[AWS] Systems Manager

Systems Manager (formerly known as SSM) manages EC2 instances at scale (EC2 fleet).


  • Systems Manager organizes and groups your EC2 instances.
  • Automates common tasks such as patching, running scripts, and installing applications.
  • An agent software is installed on each VM.

Systems Manager Run Command

Run Commands” allows you to run operational tasks across multiple EC2 instances.

  • Run commands or scripts on one or more EC2 instances using Resource groups.
  • Stop, start, re-size, or terminate instances.
  • Install, patch, or uninstall software.

Systems Manager Parameter Store

Parameter Store provides secure serverless storage for the management of configuration data and secrets.


  • You can store confidential data such as passwords, database strings, and license codes as parameter values.
  • Values can be saved as plain text or encrypted values (using the key from KMS).
  • Parameters are stored in hierarchies.
    • e.g. /prod/db/aurora/connection, /dev/db/aurora/connection
  • The service can be used with EC2, ECS, or Lambda.


  • Standard
    • up to 10,000 parameters
    • up to 4KB parameter value size
    • No parameter policies
    • No charge
  • Advanced
    • more than 10,000 parameters
    • up to 8KB parameter value size
    • parameter polices are available
    • Charges apply


  • String
    • Any string value
  • StringList
    • a comma-separated list of strings
  • SecureString
    • Encrypted string using KMS keys from your account or another account

Example: Systems Manager Patch Manager

  1. Create an IAM role
    • Trusted Entity: EC2
    • Managed Policy: AmazonSSMManagedInstanceCore
  1. Launch EC2 instances – 2 or more
    • Attach the role
    • Provide a tag to group instances later
  1. Open the Systems Manager Console
    • You can find instances in the Fleet Manager section.
    • If you do not see the instances, please check the attached IAM role in the EC2 instances.
  2. Create a resource group
    • Search and select the service “Resource Groups & Tag Editor
    • Create a resource group based on a tag
  1. Use Patch Manager in the Systems Manager
    • Search the baseline and set it as the default
  1. Use Patch Manager – Patch Now
    • You can schedule the patch or patch now.
    • You can select target instances using instance tags or a resource group.
    • Install any missing patches

Example: Systems Manager Run Command

  1. Setup an IAM role with AmazonSSMManagedInstanceCore
  2. Launch EC2 instances – 2 or more
  3. Create a resource group
  4. Run Command
    • Select the Command document
    • For your custom action, you can select “AWS-RunShellScript
    • Type the commands in the Command parameters
    • Select your target using the resource group
    • You can save the output in S3 or set up the SNS notification.
  1. Run the command
  2. You can confirm the output in Management Console.

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