By integrating with IAM and the EC2 instance metadata available on all EC2 instances, you get a secure way to distribute short-lived keys and control access by IAM policy, it means you replace the key with the IAM policy.īTW, if EC2 Instance Connect has been used recently, you should see records of your users having called this API operation to send their SSH key to the target host in CloudTrail. You maintain the installed user keys, handle rotation, and make sure that the bastion host is always available and, more importantly, secured.ĮC2 Instance Connect offers an alternative to complicated SSH key management strategies. However, running bastion hosts comes with challenges. They provide logging and prevent rogue SSH access by adding an additional layer of network obfuscation. Some organizations also maintain bastion hosts, which help limit network access into hosts by the use of a single jump point. As a result, organizations have to store, share, manage access for different users, and maintain these SSH keys. When connecting to hosts via SSH, SSH key pairs are often used to individually authorize users. The Session Manager sends audit logs to CloudWatch Logs or S3. The EC2 instance needs access to the Internet or a VPC endpoint. The user uses the AWS Management Console or the terminal (AWS CLI and additional plugin required) to start a session via the Systems Manager.Īn agent running on the EC2 instance connects to the Systems Manager’s backend and executes commands on the machine. IAM authorizes to start a session for an EC2 instance (IAM policy). On-premises server and virtual machines for your hybrid environment_Īuthenticates against IAM (IAM user or SSO identity provider). Windows Server 2008 R2 through Windows Server 2016 The following Linux distributions are supported: User can find the audit logs in CloudTrail.ĪWS System Manager – Session Manager is a fully managed AWS System Manager capability that lets you manage your Amazon EC2 instances through an interactive one-click browser-based shell or through the AWS CLI. Log in to EC2 using SSH from the client with SSH. Register the public key with EC2 Instance Connect API (SendSSHPublicKey).ĮC2 Instance Connect saves the public key in Instance Metadata of the target EC2 for 60 seconds.ĮC2 Instance Connect agent on EC2 obtains public key from Instance Metadata and registers with sshd. Generate a public / private key pair on the client. You can use basic SSH/SFTP commands with the Instance Connect CLI. The Instance Connect CLI performs the following three actions in one call : it generates a one-time-use SSH public key, pushes the key to the instance where it remains for 60 seconds, and connects the user to the instance. (Optional)You also can connect to an instance using the EC2 Instance Connect CLI by providing only the instance ID. Navigate to the EC2 instance Console, select Connect. Restrict the permissions to the specific user or group. You need to modify the Your-Region-1 and ACCOUNTID in the policy.Īttach the policy to IAM Group or IAM User. Sudo apt-get install ec2-instance-connectĬonfigure IAM policy for EC2 Instance Connectįor your IAM users to connect to an instance using EC2 Instance Connect, you must grant them permission to push the public key to the instance. Install the EC2 Instance Connect package on your instance.įor Amazon Linux 2, use the yum install command.įor Ubuntu, use the sudo apt-get command to install the. The EC2 Instance Connect CLI provides a similar interface to standard SSH calls, which includes querying EC2 instance information, generating and publishing ephemeral public keys, and establishing an SSH connection through a single command. (Optional) Install the EC2 Instance Connect CLI. As a result, you cannot use Instance Connect. Notes : If you configured the AuthorizedKeysCommand and AuthorizedKeysCommandUser settings for SSH authentication, the EC2 Instance Connect installation will not update them. For other supported Linux distributions, you must set up Instance Connect for every instance that will support using Instance Connect. This is a one-time requirement for each instance.Īmazon Lior later comes preconfigured with EC2 Instance Connect. Locate the private key and verify permissionsĮnsure that the security group associated with your instance allows inbound SSH traffic on port 22 from your IP address.Īt first time, we need to install the Instance Connect on the instance. Verify the general prerequisites for connecting to your instance using SSH.
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