [2] https://cgit.freebsd.org/src/commit/?id=384d976725a5c29734a9227fcdb6ef0807485c91 <https://cgit.freebsd.org/src/commit/?id=384d976725a5c29734a9227fcdb6ef0807485c91>; rc.d: Add precious_machine rc.conf knob to create /var/run/noshutdown Best regards, Zhenlei [-- Attachment #2 --] <html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Jul 10, 2025, at 9:18 PM, Bjoern A. Zeeb <<a href="mailto:bzeeb-lists@lists.zabbadoz.net" class="">bzeeb-lists@lists.zabbadoz.net</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="">Hi,<br class=""><br class="">I am not sure where but I thought I saw a change fly by which would<br class="">prevent a shutdpwn -r /reboot (and possibly halt?) from being executed<br class="">while a sysctl was set.<br class=""><br class="">Does anyone have a reference or have I been dreaming?<br class=""><br class="">I would find that very helpful for host systems running (multiple) bhyve<br class="">instances. Happened twice to me recently that I typed reboot in the wrong<br class="">window and restarted my dev machine entirely rather than a guest.<br class=""><br class="">/bz<br class=""><br class="">-- <br class="">Bjoern A. Zeeb r15:7<br class=""><br class=""></div></div></blockquote></div><div class=""><br class=""></div><div class="">Hi Bjoern A,</div><div class=""><br class=""></div><div class="">I believe Konstantin's work [1] and [2] are precisely what you need.</div><div class=""><br class=""></div><div class="">[1] <a href="https://cgit.freebsd.org/src/commit/?id=7fb88c20eccc3fd2118fda2ba58d7afe2b87f7e3" class="">https://cgit.freebsd.org/src/commit/?id=7fb88c20eccc3fd2118fda2ba58d7afe2b87f7e3</a> shutdown(8): refuse to run if /var/run/noshutdown is present</div><div class="">[2] <a href="https://cgit.freebsd.org/src/commit/?id=384d976725a5c29734a9227fcdb6ef0807485c91" class="">https://cgit.freebsd.org/src/commit/?id=384d976725a5c29734a9227fcdb6ef0807485c91</a> rc.d: Add precious_machine rc.conf knob to create /var/run/noshutdown</div><br class=""><div class=""> <div>Best regards,</div><div>Zhenlei</div> </div> <br class=""></body></html>help
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