rgw: add rgw_resolve_endpoints_into_all_addresses config option

Introduce an advanced boolean config option (default: false) to enable resolving
multisite endpoint hostnames into all A/AAAA records.

When enabled, RGW can distribute outgoing inter-zone traffic across DNS-provided
backends even without an external load balancer.

Signed-off-by: Oguzhan Ozmen <oozmen@bloomberg.net>

diff --git a/src/common/options/rgw.yaml.in b/src/common/options/rgw.yaml.in
index 6e50726457d914f788fc76f6cf2d81fb66cca08d..2d1c4cb777f9fe76250b76cb0fc75bb0a460b1f3 100644 (file)
--- a/src/common/options/rgw.yaml.in
+++ b/src/common/options/rgw.yaml.in
@@ -2065,6 +2065,22 @@ options:
   services:
   - rgw
   with_legacy: true
+- name: rgw_rest_conn_connect_to_resolved_ips
+  type: bool
+  level: advanced
+  long_desc: When an RGW endpoint hostname resolves to multiple A or AAAA
+    records, libcurl normally connects to only the first address returned by
+    DNS. Enabling this option causes RGW to resolve each configured endpoint
+    into all of its addresses and distribute outgoing requests across them
+    using round-robin, with per-IP health tracking. This applies to
+    multisite replication traffic between zones (via RGWRESTConn). For example, in a
+    multisite deployment where zone endpoints such as "https://zone-a.example.com"
+    map to several backend RGW nodes, this allows inter-zone traffic to be spread
+    across all peers without requiring an external load balancer.
+  default: false
+  services:
+  - rgw
+  with_legacy: true
 - name: rgw_obj_stripe_size
   type: size
   level: advanced