BIND, named, or bind9 is a DNS server.
managed-keys-zone ./IN: loading from master file managed-keys.bind failed: file not found
Change permissions on all files in
bind:bind. This step may resolve the problem right away.
include "/etc/bind/named.conf.options"; include "/etc/bind/named.conf.local"; include "/etc/bind/named.conf.default-zones"; include "/etc/bind/bind.keys";
The last entry should have been missing. After adding it, the problem should be resolved.