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Server configuration: Linux with OpenZFS, 2 x E5-2670v2, 128 GB ECC memory, 12 x 4 TB raidz2 + 1 TB SSD for L2ARC.
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My hostname is mirror.docker.ru Disabling Console Program Access
Red Hat Enterprise Linux 4: System Administration Guide
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18.2. Disabling Console Program Access

To disable access by users to console programs, run the following command as root: 

rm -f /etc/security/console.apps/*

In environments where the console is otherwise secured (BIOS and boot loader passwords are set, [Ctrl]-[Alt]-[Delete] is disabled, the power and reset switches are disabled, and so forth), you may not want to allow any user at the console to run poweroff, halt, and reboot, which are accessible from the console by default.

To remove these abilities, run the following commands as root: 

rm -f /etc/security/console.apps/poweroff
rm -f /etc/security/console.apps/halt
rm -f /etc/security/console.apps/reboot
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