OpenStack Heat AutoScale Juno

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OpenStack Heat AutoScaling (Juno)

Это короткая заметка про использование автоскейлинша с хитом и цейлометром в Juno (сборка Mirantis и в ванильном джуно может не хватать каких-то бекпортов, я это специально не проверял)

Введение

Дальше по тексту я буду приводить только части шаблонов, полные шаблоны - в конце, отдельным разделом. Это нужно для простоты - читать "простыню" не удобно.
Основная задача формулируется так:

  • Есть абстрактное приложение которое надо масштабировать от нагрузки
  • При превышении порога по какой-либо метрике добавлять +N экземпляров приложения (виртуальную машину)
  • При отсутствии нагрузки удалять -M экземпляров приложения (виртуальных машин)
  • M и N - целые числа (в моем примере они будут равны 1)

Создание стека

Команду создания стека я вынес в отдельный скрипт для простоты 

D=` date  +%Y%m%d%H%M%S`

heat stack-create ABC-${D} -f asglb.yaml  \
-P "key_name=demo;net=net04;subnet=net04__subnet;public_net=net04_ext;app_lb_port=80;timeout=600;min_asg_size=1;max_asg_size=3;launch_asg_size=3"

2

3

4

asglb.yaml

heat_template_version: 2014-10-16

description: |
  Template which tests Neutron load balancing requests to members of
  Heat AutoScalingGroup.
  Instances must be running some webserver on a given app_port
  producing HTTP response that is different between servers
  but stable over time for given server.
  Auto-scaling is driven by Ceilometer alarms.
  Both HTTP and SSH access are load-balanced.

parameters:
  flavor:
    type: string
    default: m1.compact
  image:
    type: string
    default: Centos 6.5 x64 (pre installed node.js stack)
  username:
    type: string
    default: root
  key_name:
    type: string
    default: ericsson
  net:
    type: string
    default: net04
  subnet:
    type: string
    default: net04__subnet
  public_net:
    type: string
    default: net04_ext
  app_port:
    type: number
    default: 1026
  app_lb_port:
    type: number
    default: 80
  timeout:
    type: number
    default: 600
  min_asg_size:
    type: number
    default: 1
  max_asg_size:
    type: number
    default: 3
  launch_asg_size:
    type: number
    default: 2
  cooldown:
    type: number
    default: 60

resources:

  app_sec_group:
    type: OS::Neutron::SecurityGroup
    properties:
      rules:
      - remote_ip_prefix: 0.0.0.0/0
        protocol: tcp
        port_range_min: { get_param: app_port }
        port_range_max: { get_param: app_port }

  ssh_sec_group:
    type: OS::Neutron::SecurityGroup
    properties:
      rules:
      - remote_ip_prefix: 0.0.0.0/0
        protocol: tcp
        port_range_min: 22
        port_range_max: 22

  asg:
    type: OS::Heat::AutoScalingGroup
    properties:
      desired_capacity: { get_param: launch_asg_size }
      max_size: { get_param: max_asg_size }
      min_size: { get_param: min_asg_size }
      cooldown: { get_param: cooldown }
      resource:
#        type: https://raw.githubusercontent.com/olguncengiz/hot/master/app_server_neutron.yaml
        type: app_server_neutron.yaml
        properties:
          mdata: {"metering.stack": {get_param: "OS::stack_id"}}
          image: { get_param: image }
          flavor: { get_param: flavor }
          key_name: { get_param: key_name }
          net: { get_param: net}
          app_sec_group: { get_resource: app_sec_group }
          ssh_sec_group: { get_resource: ssh_sec_group }
          app_port: { get_param: app_port }
          app_pool_id: { get_resource: app_pool }
          ssh_pool_id: { get_resource: ssh_pool }
          timeout: { get_param: timeout }

  scale_up:
    type: OS::Heat::ScalingPolicy
    properties:
      adjustment_type: change_in_capacity
      auto_scaling_group_id: { get_resource: asg }
      scaling_adjustment: 1

  scale_down:
    type: OS::Heat::ScalingPolicy
    properties:
      adjustment_type: change_in_capacity
      auto_scaling_group_id: { get_resource: asg }
      scaling_adjustment: -1

  cpu_alarm_high:
    type: OS::Ceilometer::Alarm
    properties:
      description: Scale-up if the average CPU > 50% for 1 minute
      meter_name: cpu_util
      statistic: avg
      period: 60
      evaluation_periods: 1
      threshold: 50
      alarm_actions:
        - {get_attr: [scale_up, alarm_url]}
      matching_metadata: {"metadata.user_metadata.stack": {get_param: "OS::stack_id"}}
      comparison_operator: gt
      repeat_actions: true

  cpu_alarm_low:
    type: OS::Ceilometer::Alarm
    properties:
      description: Scale-down if the average CPU < 15% for 1 minute
      meter_name: cpu_util
      statistic: avg
      period: 60
      evaluation_periods: 1
      threshold: 15
      alarm_actions:
        - {get_attr: [scale_down, alarm_url]}
      matching_metadata: {"metadata.user_metadata.stack": {get_param: "OS::stack_id"}}
      comparison_operator: lt
      repeat_actions: true

  app_health_monitor:
    type: OS::Neutron::HealthMonitor
    properties:
      delay: 3
      type: HTTP
      timeout: 3
      max_retries: 3

  app_pool:
    type: OS::Neutron::Pool
    properties:
      lb_method: ROUND_ROBIN
      protocol: HTTP
      subnet: { get_param: subnet }
      monitors:
      - { get_resource: app_health_monitor }
      vip:
        protocol_port: { get_param: app_lb_port }

  app_floating_ip:
     type: OS::Neutron::FloatingIP
     properties:
       floating_network: { get_param: public_net }
       port_id:
         { get_attr: [app_pool, vip, 'port_id'] }

  ssh_pool:
    type: OS::Neutron::Pool
    properties:
      lb_method: ROUND_ROBIN
      protocol: TCP
      subnet: { get_param: subnet }
      vip:
        protocol_port: 22

  ssh_floating_ip:
     type: OS::Neutron::FloatingIP
     properties:
       floating_network: { get_param: public_net }
       port_id:
         { get_attr: [ssh_pool, vip, 'port_id'] }

outputs:

  app_lb_url:
    description: URL of the loadbalanced app
    value:
      str_replace:
        template: http://IP_ADDRESS:PORT
        params:
          IP_ADDRESS: { get_attr: [ app_floating_ip, floating_ip_address ] }
          PORT: { get_param: app_lb_port }

  ssh_lb_url:
    description: command for the loadbalanced SSH access
    value:
      str_replace:
        template: ssh -i KEY.pem USER@IP_ADDRESS
        params:
          IP_ADDRESS: { get_attr: [ ssh_floating_ip, floating_ip_address ] }
          KEY: { get_param: key_name }
          USER: { get_param: username }

  scale_up_hook:
    description: POST to this URL for manual scale up
    value: {get_attr: [scale_up, alarm_url]}

  scale_down_hook:
    description: POST to this URL for manual scale up
    value: {get_attr: [scale_down, alarm_url]}

APP_server_neutron.yaml

HeatTemplateFormatVersion: 2012-12-12

Description: |
  App server that is a member of Neutron Pool.

Parameters:
  mdata:
    Type: Json
  image:
    Type: String
  flavor:
    Type: String
  key_name:
    Type: String
  net:
    Type: String
  app_sec_group:
    Type: String
  ssh_sec_group:
    Type: String
  app_pool_id:
    Type: String
  ssh_pool_id:
    Type: String
  app_port:
    Type: Number
    Default: 1026
  timeout:
    Type: Number
#  mem_alarm_low:
#    Type: String
#  mem_alarm_high:
#    Type: String
  secret_key:
    Type: String
  access_key:
    Type: String
  stack_id:
    Type: String

Resources:

  server:
    Type: OS::Nova::Server
    Properties:
      metadata: { Ref: mdata }
      image: { Ref: image }
      flavor: { Ref: flavor }
      key_name: { Ref: key_name }
      networks:
        - network: { Ref: net }
      security_groups:
        - { Ref: app_sec_group }
        - { Ref: ssh_sec_group }
      user_data:
        "Fn::Base64": {
        "Fn::Join" : ["",
        [
        "#!/bin/bash -v\n",
        "\n",
        "#yum -y install heat-cfntools-1.2.6-4.el6.noarch\n",
        "#/usr/bin/cfn-create-aws-symlinks\n",
        "\n",
        "mkdir  -p   \"/etc/cfn/\"\n ",
        "touch /etc/cfn/cfn-credentials\n",
        "echo   \"AWSAccessKeyId=\"",  { "Ref" : "access_key" } , ">>/etc/cfn/cfn-credentials\n",
        "echo   \"AWSSecretKey=\"", {"Ref" : "secret_key" }, ">> /etc/cfn/cfn-credentials\n" ,
        "\n",
        "service crond restart \n",
        "yum -y install cpulimit stress screen \n",
        "cd /tmp ; git clone https://github.com/julman99/eatmemory.git; cd eatmemory; make;  make install \n",
        "pip install python-ceilometerclient \n",
        "echo \"export LC_ALL=C\" >> /root/openrc \n",
        "echo \"export OS_NO_CACHE='true'\" >> /root/openrc \n",
        "echo \"export OS_TENANT_NAME='admin'\" >> /root/openrc \n",
        "echo \"export OS_USERNAME='admin'\" >> /root/openrc \n",
        "echo \"export OS_PASSWORD='admin'\" >> /root/openrc \n",
        "echo \"export OS_AUTH_URL='http://159.8.10.162:5000/v2.0/'\" >> /root/openrc \n",
        "echo \"export OS_AUTH_STRATEGY='keystone'\" >> /root/openrc \n",
        "echo \"export OS_REGION_NAME='RegionOne'\" >> /root/openrc \n",
        "echo \"export CINDER_ENDPOINT_TYPE='publicURL'\" >> /root/openrc \n",
        "echo \"export GLANCE_ENDPOINT_TYPE='publicURL'\" >> /root/openrc \n",
        "echo \"export KEYSTONE_ENDPOINT_TYPE='publicURL'\" >> /root/openrc \n",
        "echo \"export NOVA_ENDPOINT_TYPE='publicURL'\" >> /root/openrc \n",
        "echo \"export NEUTRON_ENDPOINT_TYPE='publicURL'\" >> /root/openrc \n",
        "ceilometer sample-create -r 6c3fd865-a478-4afc-909e-eced382de432  -m test_meter --meter-type gauge  --meter-unit percents --sample-volume 99 --resource-metadata '{\"metering.metadata.user_metadata.stack\": \"", { "Ref": "stack_id" }, "\"}'\n",
        { "Fn::GetAtt": ["handle", "curl_cli" ] }, " --data-binary '{\"status\": \"SUCCESS\"}'\n"
         ] ]
        }


  handle:
    Type: OS::Heat::WaitConditionHandle

  waiter:
    Type: OS::Heat::WaitCondition
    DependsOn: server
    Properties:
      timeout: { Ref: timeout }
      handle: { Ref: handle }

  app_pool_member:
    Type: OS::Neutron::PoolMember
    DependsOn: waiter
    Properties:
      address: { "Fn::GetAtt": [ server, first_address ] }
      pool_id: { Ref: app_pool_id }
      protocol_port: { Ref: app_port }

  ssh_pool_member:
    Type: OS::Neutron::PoolMember
    DependsOn: waiter
    Properties:
      address: { "Fn::GetAtt": [ server, first_address ] }
      pool_id: { Ref: ssh_pool_id }
      protocol_port: 22

Outputs:
  WaitNotify:
    Value: { "Fn::GetAtt": ["handle", "curl_cli" ]  }
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