Neil Bothwick <n...@digimed.co.uk> wrote: > On Thu, 27 Apr 2017 16:56:00 -0500, Dale wrote: > > > One thing about alt sysreq, once you get to a certain point, you > > have to go "all the way" with it. I've found that just the R and E > > generally gets things back to a point it is accessible and I don't > > have to go through it all. I think once you get to the I or S, > > it's all or nothing at that point. Even after the E, you may have > > to start/restart some init processes. FYI, I'm pretty sure the S > > is what syncs the file systems and the U unmounts everything. Of > > course, the B reboots. I can't recall what the others do exactly. > > R resets the keyboard. E sends a SIGTERM to all processes except PID1, > which is why you need to restart services after pressing it. I sends a > SIGKILL similarly. As you say S syncs ass filesystems, U unmounts > filesystems and remounts them readonly and B reboots. > > Once you have got to E, you need to restart stuff. You may get away > with switching runlevels to bring up all your services, or you may > decide that once the system has got itself into a state that has you > reaching for SysRq, a reboot is in order.
Most of the keys are documented here: https://wiki.ubuntuusers.de/Magic_SysRQ/ And even more in the kernel directory at Documentation/sysrq.txt. I will pin these synopsis onto the backside of my monitor. :-) -- Regards wabe
pgpiR79ue9efn.pgp
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