如何从Ansible输出提取指定内容并存储为变量用于Jinja2模板

Got it, here's a straightforward way to pull the status ("OK") and uptime ("3m") from sudo monit status output and store them in variables for your Jinja2 templates:

Step 1: Capture the Monit Status Output #

First, run the monit status command with sudo and register the output to a variable so we can process it later:

- name: Fetch Monit status details
  ansible.builtin.command: sudo monit status
  become: true
  register: monit_status_result

Step 2: Extract the System Status (Variable A) #

Use Ansible's regex_search filter to yank the "OK" status from the output. The regex targets the specific line with your server's system status:

- name: Set variable A with system status
  ansible.builtin.set_fact:
    var_A: "{{ monit_status_result.stdout | regex_search('System \\'server\\' status (\\w+)', '\\1') | first }}"

• The regex System \\'server\\' status (\\w+) matches the exact line segment and captures the status word (like "OK") into a group.
• | first grabs the first match (since regex_search returns a list of matches here).

Step 3: Extract the Uptime (Variable B) #

Similarly, extract the uptime value using another regex to target the "uptime: 3m" part of the output:

- name: Set variable B with Monit uptime
  ansible.builtin.set_fact:
    var_B: "{{ monit_status_result.stdout | regex_search('Monit \\d+\\.\\d+\\.\\d+ uptime: (\\d+m)', '\\1') | first }}"

• The regex Monit \\d+\\.\\d+\\.\\d+ uptime: (\\d+m) matches the Monit version line and captures the uptime value (like "3m").

Use Variables in Jinja2 Templates #

Once you've set var_A and var_B, you can reference them directly in your templates like this:

System Status: {{ var_A }}
Monit Uptime: {{ var_B }}

A quick heads-up: If your server's hostname in the Monit output isn't "server", adjust the regex to match your actual hostname. Also, if the uptime format ever changes (e.g., to "1h30m"), you can tweak the regex to (\\d+[hm]) to capture both hours and minutes.

内容的提问来源于stack exchange，提问作者Romain