Next, create a security group to be applied to your bastion host. Apply this group to all of your private instances that require connectivity. This SG should only accept SSH or RDP inbound requests from your bastion hosts across your Availability Zones (AZ). First, create an SG that will be used to allow bastion connectivity for your existing private instances. Security groups are essential for maintaining tight security and play a big part in making this solution work (you can read more about AWS security groups here).
Here are the basic steps for creating a bastion host for your AWS infrastructure: Instead, I would suggest that you look into hardening your chosen operating system for even tighter security. When designing the bastion host for your AWS infrastructure, you shouldn’t use it for any other purpose, as this could open unnecessary security holes. This diagram shows connectivity flowing from an end user to resources on a private subnet through a bastion host: You may ask yourself, do I need a bastion host in my environment? If you require remote connectivity with your private instances over the public internet, the answer is yes! When properly configured through the use of security groups and Network ACLs (NACLs), the bastion essentially acts as a bridge to your private instances via the internet. Once remote connectivity has been established with the bastion host, it then acts as a ‘jump’ server, allowing you to use SSH or RDP to log in to other instances (within private subnets) deeper within your VPC. What is a bastion host, and do I need one?īastion hosts are instances that sit within your public subnet and are typically accessed using SSH or RDP.
#Aws bastion host vs nat instance how to#
Check out the Securing your VPC using Public and Private Subnets Hands-on Lab to learn how to design a VPC with a public subnet, a private subnet, and a network address translation (NAT) instance in the public subnet. When you’re ready to test yourself, Cloud Academy offers Hands-on Labs that allow you to work directly in a secure, sandboxed environment. This time, we’ll look at strategies to avoid unnecessarily exposing your data on the internet using a bastion host to tighten access to your resources, NAT instances, NAT Gateways, and VPC peering. In part three, we looked at network security at the subnet level. Welcome to part four of my AWS Security overview. Bastion hosts, NAT instances, and VPC peering can help you secure your AWS infrastructure. Effective security requires close control over your data and resources.
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