如何创建 Ansible playbook 以获取远程主机的操作系统版本? [英] how to create Ansible playbook to obtain OS versions of the remote hosts?

问题描述

我是 ansible 的新手.我有一个要求，要求我为 AWS 中托管的 450 多个 linux 服务器提取操作系统版本.AWS 不提供此功能 - 而是建议我们从 puppet 或 Chef 那里获取它.

I'm new to ansible. I have a requirement that requires me to pull OS version for of more than 450 linux severs hosted in AWS. AWS does not provide this feature - it rather suggests us to get it from puppet or chef.

我创建了一些无法运行的简单剧本

I created few simple playbooks which does not run

---
- hosts: testmachine
user: ec2-user
sudo: yes
tasks:
- name: Update all packages to latest
yum: name=* state=latest

task:
- name: obtain OS version
shell: Redhat-release

playbook 应该输出一个带有主机名和操作系统版本的文本文件.对此的任何见解将不胜感激.

playbook should output a text file with hostname and OS version. Any insight on this will be highly appreciated.

推荐答案

使用以下 Jinja2 表达式之一:

Use one of the following Jinja2 expressions:

{{ hostvars[inventory_hostname].ansible_distribution }}
{{ hostvars[inventory_hostname].ansible_distribution_major_version }}
{{ hostvars[inventory_hostname].ansible_distribution_version }}

哪里:

• hostvars 和 ansible_... 是内置的并由 Ansible 自动收集
• ansible_distribution 是 Ansible 正在处理的主机

• hostvars and ansible_... are built-in and automatically collected by Ansible
• ansible_distribution is the host being processed by Ansible

例如，假设您对运行 CentOS 7 发行版的主机 host.example.com 运行 Ansible 角色 test_role:

For example, assuming you are running the Ansible role test_role against the host host.example.com running a CentOS 7 distribution:

---
- debug:
    msg: "{{ hostvars[inventory_hostname].ansible_distribution }}"
- debug:
    msg: "{{ hostvars[inventory_hostname].ansible_distribution_major_version }}"
- debug:
    msg: "{{ hostvars[inventory_hostname].ansible_distribution_version }}"

会给你:

TASK [test_role : debug] *******************************************************
ok: [host.example.com] => {
    "msg": "CentOS"
}

TASK [test_role : debug] *******************************************************
ok: [host.example.com] => {
    "msg": "7"
}

TASK [test_role : debug] *******************************************************
ok: [host.example.com] => {
    "msg": "7.5.1804"
}

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