How to disable LDAP Authentication in Linux

After a customer had performed some bad edits on various LDAP configuration files, users were locked out and unable to access the system. Root could still login however.

I logged in as root, and rather than mess with various config files, eg under /etc/pam.d, ran this command to disable LDAP authentication and enable “normal” authentication using /etc/shadow:

# authconfig --disableldapauth --disableldap --enableshadow --updateall

After which users could login again.

Footnote

This was a “lab” system located on an isolated network. On a production server, having direct root login is not recommended, and great care should be exercised before using the authconfig command.

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