Configure for Kerberos Integration

This document describes how to set up a Alteryx user in Kerberos.

Kerberos provides authentication services across a wide variety of platforms. See http://www.kerberos.org/.

Prerequisites for Kerberos integration

Before you begin, please verify the following:

The [hadoop.user (default=trifacta)] user is created and enabled on each node in the Hadoop cluster.
Note
If LDAP is enabled, the trifacta user should be created in the same realm as the cluster.
On the Alteryx host, the directory /opt/trifactais owned by the [hadoop.user] user.
The [hadoop.user] user exists on each node in the Hadoop cluster.
Note
The [hadoop.user] must have the same user ID and group ID on each node in the cluster. Depending on your cluster's configuration, this requirement may require an LDAP command. Configuring LDAP is beyond the scope of this document.
The [hadoop.user] user must be a member of any special group that is permitted to access HDFS or to run Hadoop jobs.

Configure the KDC

Steps:

On your KDC node, configure a Kerberos principal for the Designer Cloud Powered by Trifacta platform:
1. The principal's identifier has two parts: its name and its realm. For example, the principal trifacta@HADOOPVAL.MSSVC.LOCAL has the name trifacta and the realm HADOOPVAL.MSSVC.LOCAL.
2. Retain the name and principal for later configuration.
Create a keytab file for the Alteryx principal. Command:
```
kadmin xst -k trifacta.keytab <full principal identifier>
```
where:
<full_principal_identifier> is the principal identifier in Kerberos.
Warning
On the KDC, you may have to run kadmin.local instead of kadmin. The rest of the arguments should remain the same.
Note
If you're creating a keytab file in an AD environment, alternative instructions may need to be applied. See below.
Verify that the keytab is working. Command:
```
klist -e -k -t trifacta.keytab
```
Copy the keytab to the Trifacta node in the following directory:
/opt/trifacta/conf/trifacta.keytab
Configure the keytab file so that it is owned by the [hadoop.user] user. It should only be readable by that user.
Note
Verify that all user principals that use the platform are also members of the group of the keytab user.

Create keytab in Active Directory environments

Some additional instructions are provided for the following environments.

For MIT Kerberos

Seehttps://kb.iu.edu/d/aumh:

> ktutil
  ktutil:  addent -password -p username@EXAMPLE.COM -k 1 -e rc4-hmac
  Password for username@EXAMPLE.COM: [enter your password]
  ktutil:  addent -password -p username@EXAMPLE.COM -k 1 -e aes256-cts
  Password for username@EXAMPLE.COM: [enter your password]
  ktutil:  wkt username.keytab
  ktutil:  quit

For Heimdal Kerberos

  > ktutil -k username.keytab add -p username@EXAMPLE.COM -e arcfour-hmac-md5 -V 1

If the keytab created in Heimdal does not work, you may need an aes256-cts entry. In this case, locate a machine with MIT Kerberos, and use the MIT Kerberos method instead.

Configure the Designer Cloud Powered by Trifacta platform for Kerberos

You can apply this change through the Admin Settings Page (recommended) or trifacta-conf.json. For more information, see Platform Configuration Methods.

Locate the kerberos section, which controls Kerberos authentication.

Example configuration:

Substitute your own values in place of the example values as appropriate.

"kerberos.enabled": true,
"kerberos.principal": "trifacta",
"kerberos.kdc": "kdc.mssvc.local",
"kerberos.realm": "HADOOPVAL.MSSVC.LOCAL",
"kerberos.keytab": "/opt/trifacta/conf/trifacta.keytab"
"kerberos.principals.hive": "<UNUSED>",
"kerberos.principals.namenode": "nn/_HOST@EXAMPLE.COM"
"kerberos.principals.resourcemanager": "<YOUR_VALUE_HERE>",

Parameter	Description
enabled	To enable Kerberos authentication, set this value to `true`.
principal	The name part of the principal you created in the KDC
kdc	The host of the KDC
realm	Realm of the KDC
keytab	Directory in the Alteryx deployment where the Kerberos keytab file is stored
principals	List of jobtrackers and namenodes that are governed by Kerberos Note `kerberos.principals.hive` is unused. This value must be inserted into the Hive connection definition. See Hive Connections. Note If you don't know the values to use here, see Set principal values below. Note If you don't specify principal names in the `principals` definition section, the default names are used: `mapred/<jobtracker host>@<realm>`. You should specify the principals explicitly.

At this point, you should be able to load files from HDFS and run jobs against the kerberized Hadoop cluster.

Set principal values for YARN

Check the following Hadoop config properties in yarn-site.xml:

principals.jobtracker = yarn.resourcemanager.principal
principals.namenode = dfs.namenode.kerberos.principal

Configure Kerberos-delegated relational connections

When Kerberos has been enabled in the platform, you can apply the global keytab to be used for SSO connections to relational sources of data. For more information, see Enable SSO for Relational Connections.

In this section: