MongoDB is a document oriented database (also known as NoSQL database).

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MongoDB Oplog Security

We are using a MongoDB replica set for sharing sessions and other (potentially sensitive) data in a web farm. All the data we store uses TTL indexes to expire documents after a relatively short ...
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194 views

Corrupt WiredTiger MongoDB files

I'm running MongoDB with the WiredTiger engine on an ext4 file system. The last thing that I did was start building an index, but then something came up and I needed to cancel the index build and ...
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166 views

adding mongodb authentication breaks connecting via nodejs

I needed to have external access to my mongodb database, so I have removed the bind_ip from the mongod.conf file, and turned on auth. I then added a root user that can access everything, and tried to ...
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483 views

How to find/kill long running mongo scripts

I think I have a long running mongo script tanking my database, but I'm not sure. I was connected to the linux server via SSH and I ran the script like so: mongo my_database my_script.js It started ...
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17 views

MongoDB versus Neo4j versus Postgres for 50M/daily requests application

I'm new both to MongoDB and Neo4j, but had experience in Postgres 9.3. I'm asking for suggestions/corrections/advices. I have an application that operates with tree data structure requires to ...
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21 views

Digital Ocean and Scalable MongoDb

I am looking into using the MEAN stack on Digital Ocean but am struggling a bit on the MongoDb side of things. Digital Ocean don't allow you to add a custom size of SSD to your droplets which causes ...
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12 views

What is the resolved default location mongod.exe looks for the configuration in?

Trying to do a minimal configuration of mongod, and I would like to use the 'natural' pathing structure for the location of the config file. To give an example on what I am looking for, here are the ...
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35 views

MongoDB fsyncUnlock won't unlock occasionally on Windows

We have a MongoDB replica set installed on Windows servers, with a scheduled backup job. MongoDB is configured to use journaling. The job runs db.fsyncLock() via script on MongoDB (primary server), ...
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27 views

Huge oplog size after full sync on one secondary causing performance issues - MongoDB

I'm a MongoDB newbie. I have a replica set with 3 members (1 primary and 2 secondaries) on CentOS 6 and Mongo 2.6.8. One of the secondaries crashed because of high consumption of memory and I ...
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114 views

Mongo 2.6.9 process stopping, no error logs

I have a Mongo 2.6.9 process running on a Linux SMP instance. Here's uname -a with the server name redacted: Linux xxx.xxxx.com 3.13.0-042stab085.20 #1 SMP Sun Jul 20 13:27:24 MSK 2014 x86_64 x86_64 ...
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42 views

MongoDB Backup & purge

I'm exploring solutions for a basic dbadmin need : periodically backing up and purging data in MongoDB. Basically, I need a logrotate for mongodb. I have a backend program filling a collection. I ...
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102 views

MongoDB Install Simple Test Ops Manager java.lang.OutOfMemoryError on startup

just installed a test evaluation of MongoDB Ops Manager and get an error on startup of the Backup HTTP server: Migrate MMS data Running migrations...[ OK ] Start MMS server Instance 0 ...
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5 views

MongoDB - Tie user to specific replica set node

Is there a way in MongoDB 3.0 to allow users access to only a single replica set node? We have a lot more data on disk than we do memory. So to keep our production support from paging into memory ...
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126 views

exception in initAndListen: 28595 2: No such file or directory, terminating

after server crashed, mongod service don't start. OS: Windows Server 2008 R2 start mongo version: 3.0.0 repair option don't help, journal directory is empty after crash update mongo to 3.0.2, this is ...
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379 views

How to display MongoDB stats in Graphite?

After googling for 2 days with no solution I would like to know if anyone uses Graphite with either CollectD or StatsD to include MongoDB statistics in a dashboard. I was hoping for an up-to-date ...
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102 views

MongoDB mongos memory usage

Planning how to deploy a shard-ready cluster (Single shard at the moment, with all config servers and mongos processes), I've read the MongoDB operations best practices. I have doubts about the memory ...
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38 views

Merge 7 node mongodb (2.4) cluster into one standalone mongo shard

I'm running a 7 node mongodb sharded cluster (version 2.4...). I would like to merge this into a standalone shard with 7 times the disk-space. I've tried to create the single shard instance and ...
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396 views

MongoDB high CPU usage

Running MongoDB 2.4.11 on Ubuntu 14.04.1 LTS In top, this mongod thread is constantly using ~195% CPU: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 24524 mongodb 20 ...
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82 views

Mongo Cluster - Unresponsive node/primary prevents creation of databases, secondary didn't take over

I have a Mongo cluster with a few shards each backed by replicasets with a primary, a secondary and an arbiter. Today one of the primaries became unresponsive. I logged into it directly and tried a ...
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155 views

Migrate standalone Mongo DBs to sharded/replicated cluster

Currently I have several independent standalone Mongo servers. I have Now set up a sharded and replicated Mongo cluster. I plan to copy over all databases from the standalone Mongo servers to the ...
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1k views

how to integrate between MONGODB & SOLR, using MONGO-CONNECTOR

Like this I started my mongod with replSet mod mongod --dbpath=/home/local/ASSYST-COC/so/mongo --replSet myrep --auth mongo started mongo -u root -p root --authenticationDatabase admin IN ...
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626 views

MongoDB Performance Troubleshooting

I have a small MongoDB replica set (2.4.6) and it seems about once a week, the primary gets bogged and the load average spikes up. This app doesn't see a huge amount of traffic. It resides in EC2 ...
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18 views

How to allocate more resources to Node.JS process?

I'm not a (very good) back-end developer so understanding processes and memory are a little about my pay grade. I'm currently building an app using the MEAN stack. I have a separate Express server ...
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13 views

How to monitor MongoDB cursors

I have a MongoDB cluster with 1 PRIMARY and 2 SECONDARY servers. In the last couple of days the number of open cursors has risen from 10-20 a sec to more than 2K and keep rising. I'm getting a lot of ...
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16 views

MongoDB: exception: no primary shard configured for db: config, code: 8041

I have set up mongodb sharded cluster with 2 replica set having 3 member each, 3 config server and 2 mongos instance on AWS. I am getting following error I SHARDING [Balancer] moveChunk result: { ...
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5 views

MongoDB with ReplicaSet perform updates / compact

I have a MongoDB in ReplicaSet with 1 primary, 1 secondary and 1 arbitrer. I'm doing an heavy update operation on a huge collection (more than 2.5M records), this operation will decrease the ...
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5 views

ISSnode not able to reconnect to MongoDB on Azure Webapps

Its weird that ISSNODE is preventing re-connection to mongodb replica set in the following scenario. Primary server goes down and secondary server is set as primary server, at this period the ...
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8 views

Can mongos 2.6.x / 3.x connect to mongod 2.4.x?

We are currently in the process of upgrading our 2.4.x mongodb sharded cluster to 3.x (via 2.6.x). We have a large number of mongos instances, as we have mongos installed locally on each of the ...
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42 views

Unable to install php-mongo extension

i'm trying to install the mongo.so extension but it fails. According to PHP Mongo Installation manual, i should run : sudo pecl install mongo tho i get this error : downloading ...
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20 views

mongodb sh.addShard returns error: host does not belong to replica set

I try to create a mongodb cluster with three config servers, two shards with three replica each and one query router. The installation of the config servers, query router, and the creation of a ...
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53 views

How To: Dockerized MongoDB Replication on Elastic Container Service

I have a Node.js app together with a MongoDB database running on AWS ECS. The setup I've got currently is formed of 2 ELB's and 2 Instances running each a Docker container with its assigned service ...
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15 views

pymongo authentication in mac os failing

I have a database named 'abc', for which I created a user "dc". The db.getUsers() from mongo shell shows [ { "_id" : "abc.dc", "user" : "dc", "db" : "abc", "roles" ...
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24 views

MongoDB 3.0 on RHEL 6.5 - Startup fails with WT storageengine

I have MongoDB 3.0 installed on RHEL 6.5. The initial setup was done using MMAPv1 storage engine and works fine. i'm currently trying to switch this installation to a WiredTiger storage engine and ...
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13 views

Mongod cli version differs from db.version

I've followed the instructions to upgrade Mongo from 2.4 to 2.6, which was basically just to install the new binaries, but the versions being reported are inconsistent. I've tried restarting the ...
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12 views

Ensure Full Admin When Upgrading User Profiles

I have a MongoDB replica set who is sitting on version 2.6 currently. After trying to update our secondary to 3.x, I found out that I need to update the users on the admin table to be 2.6 compliant. ...
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11 views

Disabling Transparent Huge Pages for Mongodb - is it important?

I am running mongodb on a server with other software running as well. So before disabling this setting on my system , i have 2 questions: 1) how much does it change for mongodb ? does it really ...
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16 views

MongoDB backup browse GridFS

I have "big" MongoDB database (~100GB) with GridFS, using mongodump I made backup for this database and I wan't to browse files in GridFS, can this be done without restoring backup?
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34 views

Random mongo shutdown

I had mongo randomly shutdown on one of my servers today and I was wondering if anyone could take a look at the logs below and tell me what might have happened. The server is hosted on digital ocean ...
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48 views

DataFileSync flushing mmaps takes a long time

We are running MongoDB 2.6.9 on a 64 bit Ubuntu Linux VM. When I look in the database folder, this is what I see with ls -lh: -rw------- 1 mongodb mongodb 64M Apr 15 14:26 admin.0 -rw------- 1 ...
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27 views

AWS deployed mongodb not connecting through node JS driver

I have a weird problem. I was able to connect mongodb through node JS drivers two days back. Suddenly I am getting connection time out. Mongodb is installed on Amazon AWS. I am able to connect mongodb ...
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40 views

mongodb avgObjSize confusion and effect of field length on storage size

I have a Replica Set of 3 instances instance A: Mongodb 3.0 (using wiredtiger storage engine) instance B: Mongodb 2.6 (using good old mmapv1) instance C: Mongodb 3.0 arbiter and i have 3 ...
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228 views

set up Apache2 virtual hosts and now MongoDB connection refused

I'm running Ubuntu 14.04 on an AWS EC2 instance with Apache2. This morning I upgraded my Apache2 settings to allow multiple virtual servers following these instructions. Just now I tried to access my ...
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11 views

varnish - little delay after 5 seconds

I installed varnish on a hello world application, along with nginx, hhvm and mongodb. The only things that bugges me is that the first time when I access the url I get around 125 ms response time and ...
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16 views

Error: no open connections at Db._executeQueryCommand

I have a node application used with express framework. This application runs smoothly. But suddenly, after some point of time, it starts to give error as "Error: no open connections at ...
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231 views

Expanding HAProxy health check to monitor MongoDB primary and secondary state

Follow up question regarding the MongoDB health check with HAProxy How to construct a MongoDB Health Check in HAProxy? The current solution works well when the focus is on determining if mongo ...
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MongoDB cluster network Resilience with 2 ethernet only

I wonder if it is possible to configure a network resilience mongodb cluster using only 2 ethernet adapter card on each node. I configured the cluster with 3 nic emulating the third nic using vip ...
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91 views

Slow insert speed to Mongodb utilizing Mongoid ORM

I have a production platform utilizing Sidekiq, Mongoid and a replica set (3 nodes). This has been operational for about 6 months and running very smoothly. All jobs were processing in usually less ...
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72 views

Best practice of using MongoDB Replica Set on AWS EC2

MongoDB needs at least three replica set members on independent locations to work automatic failover correctly. However, some of AWS Regions (such as ap-northeast-1) have only two Availability Zones. ...
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222 views

mongodb authentication not working in puppet

I used the same connectionstring in the terminal and it's working ok. But from Ruby I get error output when vagrant provision runs mongo admin -u 'vaga' -p 'vaga' --authenticationDatabase admin ...
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16 views

Database groups in mongodb

I'm facing a problem (well, not a real problem, more of a detail) in deploying an infrastructure for several applications. Some of them use PostgreSQL and some of them MongoDB. I would like to run ...