In order to communicate with MongoDB from Flask, I use the following code to define the connection :
CLIENT = pymongo.MongoClient('mongodb://localhost:27017/')
Everything works fine but once I'm trying to deploy my application on Docker I get the following error:
pymongo.errors.ServerSelectionTimeoutError: localhost:27017: [Errno 111] Connection refused
To solve this problem, I can replace the previous code by:
import os
client = MongoClient(os.environ['DB_PORT_27017_TCP_ADDR'],27017)
But then it only works on Docker and not on my local machine.
How can I define the connection in order to make it work on both Docker and my local machine ?
You can specify that if DB_PORT_27017_TCP_ADDR environment variable is present, use that; else use localhost using something like this:
import os
client = MongoClient(os.environ.get('DB_PORT_27017_TCP_ADDR') or 'localhost', 27017)
Related
The Problem
I'm getting started with MongoDB on Python, I have a Ubuntu machine in my local network and MongoDB is installed there. When I try to connect with database using Python from Mac it throughs me an error. I searched about it and found out there is a .service called mongod.service that needs to be started along with mongodb.service. But when I try to start the mongod.service the it says the .service doesn't even exist. I tried both with IP and mongodb url, nothing works.
Ubuntu Terminal
$ sudo service mongod start
$ Failed to start mongod.service: Unit mongod.service not found.
$ sudo systemctl start mongod
$ Failed to start mongod.service: Unit mongod.service not found.
DataBase Link (a)
mongodb://user:password#192.168.0.106/database
Python Script (a)
#!/usr/bin/env python3
from pymongo import MongoClient
client = MongoClient('mongodb://user:password#192.168.0.106/database')
db = client['database']
collection = db['collection']
json = dict(message='hello world', token=0)
collection.insert_one(json)
macOS Terminal (a)
pymongo.errors.ServerSelectionTimeoutError: 192.168.0.106:27017: [Errno 61] Connection refused, Timeout: 30s, Topology Description: <TopologyDescription id: 60e140982a43032aef0dd634, topology_type: Single, servers: [<ServerDescription ('192.168.0.106', 27017) server_type: Unknown, rtt: None, error=AutoReconnect('192.168.0.106:27017: [Errno 61] Connection refused')>]>
DataBase Link (b)
mongodb+srv://user:password#cluster0.h9fmz.mongodb.net/database?retryWrites=true&w=majority
Python Script (b)
#!/usr/bin/env python3
from pymongo import MongoClient
client = MongoClient('mongodb+srv://user:password#cluster0.h9fmz.mongodb.net/database?retryWrites=true&w=majority')
db = client['database']
collection = db['collection']
json = dict(message='hello world', token=0)
collection.insert_one(json)
macOS Terminal (b)
Traceback (most recent call last):
File "/usr/local/lib/python3.9/site-packages/pymongo/pool.py", line 1278, in _get_socket
sock_info = self.sockets.popleft()
IndexError: pop from an empty deque
During handling of the above exception, another exception occurred:
.....
.....
.....
pymongo.errors.OperationFailure: bad auth : Authentication failed., full error: {'ok': 0, 'errmsg': 'bad auth : Authentication failed.', 'code': 8000, 'codeName': 'AtlasError'}
Note That
I'm providing the correct username and password for the database.
I'm using a machine on my local network, which is not a live server.
I've also tried the following commands but they did not solve anything.
Ubuntu Terminal
$ mongod --auth --port 27017
$ mongod --port 27017
$ sudo rm /var/lib/mongodb/mongod.lock
$ sudo mongod --repair
For accessing mongodb from another machine in local network. You will need to check the following:
There is no firewall restriction in the server machine or client machine. In case there is a firewall, you will need to add rule exceptions to allow this port to be accessible. Both incoming and outgoing. (Ubuntu firewall)
You will have to add bindIp config to the mongodb config in server machine. Refer to docs here. You will need to add something like this:
net:
bindIp: 0.0.0.0
port: 27017
Make sure you are able to connect using this ip: 192.168.0.106(server in local network) from the server machine itself. This will make sure the server is listening in this ip.
$ Failed to start mongod.service: Unit mongod.service not found.
The solution for this error could be found here
The mongo atlas error might be due to the following reasons:
You will have to create an database user in order to connect to mongodb.
you can find it under the left panel -> Database access -> Add user
This will be because of a mismatch with username and password. In case you have any special characters in your password you will have to url encode them.
I have a basic flask application in which I am connecting with a local Postgres server.
The problem is that the application works fine when I run it using python manager. But when I use uWSGI to run application, the query doesn't executes i.e., it timeouts without throwing any error message.
I have a relatively simple wsgi configuration file like
[uwsgi]
module = wsgi
master = true
processes = 1
http = 0.0.0.0:5000
buffer-size = 32768
vacuum = true
die-on-term = true
My flask application uses psycopg2 to connect with localhost like
connection = psycopg2.connect(
host='127.0.0.1',
port=5432,
database='db',
user='user',
password='password'
)
I think this might probably be happening because postgresql socket is not accessible by uWSGI (reference). I believe this can be solved by providing postgres socket permission to uWSGI, but I am unable to figure out how. If there is another solution than that will also work.
I have tried running the following:
import pymongo
from pymongo import MongoClient
client = MongoClient('mongodb://localhost:27017/')
db = client.test_database
collection = db.test_collection
collection.find_one()
but I get
ServerSelectionTimeoutError: localhost:27017: [Errno 111] Connection refused
Any suggestions on how to fix this? I am running this behind a corporate proxy, but have already set environment variables for that in .bashrc.
EDIT
If I run mongo from the terminal, I get
$ mongo
MongoDB shell version v4.0.13
connecting to: mongodb://127.0.0.1:27017/?gssapiServiceName=mongodb
2019-10-16T10:30:23.269+0100 E QUERY [js] Error: couldn't connect to server 127.0.0.1:27017, connection attempt failed: SocketException: Error connecting to 127.0.0.1:27017 :: caused by :: Connection refused :
connect#src/mongo/shell/mongo.js:344:17
#(connect):2:6
exception: connect failed
Its look like you didn't run any mongo instance on your machine
run the command mongod -f <config_file> and then test it again (this may needs a sudo permissions)
I have deployed a flask app via zappa. The flask app makes a call to graphene, a service running neo4j db instances. I can connect to graphene through the terminal like this
from neo4j.v1 import GraphDatabase, basic_auth
driver = GraphDatabase.driver(
app.config['NEO4J_CONNECTION_URL'],
auth=basic_auth(app.config['NEO4J_CONNECTION_USERNAME'], app.config['NEO4J_CONNECTION_PASSWORD']),
encrypted=IS_ENCRYPTED
)
, flagging driver as unencrypted, and can run queries, etc. However, when I deploy this to AWS I get the error listed in the title, Errno 104 - connection reset by peer.
Stuck on this, not sure if there is other relevant info that would help solve the problem.
I am using windows8, for writing code I use IDLE. I tried to connect python to mongodb. But when trying to get collection name than it gives an error.
ServerSelectionTimeoutError: localhost:20101: [Errno 10061] No connection could be made because the target machine actively refused it
This is code for which i am getting an error.
from pymongo import MongoClient
connection = MongoClient('localhost',20101)
db = connection['Bhautik']
collection = db['Student']
db.collection_names(include_system_collections=True)
By the output message you probably didn't set your mongo bind_ip or didn't set the dbpath. Try this:
mongod --dbpath <database_path> --bind_ip 127.0.0.1 --port 20101
It would be more helpful to put alongside with your code some information regarding the mongodb configuration, like the server port, if you are using authentication or not, which dbpath you are using and so on.
So put in your question your mongodb.conf (if you are using one) or the command you are using to start the mongo server.
If you are starting to use mongoDB after installation, make C:/data/db because it is a default database directory which mongoDB uses.
To change the database directory, do type below:
C:\Program Files\MongoDB\Server\3.x\bin> mongod --dbpath "c:\custom_folder"
You can try
run mongo like that:
"C:\\Program Files\\MongoDB\\Server\\3.6\\bin\\mongod.exe" --dbpath E:\\data\\db --port 27017 --bind_ip 127.0.0.1
E:\data\db should be your location path
then in you code
it will lok like
client = MongoClient("127.0.0.1", 27017)
db = client['addsome']
datas = db.follow_up
and if you want to access from a distant machine make sure you open the port "27017" in the firewall
Some times it's gives this error when you forgot to run the local server (if it's run with local server).
To run it you need to write on your terminal:
mongod
or, if MongoDB not in PATH, you can find it via this link in your computer:
C:\Program Files\MongoDB\Server\4.0\bin\mongod.exe
In order to run MongoDB,
You should have installed MongoDB into your OS, download it from https://www.mongodb.com/download-center/community?tck=docs_server
Add the installation's bin folder to your system environment variables.
Openup the terminal and check 'mongod' and 'mongo' commands are working.
Then try to rerun your python script.