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add doc for new flag experimental-keystone-ca-file #1620

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7 changes: 7 additions & 0 deletions docs/admin/authentication.md
Original file line number Diff line number Diff line change
Expand Up @@ -367,6 +367,13 @@ option to the API server during startup. The plugin is implemented in
`plugin/pkg/auth/authenticator/password/keystone/keystone.go` and currently uses
basic auth to verify used by username and password.

If you have configured self-signed certificates for the Keystone server,
you may need to set the `--experimental-keystone-ca-file=SOMEFILE` option when
starting the Kubernetes API server. If you set the option, the Keystone
server's certificate is verified by one of the authorities in the
`experimental-keystone-ca-file`. Otherwise, the certificate is verified by
the host's root Certificate Authority.

For details on how to use keystone to manage projects and users, refer to the
[Keystone documentation](http://docs.openstack.org/developer/keystone/). Please
note that this plugin is still experimental, under active development, and likely
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