cloudify - 如何在 Cloudify 中正确地自动扩展虚拟机组？

Question

我正在使用 cloudify 社区版本 19.01.24。

试图弄清楚如何自动扩展一组两个虚拟机。到目前为止，这是我想出的（跳过不相关的部分）：

  monitored_vm1_port:
    type: cloudify.openstack.nodes.Port
    properties:
      openstack_config: *openstack_config
    relationships:
      - type: cloudify.relationships.contained_in
        target: proxy_server_network

  monitored_vm2_port:
    type: cloudify.openstack.nodes.Port
    properties:
      openstack_config: *openstack_config
    relationships:
      - type: cloudify.relationships.contained_in
        target: proxy_server_network

  monitored_vm1_host:
    type: cloudify.openstack.nodes.Server
    properties:
      image: { get_input: image }
      flavor: { get_input: flavor }
      resource_id: { concat: ['monitored_vm1-', { get_input: client_name }] }
      agent_config:
        user: { get_input: agent_user }
        key: { get_property: [ keypair, private_key_path ] }
    interfaces:
      cloudify.interfaces.monitoring_agent:
        install:
          implementation: diamond.diamond_agent.tasks.install
          inputs:
            diamond_config:
              interval: 10
        start: diamond.diamond_agent.tasks.start
        stop: diamond.diamond_agent.tasks.stop
        uninstall: diamond.diamond_agent.tasks.uninstall
      cloudify.interfaces.monitoring:
        start:
          implementation: diamond.diamond_agent.tasks.add_collectors
          inputs:
            collectors_config:
              NetworkCollector: {}
    relationships:
     - type: cloudify.openstack.server_connected_to_port
       target: monitored_vm1_port
     - type: cloudify.openstack.server_connected_to_keypair
       target: keypair

  monitored_vm2_host:
    type: cloudify.openstack.nodes.Server
    properties:
      image: { get_input: image }
      flavor: { get_input: flavor }
      resource_id: { concat: ['monitored_vm2-', { get_input: client_name }] }
      agent_config:
        user: { get_input: agent_user }
        key: { get_property: [ keypair, private_key_path ] }
    interfaces:
      cloudify.interfaces.monitoring_agent:
        install:
          implementation: diamond.diamond_agent.tasks.install
          inputs:
            diamond_config:
              interval: 10
        start: diamond.diamond_agent.tasks.start
        stop: diamond.diamond_agent.tasks.stop
        uninstall: diamond.diamond_agent.tasks.uninstall
      cloudify.interfaces.monitoring:
        start:
          implementation: diamond.diamond_agent.tasks.add_collectors
          inputs:
            collectors_config:
              NetworkCollector: {}
    relationships:
     - type: cloudify.openstack.server_connected_to_port
       target: monitored_vm2_port
     - type: cloudify.openstack.server_connected_to_keypair
       target: keypair

groups:
  vm_group:
    members: [monitored_vm1_host, monitored_vm2_host]

  scale_up_group:
    members: [monitored_vm1_host, monitored_vm2_host]
    policies:
      auto_scale_up:
        type: scale_policy_type
        properties:
          policy_operates_on_group: true
          scale_limit: 2 # max additional instances
          scale_direction: '<'
          scale_threshold: 31457280
          service_selector: .*monitored_vm1_host.*network.eth0.rx.bit
          cooldown_time: 60
        triggers:
          execute_scale_workflow:
            type: cloudify.policies.triggers.execute_workflow
            parameters:
              workflow: scale
              workflow_parameters:
                delta: 1
                scalable_entity_name: vm_group
                scale_compute: true

policies:
  vm_group_scale_policy:
    type: cloudify.policies.scaling
    properties:
      default_instances: 1
    targets: [vm_group]

因此蓝图已正确部署，并且正在根据指定条件（VM 界面上的流量）触发扩展工作流，但在创建新 VM 实例期间失败，并出现以下错误：

2019-11-18 14:54:46,591:ERROR: Task nova_plugin.server.create[f736f81c-7f8c-4f82-a280-8352c1d01bff] raised:
Traceback (most recent call last):
  (...)
NonRecoverableError: Port 3b727b5e-a2ec-47cc-b711-37cb80a7b4e5 is still in use. [status_code=409]

看起来 Cloudify 正在尝试使用现有端口生成新实例，这很奇怪。所以我想，也许我应该明确地将 VM 的端口也放在伸缩组中，以便将它们与 VM 一起复制。像这样尝试过：

  vm_group:
    members: [monitored_vm1_host, monitored_vm1_port, monitored_vm2_host, monitored_vm2_port]

但在这种情况下，我已经在蓝图验证阶段收到关于一些缺失对象关系的错误：

Invalid blueprint - Node 'monitored_vm1_host' and 'monitored_vm1_port' belong to some shared group but they are not contained in any shared node, nor is any ancestor node of theirs.
  in: /opt/manager/resources/blueprint-with-scaling-d79fed3d-0b3b-4459-a851-fedd9ecf50c6/blueprint-with-scaling.yaml

我浏览了文档和我能找到的任何示例（没有很多），但我不清楚。

我怎样才能让它正确缩放？

标签： cloudify

Answer 1

正如您所说，您遇到了第一个错误，因为 Cloudify 尝试扩展 VM 并将其连接到已经绑定到第一个 VM 的端口。

第二个错误表示如果端口不依赖于也被缩放的节点，则无法缩放端口，这是为了避免无法缩放的资源规模。

对此的解决方案是，拥有一个 cloudify.nodes.Root 类型的节点并通过端口关系连接到它，如果端口依赖于该节点并且该节点将成为缩放组的一部分，您将能够进行缩放.

你的蓝图会是这样的：

 my_relationship_node:
    type:  cloudify.nodes.Root

 port:
    type: cloudify.openstack.nodes.Port
    properties:
      openstack_config: *openstack_config
    relationships:
    - type: cloudify.relationships.connected_to
      target: public_network
    - type: cloudify.relationships.depends_on
      target: public_subnet
    - type: cloudify.openstack.port_connected_to_security_group
      target: security_group
    - type: cloudify.openstack.port_connected_to_floating_ip  
      target: ip
    - type: cloudify.relationships.contained_in
      target: my_relationship_node

我希望它有所帮助。