在 ansible 中构建 group_vars 时循环遍历列表

Question

我是 ansible 的新手，我想部署 prometheus-grok-exporter（通过 ansible-grok-exporter 角色），并为我的运行 cacti 应用程序的所有节点配置特定配置。

我的库存是这样的：

cacti_first ansible_host=192.168.50.50
cacti_second ansible_host=192.168.50.51

[group__cacti]
cacti_first
cacti_second

里面 group_vars/group__cacti 我想添加这样的东西：

---
prometheus_grok_services_template:
  - name: cacti_metrics
    config_version: 3
    input:
        type: file
        paths: 
        {% for cacti_dir in cacti_path %}
        - "{{cacti_dir}}/log/cacti.log"
        {% endfor %}
        readall: false
        extaConfigContinuesFromHere: true

我有这样的主机配置： host_vars/cacti_first:

---
cacti_path:
 - /usr/share/cacti
prometheus_grok_services:
  - prometheus_grok_services_template

host_vars/cacti_second:

---
cacti_path:
 - /usr/share/cacti
 - /usr/share/cacti2
prometheus_grok_services:
  - prometheus_grok_services_template

在剧本中，我为 prometheus_grok_services 循环并使用 yaml 数据来提供服务。

现在 - 只要我不尝试在 group_vars/group__cacti 中使用循环，它就可以工作。 ansible-inventory 报告说：

$ ansible-inventory -i hosts --list cacti_second
ERROR! Syntax Error while loading YAML.
  found character that cannot start any token

The error appears to be in '/home/bastion/ansible-playbooks/group_vars/group__cacti': line 8, column 10, but may
be elsewhere in the file depending on the exact syntax problem.

The offending line appears to be:

        paths:
        {% for cacti_dir in cacti_path %}
         ^ here

所以，我想问一下 - 是否允许使用 jinja 循环来为组变量构建 yaml？这是我的语法错误吗？我应该如何模板化它？

我想避免将块移动到主机变量（我知道这是可行的），主要是因为它是一大段代码（大约 2KB 的 yaml 配置）并且它不像使用组变量那样优雅。

谢谢！

Answer 1

您不能在变量文件或剧本中使用这种 for 循环 - 它只适用于模板文件。要实现您的目标，您可以使用产品过滤器，如 https://docs.ansible.com/ansible/latest/user_guide/playbooks_filters.html#products

所述

在您的示例中，您将拥有：

---
prometheus_grok_services_template:
  - name: cacti_metrics
    config_version: 3
    input:
        type: file
        paths: "{{ cacti_path | product(['/log/cacti.log']) | map('join') | list }}"
        readall: false
        extaConfigContinuesFromHere: true

Answer 2

修复 group_vars。例如

shell> cat group_vars/group__cacti
---
prometheus_grok_services_template:
  - name: cacti_metrics
    config_version: 3
    input:
        type: file
        paths: "{{ paths_str|from_yaml }}"
        readall: false
        extaConfigContinuesFromHere: true
paths_str: |
  {% for cacti_dir in cacti_path %}
  - {{ cacti_dir }}/log/cacti.log
  {% endfor %}

然后，剧本

- hosts: group__cacti
  gather_facts: false
  tasks:
    - debug:
        msg: "{{ lookup('vars', item) }}"
      loop: "{{ prometheus_grok_services }}"

给予

ok: [cacti_first] => (item=prometheus_grok_services_template) =>
  msg:
  - config_version: 3
    input:
      extaConfigContinuesFromHere: true
      paths:
      - /usr/share/cacti/log/cacti.log
      readall: false
      type: file
    name: cacti_metrics
ok: [cacti_second] => (item=prometheus_grok_services_template) => 
  msg:
  - config_version: 3
    input:
      extaConfigContinuesFromHere: true
      paths:
      - /usr/share/cacti/log/cacti.log
      - /usr/share/cacti2/log/cacti.log
      readall: false
      type: file
    name: cacti_metrics

在 ansible 中构建 group_vars 时循环遍历列表

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