[CentOS] systemctl reboot -- server not accessible after reboot

[Mike]

On Sat, Oct 14, 2017 at 6:24 PM, Jonathan Billings <billings at negate.org> wrote:
>
> When you say that the monitor is plugged in, and the server is unresponsive, does that mean that the monitor doesn’t even come active?  That sounds like it might have crashed the kernel in a way that the display isn’t showing.
>
> You could set up kdump to catch that.  You could also set up a persistent journal (create /var/log/journal) and try again, then when you manually power it up, check to see if anything was logged in the journal.
>
> If the system’s keyboard is plugged in, you could try using the magic sysrq keys to get it to do something.  (see https://en.wikipedia.org/wiki/Magic_SysRq_key )
> Try ‘c’ to initiate a crashdump to force kdump to record a kernel dump, then you can examine the active processes.  ‘k’ or ‘g’ might clean up the display if it’s bad.
>
> Also, remote syslog is always helpful for these kinds of situations, although if the network is down when it crashes then it won’t be as helpful, which is why I suggest looking at the journal.
>
> --

1. Monitor is on but screen is blank.
2. kdump logging --- i'll follow up on that.
3. remote syslog --- i'll need to do some more rtfm. I looked at
/var/log/anaconda/syslog but I can't tell which boot-up I was looking
at.  Seemed like everything was normal...identifying naming locating
hardware/devices....systemd services starting and running.