01-14-2007
Probably not. It will depend to some extent on how you resolve hostnames. If you resolve locally, or the DNS server has not been updated, then telnet will still work, even if the host name has changed.
I don't think you will have a problem though, unless the system does not complete a normal reboot. Even then (if you have a hang or crash) you will probably get away with it.
I presume you didn't down or detach any ethernet interfaces, so the change never went into effect and the next time the system boots it will re-read the original hostname, so all should be OK.
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LEARN ABOUT CENTOS
poweroff
HALT(8) halt HALT(8)
NAME
halt, poweroff, reboot - Halt, power-off or reboot the machine
SYNOPSIS
halt [OPTIONS...]
poweroff [OPTIONS...]
reboot [OPTIONS...]
DESCRIPTION
halt, poweroff, reboot may be used to halt, power-off or reboot the machine.
OPTIONS
The following options are understood:
--help
Prints a short help text and exits.
--halt
Halt the machine, regardless of which one of the three commands is invoked.
-p, --poweroff
Power-off the machine, regardless of which one of the three commands is invoked.
--reboot
Reboot the machine, regardless of which one of the three commands is invoked.
-f, --force
Force immediate halt, power-off, reboot. Do not contact the init system.
-w, --wtmp-only
Only write wtmp shutdown entry, do not actually halt, power-off, reboot.
-d, --no-wtmp
Do not write wtmp shutdown entry.
--no-wall
Do not send wall message before halt, power-off, reboot.
EXIT STATUS
On success, 0 is returned, a non-zero failure code otherwise.
NOTES
These are legacy commands available for compatibility only.
SEE ALSO
systemd(1), systemctl(1), shutdown(8), wall(1)
systemd 208 HALT(8)