I have completed the task successfully , still getting error that private route table is not associated with 0.0.0.0/0 to NAT gateway even though I associated

durganaresh1742 · February 23, 2026, 2:12am

Day 30: Enable Internet Access for Private EC2 using NAT Instance

I followed the question and updated but still i am getting an error. Even though the job will run automatically to the S3 bucket, I got an error that the private route table is not associated with the NAT gateway even though I associated

raymond.baoly · February 23, 2026, 7:10am

Hi @durganaresh1742

Please refer to the solution below and try again.

github.com

Srikanth0824/kodekloud-engineer/blob/main/100_Days_of_Cloud-AWS/Day30.md

## Task: Enable Internet Access for Private EC2 using NAT Instance
The Nautilus DevOps team is tasked with enabling internet access for an EC2 instance running in a private subnet. This instance should be able to upload a test file to a public S3 bucket once it can access the internet. To minimize costs, the team has decided to use a NAT Instance instead of a NAT Gateway.

The following components already exist in the environment:
1. A VPC named `xfusion-priv-vpc` and a private subnet named `xfusion-priv-subnet` have been created.
2. An EC2 instance named `xfusion-priv-ec2` is already running in the private subnet.
3. The EC2 instance is configured with a cron job that uploads a test file to the S3 bucket `xfusion-nat-31533` every minute. Upload will only succeed once internet access is established.

Your task is to:
- Create a new public subnet named `xfusion-pub-subnet` in the existing VPC.
- Launch a NAT Instance in the public subnet using an Amazon Linux 2 AMI and name it `xfusion-nat-instance`. Configure this instance to act as a NAT instance. Make sure to use a custom security group for this instance.

After the configuration, verify that the test file `xfusion-test.txt` appears in the S3 bucket `xfusion-nat-31533`. This indicates successful internet access from the private EC2 instance via the NAT Instance.

---

## Solution

### Step 1: Set Variables
```bash

This file has been truncated. show original

durganaresh1742 · February 24, 2026, 5:35am

Hi @ raymond.baoly

As per the github repo you provided, i have followed the same for today but cron job is not happened. But yesterday everything works but failed I am not sure where exactly it denying the connection.

Followed

Srikanth0824/kodekloud-engineer/blob/main/100_Days_of_Cloud-AWS/Day30.md

durganaresh1742 · February 25, 2026, 5:55am

Today also I have followed the same to enable Internet access using the NAT instance, but still the job is not running to upload the file to the S3 bucket.

First created the Subnet with devops-pub-subnet with a private VPC and Enable auto-assign public IPv4 address, and also attached the IGW with the VPC.
created the public route table associated with public subnet
created security group while allowing all traffic with private subnet CIDR and SSH
Created the EC2 instance devops-nat-instance and disabled the source and destination
add the IP tables on the NAT instance following the doc

Attached the Nat Instance to private route table associate with private subnet

Not sure where exactly the internet access is blocking for S3 bucket to run cron job

Please, anyone, help me to finish this task; it will be very help to understand and learn if I am missed any part

raymond.baoly · February 25, 2026, 8:15am

Hi @durganaresh1742

I’ve just checked and it seems the solution is missing the update to the route table. Because of this, the private instance cannot access the NAT instance. The private route table should include a route to the internet through the NAT instance.

durganaresh1742 · February 27, 2026, 11:30am

Thank you for sharing the solution. I have tried that; while generating through CLI, it works, but the manual way is failing with the NAT connectivity.

Thank you once again for completing the task. Day 30