Platform: LINUX.
I am a beginner of MongoDB and pymongo. After installing pymongo, here is a simple test I tried on ipython:
import pymongo
client = pymongo.MongoClient();
# Also tried to specify the local host and port number
db = client['myDB']
collections = db['temptables']
collections.insert({'a':'1'})
At this point, it chokes. And in the end, spits out a “Error 111: connection refused” error. So, I tried invoking MongoDB straight from the terminal and I still got the error below [look at the far end]. So, I searched a bit and tried:
removing the lock ( sudo rm /var/lib/mongodb/mongod.lock ). Turns out there was no lock in the first place.
sudo mongod –repair
I even saw a suggestion to comment out the host and port number from the config file. Tried that too, didn’t work.
None of the above worked.
This is the error I see when I try to invoke mongodb from command line.
017-08-17T15:25:30.265-0700 W NETWORK [thread1] Failed to connect to 127.0.0.1:27017, in(checking socket for error after poll), reason: Connection refused 2017-08-17T15:25:30.265-0700 E QUERY [thread1] Error: couldn’t connect to server 127.0.0.1:27017, connection attempt failed : connect@src/mongo/shell/mongo.js:237:13 @(connect):1:6
exception: connect failed
Help, please.
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Answer
Your mongo server isn’t running.
You can confirm this by executing sudo ps -ef | grep mongod
If you have mongo installed and in your path, you can execute:
cd && mkdir -p ~/temp_mongo_db && mongod --dbpath=./temp_mongo_db
This will launch mongo and place all database files in your home directory under ‘temp_mongo_db’.
Finally, in a new terminal window, execute sudo ps -ef | grep mongod again. You’ll now see mongod running.
If you want to run mongo in production, you should configure it to be managed by SystemD or some other init system.