编辑：似乎这只发生在使用--check参数运行时。实时运行此剧本不会引发此错误。但最好知道是什么原因造成的。
我开始使用 Ansible AWX 来管理一堆服务器并且以前没有使用过 Ansible，尽管我已经阅读了许多在线教程并且感觉很舒服。
我正在尝试运行一个将更新安装到多个网络服务器的剧本。
它抛出了一个错误，奇怪地出现在不同的主机上不同的运行。例如，如果我运行 playbook，主机会server3.mydomain.com因此错误而失败。如果我从库存中删除该服务器，那么我会在 上得到相同的错误server2.mydomain.com，依此类推。
错误输出没有提供足够的信息让我找出失败的原因，即使它将它隔离到一个小部分，而且我还没有设法通过在线搜索找到问题。
这是剧本（来自我在网上找到的模板，有一些更改）：
---
- 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"
所以，错误似乎与这个块有关，但除此之外我被困住了：
- 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
看不到我在这里缺少什么。