3.2. 为自动扩展实例配置 heat 模板

流程

1. 以 stack 用户身份登录您的环境。

   $ source ~/overcloudrc

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2. 创建存放自动扩展组实例配置的目录：

   $ mkdir -p $HOME/templates/autoscaling/vnf/

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3. 创建实例配置模板，如 $HOME/templates/autoscaling/vnf/instance.yaml。

4. 在 instance.yaml 文件中添加以下配置：

   cat <<EOF > $HOME/templates/autoscaling/vnf/instance.yaml
   heat_template_version: wallaby
   description: Template to control scaling of VNF instance
   
   parameters:
     metadata:
       type: json
     image:
       type: string
       description: image used to create instance
       default: fedora36
     flavor:
       type: string
       description: instance flavor to be used
       default: m1.small
     key_name:
       type: string
       description: keypair to be used
       default: default
     network:
       type: string
       description: project network to attach instance to
       default: private
     external_network:
       type: string
       description: network used for floating IPs
       default: public
   
   resources:
     vnf:
       type: OS::Nova::Server
       properties:
         flavor: {get_param: flavor}
         key_name: {get_param: key_name}
         image: { get_param: image }
         metadata: { get_param: metadata }
         networks:
           - port: { get_resource: port }
   
     port:
       type: OS::Neutron::Port
       properties:
         network: {get_param: network}
         security_groups:
           - basic
   
     floating_ip:
       type: OS::Neutron::FloatingIP
       properties:
         floating_network: {get_param: external_network }
   
     floating_ip_assoc:
       type: OS::Neutron::FloatingIPAssociation
       properties:
         floatingip_id: { get_resource: floating_ip }
         port_id: { get_resource: port }
   EOF

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   • parameters 参数定义此新资源的自定义证书。
   • resources 参数的 vnf 子参数定义了在 OS::Heat::AutoScalingGroup 中引用的自定义子资源的名称，例如 OS::Nova::Server::VNF。

5. 创建要在 heat 模板中引用的资源：

   $ cat <<EOF > $HOME/templates/autoscaling/vnf/resources.yaml
   resource_registry:
     "OS::Nova::Server::VNF": $HOME/templates/autoscaling/vnf/instance.yaml
   EOF

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6. 为 heat 创建部署模板来控制实例扩展：

   $ cat <<EOF > $HOME/templates/autoscaling/vnf/template.yaml
   heat_template_version: wallaby
   description:  Example auto scale group, policy and alarm
   resources:
     scaleup_group:
       type: OS::Heat::AutoScalingGroup
       properties:
         max_size: 3
         min_size: 1
         #desired_capacity: 1
         resource:
           type: OS::Nova::Server::VNF
           properties:
             metadata: {"metering.server_group": {get_param: "OS::stack_id"}}
   
     scaleup_policy:
       type: OS::Heat::ScalingPolicy
       properties:
         adjustment_type: change_in_capacity
         auto_scaling_group_id: { get_resource: scaleup_group }
         cooldown: 60
         scaling_adjustment: 1
   
     scaledown_policy:
       type: OS::Heat::ScalingPolicy
       properties:
         adjustment_type: change_in_capacity
         auto_scaling_group_id: { get_resource: scaleup_group }
         cooldown: 60
         scaling_adjustment: -1
   
     cpu_alarm_high:
       type: OS::Aodh::GnocchiAggregationByResourcesAlarm
       properties:
         description: Scale up instance if CPU > 50%
         metric: cpu
         aggregation_method: rate:mean
         granularity: 60
         evaluation_periods: 3
         threshold: 60000000000.0
         resource_type: instance
         comparison_operator: gt
         alarm_actions:
           - str_replace:
               template: trust+url
               params:
                 url: {get_attr: [scaleup_policy, signal_url]}
         query:
           list_join:
             - ''
             - - {'=': {server_group: {get_param: "OS::stack_id"}}}
   
     cpu_alarm_low:
       type: OS::Aodh::GnocchiAggregationByResourcesAlarm
       properties:
         description: Scale down instance if CPU < 20%
         metric: cpu
         aggregation_method: rate:mean
         granularity: 60
         evaluation_periods: 3
         threshold: 24000000000.0
         resource_type: instance
         comparison_operator: lt
         alarm_actions:
           - str_replace:
               template: trust+url
               params:
                 url: {get_attr: [scaledown_policy, signal_url]}
         query:
           list_join:
             - ''
             - - {'=': {server_group: {get_param: "OS::stack_id"}}}
   
   outputs:
     scaleup_policy_signal_url:
       value: {get_attr: [scaleup_policy, alarm_url]}
   
     scaledown_policy_signal_url:
       value: {get_attr: [scaledown_policy, alarm_url]}
   EOF

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   注意

   堆栈上的输出是信息性，在 ScalingPolicy 或 AutoScalingGroup 中不会被引用。要查看输出，请使用 openstack stack show <stack_name> 命令。