始终使用 Ansible 在单个主机上运行任务? [英] Running a task on a single host always with Ansible?

问题描述

我正在编写一个从特定位置下载数据库转储的任务.它将始终在同一主机上运行.

I am writing a task to download a database dump from a specific location. It will always be run on the same host.

所以我在主要剧本中包含如下任务:

So I am including the task as follows in the main playbook:

tasks:
  include: tasks/dl-db.yml

任务内容为:

---
   - name: Fetch the Database
     fetch: src=/home/ubuntu/mydb.sql.gz dest=/tmp/mydb.sql.bz fail_on_missing=yes

但我希望它从单个特定主机而不是所有主机获取.

But I want it to fetch from a single specific host not all hosts.

任务是否是解决此问题的正确方法?

Is a task the right approach for this?

推荐答案

如果您只需要运行一次而不是在每个主机上运行，​​您可以改用 run_once 像这样:

If all you need to happen is that it's only run once rather than on every host you can instead use run_once like so:

---
   - name: Fetch the Database
     run_once: true
     fetch: src=/home/ubuntu/mydb.sql.gz dest=/tmp/mydb.sql.bz fail_on_missing=yes

这将从运行该任务的第一台主机运行.如果您想专门针对特定主机，您可以使用 delegate_to 进一步限制:

This will then be run from the first host that runs the task. You can further limit this with delegate_to if you want to specifically target a specific host:

---
   - name: Fetch the Database
     run_once: true
     delegate_to: node1
     fetch: src=/home/ubuntu/mydb.sql.gz dest=/tmp/mydb.sql.bz fail_on_missing=yes

这篇关于始终使用 Ansible 在单个主机上运行任务?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！