在不允许AWSEBCloudwatchAlarmHigh空值的情况下，aws弹性豆柄不能创建缩放触发器失败

Question

当我试图指定一个缩放触发器时，它总是用

Service:AmazonCloudFormation, Message:[/Resources/AWSEBCloudwatchAlarmHigh/Type/Dimensions/0/Value/Fn::GetAtt/0] 'null' values are not allowed in templates

我有一个保存的模板，我正在尝试添加

aws:autoscaling:trigger:
    BreachDuration: 5
    LowerBreachScaleIncrement: -1
    LowerThreshold: 0.75
    MeasureName: Latency
    Period: 1
    EvaluationPeriods: 1
    Statistic: Average
    Unit: Seconds
    UpperBreachScaleIncrement: 2
    UpperThreshold: 1

所以我创建了它，没有这个，它创建了自动报警。我尝试使用浏览器更新到此设置，但它也失败了。

Service:AmazonCloudFormation, Message:[/Resources/AWSEBCloudwatchAlarmHigh/Type/Dimensions/0/Value/Fn::GetAtt/0] 'null' values are not allowed in templates

这是我保存的模板

Platform:
  PlatformArn: arn:aws:elasticbeanstalk:eu-west-2::platform/Python 3.6 running on 64bit Amazon Linux/2.9.14
OptionSettings:
  aws:elasticbeanstalk:command:
    BatchSize: '30'
    BatchSizeType: Percentage
  AWSEBAutoScalingScaleUpPolicy.aws:autoscaling:trigger:
    UpperBreachScaleIncrement: '2'
  aws:elasticbeanstalk:application:environment:
    DJANGO_SETTINGS_MODULE: domain.settings
    PYTHONPATH: $PYTHONPATH
    ALLOWED_CIDR_NETS: 10.0.0.0/16
    DATABASE_NAME: domainproductionplus
    DATABASE_HOST: domain-production-plus.coz8h02qupfe.eu-west-2.rds.amazonaws.com
    ENVIRONMENT: production
    DATABASE_PORT: '5432'
    EMAIL_BACKEND: django.core.mail.backends.console.EmailBackend
    DEBUG: '0'
    DATABASE_ENGINE: django.db.backends.postgresql_psycopg2
    REDIS_LOCATION: aws-co-qemfpydhs2ly.ubjsxm.0001.euw2.cache.amazonaws.com
    AWS_S3_REGION_NAME: eu-west-2
    ALLOWED_HOSTS: '*'
    VAPID_ADMIN_EMAIL: email@domain.com
    DATABASE_USER: domainprodplus
    AWS_STORAGE_BUCKET_NAME: domain-production-plus
    REDIS_LOCATION_X: domain-production-plus-001.domain-production-plus.ubjsxm.euw2.cache.amazonaws.com
    DATABASE_PASSWORD: '{{resolve:ssm:domain-api-production-plus-DATABASE_PASSWORD:1}}'
    HASHID_SALT: '{{resolve:ssm:domain-api-production-plus-HASHID_SALT:1}}'
    VAPID_PRIVATE_KEY: '{{resolve:ssm:domain-api-production-plus-VAPID_PRIVATE_KEY:1}}'
    VAPID_PUBLIC_KEY: '{{resolve:ssm:domain-api-production-plus-VAPID_PUBLIC_KEY:1}}'
    SECRET_KEY: '{{resolve:ssm:domain-api-production-plus-SECRET_KEY:1}}'
    AWS_SECRET_ACCESS_KEY: '{{resolve:ssm:domain-api-production-plus-AWS_SECRET_ACCESS_KEY:1}}'
  aws:autoscaling:updatepolicy:rollingupdate:
    RollingUpdateType: Health
    RollingUpdateEnabled: true
  aws:elb:policies:
    domainionDrainingEnabled: true
  aws:ec2:instances:
    InstanceTypes: t2.micro
  AWSEBAutoScalingGroup.aws:autoscaling:asg:
    Cooldown: '120'
    MaxSize: '6'
  aws:elasticbeanstalk:container:python:
    WSGIPath: domain/wsgi.py
    StaticFiles: /static/=www/static/
  aws:ec2:vpc:
    VPCId: vpc-0fddefb70e6c8b32a
    Subnets: subnet-04497865d7eb17b70
    AssociatePublicIpAddress: false
  aws:elasticbeanstalk:environment:process:default:
    DeregistrationDelay: 20
    HealthCheckInterval: 15
    HealthCheckPath: /app-version-updates
    HealthCheckTimeout: 5
    HealthyThresholdCount: 3
    MatcherHTTPCode: 200
    Port: 80
    Protocol: HTTP
    StickinessEnabled: false
    StickinessLBCookieDuration: 86400
    StickinessType: lb_cookie
    UnhealthyThresholdCount: 5
  aws:elbv2:listener:80:
    ListenerEnabled: true
    Protocol: HTTP
    Rules: domainapiproductionplus
  aws:elbv2:listener:443:
    ListenerEnabled: true
    SSLCertificateArns: arn:aws:acm:eu-west-2:799479065523:certificate/5fb4f19c-f377-4ef6-8a7a-9657832c0d17
    Protocol: HTTPS
    Rules: domainapiproductionplus
    SSLPolicy: ELBSecurityPolicy-TLS-1-2-2017-01
  aws:elbv2:listenerrule:domainapiproductionplus:
    HostHeaders: api-production-plus.hcidomain.digital
    PathPatterns: /*
    Priority: 2
    process: default
  aws:elb:loadbalancer:
    CrossZone: true
    ManagedSecurityGroup: sg-0ac0850967d4d2929
  aws:elbv2:loadbalancer:
    ManagedSecurityGroup: sg-0ac0850967d4d2929
    SharedLoadBalancer: arn:aws:elasticloadbalancing:eu-west-2:799479065523:loadbalancer/app/domain-production-plus/206b8390c82843a3
  aws:elasticbeanstalk:environment:
    ServiceRole: arn:aws:iam::799479065523:role/aws-elasticbeanstalk-service-role
    LoadBalancerType: application
    LoadBalancerIsShared: true
  aws:autoscaling:launchconfiguration:
    IamInstanceProfile: aws-elasticbeanstalk-ec2-role
    EC2KeyName: domain
    SecurityGroups: sg-0ac0850967d4d2929,sg-095397beca170840e,sg-02f17712a24784d64
    MonitoringInterval: 1 minute
  aws:autoscaling:trigger:
    BreachDuration: 5
    LowerBreachScaleIncrement: -1
    LowerThreshold: 0.75
    MeasureName: Latency
    Period: 1
    EvaluationPeriods: 1
    Statistic: Average
    Unit: Seconds
    UpperBreachScaleIncrement: 2
    UpperThreshold: 1
  aws:elasticbeanstalk:healthreporting:system:
    SystemType: enhanced
EnvironmentTier:
  Type: Standard
  Name: WebServer
AWSConfigurationTemplateVersion: 1.1.0.0
Tags:
  project: domain
  product: domain

我正在使用一个共享负载均衡器，这会是问题吗？使用经典的负载均衡器，它可以很好地设置使用延迟的自动尺度度量。

要从cli创建环境，我将运行。

% eb create domain-api-production-plus --cfg domain-api-production-plus \
--cname domain-api-production-plus \
--elb-type application \
--shared-lb arn:aws:elasticloadbalancing:eu-west-2:799479065523:loadbalancer/app/domain-production-plus/206b8390c82843a3 \
--vpc \
--vpc.ec2subnets subnet-04497865d7eb17b70,subnet-032624d3e62d499f1 \
--vpc.elbsubnets subnet-0b3c3aa9b190a2546,subnet-05453d986413e8ae2 \
--vpc.id vpc-0fddefb70e6c8b32a \
--vpc.securitygroups sg-02f17712a24784d64,sg-095397beca170840e,sg-0ac0850967d4d2929 \
--tags project=domain,Name=domain-api-production-plus \
--service-role aws-elasticbeanstalk-service-role \
--region eu-west-2 \
--platform "arn:aws:elasticbeanstalk:eu-west-2::platform/Python 3.6 running on 64bit Amazon Linux/2.9.14" \
--keyname domain


Do you want to associate a public IP address? (Y/n): n
Do you want the load balancer to be public? (Select no for internal) (Y/n):
Creating application version archive "app-5aac-200929_084247".
Uploading Domain/app-5aac-200929_084247.zip to S3. This may take a while.
Upload Complete.
Environment details for: domain-api-production-plus
  Application name: Domain
  Region: eu-west-2
  Deployed Version: app-5aac-200929_084247
  Environment ID: e-tcwd2awzvs
  Platform: arn:aws:elasticbeanstalk:eu-west-2::platform/Python 3.6 running on 64bit Amazon Linux/2.9.14
  Tier: WebServer-Standard-1.0
  CNAME: domain-api-production-plus.eu-west-2.elasticbeanstalk.com
  Updated: 2020-09-29 07:42:50.765000+00:00
Printing Status:
2020-09-29 07:42:49    INFO    createEnvironment is starting.
2020-09-29 07:42:50    INFO    Using elasticbeanstalk-eu-west-2-799479065523 as Amazon S3 storage bucket for environment data.
2020-09-29 07:42:55    INFO    Created security group named: awseb-AWSEBManagedLBSecurityGroup-dw7edzemvt.
2020-09-29 07:43:13    INFO    Created target group named: arn:aws:elasticloadbalancing:eu-west-2:799479065523:targetgroup/awseb-domain--default-38qig/440561c9ab287e68
2020-09-29 07:43:13    INFO    Created security group named: sg-0e16398cbceab94d6
2020-09-29 07:43:14    INFO    Created Auto Scaling launch configuration named: awseb-e-tcwd2awzvs-stack-AWSEBAutoScalingLaunchConfiguration-1I6T492EE9NN1
2020-09-29 07:43:30    INFO    Created Load Balancer listener rule named: arn:aws:elasticloadbalancing:eu-west-2:799479065523:listener-rule/app/domain-production-plus/206b8390c82843a3/57e3715de5b24a02/0f045a9230df4191
2020-09-29 07:43:30    INFO    Created Load Balancer listener rule named: arn:aws:elasticloadbalancing:eu-west-2:799479065523:listener-rule/app/domain-production-plus/206b8390c82843a3/57e3715de5b24a02/f42374f1622dbd49
2020-09-29 07:43:30    INFO    Created Load Balancer listener rule named: arn:aws:elasticloadbalancing:eu-west-2:799479065523:listener-rule/app/domain-production-plus/206b8390c82843a3/457d5212b3cacc19/aa1f1cd2117f1290
2020-09-29 07:44:17    INFO    Created Auto Scaling group named: awseb-e-tcwd2awzvs-stack-AWSEBAutoScalingGroup-1I5GB63XJKP1Y
2020-09-29 07:44:17    INFO    Waiting for EC2 instances to launch. This may take a few minutes.
2020-09-29 07:44:17    INFO    Created Auto Scaling group policy named: arn:aws:autoscaling:eu-west-2:799479065523:scalingPolicy:664aebe1-ba1f-4d20-aed5-b44204b3a702:autoScalingGroupName/awseb-e-tcwd2awzvs-stack-AWSEBAutoScalingGroup-1I5GB63XJKP1Y:policyName/awseb-e-tcwd2awzvs-stack-AWSEBAutoScalingScaleDownPolicy-ZTC3D3FZQPZT
2020-09-29 07:44:17    INFO    Created Auto Scaling group policy named: arn:aws:autoscaling:eu-west-2:799479065523:scalingPolicy:c2431b1c-1efa-4927-a7ad-cdba75fa47ae:autoScalingGroupName/awseb-e-tcwd2awzvs-stack-AWSEBAutoScalingGroup-1I5GB63XJKP1Y:policyName/awseb-e-tcwd2awzvs-stack-AWSEBAutoScalingScaleUpPolicy-2MVWR52GOSTF
2020-09-29 07:44:32    INFO    Created CloudWatch alarm named: awseb-e-tcwd2awzvs-stack-AWSEBCloudwatchAlarmHigh-1OBABSCE98Y89
2020-09-29 07:44:32    INFO    Created CloudWatch alarm named: awseb-e-tcwd2awzvs-stack-AWSEBCloudwatchAlarmLow-UOJ9YBPCAIOH
2020-09-29 07:45:36    INFO    Successfully launched environment: domain-api-production-plus

更新

因此，我无法在豆茎环境中找到TargetResponseTime。

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Answer 1

我正在使用一个共享负载均衡器，这会是问题吗？使用经典的负载均衡器，它可以很好地设置自尺度度量来使用延迟。

Latency度量是只为 CLB，而不是其他负载均衡器类型：

延迟: HTTP侦听器从负载均衡器向注册实例发送请求到实例开始发送响应头的时间(以秒为单位)。

对于ALB，最近的度量将会是

TargetResponseTime:在请求离开负载均衡器之后经过的时间(以秒为单位)，直到收到来自目标的响应为止。这相当于访问日志中的target_processing_time字段。

在您的配置文件中有ALB和CLB设置的混合。例如，aws:elb:loadbalancer用于CLB，而带SharedLoadBalancer的aws:elbv2:loadbalancer仅用于ALB。

您的自动标度:触发器正在使用Latency，正如上面所解释的，它只适用于CLB。对于ALB来说，应该是TargetResponseTime。

我无法验证在您的ASG中更改MeasureName是否会解决所有的问题，但这肯定是造成问题的一个部分。