-# Arvados REQUIRES valid SSL to work correctly. Otherwise, some components will fail
-# to communicate and can silently drop traffic. You can try to use the Letsencrypt
-# salt formula (https://github.com/saltstack-formulas/letsencrypt-formula) to try to
-# automatically obtain and install SSL certificates for your instances or set this
-# variable to "no", provide and upload your own certificates to the instances and
-# modify the 'nginx_*' salt pillars accordingly
-USE_LETSENCRYPT="no"
+# Arvados requires SSL certificates to work correctly. This installer supports these options:
+# * self-signed: let the installer create self-signed certificate(s)
+# * bring-your-own: supply your own certificate(s) in the `certs` directory
+#
+# See https://doc.arvados.org/intall/salt-single-host.html#certificates for more information.
+SSL_MODE="self-signed"
+
+# If you want to use letsencrypt, set SSL_MODE="lets-encrypt"
+# A single certificate for the external hostname of the host will be retrieved, using
+# "standalone" mode of LE.