如何在Ansible中遍历库存并赋值

Question

# In tasks file - roles/company/tasks/main.yml
- name: change hostname
  win_hostname:
    name: "{{ item }}"
  loop: "{{ hostname }}"
  register: res

# In the Inventory file
[company]
10.0.10.128
10.0.10.166
10.0.10.200

# In vars - roles/company/vars/main.yml
hostname:
  - GL-WKS-18
  - GL-WKS-19
  - GL-WKS-20

# site.yml file located under /etc/ansible
- hosts: company
  roles:
    - common
    - company #This is where the loop exists mentioned above.

# Command to run playbook
ansible-playbook -i hosts company.yml

- name: change hostname
  win_hostname:
    name: "{{ item.1 }}"
  loop: {{ groups.company|zip(hostname)|list }}"
  register: res

然而，我得到的输出是不正确的，这不应该运行9次，而是只运行3次，在库存中的[公司]组中的每个IP一次。另外，列表中只有三个主机名需要分配给清单表中的每个主机。

changed: [10.0.10.128] => (item=[u'10.0.10.128', u'GL-WKS-18'])
changed: [10.0.10.166] => (item=[u'10.0.10.128', u'GL-WKS-18'])
changed: [10.0.10.200] => (item=[u'10.0.10.128', u'GL-WKS-18'])
changed: [10.0.10.128] => (item=[u'10.0.10.166', u'GL-WKS-19'])
changed: [10.0.10.166] => (item=[u'10.0.10.166', u'GL-WKS-19'])
changed: [10.0.10.200] => (item=[u'10.0.10.166', u'GL-WKS-19'])
ok: [10.0.10.128] => (item=[u'10.0.10.200', u'GL-WKS-20'])
ok: [10.0.10.166] => (item=[u'10.0.10.200', u'GL-WKS-20'])
ok: [10.0.10.200] => (item=[u'10.0.10.200', u'GL-WKS-20'])

Answer 1

每当我对Ansible中的循环有问题时，我也会访问循环文档。听起来像是要并行迭代两个列表，将清单中主机列表中的一个项目与主机名列表中的一个项目配对。在以前版本的Ansible中，建议使用with_together循环，而在最近版本的Ansible中，建议使用zip过滤器（这里的文档中有一个示例）。

为了为您的用例演示这一点，我从一个包含三个主机的清单文件开始：

[mygroup]
hostA ansible_host=localhost
hostB ansible_host=localhost
hostC ansible_host=localhost

和下面的剧本：

---
- hosts: all

- hosts: localhost
  gather_facts: false
  vars:
    hostnames:
      - hostname01
      - hostname02
      - hostname03
  tasks:
    - name: change hostname
      debug:
        msg:
          win_hostname:
            name: "{{ item }}"
      loop: "{{ groups.mygroup|zip(hostnames)|list }}"

ansible-playbook -i hosts playbook.yml

TASK [change hostname] ********************************************************************************************************************************
ok: [localhost] => (item=[u'hostA', u'hostname01']) => {
    "msg": {
        "win_hostname": {
            "name": [
                "hostA", 
                "hostname01"
            ]
        }
    }
}
ok: [localhost] => (item=[u'hostB', u'hostname02']) => {
    "msg": {
        "win_hostname": {
            "name": [
                "hostB", 
                "hostname02"
            ]
        }
    }
}
ok: [localhost] => (item=[u'hostC', u'hostname03']) => {
    "msg": {
        "win_hostname": {
            "name": [
                "hostC", 
                "hostname03"
            ]
        }
    }
}

如您所见，它将清单中的每个主机与hostnames列表中的主机名配对。

更新

根据您提供的其他信息，我认为您真正想要的是：

    - name: change hostname
      win_hostname:
        name: "{{ hostnames[group.company.index(inventory_hostname) }}"