How do you make sure that an EC2 instance in a subnet can access the internet in a custom VPC?

Question

Mahesh B · Accepted Answer

Steps to Ensure Internet Access for an EC2 Instance in a Custom VPC 1. Attach an Internet Gateway to the VPC: Create an Internet Gateway (IGW) and attach it to your VPC. This allows your VPC to communicate with the internet. 2. Update the Route Table for the Subnet: Modify the route table associated with the subnet where the EC2 instance resides. Add a route for 0.0.0.0/0 that points to the Internet Gateway. This configuration designates the subnet as a public subnet, enabling instances within it to access the internet. 3. Assign a Public IP Address to the EC2 Instance: Ensure that the EC2 instance is assigned a public IP address. This can be done during instance launch by selecting the option to "Auto-assign Public IP" or by associating an Elastic IP after the instance is running. 4. Configure the Security Group: Check the security group associated with the EC2 instance to ensure it allows outbound traffic to the internet.

kareemullah shaik · Answer

To enable internet access for an EC2 instance in a custom VPC subnet, you need to: Have an Internet Gateway attached to the VPC. Have a route in the subnet's route table pointing internet-bound traffic to the IGW.   Ensure the instance has a public IP address (either auto-assigned or an Elastic IP). Configure the instance's Security Group to allow necessary inbound and outbound internet traffic.

How do you make sure that an EC2 instance in a subnet can access the internet in a custom VPC?

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