Dumping MongoDB database

Last couple of months I was wandering through the world of MongoDb, both as a developer and as a sysadmin. I won’t say how happy I’m with it or how much I got disappointed , I will just note that you don’t know how deep or serious you dived into a software product till the moment when you feel the need for a backup. And that day came, and I did something about it.

I’m not so much into installing backup software that will just do the things for me, I always start with the idea that I can do it with my own simple implementation that will fill my needs for saving data or doing something else. Mongo has become a huge software/database monster and there are a lot of different approaches regarding this question. Off course the right way for you depends of several factors. Some of them are: the infrastructure of the Mongo deployment, the importance of the data, the quantity of the data, the performance factor etc.

For my needs that are associated with a single cluster instance of Mongo database without replication or sharding I realized that using the “classical” dumping method will fulfil .
One of the things I like about Mongo is its nicely done documentation. A lot of information about backuping MongoDb can be found on its official site:

http://docs.mongodb.org/manual/core/backups/

The documentation is like a guide showing you the different ways of backuping. Generally there are 3 different approaches: doing file system snaphosts, using mongodump command and using MongoDB Management Service.

For my dumping approach I wrote simple and primitive bash shell script that you can use for local backups or as a push towards the idea how to backup mongo data. It is oriented around dumping databases. Mongo data can be dumped as whole instance, whole collection or part collection and as a database. Here is the scirpt, the product of it are BSON and metadata JSON files at the designated directory.

#!/bin/bash

#
# GNRP LICENSE: Script licensed by GOD
#
# @author: Igor Ivanovski <igor at genrepsoft.com>
#
# March, 2015
#

#
# Filesystem directory variables
#

# Now in format: YYYY-MM
DATEYYMM=`date +"%Y-%m"`

# Now in format: DD
DATEDD=`date +%d`

# Backup directory 
BACKUPDIR="/opt/backup/mongodumps"

# Daily backup directory
BACKUPDIRDAILY="$BACKUPDIR/$DATEYYMM/$DATEDD/"

#
# List of databases to backup
#
DBs="
admin
someDb
";

#
### Mongo Server Setup ###
#

# Don't forget to add adequate roles if you are using authenticatio
#use someDb db.createUser({user:"backup",pwd:"pwd",roles:["readWrite"]})
#use admin db.createUser({user:"backup",pwd:"pwd",roles:["backup"]})

# Mongo backup username  
MUSER="backup"

# Mongo backup password
MPASS="pwd"

# Mongo HOST  name
MHOST="localhost"

# Mongo PORT number 
MPORT="27017"

# Mongo dump binary 

# Check if mongodump is installed
STATUS=0
[ "Y`which mongodump`" != "Y" ] && STATUS=$? || STATUS=$?
[ $STATUS == 1 ] && echo "No mongodump found. Exiting"; exit 1 
MONGODUMP=`which mongodump`;

# Starting to dump databases one by one
if [ "X$DBs" != "X" ]; then
    for db in $DBs
        do
            echo "Backing up database $db"
            $MONGODUMP --host $MHOST --port $MPORT --username $MUSER --password $MPASS --out $BACKUPDIRDAILY --db $db
        done

else
        echo "All listed mongo databases dumped. Bye"
fi

Thank you for reading me, here is a bonus from me for swinging 😉

1 thought on “Dumping MongoDB database”

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

w

Connecting to %s