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https://issues.apache.org/jira/browse/NIFI-866?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14703682#comment-14703682
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Ricky Saltzer commented on NIFI-866:
------------------------------------
Good news -
After a bit of head scratching, and help from [[email protected]], I was able
to get secure, non-secure, and multi-principal functionality to work within the
same NiFi instance!
The patch approaches the configuration in the following way :
* only *1 option* was added to nifi.properties (nifi.kerberos.krb5.file). This
unavoidable since we have to guarantee only one krb5 is used, as it must be set
on a System property level :/.
* *2 properties* were added to AbstractHadoopProcessor (principal / keytab). If
the supplied Hadoop configuration files indicate to use kerberos (e.g.
hadoop.security.authentication), we'll use the supplied principal/keytab from
the processor and krb5 file from the global properties. A processor exception
will be thrown if one of them is missing.
> Kerberos support for Hadoop processors
> ---------------------------------------
>
> Key: NIFI-866
> URL: https://issues.apache.org/jira/browse/NIFI-866
> Project: Apache NiFi
> Issue Type: New Feature
> Components: Extensions
> Reporter: Ricky Saltzer
> Assignee: Ricky Saltzer
> Attachments: NIFI-866.patch
>
>
> Currently the AbstractHadoopProcessor only supports talking to non-kerberos
> Hadoop clusters. Even though the user might be supplying a Hadoop
> configuration which indicates the authentication implementation is Kerberos,
> NiFi will still attempt to connect via SIMPLE authentication. This results in
> a processor exception.
> *Goals:*
> * Minimal configuration for Kerberos support
> * Shouldn't have to configure individual processors (e.g. user could have
> tens to hundreds of these processors)
> *Non-Goals:*
> * Support more than one kerberos principal at a time
> * Support both secure and non-secure connections at the same time
> *Basic Usage Proposal:*
> Edit _conf/nifi.properties_ and modify the following values
> {code:title=nifi.properties|borderStyle=solid}
> ..
> # kerberos #
> nifi.kerberos.enabled=true
> nifi.kerberos.krb5.file=/path/to/krb5.conf
> nifi.kerberos.keytab=/path/to/user.keytab
> nifi.kerberos.principal=user@REALM
> {code}
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