在不同文件中跨角色使用 Ansible 变量

Question

我正在尝试执行下面列出的活动

1. 从 Application Load Balancer 取消注册实例
2. 部署应用程序
3. 在 Application Load Balancer 上重新注册相同的实例

用例是将取消注册的实例重新添加回从其中删除它的相同 ALB 目标组。在取消注册实例时，我将目标组 ARN 保存在 {{ my_target_arn }} 中，然后以不同的角色使用它在目标组中注册回相同的实例。

下面是从 ALB 注销 Instance 的代码：

---
- name: Get EC2 instance ID
  ec2_instance_info:
    filters:
      private-ip-address: "{{ ansible_host }}"
  register: ec2_details

- name: Get list of target groups with the EC2
  delegate_to: localhost
  elb_target_info:
    instance_id: "{{ ec2_details.instances[0].instance_id }}"
  register: target_info

- name: Deregister the EC2
  delegate_to: localhost
  elb_target:
    target_group_arn: "{{ item.target_group_arn }}"
    target_id: "{{ ec2_details.instances[0].instance_id }}"
    deregister_unused: yes
    target_status_timeout: 10
    state: absent
  with_items: "{{ target_info.instance_target_groups }}"
  register: detached_details
  when: target_info != ""

- set_fact:
    my_target_arn: "{{ item.target_group_arn }}"
  with_items: "{{ target_info.instance_target_groups }}"
  when: target_info != ""

下面是添加实例的代码：

---
- name: Get EC2 instance ID
  ec2_instance_info:
    filters:
      private-ip-address: "{{ ansible_host }}"
  register: ec2_details

- name: Register the EC2
  delegate_to: localhost
  elb_target:
    target_group_arn: "{{ item }}"
    target_id: "{{ ec2_details.instances[0].instance_id }}"
    deregister_unused: yes
    target_status_timeout: 10
    state: present
  with_items: "{{ my_target_arn }}"
  register: attached_details
  when: my_target_arn != ""

剧本代码：

---
- name: Check EC2 details
  hosts: appserver

  roles:
    - roles/ec2_deregister
    - roles/deploy_application
    - roles/ec2_register

这里的问题是，我的{{ ansible_host }} 与多个目标组相关联。因此，在注销实例时，它会从这些多个目标组中注销实例。但是，在重新注册实例时，它只会将其添加回单个目标组（它获得的第一个目标组）。

所以基本上我想set_fact 使用一个可能有也可能没有多个值的列表变量（它可以是单个值或值列表）。请建议如何使用列表变量set_fact。

Answer 1

你用的是什么版本的ansible？

我尝试在一个角色中设置一个事实并将其传递给另一个角色，似乎效果很好。

我正在使用 ansible 2.9.6

角色1：

- set_fact:
    my_fact: test

角色2：

- debug:
    var: my_fact

剧本：

---
- hosts: localhost
  gather_facts: no
  become: no
  roles:
    - ./roles/role1
    - ./roles/role2

和输出：

TASK [./roles/role1 : set_fact] 
ok: [localhost]

TASK [./roles/role2 : debug] 
ok: [localhost] => {
    "my_fact": "test1234"
}

Answer 2

能够使用下面提到的代码获取列表

注销实例

---
- name: Get EC2 instance ID
  ec2_instance_info:
    filters:
      private-ip-address: "{{ ansible_host }}"
  register: ec2_details

- name: Get list of target groups with the EC2
  delegate_to: localhost
  elb_target_info:
    instance_id: "{{ ec2_details.instances[0].instance_id }}"
  register: target_info

- set_fact:
    my_target_arn: "{{ my_target_arn|default([]) + [{'target_group_arn': item}] }}"
  loop: "{{ target_info.instance_target_groups|map(attribute='target_group_arn')|list }}"
  when: target_info != ""

- name: Deregister the EC2
  delegate_to: localhost
  elb_target:
    target_group_arn: "{{ item.target_group_arn }}"
    target_id: "{{ ec2_details.instances[0].instance_id }}"
    deregister_unused: yes
    target_status_timeout: 10
    state: absent
  with_items: "{{ target_info.instance_target_groups }}"
  register: detached_details
  when: target_info != ""

注册回同一个实例

---
- name: Get EC2 instance ID
  ec2_instance_info:
    filters:
      private-ip-address: "{{ ansible_host }}"
  register: ec2_details
  when: my_target_arn is defined

- name: Register the EC2
  delegate_to: localhost
  elb_target:
    target_group_arn: "{{ item.target_group_arn }}"
    target_id: "{{ ec2_details.instances[0].instance_id }}"
    deregister_unused: yes
    target_status_timeout: 10
    state: present
  with_items: "{{ my_target_arn }}"
  register: attached_details
  when: my_target_arn is defined