{Alibaba CLB} Use Auto Scaling to scale a CLB server group

 

https://www.alibabacloud.com/help/en/slb/classic-load-balancer/use-cases/associate-or-disassociate-slb-instances-with-or-from-a-scaling-group

https://qiita.com/wa-ta-ru/items/7a9f56eb0fd84d1962e4

-- 1. ECSインスタンス作成

 

cat <<-'EOF' > variables.tf

locals {
  availability_zone = "ap-northeast-1b"
}

variable "instance_type" {
  description = "instance_type"
  type = string
  default = "ecs.t5-lc2m1.nano"
}

variable "image_id" {
  description = "image_id"
  type = string
  default = "aliyun_2_1903_x64_20G_alibase_20231221.vhd"
}

EOF

 

cat <<-'EOF' > main.tf

terraform {
  required_version = ">= 1.0.0, < 2.0.0"
  required_providers {
    alicloud = {
       source  = "aliyun/alicloud"
       version = "= 1.217.0"
    }
  }
}

provider "alicloud" {
    region  = "ap-northeast-1"
}

resource "alicloud_vpc" "vpc01" {
  vpc_name          = "vpc01"
  description       = "vpc01"
  cidr_block        = "10.2.0.0/16"
}

 

resource "alicloud_vswitch" "sw01" {
  vswitch_name      = "sw01"
  description       = "sw01"
  vpc_id            = alicloud_vpc.vpc01.id
  cidr_block        = "10.2.1.0/24"
  zone_id           = local.availability_zone
}

 resource "alicloud_security_group" "sg01" {
   name                = "sg01"
   description         = "sg01"
   vpc_id              = alicloud_vpc.vpc01.id
   security_group_type = "normal"
 }

resource "alicloud_security_group_rule" "sg0101" {
  type              = "ingress"
  ip_protocol       = "tcp"
  port_range        = "80/80"
  security_group_id = alicloud_security_group.sg01.id
  nic_type          = "intranet"
  policy            = "accept"
  priority          = 10
  cidr_ip           = "0.0.0.0/0"
  description       = "sg0101"
}

resource "alicloud_security_group_rule" "sg0102" {
  type              = "ingress"
  ip_protocol       = "tcp"
  port_range        = "22/22"
  security_group_id = alicloud_security_group.sg01.id
  nic_type          = "intranet"
  policy            = "accept"
  priority          = 10
  cidr_ip           = "0.0.0.0/0"
  description       = "sg0102"
}

resource "alicloud_vpc_ipv4_gateway" "gw01" {
  ipv4_gateway_name        = "gw01"
  ipv4_gateway_description = "gw01"
  vpc_id                   = alicloud_vpc.vpc01.id
  enabled                  = true
}

# ルートテーブルへvSwitchの関連付け
resource "alicloud_route_table_attachment" "sw01_rt01" {
  vswitch_id     = alicloud_vswitch.sw01.id
  route_table_id = alicloud_vpc.vpc01.route_table_id
}

# ルートテーブルへカスタムルート追加
resource "alicloud_route_entry" "rt0101" {
  name                  = "rt0101"
  route_table_id        = alicloud_vpc.vpc01.route_table_id
  destination_cidrblock = "0.0.0.0/0"
  nexthop_type          = "Ipv4Gateway"
  nexthop_id            = alicloud_vpc_ipv4_gateway.gw01.id
}

 

resource "alicloud_instance" "ecs01" {
  image_id                   = var.image_id
  instance_type              = var.instance_type
  security_groups            = [alicloud_security_group.sg01.id]
  instance_name              = "ecs01"
  system_disk_category       = "cloud_ssd"
  system_disk_name           = "ecs01"
  system_disk_size           = 20
  description                = "ecs01"
  internet_charge_type       = "PayByBandwidth"
  internet_max_bandwidth_out = 0
  host_name                  = "ecs01"
  vswitch_id                 = alicloud_vswitch.sw01.id
  instance_charge_type       = "PostPaid"
  key_name                   = "alibabakey01"
  deletion_protection        = false
  credit_specification       = "Standard"

}

resource "alicloud_eip_address" "eip01" {
  address_name              = "eip01"
  bandwidth                 = 1
  deletion_protection       = false
  description               = "eip01"
  internet_charge_type      = "PayByTraffic"
  isp                       = "BGP"
  payment_type              = "PayAsYouGo"
  netmode                   = "public"
}

# インスタンスとEIPの関連付け
resource "alicloud_eip_association" "ecs01_eip01" {
  instance_id              = alicloud_instance.ecs01.id
  allocation_id            = alicloud_eip_address.eip01.id
}

 

EOF

 

cat <<-'EOF' > outputs.tf

 

output "vpc01_id" {
  value = alicloud_vpc.vpc01.id
  description = "vpc01.id"
}

output "sw01_id" {
  value = alicloud_vswitch.sw01.id
  description = "sw01.id"
}

output "sg01_id" {
  value = alicloud_security_group.sg01.id
  description = "sg01.id"
}

 

output "ecs01_id" {
  value = alicloud_instance.ecs01.id
  description = "ecs01.id"
}

EOF

 

terraform init
terraform fmt
terraform -version

 

terraform plan

terraform apply -auto-approve

yum install -y httpd
systemctl start httpd
systemctl enable httpd
echo $(uname -n) > /var/www/html/index.html

 

 

-- 2. カスタムイメージ作成

 

イメージの一覧
aliyun ecs DescribeImages \
--ImageOwnerAlias self 

 

イメージの作成
aliyun ecs CreateImage \
--ImageName image01 \
--InstanceId i-11111111111111111111 

 

スナップショットの一覧
aliyun ecs DescribeSnapshots

 

 

-- 3. CLB作成

aliyun slb DescribeLoadBalancers 

 

aliyun slb CreateLoadBalancer \
--AddressType internet \
--Bandwidth 1 \
--DeleteProtection off \
--InstanceChargeType PayBySpec \
--InternetChargeType paybybandwidth \
--LoadBalancerName clb01 \
--LoadBalancerSpec slb.s1.small \
--MasterZoneId ap-northeast-1a \
--PayType PayOnDemand \
--SlaveZoneId ap-northeast-1b 

 

aliyun slb DescribeLoadBalancerAttribute \
--LoadBalancerId lb-111111111111111111111 

 

--4. 仮想サーバーグループ作成

aliyun slb DescribeVServerGroups \
--LoadBalancerId lb-111111111111111111111 

 

aliyun slb CreateVServerGroup \
--LoadBalancerId lb-111111111111111111111 \
--VServerGroupName be01 

 

 

仮想サーバーグループへのサーバー追加

aliyun slb DescribeVServerGroupAttribute \
--VServerGroupId rsp-1111111111111 

aliyun slb AddVServerGroupBackendServers \
--VServerGroupId rsp-1111111111111 \
--BackendServers ' [
  {
    "Port": 80,
    "ServerId": "i-11111111111111111111",
    "Type": "ecs",
    "Weight": 100
  }
]'

 

 

--5. リスナー作成

aliyun slb DescribeLoadBalancerListeners 

 

aliyun slb CreateLoadBalancerHTTPListener \
--HealthCheck on \
--ListenerPort 80 \
--LoadBalancerId lb-111111111111111111111 \
--StickySession off \
--Bandwidth 1 \
--Description lis01 \
--Gzip on \
--HealthCheckConnectPort 80 \
--HealthCheckHttpCode "http_2xx,http_3xx" \
--HealthCheckInterval 2 \
--HealthCheckMethod head \
--HealthCheckTimeout 5 \
--HealthCheckURI "/" \
--HealthyThreshold 3 \
--IdleTimeout 15 \
--ListenerForward off \
--RequestTimeout 60 \
--UnhealthyThreshold 3 \
--VServerGroupId rsp-1111111111111 

 

aliyun slb StartLoadBalancerListener \
--LoadBalancerId lb-111111111111111111111 \
--ListenerPort 80 

 

aliyun slb DescribeHealthStatus \
--LoadBalancerId lb-111111111111111111111 

 

-- 6. Create a scaling group

aliyun ess CreateScalingGroup \
--MaxSize 2 \
--MinSize 1 \
--CompensateWithOnDemand false \
--DefaultCooldown 300 \
--DesiredCapacity 1 \
--GroupDeletionProtection false \
--GroupType ECS \
--HealthCheckType ECS \
--MultiAZPolicy PRIORITY \
--ScalingGroupName asg02 \
--VSwitchId vsw-111111111111111111111 \
--LoadBalancerIds '["lb-111111111111111111111"]' 

 

 

aliyun ess DescribeScalingGroups 

 

 

-- 7. Create a scaling configuration

aliyun ess CreateScalingConfiguration \
--ScalingGroupId asg-11111111111111111111 \
--CreditSpecification Standard \
--DeletionProtection false \
--ImageId m-11111111111111111111  \
--ImageOptions.LoginAsNonRoot false \
--InstanceType ecs.t5-lc2m1.nano \
--InternetChargeType PayByBandwidth \
--InternetMaxBandwidthIn 1 \
--InternetMaxBandwidthOut 0 \
--KeyPairName alibabakey01 \
--ScalingConfigurationName asc01 \
--SecurityGroupId sg-11111111111111111111 \
--SystemDisk.Category cloud_ssd \
--SystemDisk.Size 20

 

 

aliyun ess DescribeScalingConfigurations 

aliyun ess EnableScalingGroup \
--ScalingGroupId asg-11111111111111111111 \
--ActiveScalingConfigurationId asc-11111111111111111111 

 

 

-- 8. Create scaling rules

aliyun ess CreateScalingRule \
--ScalingGroupId asg-11111111111111111111 \
--AdjustmentType QuantityChangeInCapacity \
--AdjustmentValue 1 \
--Cooldown 60 \
--ScalingRuleName asr01 \
--ScalingRuleType SimpleScalingRule 

aliyun ess CreateScalingRule \
--ScalingGroupId asg-11111111111111111111 \
--AdjustmentType QuantityChangeInCapacity \
--AdjustmentValue=-1 \
--Cooldown 60 \
--ScalingRuleName asr02 \
--ScalingRuleType SimpleScalingRule 

aliyun ess DescribeScalingRules 

 

 

-- 9. Create event-triggered tasks

aliyun ess CreateAlarm \
--ScalingGroupId asg-11111111111111111111 \
--AlarmAction.1 ari:acs:ess:ap-northeast-1:1111111111111111:scalingrule/asr-11111111111111111111 \
--ComparisonOperator ">=" \
--Description alarm01 \
--Dimension.1.DimensionKey scaling_group \
--Dimension.1.DimensionValue asg-11111111111111111111 \
--Dimension.2.DimensionKey userId \
--Dimension.2.DimensionValue 1111111111111111 \
--Effective "* * * * * ?" \
--EvaluationCount 3 \
--Expression.1.ComparisonOperator ">=" \
--Expression.1.MetricName CpuUtilization \
--Expression.1.Period 60 \
--Expression.1.Statistics Average \
--Expression.1.Threshold 80.0 \
--ExpressionsLogicOperator "&&" \
--MetricName CpuUtilization \
--MetricType system \
--Name alarm01 \
--Period 60 \
--Statistics Average \
--Threshold 80.0 

aliyun ess CreateAlarm \
--ScalingGroupId asg-11111111111111111111 \
--AlarmAction.1 ari:acs:ess:ap-northeast-1:1111111111111111:scalingrule/asr-11111111111111111111 \
--ComparisonOperator "<=" \
--Description alarm02 \
--Dimension.1.DimensionKey scaling_group \
--Dimension.1.DimensionValue asg-11111111111111111111 \
--Dimension.2.DimensionKey userId \
--Dimension.2.DimensionValue 1111111111111111 \
--Effective "* * * * * ?" \
--EvaluationCount 3 \
--Expression.1.ComparisonOperator "<=" \
--Expression.1.MetricName CpuUtilization \
--Expression.1.Period 60 \
--Expression.1.Statistics Average \
--Expression.1.Threshold 20.0 \
--ExpressionsLogicOperator "&&" \
--MetricName CpuUtilization \
--MetricType system \
--Name alarm02 \
--Period 60 \
--Statistics Average \
--Threshold 20.0 

 

 

aliyun ess DescribeAlarms 

 

-- 10. Add ECS instances to the scaling group

 

aliyun ess AttachInstances \
--ScalingGroupId asg-11111111111111111111 \
--InstanceId.1 i-11111111111111111111 
 

 

-- 11. 動確

yes > /dev/null

-- 12. クリーンアップ

 

aliyun ess DeleteAlarm \
--AlarmTaskId asg-11111111111111111111_11111111-1111-1111-1111-111111111111 

aliyun ess DeleteAlarm \
--AlarmTaskId asg-11111111111111111111_11111111-1111-1111-1111-111111111111 

aliyun ess DescribeAlarms 

 

aliyun ess DeleteScalingRule \
--ScalingRuleId asr-11111111111111111111

aliyun ess DeleteScalingRule \
--ScalingRuleId asr-11111111111111111111

aliyun ess DescribeScalingRules 

scaling groupのインスタンス最大数をゼロに更新

aliyun ess DisableScalingGroup \
--ScalingGroupId asg-11111111111111111111 

aliyun ess DeactivateScalingConfiguration \
--ScalingConfigurationId asc-11111111111111111111 

aliyun ess DeleteScalingConfiguration \
--ScalingConfigurationId asc-11111111111111111111 

aliyun ess DeleteScalingGroup \
--ScalingGroupId asg-11111111111111111111 

aliyun ess DescribeScalingGroups 

 

aliyun slb StopLoadBalancerListener \
--LoadBalancerId lb-111111111111111111111 \
--ListenerPort 80 

aliyun slb DeleteLoadBalancerListener \
--LoadBalancerId lb-111111111111111111111 \
--ListenerPort 80 

aliyun slb DescribeLoadBalancerListeners 

 

aliyun slb RemoveVServerGroupBackendServers \
--VServerGroupId rsp-1111111111111 \
--BackendServers ' [
  {
    "Port": 80,
    "ServerId": "i-11111111111111111111",
    "Type": "ecs",
    "Weight": 100
  }
]'

aliyun slb DescribeVServerGroupAttribute \
--VServerGroupId rsp-1111111111111 

aliyun slb DeleteVServerGroup \
--VServerGroupId rsp-1111111111111 

aliyun slb DescribeVServerGroups \
--LoadBalancerId lb-111111111111111111111 

 

aliyun slb DeleteLoadBalancer \
--LoadBalancerId lb-111111111111111111111 

aliyun slb DescribeLoadBalancers 

 

aliyun ecs DescribeImages \
--ImageOwnerAlias self 

aliyun ecs DeleteImage \
--ImageId m-11111111111111111111 \
--Force true 

aliyun ecs DescribeSnapshots

aliyun ecs DeleteSnapshot \
--SnapshotId s-11111111111111111111 

 

terraform destroy -auto-approve