同一Ansible剧本在不同版本输出不同，如何适配2.5.0rc2版本运行？

Hey there! Let's get that old playbook working with Ansible 2.5.0rc2. Between version 2.0.0.0 and 2.5, Ansible introduced tons of breaking changes, deprecations, and stricter syntax checks. Here are the most common fixes you'll need to apply:

1. Replace Deprecated Modules & Parameters #

Ansible phased out a lot of old syntax and modules in the 2.x updates. Here's what to look for:

• If you're using sudo: yes, swap it for the newer privilege escalation syntax: become: yes and become_method: sudo (the old sudo parameter was deprecated in 2.4).
• Modules like raw have limited use cases now—unless you're setting up a brand new system without Python, replace it with command or shell for better compatibility.
• Check for module-specific deprecations: for example, the apt module's cache_valid_time behavior changed in 2.5, so verify your package update logic still works as intended.

2. Fix Strict YAML Syntax Issues #

Ansible 2.5 enforces stricter YAML rules than 2.0. Common pitfalls:

• Missing spaces after colons: Old lines like key:value will throw errors—make sure to write key: value.
• Inconsistent indentation: Mixing tabs and spaces, or uneven indentation for list/dictionary items, will break parsing. Stick to 2 or 4 spaces consistently.
• Quotation mark conflicts: If you're wrapping variables in quotes (e.g., "{{ my_var }}"), ensure nested quotes are escaped correctly to avoid syntax errors.

3. Adjust for Module Behavior Changes #

Some modules behave differently in newer versions. Here are two frequent issues:

• copy module path handling: In 2.0, relative src paths were based on the playbook directory; now they use your control node's working directory. Fix this by using the {{ playbook_dir }} variable to reference files reliably:

  - copy:
      src: "{{ playbook_dir }}/files/my_config.conf"
      dest: /etc/my_config.conf
  

• file module state checks: If you're creating directories with state: directory, 2.5 will throw an error if the directory exists with mismatched permissions. Add force: yes or update your permission settings to match the target system's existing state.

4. Update Inventory & Connection Variables #

Ansible 2.5 updated inventory and connection plugin behavior:

• Replace old SSH variables like ansible_ssh_user with the newer ansible_user (the old names still work but will trigger deprecation warnings).
• Double-check your inventory file for syntax errors—2.5 is stricter about group definitions and duplicate host entries.

5. Temporary Compatibility Mode (Not Recommended Long-Term) #

If you need a quick fix to test without rewriting everything, enable compatibility mode in your ansible.cfg:

[defaults]
deprecation_warnings = False
command_warnings = False

Note: This hides warnings but won't fix actual breaking changes. Use this only to debug, then update your playbook properly.

6. Debug with Verbose Output #

If you're still hitting errors, run your playbook with verbose logging to pinpoint the issue:

ansible-playbook -vvv your_playbook.yml

The detailed output will tell you exactly which line or module is failing. Cross-reference that with Ansible's version changelogs (focus on 2.1 to 2.5) to find the specific breaking change affecting your code.

For example, a common fix is updating package lists in yum/apt from space-separated strings to lists:

Old 2.0 Syntax: #

- yum: name=nginx php-fpm state=present

New 2.5 Syntax: #

- yum:
    name:
      - nginx
      - php-fpm
    state: present

内容的提问来源于stack exchange，提问作者mahendra