SSM requires an instance profile role that should be associated with each EC2 instances. Because the agent always starts the communication, allow any inbound rules is not necessary. SSM agent needs communication with the AWS API, this communication uses standard HTTPS ports. SSM agent should be installed in every Ec2 instances or on-premise machine with Administrative access. (Exception port-forwarding action logs will not be Pushed to cloudwatch logs and s3 bucket) Full support for logging and auditing features in AWS (CloudTrail, S3, CloudWatch logs).Command outputs can be forwarded to CloudWatch logs and generate alerts as response for undesired behavior.Logs include the executed command, outputs, time when the command was executed and more. Sessions are logged based on the IAM user.Deploy and manage ssh-keys for EC2 instances is not necessary.Jump or Bastion host can be removed to improve security and save cost.Open inbound SSH connection port for EC2 instances is no longer needed.Centralization of access to EC2 instances and granular control over who can start sessions on specific instances.Session manager can leverage multi-factor authentication (by enforcing IAM policies).Systems Manager components are reliable and highly available (AWS Console, AWS CLI, SSM endpoints).Optional: Session outputs can be forwarded to CloudWatch logs and/or S3 buckets (Exception port-forwarding action logs will not be Pushed to cloudwatch logs and s3 bucket). Any action performed over session manager is logged on CloudTrail.An agent running on each EC2 instance connects to then System Manager endpoints and executes the command over the instances.If authentication is successful, SSM session manager is accessible by the AWS Management Console or AWS CLI (requires session manager CLI plugin).Admin users are authenticated through IAM roles and policies.Session Manager also makes it easy to comply with corporate policies that require controlled access to instances, strict security practices, and fully auditable logs with instance access details, while still providing end users with simple one-click cross-platform access to your Amazon EC2 instances. Session Manager provides secure and auditable instance management without the need to open inbound ports, maintain bastion hosts, or manage SSH keys. Session Manager allows you to manage and control your instances through a one click browser-based shell or through the AWS CLI without the need to use bastion hosts or manage SSH keys, providing an easy, secure and no frills approach in logging into your instances.Session Manager is a fully managed AWS Systems Manager capability that lets you manage your Amazon EC2 instances through an interactive one-click browser-based shell or through the AWS CLI. Depending on your operating system, the installation process is a bit different but AWS provides more than enough comprehensive documentation to guide one here. If working with EC2, it comes installed by default in Amazon’s Linux AMI as well as Ubuntu Server AMIs. It comes with a variety of features such as the parameter store for storing secure data such as DB credentials for your applications and the Session Manager which is the focus of today’s article How does Systems Manager Work?įor Systems Manager to work, you need to install the SSM agent onto the systems or instances we intend to control. It’s quite admittedly, a must-know service for any cloud systems admin. It allows you to group and perform actions on a group of instances such as patch and change automation, compliance enforcement, and monitoring. It can be used both on EC2 instances and on-prem. AWS Systems Manager: A brief overviewįormerly Known as SSM, systems manager is a service offering(that's free!)by AWS used to view and control your infrastructure on AWS. That's how we came to know of AWS Systems Manager and Session Manager, one of System Manager’s features that frankly, I think more people should know about. In the past week, we’ve been looking at how to effectively manage our instances at scale and run various actions simultaneously for a particular set of instances. AWS has numerous services that we may not all know or be aware of.
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