是否可以在 Ansible 中仅收集特定事实？

Question

在 Ansible 中，我可以使用 gather_facts: yes 来收集有关我的主机的信息。由于gather_facts收集的资料较多，所以需要相当长的时间。就我而言，我只需要一个事实：ansible_env.TEMP。我可以通过获取这个特定值来加快 gather_facts 进程吗？我目前的剧本：

---
- hosts: all
  gather_facts: yes
  tasks:
    - name: Get TEMP
      debug:
        msg: "TEMP: {{ ansible_env.TEMP }}"

作为解决方法，我可以将 gather_facts 设置为 no 并通过 shell 命令提取值，但这感觉不像是使用 Ansible...

Answer 1

根据 setup – Gathers facts about remote hosts if the parameter gather_subset 的文档提供了一个子集

restrict the additional facts collected to the given subset.

---
- hosts: localhost
  become: false

  gather_facts: true
  gather_subset:
    - "env"
    - "!all"
    - "!min"

  tasks:

  - name: Show Gathered Facts
    debug:
      msg: "{{ ansible_facts }}"

导致输出

TASK [Show Gathered Facts] ******
ok: [localhost] =>
  msg:
    env:
      HISTCONTROL:
      HISTSIZE:
      HOME:
      HOSTNAME:
      KRB5CCNAME:
      LANG:
      LESSOPEN:
      LOGNAME:
      LS_COLORS:
      MAIL:
      PATH:
      PWD:
      SELINUX_LEVEL_REQUESTED:
      SELINUX_ROLE_REQUESTED:
      SELINUX_USE_CURRENT_RANGE:
      SHELL:
      SHLVL:
      SSH_CLIENT:
      SSH_CONNECTION:
      SSH_TTY:
      TERM:
      TZ:
      USER:
      XDG_RUNTIME_DIR:
      XDG_SESSION_ID:
      _:
    gather_subset:
    - env
    - '!all'
    - '!min'
    module_setup: true

...我只提供了键并删除了所有值。由于 lib/ansible/module_utils/facts/system/env.py.

，密钥可能会随基础架构而变化

但是，这可能仍会提供比您正在寻找的更多信息。

更多文档

Ansible Issue #63891 - "Since Ansible 2.8, it is possible to define a list of facts modules 将由 gather_facts 模块运行。"
Ansible Issue #47603 - "setup.py gather_facts 文档不完整"
How to access environment variable values in Python application

进一步问答

Getting full name of the OS using Ansible facts
Save only part of facts in Ansible

Answer 2

您可以使用 gather_subset，只获取环境变量：

- hosts: localhost
  gather_subset: ['env','!all','!min']

  tasks:
    - debug:
        msg: "{{ ansible_facts }}"

输出：

TASK [debug] **************************************************************************************************************************************************************************
ok: [localhost] => {
    "msg": {
        "env": {
                ... vars here...
        },
        "gather_subset": [
            "env",
            "!all",
            "!min"
        ],
        "module_setup": true
    }
}

gather_subset 允许的选项：全部、all_ipv4_addresses、all_ipv6_addresses、apparmor、体系结构、caps、chroot、cmdline、date_time、default_ipv4、default_ipv6, 设备, 分布, distribution_major_version, distribution_release, distribution_version, dns, effective_group_ids, effective_user_id, env, facter, fibre_channel_wwn 、fips、硬件、接口、is_chroot、iscsi、内核、kernel_version、本地、lsb、机器、machine_id、安装、网络、nvme、ohai、os_family、pkg_mgr、平台、处理器、processor_cores、processor_count、python、python_version、real_user_id、selinux、service_mgr、ssh_host_key_dsa_public, ssh_host_key_ecdsa_public, ssh_host_key_ed25519_public, ssh_host_key_rsa_public, ssh_host_pub_keys, ssh_pub_keys, 系统, system_capabilities, system_capabilities_enforced, 用户, user_dir、user_gecos、user_gid、user_id、user_shell、user_uid、虚拟、virtualization_role、virtualization_tech_guest、 virtualization_tech_host, virtualization_type"

是否可以在 Ansible 中仅收集特定事实？

Is it possible to gather only specific facts in Ansible?

ansible

environment-variables

ansible-facts