Interesting -- a Linux box can be "halted" (sort of) but still run. Could be useful for running things like firewalls with high security.

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• (rhk) Sys Admin: Halted Firewalls; Mike Murray, C2002 --

This feature allowed you to run shutdown -h (halt) on the machine, and the firewall would remain active but with no drives mounted and no processes running. That is, the firewall would be in run level 0, but still be filtering packets. However, the list mentioned that this no longer worked in the 2.2.x series kernels.

...

After a relatively short period of time, I concluded that for Red Hat Linux 6.2, removing the following scripts will allow this behavior to occur:

• /etc/rc.d/rc0.d/S00killall
• /etc/rc.d/rc0.d/K90network
• /etc/rc.d/rc0.d/K92ipchains

...

Given that only utilities that run in kernel space will be left intact upon halt, the major limitation for this task is that any type of IP addressing that requires a user-space daemon (e.g., PPP, DHCP) to run will be unable to function in this case.

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• () RandyKramer - 24 Nov 2002
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