With this new approach, we have the below benefits: IAM Users need to belong to appropriate IAM groups to get access as per the two solutions shown above. Port Forwarding access using Session Manager: Developers temporarily request permission for this when they want to forward development server port to local like using Jupyter Notebook.Remote access using SSM session manager: This is used by most of the developers who do not need Port forwarding.We have two different solutions as per developer requirements: Our development server is now in a private subnet with this new architecture. AWS PrivateLink support for managed nodes without public IP addressesĪnd the best part, Session Manager is completely free of cost (except for the session logs storage cost) Replacing bastion server with AWS Systems Manager Session Manager.Logging and auditing session activity (CloudTrail, S3, CloudWatch Logs, EventBridge, and SNS).Cross-platform support for Windows, Linux, and macOS.One-click access to managed nodes from the console and CLI.No open inbound ports and no need to manage bastion hosts or SSH keys.Centralized access control to managed nodes using IAM policies.Fully auditable logs with node access details while providing end users simple one-click cross-platform access to your managed nodes.ĪWS Session Manager also allows you to comply with corporate policies that require: Session Manager provides secure and auditable node management without the need to open inbound ports, maintain bastion hosts, or manage SSH keys. You can use an interactive one-click browser-based shell or the AWS Command Line Interface ( AWS CLI ). With Session Manager, you can manage your EC2 instances, edge devices, on-premises servers, and virtual machines. Session Manager is a fully managed AWS Systems Manager capability. Why use session manager, and what benefits does it provide? Have to manage the SSH keys when accessing the bastion server over VPN.Whenever the container/bastion-server is updated due to patches or features, then every time, developers need to update their known_hosts file to remove old identification since the remote host has changed.This solution needs to be in a public subnet over the Internet, which might bring risks if not used or set correctly.Even the solution for Manage AWS EC2 SSH access with IAM is now deprecated due to the shift of bastion server to new AWS solutions of SSM session manager and EC2 instance connect.If we create a solution, we will still need to manage it. There is no proper solution for auditing session logs of all developers.We can use this solution for managing AWS EC2 SSH access using IAM → Problems with using this approach Hence the IAM users of every developer are mapped to their respective local system users using IAM SSH keys. Local system users for every developer on the bastion-server are created based on IAM user permissions. Here you can see we have created a corporate VPN whenever a developer tries to access bastion-server, he first needs to connect to the VPN. Example architecture using bastion server And for the server to be accessible using SSH, we need to create and manage SSH keys. Since bastion servers are accessible from the Internet, they need to be added to the public subnet. We usually connect to the bastion server using a corporate VPN to access or debug applications in the private subnet. The traditional way of accessing bastion serversĪ bastion host is a server whose purpose is to provide access to a private network from an external network, such as the Internet.
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