我正在尝试按照此处https://channels.readthedocs.io/en/latest/tutorial/part_2.html的教程进行操作, 并检查通道层是否可以与Redis通信。我正在做的唯一不同的事情是我正在使用docker-compose并在docker容器上运行整个事情,这似乎使所有事情搞砸了。这是我尝试执行时收到的错误消息
run async_to_sync(channel_layer.send)('test_channel', {'type': 'hello'})
Traceback (most recent call last):
File "<console>", line 1, in <module>
File "/usr/local/lib/python3.7/site-packages/asgiref/sync.py", line 116, in __call__
return call_result.result()
File "/usr/local/lib/python3.7/concurrent/futures/_base.py", line 428, in result
return self.__get_result()
File "/usr/local/lib/python3.7/concurrent/futures/_base.py", line 384, in __get_result
raise self._exception
File "/usr/local/lib/python3.7/site-packages/asgiref/sync.py", line 156, in main_wrap
result = await self.awaitable(*args, **kwargs)
File "/usr/local/lib/python3.7/site-packages/channels_redis/core.py", line 293, in send
async with self.connection(index) as connection:
File "/usr/local/lib/python3.7/site-packages/channels_redis/core.py", line 820, in __aenter__
self.conn = await self.pool.pop()
File "/usr/local/lib/python3.7/site-packages/channels_redis/core.py", line 70, in pop
conns.append(await aioredis.create_redis(**self.host, loop=loop))
File "/usr/local/lib/python3.7/site-packages/aioredis/commands/__init__.py", line 175, in create_redis
loop=loop)
File "/usr/local/lib/python3.7/site-packages/aioredis/connection.py", line 113, in create_connection
timeout)
File "/usr/local/lib/python3.7/asyncio/tasks.py", line 414, in wait_for
return await fut
File "/usr/local/lib/python3.7/site-packages/aioredis/stream.py", line 24, in open_connection
lambda: protocol, host, port, **kwds)
File "/usr/local/lib/python3.7/asyncio/base_events.py", line 958, in create_connection
raise exceptions[0]
File "/usr/local/lib/python3.7/asyncio/base_events.py", line 945, in create_connection
await self.sock_connect(sock, address)
File "/usr/local/lib/python3.7/asyncio/selector_events.py", line 473, in sock_connect
return await fut
File "/usr/local/lib/python3.7/asyncio/selector_events.py", line 503, in _sock_connect_cb
raise OSError(err, f'Connect call failed {address}')
ConnectionRefusedError: [Errno 111] Connect call failed ('127.0.0.1', 6379)
我检查了一些帖子,发现很多建议是因为Redis没有运行。我知道Redis存在,因为docker ps显示
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
2ccab2cfc570 test_web "python manage.py ru…" 7 minutes ago Up 7 minutes 0.0.0.0:8000->8000/tcp test_web_1
6da398f093fc redis:2.8 "docker-entrypoint.s…" 10 minutes ago Up 10 minutes 0.0.0.0:6379->6379/tcp relaxed_aryabhata
知道我现在能做什么吗?我真的很新
尝试更改127.0.0.1:6379
为redis:6379
。
尽管Redis正在运行,但是你的python
容器无法与之通信;这是因为它正在尝试连接127.0.0.1:6379
,但是从容器的角度来看,那里没有任何运行。调试可能会让人感到沮丧,但是如果你要记住容器具有其自己的网络名称空间,则会稍微容易一些。结果,python
localhost!=redis
的localhost!=你的主机的localhost
。
幸运的是,连接共享同一网桥的容器很容易,并且默认情况下,docker-compose
会创建一个网桥网络并将所有容器连接到它们,并提供必要的DNS以使它们彼此发现。结果,容器到容器的通信仅通过使用服务名称即可进行。
请注意,可以通过--net=container:<container-id>
or--net=host
标志在相同的名称空间中运行容器,并在主机的名称空间中运行它们。这对于在容器中运行调试工具并将其附加到另一个容器或主机的网络名称空间特别有用,例如,使用netshoot来查看容器中正在侦听的端口(已暴露或未暴露)docker run --rm -it --net container:test_web_1 nicolaka/netshoot netstat -tulpn
。
嗨,我有一个问题,我到底需要在哪里将127更改为redis?好像我更改了以下内容:'CONFIG':{“ hosts”:[('127.0.0.1',6379)],},然后出现socket.gaierror:[Errno -3]名称解析暂时失败
@MareksNo由于DNS失败,您使用的名称可能与服务的名称不同。
docker network ls
显示当前网络并docker network inspect <name>
显示附加容器的名称。为了使DNS以您期望的方式工作,两种服务都应位于同一网络中,并按名称进行引用。还有其他网络细节,但这是使用Docker处理它的常用方法。