Nous voulons créer ScheduledTasks dans AWS ECS via CloudFormation. Existe-t-il un moyen programmatique de créer via boto ou cloudformation?
Pour définir une tâche ECS planifiée dans CloudFormation, vous devez définir une ressource "AWS :: Events :: Rule" avec une tâche ECS comme cible.
"TaskSchedule": {
"Type": "AWS::Events::Rule",
"Properties": {
"Description": "dump data every workday at 10",
"Name": "dump-data",
"ScheduleExpression": "cron(0 10 ? * MON-FRI *)",
"State": "ENABLED",
"Targets": [
{
"Id": "dump-data-ecs-task",
"RoleArn": {
"Fn::GetAtt": ["TaskSchedulerRole", "Arn"]
},
"EcsParameters": {
"TaskDefinitionArn": {
"Ref": "TaskDefinition"
},
"TaskCount": 1
},
"Arn": {
"Fn::GetAtt": ["EcsCluster", "Arn"]
}
}
]
}
}
Troposphère permet désormais de définir ECS
tâche planifiée, vous avez besoin de trois ressources pour cela,
la définition de la tâche:
from troposphere.ecs import (
ContainerDefinition,
TaskDefinition,
)
scheduled_worker_task_definition = TaskDefinition(
"ScheduledWorkerTask",
template=template,
ContainerDefinitions=[
ContainerDefinition(
Name="ScheduledWorker",
Cpu=200,
Memory=300,
Essential=True,
Image="<image>",
EntryPoint=['<entry_point>']
),
],
)
Le rôle pour exécuter la tâche:
from troposphere import iam
run_task_role = iam.Role(
"RunTaskRole",
template=template,
AssumeRolePolicyDocument=dict(Statement=[dict(
Effect="Allow",
Principal=dict(Service=["events.amazonaws.com"]),
Action=["sts:AssumeRole"],
)]),
Path="/",
Policies=[
iam.Policy(
PolicyName="RunTaskPolicy",
PolicyDocument=dict(
Statement=[dict(
Effect="Allow",
Action=[
"ecs:RunTask",
],
Resource=["*"],
Condition=dict(
ArnEquals={
"ecs:cluster": GetAtt(cluster, "Arn"),
}
)
)],
),
),
],
)
La règle d'événement qui planifie la tâche:
from troposphere.events import Rule, Target, EcsParameters
Rule(
"SchedulingRule",
template=template,
Description="My schedule task rule",
State="ENABLED",
ScheduleExpression="rate(30 minutes)",
Targets=[
Target(
Id="ScheduledWorkerTaskDefinitionTarget",
RoleArn=GetAtt(run_task_role, "Arn"),
Arn=GetAtt(cluster, "Arn"),
EcsParameters=EcsParameters(
TaskCount=1,
TaskDefinitionArn=Ref(scheduled_worker_task_definition),
),
),
]
)
Où la sortie JSON
ressemble à:
...
"ScheduledWorkerTask": {
"Condition": "Deploy",
"Properties": {
"ContainerDefinitions": [
{
"Cpu": 200,
"EntryPoint": [
"<entry_point>"
],
"Essential": "true",
"Image": {
"Fn::Join": [
"",
[
{
"Ref": "AWS::AccountId"
},
".dkr.ecr.",
{
"Ref": "AWS::Region"
},
".amazonaws.com/",
{
"Ref": "ApplicationRepository"
},
":",
"<image>"
]
]
},
"Memory": 300,
"Name": "ScheduledWorker"
}
]
},
"Type": "AWS::ECS::TaskDefinition"
},
"SchedulingRule": {
"Properties": {
"Description": "My schedule task rule",
"ScheduleExpression": "rate(30 minutes)",
"State": "ENABLED",
"Targets": [
{
"Arn": {
"Fn::GetAtt": [
"Cluster",
"Arn"
]
},
"EcsParameters": {
"TaskCount": 1,
"TaskDefinitionArn": {
"Ref": "ScheduledWorkerTask"
}
},
"Id": "ScheduledWorkerTaskDefinitionTarget",
"RoleArn": {
"Fn::GetAtt": [
"RunTaskRole",
"Arn"
]
}
}
]
},
"Type": "AWS::Events::Rule"
},
"RunTaskRole": {
"Properties": {
"AssumeRolePolicyDocument": {
"Statement": [
{
"Action": [
"sts:AssumeRole"
],
"Effect": "Allow",
"Principal": {
"Service": [
"events.amazonaws.com"
]
}
}
]
},
"Path": "/",
"Policies": [
{
"PolicyDocument": {
"Statement": [
{
"Action": [
"ecs:RunTask"
],
"Condition": {
"ArnEquals": {
"ecs:cluster": {
"Fn::GetAtt": [
"Cluster",
"Arn"
]
}
}
},
"Effect": "Allow",
"Resource": [
"*"
]
}
]
},
"PolicyName": "RunTaskPolicy"
}
]
},
"Type": "AWS::IAM::Role"
},
...
Plus d'informations sur https://jeanphix.github.io/2017/10/04/ecs-scheduled-cron-task-with-cloudformation/
Vous pouvez le faire avec boto et cloudformation. Si vous le faites avec cloudformation, vous devrez utiliser un ressource personnalisée soutenue par Lambda . Et vous pouvez aussi le faire avec Troposphere.
Exemple de troposphère:
# Read in the code
fname = "lambda_code.py"
try:
with open(fname) as target:
code = target.readlines()
except Exception as e:
print(e)
# Create the custom resource.
CustomResource = template.add_resource(Function(
"CustomResource",
Description="Creates and Runs a Lambda function.",
FunctionName="myFunctionName",
Code=Code(
ZipFile=Join("",code)
),
Runtime="python2.7",
Role=GetAtt("lambaRole","Arn"),
Handler="index.decide_action",
MemorySize='128',
Timeout='10'
))
Quant à la création de tâches dans boto, consultez la Documentation Boto .
Ressources supplémentaires: