# 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
```

<figure><img src="/files/zAXlCOrw6df8ycOFz321" alt=""><figcaption></figcaption></figure>

***

**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
```

<figure><img src="/files/F27NXwrJwFGJXjgMKvCR" alt=""><figcaption></figcaption></figure>

***

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
```

<figure><img src="/files/f6OAGnxVSG0Bw4PVIuJv" alt=""><figcaption></figcaption></figure>

***

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
```

<figure><img src="/files/cmzK9ncGlfHHxEvPhpcA" alt=""><figcaption></figcaption></figure>

***

**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
```

<figure><img src="/files/PgHbPqPcyOyBPey9qhG7" alt=""><figcaption></figcaption></figure>


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