Question

我已将mongodb作为StatefulSets部署在K8S上。当我尝试使用连接字符串URI（例如：mongodb：//mongo-0.mongo：27017，mongo-1.mongo：27017 / cool_db）连接数据库时，它没有连接，但它正在连接并获取结果当我使用端点IP地址时。

# kubectl get sts
NAME    READY   AGE
mongo   2/2     7h33m

#kubectl get pods
NAME                                      READY   STATUS    RESTARTS   AGE
mongo-0                                   2/2     Running   0          7h48m
mongo-1                                   2/2     Running   2          7h47m

# kubectl get svc
NAME         TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)     AGE
kubernetes   ClusterIP   10.96.0.1    <none>        443/TCP     10h
mongo        ClusterIP   None         <none>        27017/TCP   7h48m

我正在尝试使用以下过程在python中使用连接字符串URI测试连接，但失败。

>>> import pymongo
>>> client = pymongo.MongoClient("mongodb://mongo-0.mongo:27017,mongo-1.mongo:27017/cool_db")
>>> db = client.cool_db
>>> print db.cool_collection.count()
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "/usr/lib64/python2.7/site-packages/pymongo/collection.py", line 1800, in count
   return self._count(cmd, collation, session)
 File "/usr/lib64/python2.7/site-packages/pymongo/collection.py", line 1600, in _count
   _cmd, self._read_preference_for(session), session)
 File "/usr/lib64/python2.7/site-packages/pymongo/mongo_client.py", line 1454, in _retryable_read
   read_pref, session, address=address)
 File "/usr/lib64/python2.7/site-packages/pymongo/mongo_client.py", line 1253, in _select_server
   server = topology.select_server(server_selector)
 File "/usr/lib64/python2.7/site-packages/pymongo/topology.py", line 235, in select_server
   address))
 File "/usr/lib64/python2.7/site-packages/pymongo/topology.py", line 193, in select_servers
   selector, server_timeout, address)
 File "/usr/lib64/python2.7/site-packages/pymongo/topology.py", line 209, in _select_servers_loop
   self._error_message(selector))
pymongo.errors.ServerSelectionTimeoutError: mongo-0.mongo:27017: [Errno -2] Name or service not known,mongo-1.mongo:27017: [Errno -2] Name or service not known

如果我们使用端点IP地址，那么我们将从DB获得响应。

>>> import pymongo
>>> client = pymongo.MongoClient("mongodb://10.244.1.8,10.244.2.9:27017/cool_db")
>>> db = client.cool_db
>>> print db.cool_collection.count()
0
>>>

我尝试使用其他URI，例如（client = pymongo.MongoClient（“ mongodb：//mongo-0.mongo：27017 / cool_db”）），但无法正常工作。谁能帮我吗？

Answer 1

来自my previous similar answer：

在集群中，您应该使用<service-name>.<namespace-name>.svc.cluster.local引用MongoDB Pod。

Answer 2

我认为使用mongodb://mongo-0:27017应该可以

Answer 3

刚刚调试此问题。确保您的迷你库正在使用coredns。我的不是，一旦我进行了minikube删除和minikube启动，一切正常。

您需要查看此

$ kubectl get deploy -n kube-system
NAME      READY   UP-TO-DATE   AVAILABLE   AGE
coredns   1/1     1            1           31s

或这个

$ kubectl get po -n kube-system
NAME                               READY   STATUS    RESTARTS   AGE
coredns-66bff467f8-9h6qb           1/1     Running   0          46s
etcd-minikube                      1/1     Running   0          46s
kube-apiserver-minikube            1/1     Running   0          46s
kube-controller-manager-minikube   1/1     Running   0          45s
kube-proxy-d99lp                   1/1     Running   0          46s
kube-scheduler-minikube            1/1     Running   0          46s
storage-provisioner                1/1     Running   0          49s

mongodb连接字符串uri在Kubernetes中不起作用

3 个答案: