Bind-9.5.1 logging

[Peter Fraser]

Hi All

I'm trying to configure bind-9.5 logging to help troubleshoot a
problem. I put this in named.conf

logging {
        channel myfile {
        file "/etc/namedb/dns.log";
        severity info;
        print-time yes;
        print-severity yes;
        print-category yes;
        };
        channel myfile-security {
        file "/etc/namedb/dns-security.log";
        severity info;
        };
        category update { myfile; };
        category security { myfile-security; };
};

I then run rndc trace, but the log files stay empty. What could I be
doing wrong?