![]() In one of the public subnets, an Amazon Linux 2 demo instance with the latest EC2 Instance Connect installed.A VPC, using the AWS VPC Quick Start, with two public subnets spanning two Availability Zones.If you would also like to allow EC2 Instance Connect CLI to connect to the instance, add a statement in the policy document that allows an ec2:DescribeInstances action.įor testing, I’ve provided an AWS CloudFormation template that sets up the following environment. You can attach this policy to existing users or roles to allow them to use this feature.ĭescription: Policy to use SSH client to connect to an instance using EC2 Instance Connectįn::Sub:arn:aws:ec2:$ If your IAM users or roles are only using the Amazon EC2 console or a Secure Shell (SSH) client to connect to the instance, use the following policy. $ sudo yum install -y ec2-instance-connect You can do so by using the yum install command. To enable connections using EC2 Instance Connect, you need to have an EC2 Instance Connect package installed on your instance. In this blog post, you’ll be using the ec2-instance-connect command in the AWS Command Line Interface (AWS CLI) If you don’t see this command, please upgrade the AWS CLI, before continuing. Before you startįor details on Amazon EC2 Instance Connect, see the Connect Using EC2 Instance Connect documentation. Rather, you can now push keys for the short term and restrict access using familiar AWS Identity and Access Management (IAM) policies. With EC2 Instance Connect, you no longer have to associate a key pair to the instance and do not have to permanently add user keys to authorized keys. To allow multiple individuals access to the bastion host, you either have to share the key pair or add public keys provided by the individuals to authorized keys on the bastion host, adding a management overhead of ensuring that the list of authorized keys is kept up-to-date. Traditionally, the Amazon EC2 bastion host instance is associated with only one key pair for secure access. ![]() This is necessary if you want to connect to your instances using Instance Connect from the Amazon EC2 console. I also demonstrate how you can use an AWS Lambda function to automate your security group configuration to allow access from the published IP address range of the EC2 Instance Connect service. In this post, I cover how you can improve the security of your existing bastion hosts by using Amazon Elastic Compute Cloud (Amazon EC2) Instance Connect. In a previous blog post, I discussed how you can use AWS Systems Manager Session Manager to securely connect to your private instances in your virtual private cloud (VPC) without needing an intermediary bastion host, open ports, or a key pair assigned to the instances.
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