DevOps Interview Series #1
What is AWS NAT Gateway and when is it used?
Imagine your application server is running inside a Private Subnet.
The server needs to:
✅ Download software packages
✅ Install updates
✅ Pull dependencies from the internet
But it should NOT be directly accessible from the internet.
This is where AWS NAT Gateway comes in.
🔹 NAT = Network Address Translation
How it works:
1️⃣ Private instance sends a request to the internet.
2️⃣ NAT Gateway replaces the private source IP with its own public IP.
3️⃣ Internet responds back to the NAT Gateway.
4️⃣ NAT Gateway forwards the response to the original private instance.
💡 Key Point:
NAT Gateway provides OUTBOUND internet access for private subnet resources without exposing them to inbound internet traffic.
📌 Route Table:
0.0.0.0/0 → NAT Gateway
Remember:
Private Subnet Internet Access = NAT Gateway
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