CODEWITHSUNDEEP
pythonmongodbpymongo
VRComp
VRComp

Reputation: 131

Multiple Connections to MongoDB Instance using Pymongo

I am fairly new to MongoDB, and I wondering how can I establish multiple connections to a single Mongo instance without specifying ports or making a new config file for each user. I am running the Mongo instance in a singularity container on a remote server.

Here is my sample config file:

# mongod.conf

# for documentation of all options, see:
#  https://docs.mongodb.com/manual/reference/configuration-options/

# where to write logging data for debugging and such.
systemLog:
  destination: file
  logAppend: true
  path: /path-to-log/

# network interfaces
net:
  port: 27017
  bindIp: 127.0.0.1
  maxIncomingConnections: 65536

#security
security:
  authorization: 'enabled'

Do I need to use replica set? If so, can someone explain the concept behind a replica set?

Do I need to change my config file? If so, what changes do I need to make to allow for multiple connections?

Here is my code that I use to connect to the server (leaving out import statements for clarity):

    PWD = "/path-to-singularity-container/"
    os.chdir(PWD)
    self.p = subprocess.Popen(f"singularity run --bind {PWD}/data:/data/db mongo.sif --auth --config {PWD}/mongod.conf", shell=True, preexec_fn=os.setpgrp)

    connection_string = "mongodb://user:[email protected]:27017/"
    client = pymongo.MongoClient(connection_string, serverSelectionTimeoutMS=60_000)

EDIT: I am trying to have multiple people connect to MongoDB using pymongo at the same time given the same connection string. I am not sure how I can achieve this without giving each user a separate config. file.

Thank you for your help!

Upvotes: 0

Views: 1746

Answers (2)

ROHIT KHURANA
ROHIT KHURANA

Reputation: 983

you can enough value of ulimit. Mongod tracks each incoming connection with a file descriptor and a thread.

you can go through the below link which will explain each component of ulimit parameters and their values.

https://docs.mongodb.com/manual/reference/ulimit/

For HA solutions, if you don't want downtime in your environment then you need to go with HA solution which means 3 nodes replica set which can afford one node down at a time.

If the primary node goes down, there will be internal voting and the new node will promote as new primary within seconds. So your application will be less impacted. Another benefit, if your node got crashed, you have another copy of data.

Hope this will answer your question.

Upvotes: 1

D. SM
D. SM

Reputation: 14490

No special work is required, you simply create a client and execute queries.

Upvotes: 0

Related Questions