Can't connect to mongodb locally even though mongod is running - mongodb

Question

I am unable to connect to my mongo database via external APIs or the mongo client locally, but can connect without issues from a remote host.
I have started mongod and can confirm that the server is running by visiting 127.0.0.1:27017
I have followed this answer with no luck
I have tried creating an entirely new database directory for mongo to generate a new set of database files, still no luck - so it's not a lock file or permissions issue.
$ mongo --verbose
MongoDB shell version: 2.4.4
Mon Jun 24 20:11:08.764 versionArrayTest passed
connecting to: test
Mon Jun 24 20:11:08.847 creating new connection to:127.0.0.1:27017
Mon Jun 24 20:11:08.847 BackgroundJob starting: ConnectBG
Mon Jun 24 20:12:11.848 JavaScript execution failed: Error: couldn't connect to server 127.0.0.1:27017 at src/mongo/shell/mongo.js:L112
Mon Jun 24 20:12:11.848 User Assertion: 12513:connect failed
exception: connect failed
I am running Ubuntu 12.04, I have installed mongo from the 10gen repo. Everything was running flawlessly originally, but after restarting the server, mongo fails to connect.
My netstat returns:
$ netstat -nap
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:27017 0.0.0.0:* LISTEN -
tcp 0 0 127.0.0.1:3306 0.0.0.0:* LISTEN -
tcp 0 0 0.0.0.0:10000 0.0.0.0:* LISTEN -
tcp 0 0 0.0.0.0:28017 0.0.0.0:* LISTEN -

Answer 1

I gotten the same problem on CentOs 6.4 (Mongo 2.4.5, but actually it happens in other versions too). There is weird threading issue. I debugged mongo and found workaround. It is required mongo recompile. It looks like timed_wait method from boost library returns timeout when spurious wake up happened. I am not sure where bug is: mongo, boost, glibc, linux kernel.
Mongo 2.4.5
Replace in src/mongo/util/background.cpp method BackgroundJob::wait
bool BackgroundJob::wait( unsigned msTimeOut ) {
verify( !_status->deleteSelf ); // you cannot call wait on a self-deleting job
scoped_lock l( _status->m );
boost::system_time const endTime = boost::get_system_time()+ boost::posix_time::milliseconds(msTimeOut);
if ( msTimeOut ) {
while ( _status->state != Done ) {
if ( ! _status->finished.timed_wait( l.boost() , endTime ) ){
boost::system_time const curTime=boost::get_system_time();
if((curTime - endTime).total_milliseconds()>0){
return false;
}
else {
LOG( LL_WARNING ) << "backgroundjob " << name() << "warning: spurious wakeup return TIMEOUT code but we want wait "<<(endTime-curTime).total_milliseconds()<<" ms yet! Try again." << endl;
}
}
}
}
else {
while ( _status->state != Done ) {
_status->finished.wait( l.boost() );
}
}
return true;
}
After some time I found other problem with Perl:
perl -MCPAN -e 'install "DateTime"'
Simple Perl test failed:
use strict;
use warnings;
use Test::More;
use DateTime;
{
my $epochtest = DateTime->from_epoch( epoch => '997121000' );
is(
$epochtest->epoch, 997121000,
"epoch method returns correct value"
);
}
I discovered that the problems with Perl and Mongo disappear if I remove /etc/localtime file!

Answer 2

I had the same issue running mongod 3.0.2 on Ubuntu 14.04:
MongoDB shell version: 2.4.9
Sun Apr 26 00:57:31.604 versionArrayTest passed
connecting to: xxx.xxx.xxx.xxx:27000/test
Sun Apr 26 00:57:31.667 creating new connection to:xxx.xxx.xxx.xxx:27000
Sun Apr 26 00:57:31.667 BackgroundJob starting: ConnectBG
Sun Apr 26 00:57:31.668 connected connection!
Sun Apr 26 00:57:31.671 User Assertion: 18:{ ok: 0.0, errmsg: "auth failed", code: 18 }
Sun Apr 26 00:57:31.673 Error: 18 { ok: 0.0, errmsg: "auth failed", code: 18 } at src/mongo/shell/db.js:228
Sun Apr 26 00:57:31.673 User Assertion: 12514:login failed
Sun Apr 26 00:57:31.673 freeing 1 uncollected N5mongo20DBClientWithCommandsE objects
exception: login failed
The distribution came from MMS Mongo:
https://mms.mongodb.com/
I then noticed on my MMS page, under mongod processes -> elipse menu;
a menu called:
"Connect to this Mongod Instance"
which returned a string:
"/var/lib/mongodb-mms-automation/mongodb-linux-x86_64-3.0.2/bin/mongo RBX1:27000"
(RBX1 being my instance and 27000 being the port I set)
Once I applied this string in my shell (I added extra user / password and authenticationDatabase parameters, and it worked.
I can now connect to my Mongod instance both locally and remotely.
Did you install MongoDB through MMS?