when条件判断

示例剧本

如果剩余内存小于70，关闭防火墙服务

---
-   hosts: all
    name: test
    tasks: 
    -   name: 关闭firewalld服务
        service:
            name: firewalld
            state: stopped
            enabled: no
        when: ansible_memfree_mb<70 # 如果剩余内存小于70，执行任务：关闭firewalld服务