Walkthrough: Use the AWS CLI with Run Command

The following sample walkthrough shows you how to use the AWS CLI to view information about commands and command parameters, how to run commands, and how to view the status of those commands.

Important

Only trusted administrators should be allowed to use Systems Manager pre-configured documents shown in this topic. The commands or scripts specified in Systems Manager documents run with administrative privilege on your instances. If a user has permission to run any of the pre-defined Systems Manager documents (any document that begins with AWS-), then that user also has administrator access to the instance. For all other users, you should create restrictive documents and share them with specific users. For more information about restricting access to Run Command, see Create non-Admin IAM users and groups for Systems Manager.

Step 1: Getting started

You must either have administrator privileges on the instances you want to configure or you must have been granted the appropriate permission in IAM. Also note, this example uses the US East (Ohio) Region (us-east-2). Run Command is currently available in the AWS Regions listed in Systems Manager service endpoints in the Amazon Web Services General Reference. For more information, see Systems Manager prerequisites.

To run commands using the AWS CLI

1. Install and configure the AWS CLI, if you have not already.

   For information, see Install or upgrade AWS command line tools.

2. List all available documents

   This command lists all of the documents available for your account based on IAM permissions.

   aws ssm list-documents

3. Verify that an instance is ready to receive commands

   The output of the following command shows if instances are online.

   Linux

   aws ssm describe-instance-information \
   	--output text --query "InstanceInformationList[*]"

   Windows

   aws ssm describe-instance-information ^
   	--output text --query "InstanceInformationList[*]"

4. Use the following command to view details about a particular instance.

   Note

   To run the commands in this walkthrough, you must replace the instance and command IDs. The command ID is returned as a response to send-command. The instance ID is available from the Amazon EC2 console.

   Linux

   aws ssm describe-instance-information \
   	--instance-information-filter-list key=InstanceIds,valueSet=instance-ID

   Windows

   aws ssm describe-instance-information ^
   	--instance-information-filter-list key=InstanceIds,valueSet=instance-ID

Step 2: Run shell scripts to view resource details

Using Run Command and the AWS-RunShellScript document, you can run any command or script on an EC2 instance as if you were logged on locally.

View the description and available parameters

Use the following command to view a description of the Systems Manager JSON document.

Linux

aws ssm describe-document \
	--name "AWS-RunShellScript" \
	--query "[Document.Name,Document.Description]"

Windows

aws ssm describe-document ^
	--name "AWS-RunShellScript" ^
	--query "[Document.Name,Document.Description]"

Use the following command to view the available parameters and details about those parameters.

Linux

aws ssm describe-document \
	--name "AWS-RunShellScript" \
	--query "Document.Parameters[*]"

Windows

aws ssm describe-document ^
	--name "AWS-RunShellScript" ^
	--query "Document.Parameters[*]"

Step 3: Send simple commands using the AWS-RunShellScript document

Use the following command to get IP information for an instance.

Linux

aws ssm send-command \
	--instance-ids "instance-ID" \
	--document-name "AWS-RunShellScript" \
	--comment "IP config" \
	--parameters commands=ifconfig \
	--output text

Windows

aws ssm send-command ^
	--instance-ids "instance-ID" ^
	--document-name "AWS-RunShellScript" ^
	--comment "IP config" ^
	--parameters commands=ifconfig ^
	--output text

Get command information with response data

The following command uses the Command ID that was returned from the previous command to get the details and response data of the command execution. The system returns the response data if the command completed. If the command execution shows "Pending" or "InProgress" you run this command again to see the response data.

Linux

aws ssm list-command-invocations \
	--command-id $sh-command-id \
	--details

Windows

aws ssm list-command-invocations ^
	--command-id $sh-command-id ^
	--details

Identify user account

The following command displays the default user account running the commands.

Linux

sh_command_id=$(aws ssm send-command \
	--instance-ids "instance-ID" \
	--document-name "AWS-RunShellScript" \
	--comment "Demo run shell script on Linux Instance" \
	--parameters commands=whoami \
	--output text \
	--query "Command.CommandId")

Get command status

The following command uses the Command ID to get the status of the command execution on the instance. This example uses the Command ID that was returned in the previous command.

Linux

aws ssm list-commands \
	--command-id "command-ID"

Windows

aws ssm list-commands ^
	--command-id "command-ID"

Get command details

The following command uses the Command ID from the previous command to get the status of the command execution on a per instance basis.

Linux

aws ssm list-command-invocations \
	--command-id "command-ID" \
	--details

Windows

aws ssm list-command-invocations ^
	--command-id "command-ID" ^
	--details

Get command information with response data for a specific instance

The following command returns the output of the original aws ssm send-command request for a specific instance.

Linux

aws ssm list-command-invocations \
	--instance-id instance-ID \
	--command-id "command-ID" \
	--details

Windows

aws ssm list-command-invocations ^
	--instance-id instance-ID ^
	--command-id "command-ID" ^
	--details

Display Python version

The following command returns the version of Python running on an instance.

Linux

sh_command_id=$(aws ssm send-command \
	--instance-ids "instance-ID" \
	--document-name "AWS-RunShellScript" \
	--comment "Demo run shell script on Linux Instances" \
	--parameters commands='python -V' \
	--output text --query "Command.CommandId") sh -c 'aws ssm list-command-invocations \
	--command-id "$sh_command_id" \
	--details \
	--query "CommandInvocations[].CommandPlugins[].{Status:Status,Output:Output}"' 

Step 4: Run a simple Python script using Run Command

The following command runs a simple Python "Hello World" script using Run Command.

Linux

sh_command_id=$(aws ssm send-command \
	--instance-ids "instance-ID" \
	--document-name "AWS-RunShellScript" \
	--comment "Demo run shell script on Linux Instances" \
	--parameters '{"commands":["#!/usr/bin/python","print \"Hello world from python\""]}' \
	--output text \
	--query "Command.CommandId") sh -c 'aws ssm list-command-invocations \
	--command-id "$sh_command_id" \
	--details \
	--query "CommandInvocations[].CommandPlugins[].{Status:Status,Output:Output}"'

Step 5: Run a Bash script using Run Command

The examples in this section demonstrate how to run the following bash script using Run Command.

For examples of using Run Command to run scripts stored in remote locations, see Running scripts from Amazon S3 and Running scripts from GitHub.

#!/bin/bash
yum -y update
yum install -y ruby
cd /home/ec2-user
curl -O https://aws-codedeploy-us-east-2.s3.amazonaws.com/latest/install
chmod +x ./install
./install auto

This script installs the AWS CodeDeploy agent on Amazon Linux and Red Hat Enterprise Linux (RHEL) instances, as described in Create an Amazon EC2 instance for CodeDeploy in the AWS CodeDeploy User Guide.

The script installs the CodeDeploy agent from an AWS managed Amazon S3 bucket in the US East (Ohio) Region (us-east-2), aws-codedeploy-us-east-2.

Run a bash script in an AWS CLI command

The following sample demonstrates how to include the bash script in a CLI command using the --parameters option.

Linux

aws ssm send-command \
	--document-name "AWS-RunShellScript" \
	--targets '[{"Key":"InstanceIds","Values":["instance-id"]}]' \
	--parameters '{"commands":["#!/bin/bash","yum -y update","yum install -y ruby","cd /home/ec2-user","curl -O https://aws-codedeploy-us-east-2.s3.amazonaws.com/latest/install","chmod +x ./install","./install auto"]}'

Run a bash script in a JSON file

In the following example, the content of the bash script is stored in a JSON file, and the file is included in the command using the --cli-input-json option.

The command:

Linux

aws ssm send-command \
	--document-name "AWS-RunShellScript" \
	--targets "Key=InstanceIds,Values=instance-id" \
	--cli-input-json file://installCodeDeployAgent.json

Windows

aws ssm send-command ^
	--document-name "AWS-RunShellScript" ^
	--targets "Key=InstanceIds,Values=instance-id" ^
	--cli-input-json file://installCodeDeployAgent.json

The contents of the referenced installCodeDeployAgent.json file:

{
    "Parameters": {
        "commands": [
            "#!/bin/bash",
            "yum -y update",
            "yum install -y ruby",
            "cd /home/ec2-user",
            "curl -O https://aws-codedeploy-us-east-2.s3.amazonaws.com/latest/install",
            "chmod +x ./install",
            "./install auto"
        ]
    }
}