Unable to connect to hidden secondary

Ops and Admin Replication
,
#1

hi!

i have replica set with 3 secondary in one VPC1 and 4-th secondary hidden member in another VPC2 in subnet1. There is a peering connection between vpc`s (only for vpc2 subnet1)
Connection to hidden from VPC2 subnet1 establish fine.

But if i try connection from vpc2 subnet2 to hidden member (for vpc2 subnet2 visible only vpc2 subnet1) catch error:

 File "/home/ubuntu/.local/lib/python3.6/site-packages/pymongo/topology.py", line 201, in select_servers
    selector, server_timeout, address)
  File "/home/ubuntu/.local/lib/python3.6/site-packages/pymongo/topology.py", line 218, in _select_servers_loop
    (self._error_message(selector), timeout, self.description))
pymongo.errors.ServerSelectionTimeoutError: No replica set members match selector "Primary()", Timeout: 3.0s, Topology Description: <TopologyDescription id: 6205bf04e1315e98211bed68, topology_type: ReplicaSetNoPrimary, servers: [

try connection strings:

mongodb://user:password@192.168.0.1:27017/?authSource=db&readPreference=secondary
mongodb://user:password@192.168.0.1:27017/?authSource=db&replicaSet=rs&readPreference=secondary

is it capable connect to hidden if primary is invisible for client?

#2

Welcome to the MongoDB Community Forums @Georgiy!

Clients will not distribute queries to hidden secondaries using read preferences: you need to use a direct (or “standalone”) connection to the hidden secondary.

A direct connection string will not include the replicaSet or readPreference options, and the client will not perform discovery or failover based on the current replica set configuration. PyMongo 3.11+ additionally requires the directConnection option to be True.

Assuming 192.168.0.1 is the hidden secondary, try the following connection string in PyMongo:

mongodb://user:password@192.168.0.1:27017/?authSource=db&directConnection=True

Regards,
Stennie

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#3

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