This blog post by Roi Katz provides a detailed guide for setting up LDAP authentication for Couchbase using Active Directory on a Linux environment, specifically for version 4.1. The instructions cover installing the necessary software, configuring saslauthd, and adjusting permissions to ensure Couchbase can authenticate users via LDAP. Katz outlines the process of configuring the LDAP settings, including specifying the LDAP server, search base, and admin credentials. The guide also emphasizes testing the connection with tools like JXplorer and ensuring that Active Directory ports are open. The article concludes with steps to enable LDAP authentication in the Couchbase console and offers a brief note on an upcoming update for version 5, where the process has changed, suggesting using the couchbase-cli for LDAP settings in the absence of the "LDAP Auth Setup" tab.