PAM Authentication Error: User not known to the underlying authentication module

SUMMARY

Oracle backup fails

ISSUE

Oracle DB fails with error, PAM Authentication Error: User not known to the underlying authentication module.

RESOLUTION

On the Linux box you should be able to run:

cat /etc/oratab

This will give you a list of databases deployed on the current system. It will be a : separated list of sid:home:boot. For each unique home path you should run the following:

export ORACLE_HOME=home
${ORACLE_HOME}/bin/osdbagrp

This will give you the oradba system group used to manage the Oracle Instance. Using this group run:

lid -g group

That command should give you a list of users that could be used as system level oracle dbas for that unique home.

CAUSE

The Oracle backup needs to have a user that is known by the Linux OS and the Oracle DB.  A good choice is the user that was used while installing the Oracle instance.

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