Systems Manager (SSM)

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Systems Manager can be used in conjunction with the EC2 Docker backend to run operational tasks on the Dockerised instances.

The following table highlights some differences between LocalStack SSM and AWS SSM.

LocalStack	AWS
Instances are automatically registered with SSM	Instances are manually registered using `CreateActivation`
Uses Docker exec to perform operations	Uses Amazon SSM Agent
Instance IDs are prefixed with `i-`	Instance IDs are prefixed with `mi-`

Following operations are currently supported:

Operation	Notes
DescribeInstanceInformation	List all registered instances
SendCommand	Currently only `AWS-RunShellScript` document is supported
ListCommandInvocations	List all invocations
GetCommandInvocation	Details of an invocation including standard output and standard error contents

Examples

$ awslocal ssm send-command --document-name "AWS-RunShellScript" \
    --document-version "1" \
    --instance-ids i-04df0c15 \
    --parameters "commands='cat ./uptime',workingDirectory=/proc"
{
    "Command": {
        "CommandId": "e53e67c3-a8f2-419e-87e4-e596880797e8",
        "DocumentName": "AWS-RunShellScript",
        "DocumentVersion": "1",
        "InstanceIds": [
            "i-04df0c15"
        ],
        "Status": "InProgress"
    }
}

$ awslocal ssm get-command-invocation \
    --command-id a0105ed1-0a4d-423b-9a64-9a49828f5391 \
    --instance-id i-04df0c15
{
    "CommandId": "a0105ed1-0a4d-423b-9a64-9a49828f5391",
    "InstanceId": "i-04df0c15",
    "DocumentName": "AWS-RunShellScript",
    "DocumentVersion": "1",
    "Status": "Success",
    "StandardOutputContent": "1066081.29 510156.74\n",
    "StandardErrorContent": ""
}

Limitations

Only AWS-RunShellScript is supported for Dockerised instances.
If the command returns a non-zero code, the standard output and standard error streams are not captured and will be empty.
Shell constructs like job controls (&&, ||), redirection (>) etc. are not supported.

Last modified December 1, 2022: LocalStack Beta Docs (#337) (28576f899)