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Does a MongoDB replica set require at least 2 or 3 members?

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http://serverfault.com – Documentation here says three: http://docs.mongodb.org/manual/tutorial/deploy-replica-set/ "A replica set requires three distinct systems..." Whereas the documentation here says two: http://docs.mongodb.org/manual/core/replication/ "Most replica sets consists of two or more mongod instances..." Anyone know which is correct? (HowTos)

taskli's picture
Submitted by taskli on 01/04/2013

Stories similar to Does a MongoDB replica set require at least 2 or 3 members?

I have a fast Windows 7 PC with 8Gb RAM. I want to test this MongoDB replica set: http://www.mongodb.org/display/DOCS/Replica+Sets for my development. I dont want to buy 3 PCs though, as it's kind of expensive. Is there a way to use some kind of technology, like Hyper-V, to be able to set it up? If not, how many PC and what kind should I buy?

I installed MongoDB in an Ubuntu Server VM inside VMware using these instructions: http://docs.mongodb.org/manual/tutorial/install-mongodb-on-ubuntu/. Everything works fine, and I can access MongoDB at the regular port 27017

./mongo 172.16.150.131:27017

Now, I want to make a dummy replica set and another db instance for testing my app.

MongoDB and NUMA architecture 17 weeks 2 days ago

Our mongodb process is consistently using >100% of our CPU (this is on an Ubuntu 64-bit server on Linode) and we're casting about for performance improvements.

One suggestion we found was that MongoDB and NUMA don't work well together: http://docs.mongodb.org/manual/administration/production-notes/#producti...

I notice that /proc/sys/vm/zone_reclaim_mode is already set to 0 and numactl is no

Mongodb Slave replication lag 28 weeks 6 days ago

We using standard mongo setup: 2 replicas + 1 arbiter. Both replica servers use same AWS m1.medium with RAID10 EBS.

We experiencing constantly growing replication lag on secondary replica.

I've just installed mongodb, and had to install 2.0.4, which I couldn't figure out how to do with 10gen, so followed this tutorial and installed from the tar file.

http://antimalwarelab.com/installing-ubuntu-10-04-1-lts-64-bit-mongodb-2...

Now, in order to start the server, I have to go to ~/mongodb-linux-x86_64-2.0.4/bin and then type ./mongod.

I want to start over the configurations of replica, is it possible? How to reset it?

In group people saying to remove the database content, but are there any work around?

install mongodb on window 8 10 weeks 12 hours ago

I am trying to install mongodb on Windows 8.

I am using following command to install Mongodb.

C:\mongodb\bin\mongod.exe --auth --config C:\mongodb\mongod.cfg --install

And getting this error:

Wed Mar 13 19:13:23 Trying to install Windows service 'MongoDB' Wed Mar 13 19:13:23 Error connecting to the Service Control Manager: Access is denied.

I have three servers with mongod installed on it running as a replication set. Suddenly the two secondories became unavailable (the mongod process died) - I think because they were too stale.

The problem is that the original PRIMARY is now the SECONDARY and my application doesn't work because it can't connect to a PRIMARY.

I mean, in which way does that help me?

I have a MongoDB 2.0.4 installation on Ubuntu 12.10. Recently I had some problems connecting to the database from the outside, and figured out there was something which prevented MongoDB from starting correctly. As suggested on several sources (see StackOverflow) I removed /var/lib/mongodb/mongodb.lock and ran mongod --repair.