![]() The aws ssm start-session CLI command requires that you install the Session Manager plugin for AWS CLI, as described here.Ensure you have AWS credentials in your environment, either from ~/.aws/credentials or as exported Bash environment variables.Since we’re using AWS CLI in the background: ![]() You can now SSH to the instance using: ssh Prerequisites filter Name=private-ip-address,Values="$1" \ Now in the ~/.ssh/ssm.sh file, use the AWS CLI to establish an SSM session to the instance: #!/usr/bin/env bash There has to be a better, simpler way! □ SSH Over SSM!Īs it turns out, it’s fairly easy to configure the SSH command on your terminal to use SSM behind the scenes! Once configured, everyone using SSH from this machine would use SSM automatically, including Ansible, Terraform, Packer, etc.įirst, configure ~/.ssh/config to proxy all your SSH commands to a script we provide: # SSH over SSM All this is too cumbersome & difficult to maintain at scale. The alternative would be to open up the SSH port on security groups & connect to them using SSH private keys via either a bastion host (jump box) or a VPN connectivity to the VPCs. Session Manage is great, but what if you have a real need to use SSH? In our case, we wanted to run Ansible playbooks on several private instances at once & since Ansible tries SSH connection to the instances, it would be great if we could somehow use the machine’s local SSH client with SSM. ![]() AWS Systems Manager User Guide Still Need SSH? 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 either an interactive one-click browser-based shell or the AWS Command Line Interface (AWS CLI). With Session Manager, you can manage your Amazon Elastic Compute Cloud (Amazon EC2) instances, edge devices, and on-premises servers and virtual machines (VMs). Session Manager is a fully managed AWS Systems Manager capability. One of the routine activities you will end up doing several times a day when working with EC2 instances, is connecting to a terminal on your instances.įor security reasons, none of our security groups have the SSH port open, and most of the instances are in private subnets anyway.ĪWS Systems Manager Session Manager is a great way to connect to your instances, especially in such restricted environments. If this is the case, then update the SSM agent on the EC2 instance.We here at QloudX manage hundreds of Amazon EC2 instances for our clients. In the above, you’ll see it never actually tries to authenticate you based on the key you’ve provided. $ ssh -vvv -i key -l ec2-user i-0b3fb981ffde2c5d3ĭebug1: Reading configuration data /Users/user/.ssh/configĭebug1: /Users/user/.ssh/config line 34: Skipping Host block because of negated match for i-*ĭebug1: /Users/user/.ssh/config line 57: Applying options for i-*ĭebug1: Reading configuration data /etc/ssh/ssh_configĭebug1: /etc/ssh/ssh_config line 48: Applying options for *ĭebug1: Executing proxy command: exec sh -c "aws ssm start-session -target i-0b3fb981ffde2c5d3 -document-name AWS-StartSSHSession -parameters 'portNumber=22'"ĭebug1: identity file /Users/user/.ssh/id_rsa type 0ĭebug1: identity file /Users/user/.ssh/id_rsa-cert type -1ĭebug1: Local version string SSH-2.0-OpenSSH_7.9ĭebug1: ssh_exchange_identification: Starting session with SessionId: userĭebug1: ssh_exchange_identification: \033[?1034hsh-4.2$ĭebug1: ssh_exchange_identification: sh: SSH-2.0-OpenSSH_7.9: command not foundĭebug1: ssh_exchange_identification: sh-4.2$
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