Add config and more tests

Signed-off-by: Shivshankar-Reddy <[email protected]>

tests/unit/admin-port.tcl

@@ -16,6 +16,13 @@ tags {external:skip tls:skip} {
         }
     }
 
+    test {admin-port: setting admin-port to server port should fail} {
+        start_server {} {
+            catch {r CONFIG SET port [srv 0 admin-port]} e
+            assert_match {*Unable to listen on this port*} $e
+        }
+    }
+
     test {admin-port: client could connect on admin-port after maxclients reached} {
         start_server {} {
             set original_maxclients [lindex [r config get maxclients] 1]

valkey.conf

@@ -138,6 +138,15 @@ protected-mode yes
 # If port 0 is specified the server will not listen on a TCP socket.
 port 6379
 
+# admin-port
+#
+# Accept connections on the specified port and connections should be originating from
+# local loopback (127.0.0.1), unix domain socket or IPv6 address (::1).
+# Default is 0 and immutable.
+# If admin-port is not specified the server will not listen on a TCP socket.
+#
+# admin-port 0
+
 # TCP listen() backlog.
 #
 # In high requests-per-second environments you need a high backlog in order