Github user dyozie commented on a diff in the pull request:
https://github.com/apache/incubator-hawq-docs/pull/132#discussion_r147238502
--- Diff: markdown/clientaccess/kerberos-userauth.html.md.erb ---
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+---
+title: Configuring Kerberos User Authentication for HAWQ
+---
+
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+
+When Kerberos authentication is enabled at the user level, HAWQ uses the
Generic Security Service Application Program Interface \(GSSAPI\) to provide
automatic authentication \(single sign-on\). When HAWQ uses Kerberos user
authentication, HAWQ itself and the HAWQ users \(roles\) that require Kerberos
authentication require a principal and keytab. When a user attempts to log in
to HAWQ, HAWQ uses its Kerberos principal to connect to the Kerberos server,
and presents the user's principal for Kerberos validation. If the user
principal is valid, login succeeds and the user can access HAWQ. Conversely,
the login fails and HAWQ denies access to the user if the principal is not
valid.
+
+When HAWQ utilizes Kerberos for user authentication, it uses a standard
principal to connect to the Kerberos KDC. The format of this principal is
`postgres/<FQDN_of_master>@<realm>`, where \<FQDN\_of\_master\> refers to the
fully qualified distinguish name of the HAWQ master node.
--- End diff --
"When HAWQ utilizes Kerberos for user authentication, it uses a single HAWQ
server principal to connect to the Kerberos KDC. The format of the HAWQ server
principal is ..."
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