Usa le azioni AWS FIS aws:ecs:task

Puoi utilizzare le azioni aws:ecs:task per inserire errori nelle tue attività Amazon ECS. Sono supportati EC2 i tipi di capacità Amazon e Fargate.

Queste azioni utilizzano documenti AWS Systems Manager (SSM) per inserire errori. Per utilizzare aws:ecs:task le azioni, dovrai aggiungere un contenitore con un agente SSM alla definizione del task Amazon Elastic Container Service (Amazon ECS). Il contenitore esegue uno script definito dal AWS FIS che registra l'attività Amazon ECS come istanza gestita nel servizio SSM. Inoltre, lo script recupera i metadati delle attività per aggiungere tag all'istanza gestita. La configurazione consentirà a AWS FIS di risolvere il task di destinazione. Questo paragrafo si riferisce alla configurazione riportata nel diagramma seguente.

Quando esegui un targeting di un esperimento AWS FISaws:ecs:task, AWS FIS mappa le attività Amazon ECS di destinazione specificate in un modello di esperimento AWS FIS a un set di istanze gestite SSM utilizzando un tag di risorsa,. ECS_TASK_ARN Il valore del tag è l'ARN del task Amazon ECS associato in cui devono essere eseguiti i documenti SSM. Questo paragrafo si riferisce alla Fault Injection nel diagramma seguente.

Il diagramma seguente esemplifica la configurazione e l'iniezione dei guasti in un'operazione con un contenitore esistente.

Operazioni

Limitazioni

Requisiti

Versione di riferimento dello script

Di seguito è riportata una versione più leggibile dello script nella sezione Requisiti, come riferimento.

#!/usr/bin/env bash

# This is the activation script used to register ECS tasks as Managed Instances in SSM
# The script retrieves information form the ECS task metadata endpoint to add three tags to the Managed Instance
#  - ECS_TASK_AVAILABILITY_ZONE: To allow customers to target Managed Instances / Tasks in a specific Availability Zone
#  - ECS_TASK_ARN: To allow customers to target Managed Instances / Tasks by using the Task ARN
#  - FAULT_INJECTION_SIDECAR: To make it clear that the tasks were registered as managed instance for fault injection purposes. Value is always 'true'.
# The script will leave the SSM Agent running in the background
# When the container running this script receives a SIGTERM or SIGINT signal, it will do the following cleanup:
#  - Delete SSM activation
#  - Deregister SSM managed instance

set -e # stop execution instantly as a query exits while having a non-zero

dnf upgrade -y
dnf install jq procps awscli -y

term_handler() {
  echo "Deleting SSM activation $ACTIVATION_ID"
  if ! aws ssm delete-activation --activation-id $ACTIVATION_ID --region $ECS_TASK_REGION; then
    echo "SSM activation $ACTIVATION_ID failed to be deleted" 1>&2
  fi

  MANAGED_INSTANCE_ID=$(jq -e -r .ManagedInstanceID /var/lib/amazon/ssm/registration)
  echo "Deregistering SSM Managed Instance $MANAGED_INSTANCE_ID"
  if ! aws ssm deregister-managed-instance --instance-id $MANAGED_INSTANCE_ID --region $ECS_TASK_REGION; then
    echo "SSM Managed Instance $MANAGED_INSTANCE_ID failed to be deregistered" 1>&2
  fi

  kill -SIGTERM $SSM_AGENT_PID
}
trap term_handler SIGTERM SIGINT

# check if the required IAM role is provided
if [[ -z $MANAGED_INSTANCE_ROLE_NAME ]] ; then
  echo "Environment variable MANAGED_INSTANCE_ROLE_NAME not set, exiting" 1>&2
  exit 1
fi

# check if the agent is already running (it will be if ECS Exec is enabled)
if ! ps ax | grep amazon-ssm-agent | grep -v grep > /dev/null; then

  # check if ECS Container Metadata is available
  if [[ -n $ECS_CONTAINER_METADATA_URI_V4 ]] ; then

    # Retrieve info from ECS task metadata endpoint
    echo "Found ECS Container Metadata, running activation with metadata"
    TASK_METADATA=$(curl "${ECS_CONTAINER_METADATA_URI_V4}/task")
    ECS_TASK_AVAILABILITY_ZONE=$(echo $TASK_METADATA | jq -e -r '.AvailabilityZone')
    ECS_TASK_ARN=$(echo $TASK_METADATA | jq -e -r '.TaskARN')
    ECS_TASK_REGION=$(echo $ECS_TASK_AVAILABILITY_ZONE | sed 's/.$//')

    # validate ECS_TASK_AVAILABILITY_ZONE
    ECS_TASK_AVAILABILITY_ZONE_REGEX='^(af|ap|ca|cn|eu|me|sa|us|us-gov)-(central|north|(north(east|west))|south|south(east|west)|east|west)-[0-9]{1}[a-z]{1}$'
    if ! [[ $ECS_TASK_AVAILABILITY_ZONE =~ $ECS_TASK_AVAILABILITY_ZONE_REGEX ]] ; then
      echo "Error extracting Availability Zone from ECS Container Metadata, exiting" 1>&2
      exit 1
    fi

    # validate ECS_TASK_ARN
    ECS_TASK_ARN_REGEX='^arn:(aws|aws-cn|aws-us-gov):ecs:[a-z0-9-]+:[0-9]{12}:task/[a-zA-Z0-9_-]+/[a-zA-Z0-9]+$'
    if ! [[ $ECS_TASK_ARN =~ $ECS_TASK_ARN_REGEX ]] ; then
      echo "Error extracting Task ARN from ECS Container Metadata, exiting" 1>&2
      exit 1
    fi

    # Create activation tagging with Availability Zone and Task ARN
    CREATE_ACTIVATION_OUTPUT=$(aws ssm create-activation \
      --iam-role $MANAGED_INSTANCE_ROLE_NAME \
      --tags Key=ECS_TASK_AVAILABILITY_ZONE,Value=$ECS_TASK_AVAILABILITY_ZONE Key=ECS_TASK_ARN,Value=$ECS_TASK_ARN Key=FAULT_INJECTION_SIDECAR,Value=true \
      --region $ECS_TASK_REGION)

    ACTIVATION_CODE=$(echo $CREATE_ACTIVATION_OUTPUT | jq -e -r .ActivationCode)
    ACTIVATION_ID=$(echo $CREATE_ACTIVATION_OUTPUT | jq -e -r .ActivationId)

    # Register with AWS Systems Manager (SSM)
    if ! amazon-ssm-agent -register -code $ACTIVATION_CODE -id $ACTIVATION_ID -region $ECS_TASK_REGION; then
      echo "Failed to register with AWS Systems Manager (SSM), exiting" 1>&2
      exit 1
    fi

    # the agent needs to run in the background, otherwise the trapped signal
    # won't execute the attached function until this process finishes
    amazon-ssm-agent &
    SSM_AGENT_PID=$!

    # need to keep the script alive, otherwise the container will terminate
    wait $SSM_AGENT_PID

  else
    echo "ECS Container Metadata not found, exiting" 1>&2
    exit 1
  fi

else
  echo "SSM agent is already running, exiting" 1>&2
  exit 1
fi

Esempio di modello di esperimento

Di seguito è riportato un esempio di modello di esperimento per l'aws:ecs:task-cpu-stressazione.

{
    "description": "Run CPU stress on the target ECS tasks",
    "targets": {
        "myTasks": {
            "resourceType": "aws:ecs:task",
            "resourceArns": [
                "arn:aws:ecs:us-east-1:111122223333:task/my-cluster/09821742c0e24250b187dfed8EXAMPLE"
            ],
            "selectionMode": "ALL"
        }
    },
    "actions": {
        "EcsTask-cpu-stress": {
            "actionId": "aws:ecs:task-cpu-stress",
            "parameters": {
                "duration": "PT1M"
            },
            "targets": {
                "Tasks": "myTasks"
            }
        }
    },
    "stopConditions": [
        {
            "source": "none",
        }
    ],
    "roleArn": "arn:aws:iam::111122223333:role/fis-experiment-role",
    "tags": {}
}