在Ansible中，如何将活动角色中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，如何将变量从单独的文件合并到一个数组中?"，答案之一是建议使用

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.我希望能够为我所拥有的角色添加到此数组中，所以Syslog担任我的常见角色，但是如果我有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 适用于所有角色，但是我看不到如何使它仅适用于构建中包含的角色.因此，如果我包括php角色，请包括php日志，但如果不包括php日志，则不包括.

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.

我当然可以将数组静态地包含在顶层，但是在架构上似乎有些偏离，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 事实中注册用于记录日志文件的路径.您可以在每个角色中执行以下操作:

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'] }}"

角色/角色2/任务看起来像这样:

---
- 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

将产生以下输出:

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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