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# Gunakan CloudFormation dengan Managed Service untuk Apache Flink
Latihan berikut menunjukkan cara memulai aplikasi Flink yang dibuat dengan CloudFormation menggunakan fungsi Lambda di tumpukan yang sama.
## Sebelum Anda mulai
Sebelum Anda memulai latihan ini, ikuti langkah-langkah untuk membuat aplikasi Flink menggunakan CloudFormation di [AWS::KinesisAnalytics: :Application](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-kinesis-analyticsapplication.html).
## Tulis fungsi Lambda
[Untuk memulai aplikasi Flink setelah pembuatan atau pembaruan, kami menggunakan kinesisanalyticsv2 start-application API.](https://docs.aws.amazon.com/cli/latest/reference/kinesisanalyticsv2/start-application.html) Panggilan akan dipicu oleh CloudFormation peristiwa setelah pembuatan aplikasi Flink. Kita akan membahas cara mengatur tumpukan untuk memicu fungsi Lambda nanti dalam latihan ini, tetapi pertama-tama kita fokus pada deklarasi fungsi Lambda dan kodenya. Kami menggunakan `Python3.8` runtime dalam contoh ini.
```
StartApplicationLambda:
Type: AWS::Lambda::Function
DependsOn: StartApplicationLambdaRole
Properties:
Description: Starts an application when invoked.
Runtime: python3.8
Role: !GetAtt StartApplicationLambdaRole.Arn
Handler: index.lambda_handler
Timeout: 30
Code:
ZipFile: |
import logging
import cfnresponse
import boto3
logger = logging.getLogger()
logger.setLevel(logging.INFO)
def lambda_handler(event, context):
logger.info('Incoming CFN event {}'.format(event))
try:
application_name = event['ResourceProperties']['ApplicationName']
# filter out events other than Create or Update,
# you can also omit Update in order to start an application on Create only.
if event['RequestType'] not in ["Create", "Update"]:
logger.info('No-op for Application {} because CFN RequestType {} is filtered'.format(application_name, event['RequestType']))
cfnresponse.send(event, context, cfnresponse.SUCCESS, {})
return
# use kinesisanalyticsv2 API to start an application.
client_kda = boto3.client('kinesisanalyticsv2', region_name=event['ResourceProperties']['Region'])
# get application status.
describe_response = client_kda.describe_application(ApplicationName=application_name)
application_status = describe_response['ApplicationDetail']['ApplicationStatus']
# an application can be started from 'READY' status only.
if application_status != 'READY':
logger.info('No-op for Application {} because ApplicationStatus {} is filtered'.format(application_name, application_status))
cfnresponse.send(event, context, cfnresponse.SUCCESS, {})
return
# create RunConfiguration.
run_configuration = {
'ApplicationRestoreConfiguration': {
'ApplicationRestoreType': 'RESTORE_FROM_LATEST_SNAPSHOT',
}
}
logger.info('RunConfiguration for Application {}: {}'.format(application_name, run_configuration))
# this call doesn't wait for an application to transfer to 'RUNNING' state.
client_kda.start_application(ApplicationName=application_name, RunConfiguration=run_configuration)
logger.info('Started Application: {}'.format(application_name))
cfnresponse.send(event, context, cfnresponse.SUCCESS, {})
except Exception as err:
logger.error(err)
cfnresponse.send(event,context, cfnresponse.FAILED, {"Data": str(err)})
```
Dalam kode sebelumnya, Lambda memproses CloudFormation peristiwa yang masuk, menyaring semuanya selain `Create` dan`Update`, mendapatkan status aplikasi dan memulainya jika statusnya. `READY` Untuk mendapatkan status aplikasi, Anda harus membuat peran Lambda, seperti yang ditunjukkan berikut.
## Buat peran Lambda
Anda membuat peran agar Lambda berhasil “berbicara” dengan aplikasi dan menulis log. Peran ini menggunakan kebijakan terkelola default, tetapi Anda mungkin ingin mempersempitnya menjadi menggunakan kebijakan khusus.
```
StartApplicationLambdaRole:
Type: AWS::IAM::Role
DependsOn: TestFlinkApplication
Properties:
Description: A role for lambda to use while interacting with an application.
AssumeRolePolicyDocument:
Version: '2012-10-17 '
Statement:
- Effect: Allow
Principal:
Service:
- lambda.amazonaws.com
Action:
- sts:AssumeRole
ManagedPolicyArns:
- arn:aws:iam::aws:policy/Amazonmanaged-flinkFullAccess
- arn:aws:iam::aws:policy/CloudWatchLogsFullAccess
Path: /
```
Perhatikan bahwa sumber daya Lambda akan dibuat setelah pembuatan aplikasi Flink di tumpukan yang sama karena mereka bergantung padanya.
## Panggil fungsi Lambda
Sekarang yang tersisa hanyalah memanggil fungsi Lambda. Anda melakukan ini dengan menggunakan sumber [daya khusus](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-cfn-customresource.html).
```
StartApplicationLambdaInvoke:
Description: Invokes StartApplicationLambda to start an application.
Type: AWS::CloudFormation::CustomResource
DependsOn: StartApplicationLambda
Version: "1.0"
Properties:
ServiceToken: !GetAtt StartApplicationLambda.Arn
Region: !Ref AWS::Region
ApplicationName: !Ref TestFlinkApplication
```
Ini semua yang Anda butuhkan untuk memulai aplikasi Flink Anda menggunakan Lambda. Anda sekarang siap untuk membuat tumpukan Anda sendiri atau menggunakan contoh lengkap di bawah ini untuk melihat bagaimana semua langkah tersebut bekerja dalam praktik.
## Tinjau contoh yang diperluas
Contoh berikut adalah versi yang sedikit diperpanjang dari langkah-langkah sebelumnya dengan `RunConfiguration` penyesuaian tambahan yang dilakukan melalui [parameter template](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/parameters-section-structure.html). Ini adalah tumpukan kerja untuk Anda coba. Pastikan untuk membaca catatan yang menyertainya:
tumpukan.yaml
```
Description: 'kinesisanalyticsv2 CloudFormation Test Application'
Parameters:
ApplicationRestoreType:
Description: ApplicationRestoreConfiguration option, can be SKIP_RESTORE_FROM_SNAPSHOT, RESTORE_FROM_LATEST_SNAPSHOT or RESTORE_FROM_CUSTOM_SNAPSHOT.
Type: String
Default: SKIP_RESTORE_FROM_SNAPSHOT
AllowedValues: [ SKIP_RESTORE_FROM_SNAPSHOT, RESTORE_FROM_LATEST_SNAPSHOT, RESTORE_FROM_CUSTOM_SNAPSHOT ]
SnapshotName:
Description: ApplicationRestoreConfiguration option, name of a snapshot to restore to, used with RESTORE_FROM_CUSTOM_SNAPSHOT ApplicationRestoreType.
Type: String
Default: ''
AllowNonRestoredState:
Description: FlinkRunConfiguration option, can be true or false.
Default: true
Type: String
AllowedValues: [ true, false ]
CodeContentBucketArn:
Description: ARN of a bucket with application code.
Type: String
CodeContentFileKey:
Description: A jar filename with an application code inside a bucket.
Type: String
Conditions:
IsSnapshotNameEmpty: !Equals [ !Ref SnapshotName, '' ]
Resources:
TestServiceExecutionRole:
Type: AWS::IAM::Role
Properties:
AssumeRolePolicyDocument:
Version: '2012-10-17 '
Statement:
- Effect: Allow
Principal:
Service:
- kinesisanlaytics.amazonaws.com
Action: sts:AssumeRole
ManagedPolicyArns:
- arn:aws:iam::aws:policy/AmazonKinesisFullAccess
- arn:aws:iam::aws:policy/AmazonS3FullAccess
Path: /
InputKinesisStream:
Type: AWS::Kinesis::Stream
Properties:
ShardCount: 1
OutputKinesisStream:
Type: AWS::Kinesis::Stream
Properties:
ShardCount: 1
TestFlinkApplication:
Type: 'AWS::kinesisanalyticsv2::Application'
Properties:
ApplicationName: 'CFNTestFlinkApplication'
ApplicationDescription: 'Test Flink Application'
RuntimeEnvironment: 'FLINK-1_18'
ServiceExecutionRole: !GetAtt TestServiceExecutionRole.Arn
ApplicationConfiguration:
EnvironmentProperties:
PropertyGroups:
- PropertyGroupId: 'KinesisStreams'
PropertyMap:
INPUT_STREAM_NAME: !Ref InputKinesisStream
OUTPUT_STREAM_NAME: !Ref OutputKinesisStream
AWS_REGION: !Ref AWS::Region
FlinkApplicationConfiguration:
CheckpointConfiguration:
ConfigurationType: 'CUSTOM'
CheckpointingEnabled: True
CheckpointInterval: 1500
MinPauseBetweenCheckpoints: 500
MonitoringConfiguration:
ConfigurationType: 'CUSTOM'
MetricsLevel: 'APPLICATION'
LogLevel: 'INFO'
ParallelismConfiguration:
ConfigurationType: 'CUSTOM'
Parallelism: 1
ParallelismPerKPU: 1
AutoScalingEnabled: True
ApplicationSnapshotConfiguration:
SnapshotsEnabled: True
ApplicationCodeConfiguration:
CodeContent:
S3ContentLocation:
BucketARN: !Ref CodeContentBucketArn
FileKey: !Ref CodeContentFileKey
CodeContentType: 'ZIPFILE'
StartApplicationLambdaRole:
Type: AWS::IAM::Role
DependsOn: TestFlinkApplication
Properties:
Description: A role for lambda to use while interacting with an application.
AssumeRolePolicyDocument:
Version: '2012-10-17 '
Statement:
- Effect: Allow
Principal:
Service:
- lambda.amazonaws.com
Action:
- sts:AssumeRole
ManagedPolicyArns:
- arn:aws:iam::aws:policy/Amazonmanaged-flinkFullAccess
- arn:aws:iam::aws:policy/CloudWatchLogsFullAccess
Path: /
StartApplicationLambda:
Type: AWS::Lambda::Function
DependsOn: StartApplicationLambdaRole
Properties:
Description: Starts an application when invoked.
Runtime: python3.8
Role: !GetAtt StartApplicationLambdaRole.Arn
Handler: index.lambda_handler
Timeout: 30
Code:
ZipFile: |
import logging
import cfnresponse
import boto3
logger = logging.getLogger()
logger.setLevel(logging.INFO)
def lambda_handler(event, context):
logger.info('Incoming CFN event {}'.format(event))
try:
application_name = event['ResourceProperties']['ApplicationName']
# filter out events other than Create or Update,
# you can also omit Update in order to start an application on Create only.
if event['RequestType'] not in ["Create", "Update"]:
logger.info('No-op for Application {} because CFN RequestType {} is filtered'.format(application_name, event['RequestType']))
cfnresponse.send(event, context, cfnresponse.SUCCESS, {})
return
# use kinesisanalyticsv2 API to start an application.
client_kda = boto3.client('kinesisanalyticsv2', region_name=event['ResourceProperties']['Region'])
# get application status.
describe_response = client_kda.describe_application(ApplicationName=application_name)
application_status = describe_response['ApplicationDetail']['ApplicationStatus']
# an application can be started from 'READY' status only.
if application_status != 'READY':
logger.info('No-op for Application {} because ApplicationStatus {} is filtered'.format(application_name, application_status))
cfnresponse.send(event, context, cfnresponse.SUCCESS, {})
return
# create RunConfiguration from passed parameters.
run_configuration = {
'FlinkRunConfiguration': {
'AllowNonRestoredState': event['ResourceProperties']['AllowNonRestoredState'] == 'true'
},
'ApplicationRestoreConfiguration': {
'ApplicationRestoreType': event['ResourceProperties']['ApplicationRestoreType'],
}
}
# add SnapshotName to RunConfiguration if specified.
if event['ResourceProperties']['SnapshotName'] != '':
run_configuration['ApplicationRestoreConfiguration']['SnapshotName'] = event['ResourceProperties']['SnapshotName']
logger.info('RunConfiguration for Application {}: {}'.format(application_name, run_configuration))
# this call doesn't wait for an application to transfer to 'RUNNING' state.
client_kda.start_application(ApplicationName=application_name, RunConfiguration=run_configuration)
logger.info('Started Application: {}'.format(application_name))
cfnresponse.send(event, context, cfnresponse.SUCCESS, {})
except Exception as err:
logger.error(err)
cfnresponse.send(event,context, cfnresponse.FAILED, {"Data": str(err)})
StartApplicationLambdaInvoke:
Description: Invokes StartApplicationLambda to start an application.
Type: AWS::CloudFormation::CustomResource
DependsOn: StartApplicationLambda
Version: "1.0"
Properties:
ServiceToken: !GetAtt StartApplicationLambda.Arn
Region: !Ref AWS::Region
ApplicationName: !Ref TestFlinkApplication
ApplicationRestoreType: !Ref ApplicationRestoreType
SnapshotName: !Ref SnapshotName
AllowNonRestoredState: !Ref AllowNonRestoredState
```
Sekali lagi, Anda mungkin ingin menyesuaikan peran untuk Lambda serta aplikasi itu sendiri.
Sebelum membuat tumpukan di atas, jangan lupa untuk menentukan parameter Anda.
parameters.json
```
[
{
"ParameterKey": "CodeContentBucketArn",
"ParameterValue": "YOUR_BUCKET_ARN"
},
{
"ParameterKey": "CodeContentFileKey",
"ParameterValue": "YOUR_JAR"
},
{
"ParameterKey": "ApplicationRestoreType",
"ParameterValue": "SKIP_RESTORE_FROM_SNAPSHOT"
},
{
"ParameterKey": "AllowNonRestoredState",
"ParameterValue": "true"
}
]
```
Ganti `YOUR_BUCKET_ARN` dan `YOUR_JAR` dengan kebutuhan spesifik Anda. Anda dapat mengikuti [panduan](https://docs.aws.amazon.com/managed-flink/latest/java/get-started-exercise.html) ini untuk membuat ember Amazon S3 dan toples aplikasi.
Sekarang buat tumpukan (ganti YOUR\_REGION dengan wilayah pilihan Anda, misalnya us-east-1):
```
aws cloudformation create-stack --region YOUR_REGION --template-body "file://stack.yaml" --parameters "file://parameters.json" --stack-name "TestManaged Service for Apache FlinkStack" --capabilities CAPABILITY_NAMED_IAM
```
Anda sekarang dapat menavigasi ke [https://console.aws.amazon.com/cloudformation](https://console.aws.amazon.com/cloudformation)dan melihat kemajuannya. Setelah dibuat, Anda akan melihat aplikasi Flink Anda dalam `Starting` keadaan. Mungkin perlu beberapa menit sampai dimulai`Running`.
Untuk informasi selengkapnya, lihat berikut ini:
+ [Empat cara untuk mengambil properti AWS layanan apa pun menggunakan AWS CloudFormation (Bagian 1 dari 3)](https://aws.amazon.com/blogs/mt/four-ways-to-retrieve-any-aws-service-property-using-aws-cloudformation-part-1/).
+ [Panduan: Mencari ID Gambar Mesin Amazon](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/walkthrough-custom-resources-lambda-lookup-amiids.html).