#!/bin/sh

# Make sure to:
# 1) Name this file `backup.sh` and place it in /home/ubuntu
# 2) Run sudo apt-get install awscli to install the AWSCLI
# 3) Run aws configure (enter s3-authorized IAM user and specify region)
# 4) Fill in DB host + name
# 5) Create S3 bucket for the backups and fill it in below (set a lifecycle rule to expire files older than X days in the bucket)
# 6) Run chmod +x backup.sh
# 7) Test it out via ./backup.sh
# 8) Set up a daily backup at midnight via `crontab -e`:
#    0 0 * * * /home/ubuntu/backup.sh > /home/ubuntu/backup.log

# DB host (secondary preferred as to avoid impacting primary performance)
HOST=db2.example.com

# DB name
DBNAME=dbName

# S3 bucket name
BUCKET=mongodb/backup

# Current time
TIME=`/bin/date +%m-%d-%Y-%T`

# Username
USERNAME=johndoe

# Password
PASSWORD=strongPassword

# Log
echo "Backing up $HOST/$DBNAME to s3://$BUCKET/ on $TIME";

S3PATH="s3://$BUCKET/"
S3BACKUP=$S3PATH$TIME.gz
S3LATEST=$S3PATH"latest".gz
# Make S3 bucket
/usr/bin/aws s3 mb $S3PATH
# Dump from MongoDB data to S3
/usr/bin/mongodump -h $HOST -d $DBNAME -p $PASSWORD -u $USERNAME --authenticationDatabase "admin" --gzip --archive | aws s3 cp - $S3BACKUP
# Copy the new backup to latest
/usr/bin/aws s3 cp $S3BACKUP $S3LATEST

# All done
echo "Backup available at https://s3.amazonaws.com/$BUCKET/$TIME.gz"

# To restore stabase
# aws s3 cp s3://mongodb/backup/latest.gz - | mongorestore -h db1.example.com -d dbName --archive --gzip -u johndoe -p strongPassword --authenticationDatabase admin