mongoDB, connection refused

Question

My following implementation runs successfully if the host is localhost or 127.0.0.1:

conf.set( "mongo.input.uri" , "mongodb://127.0.0.1/flow.mrtest" );

conf.set( "mongo.output.uri" , "mongodb://127.0.0.1/flow.mrtest_out2" );

But when I changed it to IP wlan0 192.168.1.102, it gives me the error as follows:

Cluster created with settings {hosts=[192.168.1.102:27017], mode=SINGLE, requiredClusterType=UNKNOWN, serverSelectionTimeout='30000 ms', maxWaitQueueSize=500}

Exception in monitor thread while connecting to server 192.168.1.102:27017

com.mongodb.MongoSocketOpenException: Exception opening socket

    at com.mongodb.connection.SocketStream.open(SocketStream.java:63)

    at com.mongodb.connection.InternalStreamConnection.open(InternalStreamConnection.java:114)

    at com.mongodb.connection.DefaultServerMonitor$ServerMonitorRunnable.run(DefaultServerMonitor.java:127)

    at java.lang.Thread.run(Thread.java:745)

Caused by: java.net.ConnectException: connection refused

    at java.net.PlainSocketImpl.socketConnect(Native Method)

    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)

    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)

    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)

    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)

    at java.net.Socket.connect(Socket.java:589)

    at com.mongodb.connection.SocketStreamHelper.initialize(SocketStreamHelper.java:50)

    at com.mongodb.connection.SocketStream.open(SocketStream.java:58)

    ... 3 more

I have also opened the port 27017 and I am having Ubuntu 14.04. as my operating system.

sudo iptables -A INPUT -ptcp --dport 27017 -j ACCEPT

Answer 1

MongoDB by default connects to the loopback interface that causes it to only reachable from the localhost. You just have to add the following code in mongod.conf file:

# /etc/mongod.conf

# Listen to the local interface only. Comment out to listen on all interfaces.

bind_ip = 127.0.0.1

You can also switch your bind_ip to 127.0.0.1,192.168.1.102  for allowing the LAN and local connections.

Want to learn MongoDB from the experts, Check out this MongoDB Course in London to enhance your Knowledge!