To disable CTRL+ALT+DEL key is configured to use /etc/inittab file. Login as root and edit /etc/inittab file and remove ctrlaltdel entry.
Type the following command

# vi /etc/inittab

Find lines that read as follows

# Trap CTRL-ALT-DELETE
ca::ctrlaltdel:/sbin/shutdown -t3 -r now

Delete or comment out line by prefixing “#”

# Trap CTRL-ALT-DELETE
#ca::ctrlaltdel:/sbin/shutdown -t3 -r now

Save and close the file. Type command to reload /etc/inittab

# init q

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