[Minor fix] The domain dns.google may cause a socket.gaierror exception

[ttbachyinsda]

May Fix #3170

In specific network environments, the following code may throw a socket.gaierror exception because the domain dns.google cannot be resolved correctly to an IP address. The issue can be solved by directly using 8.8.8.8, even if 8.8.8.8:80 is not accessible.

def get_ip() -> str:
    # try ipv4
    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    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]

File "/usr/local/lib/python3.10/dist-packages/vllm/entrypoints/llm.py", line 109, in init
self.llm_engine = LLMEngine.from_engine_args(engine_args)
File "/usr/local/lib/python3.10/dist-packages/vllm/engine/llm_engine.py", line 391, in from_engine_args
engine = cls(*engine_configs,
File "/usr/local/lib/python3.10/dist-packages/vllm/engine/llm_engine.py", line 128, in init
self._init_workers()
File "/usr/local/lib/python3.10/dist-packages/vllm/engine/llm_engine.py", line 167, in _init_workers
get_ip(), get_open_port())
File "/usr/local/lib/python3.10/dist-packages/vllm/utils.py", line 181, in get_ip
s.connect(("dns.google", 80))
socket.gaierror: [Errno -2] Name or service not known

[payoto]

Similar to #2961 either of these can be merged