TylerBrock

db.getSiblingDB("admin");

var databases = null;

databases = db.runCommand("listDatabases");

if(databases){

    for(var i=0;i<databases.databases.length;i++){
        //TODO skip if it's the admin database

TylerBrock

// make sure we're using the right db; this is the same as "use aggdb;" in shell
db = db.getSiblingDB("aggdb");

// simple projection
var p1 = db.runCommand(
{ aggregate : "article", pipeline : [
    { $project : {
	tags : 1,
	pageViews : 1
    }}

TylerBrock

/* sample aggregate command queries */
// make sure we're using the right db; this is the same as "use mydb;" in shell
db = db.getSisterDB("aggdb");

// just passing through fields
var p1 = db.runCommand(
{ aggregate : "article", pipeline : [
    { $project : {
	tags : 1,
	pageViews : 1

TylerBrock

OS Setup
- Install VMs (base OS = Ubuntu 11.04)
     - 6GB disk is not enough.  Probably 20-40GB would be good.  Mongo has a lot of compression and cleanup features coming.
- Create user to run MongoDB as
- Get DNS or Hosts file set up so all nodes in the cluster can talk to each other
- Generate ssh-keygen -t rsa
- Copy ssh public keys from each node to node01.  Then cat all keys to authorized_keys.  Then copy that file to each node.  Each node will have ssh key trust now.  You will also want to ssh from node01 to 02,03,04; from node02 to 01,03,04 etc to test it out.
- Create an initial architecture:
node01: master (replica set 1)
node02: slave  (replica set 1)

TylerBrock

#!/usr/bin/env sh

##
# This is script with usefull tips taken from:
#   https://github.com/mathiasbynens/dotfiles/blob/master/.osx
#
# install it:
#   curl -sL https://raw.github.com/gist/2108403/hack.sh | sh
#