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7.2.6 PAM authentication

This authentication method operates similarly to password except that it uses PAM (Pluggable Authentication Modules) as the authentication mechanism. The default PAM service name is postgresql. You can optionally supply your own service name after the pam key word in the file ‘pg_hba.conf’. PAM is used only to validate user name/password pairs. Therefore the user must already exist in the database before PAM can be used for authentication. For more information about PAM, please read the Linux-PAM Page and the Solaris PAM Page.