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lifecyclehook.yaml
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lifecyclehook.yaml
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Description: >
This template deploys a Lambda Function and Auto Scaling Lifecycle Hook to drain Tasks from your Container Instances when an Instance is selected for Termination in your Auto Scaling Group.
Parameters:
Cluster:
Type: String
Description: Name of ECS Cluster
ECSAutoScalingGroupName:
Type: String
Description: Name of Auto Scaling Group
Resources:
NotificationTopic:
Type: "AWS::SNS::Topic"
Properties:
Subscription:
- Endpoint: !GetAtt
- LifecycleHandlerFunction
- Arn
Protocol: lambda
DependsOn: LifecycleHandlerFunction
InstanceTerminatingHook:
Type: "AWS::AutoScaling::LifecycleHook"
Properties:
AutoScalingGroupName: !Ref ECSAutoScalingGroupName
DefaultResult: ABANDON
HeartbeatTimeout: "900"
LifecycleTransition: "autoscaling:EC2_INSTANCE_TERMINATING"
NotificationTargetARN: !Ref NotificationTopic
RoleARN: !GetAtt
- AutoscalingNotificationRole
- Arn
DependsOn: NotificationTopic
AutoscalingNotificationRole:
Type: "AWS::IAM::Role"
Properties:
AssumeRolePolicyDocument:
Version: 2012-10-17
Statement:
- Effect: Allow
Principal:
Service:
- autoscaling.amazonaws.com
Action:
- "sts:AssumeRole"
ManagedPolicyArns:
- "arn:aws:iam::aws:policy/service-role/AutoScalingNotificationAccessRole"
LambdaExecutionRole:
Type: "AWS::IAM::Role"
Properties:
Policies:
- PolicyName: lambda-inline
PolicyDocument:
Version: 2012-10-17
Statement:
- Effect: Allow
Action:
- "autoscaling:CompleteLifecycleAction"
- "logs:CreateLogGroup"
- "logs:CreateLogStream"
- "logs:PutLogEvents"
- "ec2:DescribeInstances"
- "ec2:DescribeInstanceAttribute"
- "ec2:DescribeInstanceStatus"
- "ec2:DescribeHosts"
- "ecs:ListContainerInstances"
- "ecs:SubmitContainerStateChange"
- "ecs:SubmitTaskStateChange"
- "ecs:DescribeContainerInstances"
- "ecs:UpdateContainerInstancesState"
- "ecs:ListTasks"
- "ecs:DescribeTasks"
- "sns:Publish"
- "sns:ListSubscriptions"
Resource: "*"
AssumeRolePolicyDocument:
Version: 2012-10-17
Statement:
- Effect: Allow
Principal:
Service:
- lambda.amazonaws.com
Action:
- "sts:AssumeRole"
ManagedPolicyArns:
- "arn:aws:iam::aws:policy/service-role/AutoScalingNotificationAccessRole"
LambdaInvokePermission:
Type: "AWS::Lambda::Permission"
Properties:
FunctionName: !Ref LifecycleHandlerFunction
Action: "lambda:InvokeFunction"
Principal: sns.amazonaws.com
SourceArn: !Ref NotificationTopic
LifecycleHandlerFunction:
Type: "AWS::Lambda::Function"
Properties:
Environment:
Variables:
CLUSTER: !Ref Cluster
Code:
ZipFile: !Join
- ""
- - |
import boto3,json,os,time
ec2Client = boto3.client('ec2')
ecsClient = boto3.client('ecs')
autoscalingClient = boto3.client('autoscaling')
snsClient = boto3.client('sns')
lambdaClient = boto3.client('lambda')
def publishSNSMessage(snsMessage,snsTopicArn):
response = snsClient.publish(TopicArn=snsTopicArn,Message=json.dumps(snsMessage),Subject='reinvoking')
def setContainerInstanceStatusToDraining(ecsClusterName,containerInstanceArn):
response = ecsClient.update_container_instances_state(cluster=ecsClusterName,containerInstances=[containerInstanceArn],status='DRAINING')
def tasksRunning(ecsClusterName,ec2InstanceId):
ecsContainerInstances = ecsClient.describe_container_instances(cluster=ecsClusterName,containerInstances=ecsClient.list_container_instances(cluster=ecsClusterName)['containerInstanceArns'])['containerInstances']
for i in ecsContainerInstances:
if i['ec2InstanceId'] == ec2InstanceId:
if i['status'] == 'ACTIVE':
setContainerInstanceStatusToDraining(ecsClusterName,i['containerInstanceArn'])
return 1
if (i['runningTasksCount']>0) or (i['pendingTasksCount']>0):
return 1
return 0
return 2
def lambda_handler(event, context):
ecsClusterName=os.environ['CLUSTER']
snsTopicArn=event['Records'][0]['Sns']['TopicArn']
snsMessage=json.loads(event['Records'][0]['Sns']['Message'])
lifecycleHookName=snsMessage['LifecycleHookName']
lifecycleActionToken=snsMessage['LifecycleActionToken']
asgName=snsMessage['AutoScalingGroupName']
ec2InstanceId=snsMessage['EC2InstanceId']
checkTasks=tasksRunning(ecsClusterName,ec2InstanceId)
if checkTasks==0:
try:
response = autoscalingClient.complete_lifecycle_action(LifecycleHookName=lifecycleHookName,AutoScalingGroupName=asgName,LifecycleActionToken=lifecycleActionToken,LifecycleActionResult='CONTINUE')
except BaseException as e:
print(str(e))
elif checkTasks==1:
time.sleep(5)
publishSNSMessage(snsMessage,snsTopicArn)
Handler: index.lambda_handler
Role: !GetAtt
- LambdaExecutionRole
- Arn
Runtime: python3.6
Timeout: 10