Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/21669#discussion_r223861857
--- Diff: docs/security.md ---
@@ -722,7 +722,84 @@ with encryption, at least.
The Kerberos login will be periodically renewed using the provided
credentials, and new delegation
tokens for supported will be created.
+## Secure Interaction with Kubernetes
+
+When talking to Hadoop-based services behind Kerberos, it was noted that
Spark needs to obtain delegation tokens
+so that non-local processes can authenticate. These delegation tokens in
Kubernetes are stored in Secrets that are
+shared by the Driver and its Executors. As such, there are three ways of
submitting a Kerberos job:
+
+In all cases you must define the environment variable: `HADOOP_CONF_DIR`
or
+`spark.kubernetes.hadoop.configMapName` as well as either
+`spark.kubernetes.kerberos.krb5.location` or
`spark.kubernetes.kerberos.krb5.configMapName`.
+
+It also important to note that the KDC needs to be visible from inside the
containers if the user uses a local
--- End diff --
Not just "if the user uses a local krb5 file".
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