Attach Volume to EC2 Instance

🎯 Objective

Attach an EBS (Elastic Block Store) volume to an EC2 instance and make it usable (mount + persist).

🧠 What is an EBS Volume?

An EBS volume is a network-attached disk for EC2.

Key Features:

🏗️ Architecture

EC2 Instance ←→ EBS Volume

👉 After attaching, you must format + mount it manually.

# 🛠️ Method 1: Attach via AWS Console

📍 Step 1: Create Volume

1. Go to EC2 Dashboard

1. Click Volumes

1. Click Create Volume

1. Configure:

1. Click Create

🔗 Step 2: Attach Volume

1. Select volume

1. Click Actions → Attach Volume

1. Choose:

1. Click Attach

# ⚙️ Method 2: Using AWS CLI

📌 Create Volume

aws ec2 create-volume \
--availability-zone ap-southeast-1a \
--size10 \
--volume-type gp3

📌 Attach Volume

aws ec2 attach-volume \
--volume-id vol-123456 \
--instance-id i-1234567890abcdef0 \
--device /dev/xvdf

# 🔍 Step 3: Verify in EC2 Instance

SSH into instance:

ssh ec2-user@<public-ip>

List disks:

lsblk

👉 You should see:

xvda   → root disk
xvdf   → new volume

# 🧱 Step 4: Format the Volume

👉 Only if it’s a new volume

sudo mkfs-t ext4 /dev/xvdf

# 📂 Step 5: Mount the Volume

Create mount point:

sudomkdir /data

Mount:

sudo mount /dev/xvdf /data

🔍 Verify Mount

df-h

# 💾 Step 6: Make It Persistent (IMPORTANT)

Edit fstab:

sudovi /etc/fstab

Add:

/dev/xvdf   /data   ext4   defaults,nofail   0   2

✅ Test fstab

sudo mount -a

👉 If no error → correct

# ⚠️ Important Notes

# 🚀 Real Use Cases

# 🧪 Example Scenario

👉 Attach volume for logs:

sudomkdir /var/log/app
sudo mount /dev/xvdf /var/log/app

# ⚠️ Common Mistakes

# 🧠 DevOps Insight

👉 Real production flow:

Attach → Format → Mount → Persist (fstab)