Cluster nodes by name instead of (mutable) ip.

scripts/common.sh

@@ -103,13 +103,19 @@ prompt_with_default() {
         if [ -z "${result}" ]; then
             result="${current_value}"
         fi
-    elif [ -n "${default}" ]; then
-        printf "%s [default: %s]: " "${prompt}" "${default}" >&2
+    elif [ $# -ge 2 ]; then
+        # Default was provided (even if empty)
+        if [ -n "${default}" ]; then
+            printf "%s [default: %s]: " "${prompt}" "${default}" >&2
+        else
+            printf "%s [default: empty]: " "${prompt}" >&2
+        fi
         read -r result
         if [ -z "${result}" ]; then
             result="${default}"
         fi
     else
+        # No default provided - value is required
         printf "%s: " "${prompt}" >&2
         read -r result
         while [ -z "${result}" ]; do