Is section logging in krb5.conf works on the kerberos client?

Question

Client /etc/krb5.conf:

...
[logging] 
default = FILE:/var/log/krb5libs.log 
kdc = FILE:/var/log/krb5kdc.log 
admin_server = FILE:/var/log/kadmind.log
...

Kerberos client worked, but log files are empty... write permissions on files granted to all.