运行剧本时,各种主机上的未定义变量错误“ dict对象”

时间:2018-09-20 13:42:09

标签: ansible ansible-tower ansible-awx

编辑:看来这仅在使用--check参数运行时发生。实时运行此剧本不会引发此错误。但是知道是什么原因造成的还是不错的。

我已经开始使用Ansible AWX来管理一堆服务器,并且以前没有使用过Ansible,尽管我已经看过许多在线教程,并且对此感到很自在。

我正在尝试运行一本将更新安装到多个网络服务器的剧本。

它抛出一个错误,该错误奇怪地出现在不同运行的不同主机上。例如,如果我运行剧本,则主机server3.mydomain.com会因此错误而失败。如果我从清单中删除该服务器,则在server2.mydomain.com上会收到相同的错误,依此类推,等等。

错误输出没有提供足够的信息让我找出失败的原因,即使将其隔离到一小部分,而且我也无法通过在线搜索找到问题。

这是剧本(通过我在网上找到的模板进行了一些更改):

---
- name: ensure services are up before doing anything
  hosts: webservers
  become: true
  any_errors_fatal: true
  serial: 1
  tasks:

- name: upgrade packages and reboot (if necessary)
  hosts: webservers
  become: true
  serial: 1 
  any_errors_fatal: true
  max_fail_percentage: 0

  tasks: 

    - name: apt-get update
      apt:
        update-cache: yes
      changed_when: 0

    - name: get list of pending upgrades
      command: apt-get --simulate dist-upgrade
      args:
        warn: false 
      register: apt_simulate
      changed_when: 0

    - name: parse apt-get output to get list of changed packages
      set_fact: 
        updates: '{{ apt_simulate.stdout_lines | select("match", "^Inst ") | list | sort }}'
      changed_when: 0

    - name: show pending updates
      debug:
        var: updates
      when: updates.0 is defined

    - name: apt-get autoremove
      command: apt-get -y autoremove
      args:
        warn: false
      when: '"Inst linux-image-" in apt_simulate.stdout'
      changed_when: 0

    - name: apt-get dist-upgrade
      apt:
        upgrade: dist 
      register: upgrade_output

    - name: check if reboot needed
      stat: path=/var/run/reboot-required
      register: file_reboot_required

    - meta: end_play
      when: not file_reboot_required.stat.exists

    - name: reboot node
      shell: sleep 2 && shutdown -r now "Reboot triggered by ansible"
      async: 1
      poll: 0
      ignore_errors: true

    - name: wait for node to finish booting
      wait_for_connection:
          connect_timeout=10
          delay=30
          timeout=120

    - name: wait for ssh to start fully
      pause:
        seconds: 45

这是错误:

fatal: [server3.mydomain.com]: FAILED! => {
    "msg": "The task includes an option with an undefined variable. The error was: 'dict object' has no attribute 'stdout_lines'\n\nThe error appears to have been in '/var/lib/awx/projects/_8__infrastructure_management/projects/infrastructure-management/test/test.yml': line 30, column 7, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n    - name: parse apt-get output to get list of changed packages\n      ^ here\n"

因此,错误似乎与此块有关,但除此之外,我还遇到了问题:

- name: parse apt-get output to get list of changed packages
  set_fact: 
    updates: '{{ apt_simulate.stdout_lines | select("match", "^Inst ") | list | sort }}'
  changed_when: 0

在这里看不到我想念的东西。

1 个答案:

答案 0 :(得分:1)

使用--check进行运行无法“试运行” command:shell:模块,因为它无法预测运行安全与否的安全性。因此,由于command:不运行,因此不会在该stdout_lines变量中创建任何apt_simulate。有趣的是,使用debug: var=apt_simulate表明它确实说了apt_simulate.skipped=Trueapt_simulate.msg="remote module (command) does not support check mode"。因此,您可以自己决定是否只想使用updates:来保护when: not apt_simulate.skipped引用,甚至可以保护when: not {{ansible_check_mode}}

值得庆幸的是,您可以通过指定check_mode: no来覆盖command的行为,前提是您可以确定-即使在您的命令中确实可以安全地运行该命令,就像您的命令一样检查模式。