在 Ansible 中，如何将来自活动角色的变量组合到一个数组中? [英] In Ansible, how to combine variables from active roles into one array?

问题描述

查看在 Ansible 中，如何将来自不同文件的变量合并到一个数组中?" 答案之一建议使用 include_vars 将多个来源的变量放入一个数组中，这几乎我需要但不完全是.

Looking at "In Ansible, how to combine variables from separate files into one array?" one of the answers suggests using include_vars to get variables from several sources into one array, this is almost what I need but not quite.

我正在设置 cloudfront_logging，它需要 awslogs_logs: 数组中的项目.我希望能够为我有活动的角色添加到这个数组中，所以 Syslog 是我的共同角色，但如果我有一个 php 角色​​，我希望它包含 php 日志.

I'm setting up cloudfront_logging which requires items in a awslogs_logs: array. I'd like to be able to add to this array for the roles that I have active, so Syslog in my common role but if I have a php role, I'd like it to include the php logs.

我想我可以让 include_vars 为所有角色工作，但我看不出如何让它只为包含在构建中的角色工作.因此，如果我包含 php 角色​​，则包含 php 日志，但如果不包含则不包含.

I think I could get include_vars to work for all roles, but I can't see how to get this to work for only the roles included in a build. So if I include the php role, include the php logs but not if it is not included.

当然，我可以静态地将数组包含在顶层，但这似乎在架构上有点偏离，因为您希望角色能够处理自己的日志记录.

I could, of course, include the array at the top level statically but that seems like it is architecturally a bit off as you'd expect a role to be able to deal with its' own logging.

推荐答案

您的角色可以使用 set_fact 任务将信息附加到变量.例如，假设您希望角色能够在 logfiles 事实中注册日志文件的路径；你可以在每个角色中做这样的事情:

Your roles can use a set_fact task to append information to a variable. For example, let's say you want roles to be able to register paths to log files in the logfiles fact; you could do something like this in each role:

- set_fact:
    logfiles: "{{ logfiles|default([]) + ['/var/log/something.log', '/var/log/anotherthing.log'] }}"

换句话说，如果 roles/role1/tasks 看起来像这样:

In other words, if roles/role1/tasks looks like this:

---
- set_fact:
    logfiles: "{{ logfiles|default([]) + ['/var/log/role1.log'] }}"

roles/role2/tasks 看起来像这样:

---
- set_fact:
    logfiles: "{{ logfiles|default([]) + ['/var/log/role2.log'] }}"

然后是一个看起来像这样的剧本:

Then a playbook that looks like this:

---
- hosts: localhost
  gather_facts: false
  roles:
    - role1
    - role2

  tasks:
    - debug:
        var: logfiles

将产生此输出:

PLAY [localhost] ******************************************************************************

TASK [role1 : set_fact] ***********************************************************************
ok: [localhost]

TASK [role2 : set_fact] ***********************************************************************
ok: [localhost]

TASK [debug] **********************************************************************************
ok: [localhost] => {
    "logfiles": [
        "/var/log/role1.log", 
        "/var/log/role2.log"
    ]
}

PLAY RECAP ************************************************************************************
localhost                  : ok=3    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   

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