On 11 Feb 2011, at 10:03, Ger Hooton wrote:
> Q1: How can I find out how a machine was shutdown, was it from a
> command, power on/off button, pulling out the power lead? I have look
> in /var/log/messages and I see "shutdown: shutting down for system halt"
> Where can I get more details?
That looks like a clean shutdown i.e. not just powered off.
> Q2: How can I prevent non privileged users from doing a shutdown or
Keep them away from the machine. A non privileged user can't shutdown
the system from the command line, but if he has access to the machine he can hit Ctrl-Alt-Del which will usually either shut it down or reboot it - what it does is configurable via /etc/inittab, and you could make it so that Ctrl-Alt-Del does nothing. However, if somebody has access to the console they likely have access to the machine too, so could simply remove power.
The only truly secure computer is one which is powered off, in a locked room with armed guards. The first step towards reducing security is powering it on, and it's all down hill from there. If you must power it on :-) the first step in avoiding a further reduction in system security is continuing to restrict physical access to the machine.
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