如何在ansible中忽略警告

Question

在编写攻略时，我一直试图忽略一个警告，场景是我执行此virt-host-validate qemu时，它抛出一个警告，如下所示。

root@n0:~/playbook_promenade# virt-host-validate 
QEMU: Checking for hardware virtualization : PASS
QEMU: Checking if device /dev/kvm exists :PASS
QEMU: Checking if device /dev/kvm is accessible : PASS
QEMU: Checking if device /dev/vhost-net exists : PASS
QEMU: Checking if device /dev/net/tun exists : PASS
QEMU: Checking for cgroup 'memory' controller support : PASS
QEMU: Checking for cgroup 'memory' controller mount-point : PASS
QEMU: Checking for cgroup 'cpu' controller support : PASS
QEMU: Checking for cgroup 'cpu' controller mount-point: PASS
QEMU: Checking for cgroup 'cpuacct' controller support : PASS
QEMU: Checking for cgroup 'cpuacct' controller mount-point : PASS
QEMU: Checking for cgroup 'devices' controller support : PASS
QEMU: Checking for cgroup 'devices' controller mount-point : PASS
QEMU: Checking for cgroup 'net_cls' controller support : PASS
QEMU: Checking for cgroup 'net_cls' controller mount-point : PASS
QEMU: Checking for cgroup 'blkio' controller support : PASS
QEMU: Checking for cgroup 'blkio' controller mount-point : PASS
QEMU: Checking for device assignment IOMMU support  : WARN (No ACPI DMAR table found, IOMMU either disabled in BIOS or not supported by this hardware platform)`

我写的攻略如下。

`- hosts: localhost
   sudo: yes
   tasks:
    - name: Check if Host supports Virtualization.
      command: virt-host-validate qemu 
      ignore_errors: yes
      failed_when: false
      changed_when: false
      register: host_status
    - debug:
       msg: "status: {{host_status.stdout}}"`

现在令人担忧的部分是，如果除了警告之外还有任何其他任务失败，本攻略在我们使用ignore_errors: yes时仍在继续，有人能指导我如何修复它吗?？提前谢谢。

Answer 1

我可以用这个修好它。

  tasks:
   - name: Check if Host supports Virtualization.
     command: virt-host-validate qemu
     register: command_result
     failed_when:
       - "'FAIL' in command_result.stderr"

Answer 2

您还可以在整个角色上将其作为post任务运行，因此该角色中的每个任务都将被验证，并且只有当它具有非零返回代码或包含"error“或" fail”的STDERR时，任务才会失败。

在所有命令/shell任务上，注册输出：

- name: A shell task
  shell: |
    # your commands ...
  register: out

然后在主角色上，添加一个将在每个任务之后检查错误的post- task：

- name: A role of shell/command tasks
  roles:
  - role: ...
  ...
  post_tasks:
  - name: Checking if command failed, or if stderr contains errors/failures
    fail: msg={{ out.stderr.split('\n') }}
    when: out is defined and out.stderr is defined and (out.stderr | lower | regex_search('error|fail') or out.rc != 0)