Backup mongodb directly to S3 (without using local disk). Requires http://s3tools.org/s3cmd.

backupmongotos3.sh

#!/bin/bash
#########
# Copyright 2014 Erdem Agaoglu
# 
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# 
#     http://www.apache.org/licenses/LICENSE-2.0
# 
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# 
########## 
# NOTES: #
##########
# 
# Requires http://s3tools.org/s3cmd. Run `s3cmd --configure` to define
# your AWS credentials if this is the first time you use s3cmd.
# 
# Configure your mongodb installation and s3 bucket in the variables.
# 
# Some bug in s3cmd multipart-uploads causes outputs like:
# 
#     File '-' stored as 's3://backups/prefix/collection.bson.gz' 
#       (0 bytes in 1.5 seconds, -1.00 B/s) [1 of 1]
# 
# Problem seems cosmetic.
# 
# Stored object's Etag is not the file's md5sum. Some clients (s3cmd 
# included) will issue a warning when you get the file.
#
##########

DATE=`date +%Y%m%d%H%M`

MONGOHOST=mongohost.example.com
MONGODB=mongodbname
S3CMDCONFIG=/home/user/.s3cfg
S3BUCKET=backups
S3PREFIX=mongohost/${MONGODB}/${DATE}/

MONGOCOLLS=`mongo ${MONGOHOST}/${MONGODB} --eval 'rs.slaveOk(); db.getCollectionNames()' |tail -1 |sed 's/,/ /g'`

LOGFILE=/var/log/backups/${MONGODB}.backup.${DATE}.log

echo --- `date +%Y%m%d%H%M%S` START | tee -a $LOGFILE

for coll in $MONGOCOLLS
do
	s3pos=s3://${S3BUCKET}/${S3PREFIX}${coll}.bson.gz
	echo --- `date +%Y%m%d%H%M%S` DUMPING $coll to $s3pos | tee -a $LOGFILE
	mongodump --host $MONGOHOST --db $MONGODB --collection $coll --out - |gzip -c |/usr/local/bin/s3cmd --config $S3CMDCONFIG put - $s3pos 2>&1| tee -a $LOGFILE
done

echo --- `date +%Y%m%d%H%M%S` END | tee -a $LOGFILE