Hi, sorry for the late response.
I would make sure that your krb5.conf file is correctly set up for your containerized KDC. The krb5.conf file is a configuration file on your filesystem that informs kerberos implementations and clients on how to act, including specifying the default REALM and the addresses to use when contacting the KDC. Usually, this is a file that is stored under /etc somewhere. Since the HDFS repo relies on Hadoop's Kerberos management code, and that relies on the underlying JVM kerberos implementation, there are additional settings that you can provide at JVM startup time that inform it where the krb5.conf file is located if it's not in the default location.