fix `get_ip` error in pure ipv6 environment (#2931)

vllm/utils.py

@@ -162,8 +162,15 @@ def make_async(func: Callable[..., T]) -> Callable[..., Awaitable[T]]:
 
 
 def get_ip() -> str:
+    # try ipv4
     s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
-    s.connect(("8.8.8.8", 80))  # Doesn't need to be reachable
+    try:
+        s.connect(("dns.google", 80))  # Doesn't need to be reachable
+        return s.getsockname()[0]
+    except OSError:
+        # try ipv6
+        s = socket.socket(socket.AF_INET6, socket.SOCK_DGRAM)
+        s.connect(("dns.google", 80))
         return s.getsockname()[0]
 
 
@@ -172,9 +179,16 @@ def get_distributed_init_method(ip: str, port: int) -> str:
 
 
 def get_open_port() -> int:
+    # try ipv4
+    try:
         with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
             s.bind(("", 0))
             return s.getsockname()[1]
+    except OSError:
+        # try ipv6
+        with socket.socket(socket.AF_INET6, socket.SOCK_STREAM) as s:
+            s.bind(("", 0))
+            return s.getsockname()[1]
 
 
 def set_cuda_visible_devices(device_ids: List[int]) -> None: