Ansible 总和寄存器值

Question

如何使用 Jinja2 过滤 ansible 获取两个主机的总和主机 1 和主机 2

---
- name: Count Check
  hosts: MYGROUP
  gather_facts: true
  user: sv_admin
  tasks:
    - name: count check
      shell: cat /etc/hosts | wc -l
      register: command_result
    - debug:
        var: command_result.stdout
    - set_fact:
        total_result: "{{ command_result.stdout | map('int') | sum(start=0) }}"
    - debug:
        msg: "Total count: {{ total_result }}"

剧本输出

TASK [debug] *****************************************************************
ok: [Host-01] => {
  "msg": "Total count:      134"
}
ok: [Host-02] => {
  "msg": "Total count:      133"
}

Answer 1

您可以使用自定义统计信息来做到这一点：https://docs.ansible.com/ansible/latest/modules/set_stats_module.html

所以对于你的情况，它看起来像

---
- name: Count Check
  hosts: MYGROUP
  gather_facts: true
  user: sv_admin
  tasks:
    - name: count check
      shell: cat /etc/hosts | wc -l
      register: command_result
    - debug:
        var: command_result.stdout
    - set_fact:
        host_result: "{{ command_result.stdout }}"
    - debug:
        msg: "Count for this host: {{ host_result }}"
    - set_stats:
        data: "{{ { 'total_count': host_result | int } }}"

然后如果你运行它与 ANSIBLE_SHOW_CUSTOM_STATS=yes 它会在最后显示结果：

$ ANSIBLE_SHOW_CUSTOM_STATS=yes ansible-playbook -i inventory pb.yml
... (usual output)

CUSTOM STATS: *************************************************************

    RUN: { "total_count": 267}

set_stats 任务默认将所有主机的结果加在一起，这就是您要查找的内容。你需要确保这些值是整数，因为如果它们是字符串，它只会将它们连接起来，你最终会得到类似 RUN: { "total_count": "134133"} 的结果。这就是为什么我按照我的方式放置 data: 位的原因 - 如果您尝试在常规 yaml 中创建字典，例如

  data:
    total_count: "{{ host_result | int }}"

你会看到该值仍然是一个字符串（由于 yaml/jinja 的工作方式）并且它不会正常工作。

Answer 2

使用extract and sum。例如下面的剧本

shell> cat playbook.yml
- hosts: test_01:test_03
  gather_facts: false
  tasks:
    - shell: cat /etc/hosts | wc -l
      register: command_result
    - debug:
        var: command_result.stdout
    - set_fact:
        total_result: "{{ ansible_play_hosts_all|
                          map('extract', hostvars, ['command_result', 'stdout'])|
                          map('int')|
                          sum }}"
      run_once: true
    - debug:
        var: total_result

给出（删节）

shell> ansible-playbook playbook.yml 

PLAY [test_01:test_03] ****

TASK [shell] ****
changed: [test_01]
changed: [test_03]

TASK [debug] ****
ok: [test_01] => {
    "command_result.stdout": "      62"
}
ok: [test_03] => {
    "command_result.stdout": "      31"
}

TASK [set_fact] ****
ok: [test_01]

TASK [debug] ****
ok: [test_03] => {
    "total_result": "93"
}
ok: [test_01] => {
    "total_result": "93"
}

见serial
查看ansible_play_hosts and ansible_play_hosts_all

Ansible 总和寄存器值

Ansible sum register value

jinja2

ansible