無法連接到來自另一個容器的mongodb泊塢窗容器

Question

我有以下簡化設計：一個mongodb容器和一個「python-client」泊塢窗容器，鏈接到前者。這是我簡單的docker-compose.yml文件：

mongodb: 
    build: "mongodb" 
    dockerfile: "Dockerfile" 
    hostname: "mongodb.local" 
    ports: 
    - "27017:27017" 

client: 
    build: "client" 
    dockerfile: "Dockerfile" 
    hostname: "client.local" 
    links: 
    - "mongodb:mongodb" 
    environment: 
    - "MONGODB_URL=mongodb://admin:admin@mongodb:27017/admin" 
    - "MONGODB_DB=historictraffic" 

我能夠建立使用pymongo從使用mongodb://admin:admin@localhost:27017/admin連接字符串我的主機連接成功（注意localhost）：

$ ipython 
from pymongo import MongoClient 
mongo = MongoClient('mongodb://admin:admin@localhost:27017/admin') 
db = mongo.test 
col = db.test 
col.insert_one({'x': 1}) 
# This works 

但我做不到不從客戶端容器連接。顯然，鏈接是正確的：

/# cat /etc/hosts 
172.17.0.27  client.local client 
127.0.0.1  localhost 
::1  localhost ip6-localhost ip6-loopback 
fe00::0 ip6-localnet 
ff00::0 ip6-mcastprefix 
ff02::1 ip6-allnodes 
ff02::2 ip6-allrouters 
172.17.0.26  historictraffic_mongodb_1 mongodb 
172.17.0.26  mongodb mongodb historictraffic_mongodb_1 
172.17.0.26  mongodb_1 mongodb historictraffic_mongodb_1 

但是，當我做同樣的測試，它失敗：

/ # ipython 
from pymongo import MongoClient 
mongo = MongoClient('mongodb://admin:admin@mongodb:27017/admin') 
db = mongo.test 
col = db.test 
col.insert_one({'x': 2}) 
--------------------------------------------------------------------------- 
ServerSelectionTimeoutError    Traceback (most recent call last) 
<ipython-input-5-c5d62e5590d5> in <module>() 
----> 1 col.insert_one({'x': 2}) 

/usr/lib/python2.7/site-packages/pymongo/collection.pyc in insert_one(self, document) 
    464   if "_id" not in document: 
    465    document["_id"] = ObjectId() 
--> 466   with self._socket_for_writes() as sock_info: 
    467    return InsertOneResult(self._insert(sock_info, document), 
    468         self.write_concern.acknowledged) 

/usr/lib/python2.7/contextlib.pyc in __enter__(self) 
    15  def __enter__(self): 
    16   try: 
---> 17    return self.gen.next() 
    18   except StopIteration: 
    19    raise RuntimeError("generator didn't yield") 

/usr/lib/python2.7/site-packages/pymongo/mongo_client.pyc in _get_socket(self, selector) 
    661  @contextlib.contextmanager 
    662  def _get_socket(self, selector): 
--> 663   server = self._get_topology().select_server(selector) 
    664   try: 
    665    with server.get_socket(self.__all_credentials) as sock_info: 

/usr/lib/python2.7/site-packages/pymongo/topology.pyc in select_server(self, selector, server_selection_timeout, address) 
    119   return random.choice(self.select_servers(selector, 
    120             server_selection_timeout, 
--> 121             address)) 
    122 
    123  def select_server_by_address(self, address, 

/usr/lib/python2.7/site-packages/pymongo/topology.pyc in select_servers(self, selector, server_selection_timeout, address) 
    95     if server_timeout == 0 or now > end_time: 
    96      raise ServerSelectionTimeoutError(
---> 97       self._error_message(selector)) 
    98 
    99     self._ensure_opened() 

ServerSelectionTimeoutError: mongodb:27017: [Errno 113] Host is unreachable 

有誰知道如何解決呢？謝謝。

Answer 1

這種失敗可能是因爲mongo還沒有啓動。您可以在重試之間以短暫的延遲重試連接，並且在一次或兩次嘗試後它應該可以工作。