Failing to connect to remote mongodb server

Question

I am trying to create a remote mongodb server to work with on my java project.

I am using vagrant + ansible to create the environment, but fr soem reson i cannot get a connection.

I always get connection refused through the network. the same code on localhost works perfectly.

I am using vagrant box: chef/centos-6.5

and my ansible tasks are as follows:

- name: Download EPEL Repo
  get_url: url=http://dl.fedoraproject.org/pub/epel/6/x86_64/epel- release-6-8.noarch.rpm dest=/tmp/epel-release-6-8.noarch.rpm
- name: Install EPEL Repo
  command: rpm -ivh /tmp/epel-release-6-8.noarch.rpm creates=/etc/yum.repos.d/epel.repo
- name: Install libselinux-python
  yum: name=libselinux-python
- name: Create the repository for 10Gen  
  copy: src=10gen.repo.j2 dest=/etc/yum.repos.d/10gen.repo
- name: Create the EPEL Repository.
  copy: src=epel.repo.j2 dest=/etc/yum.repos.d/epel.repo
- name: Create the GPG key for EPEL
  copy: src=RPM-GPG-KEY-EPEL-6 dest=/etc/pki/rpm-gpg
- name: Create the mongod user
  user: name=mongod comment="MongoD"
- name: Create the data directory for the namenode metadata
  file: path={{ mongodb_datadir_prefix }} owner=mongod group=mongod state=directory
- name: Install the mongodb package
  yum: name={{ item }} state=installed
  with_items:
   - libselinux-python
   - mongo-10gen
   - mongo-10gen-server
   - bc
   - python-pip
- name: Install the latest pymongo package
  pip: name=pymongo state=latest use_mirrors=no 

i have added the iptables exceptions:

sudo iptables -A INPUT -p tcp --dport 27017 -j ACCEPT

which is active:

[root@localhost ~]# iptables -L -v
Chain INPUT (policy ACCEPT 209 packets, 13148 bytes)
 pkts bytes target     prot opt in     out     source               destination
 1070 68777 ACCEPT     tcp  --  any    any     anywhere             anywhere            tcp dpt:27017

my java code defining MongoDbFactory

public @Bean
MongoDbFactory mongoDbFactory() throws Exception {
    MongoClient mongo = new MongoClient("<ip-of-machine>", 27017);
    return new SimpleMongoDbFactory(mongo, "test");
}

But i always get the following exception when trying to connect to it.

com.mongodb.MongoTimeoutException: Timed out after 10000 ms while waiting for a server that matches AnyServerSelector{}. Client view of cluster state is {type=Unknown, servers=[{address=192.168.1.11:27017, type=Unknown, state=Connecting, exception={com.mongodb.MongoException$Network: Exception opening the socket}, caused by {java.net.ConnectException: Connection refused}}]

If i run mongodb from localhost and change the ip accordingly, everything works fine.

Thanks

Answer 1

Firstly, To ensure its not a firewall issue, stop IPTABLES on both servers (don't forget to re-enable afterwards).

On the machine that you are trying to connect to, ssh directly to it and ensure MongoDB is running, Connect locally and check that you can access a DB.

MongoDb isn't configured to accept connections from remote hosts by default, could you ensure you have these lines in your /etc/mongodb.conf file:

bind_ip = 0.0.0.0
port = 27017

Make sure you restart MongoDB after making any changes. Try this and comment if your still having issues and I'll update the answer with more suggestions.

EDIT: As of version 2.6 the config file format has changed to YAML, details here, the file should be located at /etc/mongod.conf.

net:
   bindIp: 0.0.0.0
   port: 27017