reboot

Oracle linux 7.x reboot systemd swap target timeout workaround


There is an issue around currently for Red Hat based systems, Oracle Linux here, in version 7.3. running systemd version 219-30.0.1, having a shutdown or reboot seemingly hang on a failed swap unit (deallocation). A lot of posts on the net discuss the issue, After switching to Ubuntu 15.04 laptop won’t shutdown suggested the w/a, doing a swapoff/swapon bounce in advance, that worked for me, referencing reboot hangs at ‘Reached target Shutdown’. Systemd: Hangs indefinitely on >90% of reboot attempts comprises in in-depth analysis.

I’m not shure, though, whether tmp.mount.hm4: After swap.target is releated, really, because the implemented change is already present on my systems (systemd‘s). I’m much more tending to suspect widespread storage fragmentation on the swap area to cause the relatively long term swap off run-times. In addition, I almost only experienced the issue for systems that have been up for a longer number of days, say from 90 days onwards.

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Scheduling / descheduling linux host reboots via shutdown


Scheduling and/or descheduling linux host reboots is possible with the shutdown -r command using the time parameter (the reboot command, that I usually prefer in favour of clarity, does’nt feature the time parameter, so shutdown -r is the only choice here). Aside from discussing the quite straightforward man page of shutdown, there is two points here to register in your knowledge cells.
First, a (scheduled) shutdown -r hh24:mi execution will hangup itself into background, no need to use job-tools or an &. shutdown -r hh24:mi actually puts systemd-shutdownd in charge of serving the party, this is what you”ll want to expect to see in your running process list, looking for some command effect. Also, a running scheduled shutdown may be cancelled using shutdown -c any time before hh24:mi. Note however, that from around five minutes before hh24:mi, you’ll you’ll no longer be allowed to login the machine, essentially impeding any further control from your side.

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