SysAdmin

Lose track of which private key pairs with which certificate? Use OpenSSL to compare public key hashes and confirm the match in seconds.

HDFS proxy users let you configure impersonation so specific users can submit jobs or access HDFS on behalf of others. This guide covers the core-site.xml properties, host and group restrictions, and Kerberos considerations for secure clusters.

A look at how Java’s built-in Kerberos implementation uses cRealm and sRealm to determine the path between client and service realms, including hierarchical traversal and capaths configuration.

Kerberos error 44 occurs when the keytab KVNO does not match the KDC database. This guide walks through diagnosing the mismatch and regenerating the keytab to restore authentication.

Walk through inspecting a Hue keytab file, verifying its principals with klist, and confirming that the resulting ticket carries the Renewable flag Hue requires for long-running service operations.

Kerberos authentication failures can be frustrating to debug. Setting the KRB5_TRACE environment variable gives you detailed library-level logging that pinpoints exactly where the exchange breaks down.