Ansible playbook 上的“何时”条件无法使用运算符按预期工作

Posted 2023-02-19

【中文标题】Ansible playbook 上的“何时”条件无法使用运算符按预期工作

【英文标题】："When" condition on Ansible playbook doesn't work as expected using operators

【发布时间】：2017-09-01 23:03:44

【问题描述】：

下面的剧本使用条件语句和 Ansible 中的运算符。当我运行剧本时，它从不接受/验证条件，而是考虑“shmall”的最后一个 set_fact 值。

---
- hosts: sandbox
  user: robo
  become: yes
  gather_facts: yes
  tasks:
  - debug: msg="ansible_memtotal_mb"

  - name: SHMALL value for MEM less than 16G
    set_fact:
       shmall: 3670016
       when: ansible_memtotal_mb|int <= 16384

  - name: SHMALL value for MEM is between 16G and 32G
    set_fact:
       shmall: 7340032
       when: ansible_memtotal_mb|int > 16384 and ansible_memtotal_mb|int <= 32768

  - debug: var=shmall

================================================================================
SUDO password:

PLAY [sandbox] *****************************************************************

TASK [setup] *******************************************************************
ok: [uslv-sapp-lnx11]

TASK [debug] *******************************************************************
ok: [uslv-sapp-lnx11] => 
    "msg": 7872


TASK [SHMALL value for MEM less than 16G] **************************************
ok: [uslv-sapp-lnx11]

TASK [SHMALL value for MEM is between 16G and 32G] *****************************
ok: [uslv-sapp-lnx11]

TASK [debug] *******************************************************************
ok: [uslv-sapp-lnx11] => 
    "shmall": 7340032


PLAY RECAP *********************************************************************
uslv-sapp-lnx11            : ok=5    changed=0    unreachable=0    failed=0

【参考方案1】：

修正缩进。 when 不是 set_fact 动作的参数，而是任务的参数：

- name: SHMALL value for MEM less than 16G
  set_fact:
    shmall: 3670016
  when: ansible_memtotal_mb|int <= 16384

- name: SHMALL value for MEM is between 16G and 32G
  set_fact:
    shmall: 7340032
  when: ansible_memtotal_mb|int > 16384 and ansible_memtotal_mb|int <= 32768