Ansible - 多个角色 [英] Ansible - multiple roles

问题描述

我正在尝试使用 with_items 命令运行多个角色，但是出现错误:

I am trying to run multiple roles using with_items command, however I am getting error:

错误！‘项目’未定义"

"ERROR! 'item' is undefined"

role.yml:

---
- hosts: '{{ host }}'
  become: yes

  roles:
    - role: "{{item}}"
      with_items: "{{ roles }}"

这是我的命令:

ansible-playbook -i ./inventory/Dev ./playbooks/role.yml --extra-vars='{"host": "db", "roles": ["mysql", "apache"]}'

推荐答案

你不能这样做.with_ 循环对角色无效.

You cannot do it this way. with_ loops are not valid for roles.

^{如果有的话，你需要为 roles: 指令提供一个角色列表，所以语法就像主机组列表 hosts: '{{ 主机 }}'.问题是:Ansible 没有解析角色的变量，所以 roles: '{{ roles }}' 不起作用.}

^{If anything, you need to provide a list of roles to the roles: directive, so the syntax would be just like for the list of host groups hosts: '{{ host }}'. The problem is: Ansible does not resolve the variable for roles, so roles: '{{ roles }}' does not work.}

但是，您可以做的是使用 include_role 模块您可以在其中访问变量.

What you can do, however, is to use include_role module in which you can access the variables.

^{不，include_role 模块也不会将 with_items 中的 {{ item }} 作为 name 的值.}

^{No, include_role module doesn't take {{ item }} from the with_items as a value for name either.}

所以我能想到的唯一解决方法(假设您不想事先处理 JSON)是静态包含角色:

So the only workaround I can think of (assuming you don't want to process the JSON beforehand) is to the include the roles statically:

tasks:
  - include_role:
      name: "mysql"
    when: "'mysql' in roles"
  - include_role:
      name: "apache"
    when: "'apache' in roles"

无论如何，角色都需要存在于控制机器上，因此它们的所有名称都是预定义的.

The roles need to exist on the control machine anyway, so all their names are predefined.

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