+
+It's possible to enable SASL authentication as documented here:
+ http://php.net/manual/en/memcached.setsaslauthdata.php
+ https://code.google.com/p/memcached/wiki/SASLHowto
+
+SASL authentication requires a memcached server with SASL support (version 1.4.3
+or greater built with --enable-sasl and started with the -S flag) and the PECL
+memcached client version 2.0.0 or greater also built with SASL support. Once
+these requirements are satisfied you can then enable SASL support in the Drupal
+memcache module by enabling the binary protocol and setting
+memcache_sasl_username and memcache_sasl_password in settings.php. For example:
+
+$settings['memcache']['sasl'] = [
+ 'username' => 'user',
+ 'password' => 'password',
+];
+
+// When using SASL, Memcached extension needs to be used
+// because Memcache extension doesn't support it.
+$settings['memcache']['extension'] = 'Memcached';
+$settings['memcache']['options'] = [
+ \Memcached::OPT_BINARY_PROTOCOL => TRUE,
+];