Ansible忽略条件

Question

我正在为我的服务器(ubuntu 和 centos 的混合)开发一个 ansible 剧本，如果安装了一个程序，当我尝试为 monit 传输一些配置文件时，我遇到了一个问题。它在我的 centos 机器上完美运行，但在 ubuntu 机器上，无论完全忽略条件，它都会传输模板。

---
- name: Check for Sendmail (Ubuntu)
  shell: dpkg-query -W -f='${Status} ${Version}\n' sendmail
  register: ubuntu_installed
  when: ansible_distribution == 'Debian' or ansible_distribution == 'Ubuntu'
  changed_when: False
  failed_when: "'FAILED' in ubuntu_installed.stderr"

- debug: var=ubuntu_installed

- name: Check for Sendmail (CentOs)
  shell: rpm -qa | grep sendmail
  register: cent_installed
  when: ansible_distribution == 'CentOS' or ansible_distribution == 'Red Hat Enterprise Linux'
  changed_when: False
  failed_when: "'FAILED' in cent_installed.stderr"

- name: Transfer Monit config files for Sendmail (Ubuntu)
  template: src=monit/templates/sendmail.j2 dest=/etc/monit/conf.d/sendmail owner=root group=root mode=644
  when: ubuntu_installed.skipped is not defined and ubuntu_installed.stdout != "" and ansible_distribution == 'Debian' or ansible_distribution == 'Ubuntu'

- name: Transfer Monit config files for Sendmail (CentOs)
  template: src=monit/templates/sendmail.j2 dest=/etc/monit.d/sendmail owner=root group=root mode=644
  when: cent_installed.skipped is not defined and cent_installed.stdout != "" and ansible_distribution == 'CentOS' or ansible_distribution == 'Red Hat Enterprise Linux'

我在其中进行了调试，以检查变量是否正确。当我运行剧本时，我得到...

TASK: [monit | debug var=ubuntu_installed] ************************************
ok: [server1] => {
    "item": "",
    "ubuntu_installed": {
        "changed": false,
        "cmd": "dpkg-query -W -f='${Status} ${Version}\\n' sendmail ",
        "delta": "0:00:00.012985",
        "end": "2014-07-11 16:56:12.688509",
        "failed": false,
        "failed_when_result": false,
        "invocation": {
            "module_args": "dpkg-query -W -f='${Status} ${Version}\\n' sendmail",
            "module_name": "shell"
        },
        "item": "",
        "rc": 1,
        "start": "2014-07-11 16:56:12.675524",
        "stderr": "dpkg-query: no packages found matching sendmail",
        "stdout": "",
        "stdout_lines": []
    }
}

它完全忽略了条件 ubuntu_installed.stdout != ""

Answer 1

这是你的条件:

-  when: ubuntu_installed.skipped is not defined and ubuntu_installed.stdout != "" and ansible_distribution == 'Debian' or ansible_distribution == 'Ubuntu'

你的 precedence不正确:A and B and C or D 表示是(A and B and C)或 D，这不是您想要的。 (注意 Ansible conditionals 使用 Jinja2 expressions ，它反射(reflect)了 Python 条件，所以 here are the precedence rules )。

懒惰的程序员为了清楚起见添加括号；这是修改后的条件:

-  when: (ubuntu_installed.skipped is not defined and ubuntu_installed.stdout != "") and (ansible_distribution == 'Debian' or ansible_distribution == 'Ubuntu')

PS- 你显示了一个命令的输出，debug，但是给 alllll 输出是有帮助的。那是 ansible-playbook -vvv。