CSF Error: *WARNING* Binary location for [HOST] [/usr/bin/host] in /etc/csf/csf.conf is either incorrect, is not installed or is not executable
This is a common error when you first install CSF, more so on CentOS 7.x systems than anything else. Usually this is because /usr/bin/host is missing. Most of the time, the error message is also accompanied by *WARNING* Binary location for [CHATTR] [/usr/bin/chattr] in /etc/csf/csf.conf is either incorrect, is not installed or is not executable as well. To fix both these errors, just run the following command:

yum install bind-utils


Once bind-utils is installed, do not forget to restart csf with csf -r
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