High Availability MongoDB & Replica Sets – A How To & Kinda Tutorial

So it’s kinda weird, last year I did 2 talks in the same month, 1 on WordPress (High Performance WordPress – Scaling, Tuning, Optimizing & More) & one which was more random (The History Of The Future at WebCamp KL.

This year I ended up doing 2 presentations in the same week (actually on 2 consecutive days), and once again the first was technical and the second a bit more random.

The first one was about MongoDB and was for the KL Mongo User Group AKA KL MUG. For those that don’t know what MongoDB is, it’s one of a new breed of SQL engines in the NOSQL camp – this means no more horrible SQL statements, no tables/columns/rows. Just documents being stored however you like.

MongoDB (from “humongous”) is a scalable, high-performance, open source NoSQL database. Written in C++, MongoDB features:

Here’s me with my AWESOME Linode t-shirt giving the talk.

ShaolinTiger talking about MongoDB

Some useful references I used:

Replica Sets
Replica Sets – Basics
Replication Fundamentals
Replica Set Administration
Replica Set Tutorial
Use MongoDB to Store Application Data on Ubuntu 10.04 (Lucid)
MongoDB Replica Sets on EC2
Fun with MongoDB replica sets
Recommended practice to deploy MongoDB on EC2 for production?
MongoDB Infrastructure Tests (Part I: Setting up Replica Sets with MongoDB)
MongoDB Monitoring: Keep in it RAM
My Experiences with MongoDB in production over the last year
Security and Authentication
Ubuntu and Debian packages

Munin plugins for MongoDB
Munin configuration examples

The official MongoDB documentation and wiki is REALLY good, and also one of the reasons why I choose MongoDB over the others.

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2 Responses to High Availability MongoDB & Replica Sets – A How To & Kinda Tutorial

  1. Manuel March 7, 2013 at 5:43 am #

    Why do you suggest disabling swap? Got any refs?

    • ShaolinTiger March 7, 2013 at 2:21 pm #

      I disable swap on ALL servers, I prefer a process to get reaped (and restarted with something like monit) than to go into swap hell. Plus I have monitoring so I’ll know I need to add more RAM. If a server starts swapping, performance drops so much and the disk bottlenecks the processing so the CPU will just lock and everything will become totally inaccessible. You can read more on it at Google, there’s plenty of discussions on this.

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