如何将play中的主机动态设置为Ansible中的vars_file中的变量

Question

我有一个剧本，它定义了一组基于调查的变量，任务被运行，包括将变量写入文件。在第二部戏中，我想根据文件中的一个变量来设置主机。它为主机提供了一个未定义的变量。

--- 
- name: "Provision Routers"
  connection: network_cli
  gather_facts: false
  hosts: '{{ DataCenter }}'
   
  vars: 
    customer_name: "{{ CustomerName }}"
    data_center: "{{ DataCenter }}"
    evpn_id: "{{ EVPN_ID }}"
    layer_3: "{{ LAYER_3 }}"
    ip_address: "{{ BVI_IP }}"
    prefix_mask: "{{ MASK }}"
      
  tasks:
        
    - name: "Config Router EVPN"
      iosxr_config: 
        lines:
          - evi {{evpn_id}}
          - control-word-disable
          - advertise-mac
        parents: evpn
        
------------------I'm leaving a bunch of tasks out to--------------------------
------------------Make this easier to read-------------------------------------
      
    - name: Make vars persistent
      local_action: 
        module: copy 
        content:
          - customer_name: "{{ customer_name }}"
          - data_center: "{{ data_center }}"
          - evpn_id: "{{ evpn_id }}"
        dest: /etc/ansible/group_vars/evpn_vars.yml
        mode: 0666

# 2nd play---------------------------------------------------------------------

- name: "Provision Switches"
  hosts: '{{ switch_group }}'
  vars_files:
    - /etc/ansible/group_vars/evpn_vars.yml
    
  tasks:
  
    - name: Set switch_group to Commerce
      set_fact:
        switch_group: Commerce_Switches
      when: data_center == 'Commerce'
    
    - name: Set switch_group to Gumlog
      set_fact:
        switch_group: Gumlog_Switches
      when: data_center == 'Gumlog'
      
    - name: Set switch_group to Richland
      set_fact:
        switch_group: Richland_Switches
      when: data_center == 'Richland'

这是我得到的错误：

错误！字段“host”有一个无效的值，其中包含一个未定义的变量。错误是：“switch_group”未定义--错误出现在第3列的第106行，但可能在文件的其他地方，具体取决于语法问题。冒犯的界限似乎是：

• 名称：“提供开关”^

这就是我的变量文件的样子：

{customer_name："TEST444"}，{"data_center"："Richland"}，{"evpn_id"："444"}

为了概括我想要做的事情，我需要根据先前在原始调查中的输入，将主机设置成一个不同的组。

为了增加一些颜色，我的第一个播放是在一个数据中心提供一组路由器，第二个播放是交换机。我把它们分开了，因为很明显，您不想将相同的配置推送到路由器上。如果有更好的方法来隔离这两组人(他们有不同的操作系统)，我会全神贯注。

Answer 1

你的switch_group是假的。

[{"customer_name": "TEST444"}, {"data_center": "Richland"}, {"evpn_id": "444"}]

它应该是有效的JSON。看见

$ ansible-inventory -i "8.8.4.4," --list all
{
    "_meta": {
        "hostvars": {}
    },
    "all": {
        "children": [
            "ungrouped"
        ]
    },
    "ungrouped": {
        "hosts": [
            "8.8.4.4"
        ]
    }
}

因此，通过ansible-inventory --list switch_group进行测试。

Answer 2

因此，我能够通过将第二次播放设置为本地主机，然后使用delegate_to来更改主机来实现这一工作。但它并不像我想的那样优雅。

- name: Make vars persistent
      local_action: 
        module: copy 
        content:
          - customer_name: "{ customer_name }}"
          - data_center: "{{ data_center }}"
          - evpn_id: "{{ evpn_id }}"
        dest: /etc/ansible/group_vars/evpn_vars.yml
        mode: 0666

- name: "Provision Switches"
  hosts: localhost
  vars_files:
    - /etc/ansible/group_vars/evpn_vars.yml
    
  tasks:
  
    - name: Set switch_group to Commerce
      set_fact:
        switch_group: Commerce_Switches
      when: data_center == 'Commerce'
    
    - name: Set switch_group to Gumlog
      set_fact:
        switch_group: Gumlog_Switches
      when: data_center == 'Gumlog'
      
    - name: Set switch_group to Richland
      set_fact:
        switch_group: Richland_Switches
      when: data_center == 'Richland'
      
    - name: Set port to layer 2
      nxos_interface:
        name: Ethernet1/2
        description: 'Configured by Ansible'
        mode: layer2
        admin_state: up
      delegate_to: "{{ groups[switch_group][0] }}"
      
    - name: Test nxos
      nxos_l2_interface:
        name: Ethernet1/2
        mode: trunk
        trunk_vlans: 5-10
      delegate_to: "{{ groups[switch_group][0] }}"

如果我可以delegate_to一个组而不是一个主机，它会对我工作得更好。或者，如果有一个不同的策略，所有这些我都错过了。