Inter-Region Cloud Instance Migration

1. Objective

The objective of this setup is to implement cross-region data replication between two cloud instances using Rsync.

This includes:

• Deploying an Ubuntu Cloud Instance in the Indore region (Primary Site)

• Deploying an Ubuntu Cloud Instance in the Mumbai region (Target Site)

• Installing and configuring Rsync on both instances

• Transferring application data from Indore to Mumbai

• Verifying successful data synchronization

• Ensuring reliable and consistent data availability across regions

---

2. Architecture Overview

This architecture consists of two cloud instances located in different regions:

• Primary Instance (Indore): Source of data where application data is generated

• Target Instance (Mumbai): Destination where data is replicated

Data transfer is performed using Rsync over SSH, ensuring secure and efficient synchronization. Automation can be implemented using cron jobs for periodic updates.

---

3. Prerequisites

Before starting the data replication setup, ensure the following requirements are met:

---

3.1 Infrastructure Requirements

• One Ubuntu Cloud Instance in the Indore region (Primary)

• One Ubuntu Cloud Instance in the Mumbai region (Target)

• Public IP assigned to both instances

• Network connectivity between both instances

---

3.2 Security Configuration

• Secure communication is established using SSH

• SSH access is enabled on both instances

• Authentication is configured using SSH key-based authentication

Security Note:

Data transfer between the two instances is secured using end-to-end encryption via SSH, ensuring confidentiality and integrity of data.

4. Phase 1 : Connect to Primary VM & Install rsync

---

Step 1 : Connect to Primary VM(ssh)

Run from Local Laptop / PowerShell / Terminal(cmd)

ssh -i <PRIMARY_KEY>.pem ubuntu@<PRIMARY_PUBLIC_IP>

---

Step 2 : Update System

Run inside Primary VM(indore region)

sudo apt update && sudo apt upgrade -y

---

Step 3 : Install rsync

Run inside Primary VM

sudo apt install rsync -y
rsync --version

Expected output:

rsync version 3.x.x

---

5. Phase 2 : Create Test Data on Primary VM

---

Step 4 : Create Test Directory and Files

Run inside Primary VM

mkdir -p /home/ubuntu/dr-data
echo "DR Drill Test - Region A" > /home/ubuntu/dr-data/test.txt
dd if=/dev/urandom of=/home/ubuntu/dr-data/sample.bin bs=1M count=10

---

Step 5 : Verify Data Creation

Run inside Primary VM

ls -lh /home/ubuntu/dr-data/

Expected Output:

sample.bin  (10MB)
test.txt

7. Phase 3: Prepare SSH Access to Destination Instance (Mumbai region)

---

Step 6 : Exit Primary VM

Run inside Primary VM

exit

---

Step 7: Copy DR SSH Key to Primary VM

Run from Local Laptop

scp -i <PRIMARY_KEY>.pem <DR_KEY>.pem ubuntu@<PRIMARY_PUBLIC_IP>:/home/ubuntu/.ssh/dr-key.pem

---

Step 8: Login Back to Primary VM

ssh -i <PRIMARY_KEY>.pem ubuntu@<PRIMARY_PUBLIC_IP>

---

Step 9: Set Proper Permission

chmod 400 /home/ubuntu/.ssh/dr-key.pem

---

8. Phase 4 : Transfer Data from Primary to Destination Instance

---

Step 10: Execute rsync

Run inside Primary VM

rsync -avz -e "ssh -i /home/ubuntu/.ssh/dr-key.pem -o StrictHostKeyChecking=no" \
/home/ubuntu/dr-data/ ubuntu@<DR_PUBLIC_IP>:/home/ubuntu/dr-data/

Expected Output:

sending incremental file list
created directory /home/ubuntu/dr-data
sample.bin
test.txt

---

9. Phase 5 : Verify Data on DR VM

---

Step 11: Login to Destination Instance( Mumbai region)

Run from Local Laptop

ssh -i <DR_KEY>.pem ubuntu@<DR_PUBLIC_IP>

---

Step 12: Verify Transferred Data

Run on Destination Instance

ls -lh /home/ubuntu/dr-data/
cat /home/ubuntu/dr-data/test.txt

Expected Output:

sample.bin
test.txt
DR Drill Test - Region A