doc/cephadm/rgw: add note about which ethernet interface is used

Signed-off-by: Sage Weil <sage@newdream.net>

diff --git a/doc/cephadm/rgw.rst b/doc/cephadm/rgw.rst
index 0593a1334452c850c446d5969ba1b9dc1bad09ce..02317f5bee8f2767ab6e089cab67487cfa58b509 100644 (file)
--- a/doc/cephadm/rgw.rst
+++ b/doc/cephadm/rgw.rst
@@ -112,6 +112,10 @@ elected as master, and the virtual IP will be moved to that node.
 The active haproxy acts like a load balancer, distributing all RGW requests
 between all the RGW daemons available.
 
+.. note:: The virtual IP will be configured on an ethernet interface on the host
+         that has an existing IP in the same subnet.  (If there are multiple such
+         interfaces, cephadm will choose the "first" one it sees.)
+
 **Prerequisites:**
 
 * An existing RGW service, without SSL.  (If you want SSL service, the certificate