ventory_hostname和ansible_hostname有什么区别 [英] What's the difference between inventory_hostname and ansible_hostname

问题描述

我只能从

此外，inventory_hostname是在Ansible的清单主机文件中配置的主机名的名称.当您不想依赖发现的主机名ansible_hostname或其他神秘原因时，此功能很有用.如果您的FQDN较长，则inventory_hostname_short还将包含直到第一个期间的部分，而没有域的其余部分.

Additionally, inventory_hostname is the name of the hostname as configured in Ansible’s inventory host file. This can be useful for when you don’t want to rely on the discovered hostname ansible_hostname or for other mysterious reasons. If you have a long FQDN, inventory_hostname_short also contains the part up to the first period, without the rest of the domain.

Ansible中的inventory_hostname和ansible_hostname变量之间是否有实际区别?如果是这样，那我应该使用哪一个?何时使用?

Is there any actual difference between inventory_hostname and ansible_hostname variables in Ansible? If so, then which one should I use and when?

推荐答案

• inventory_hostname-与ansible库存文件中的配置相同(例如:/etc/ansible/hosts).可以是IP地址，也可以是DNS可以解析的名称
• ansible_hostname-由ansible发现. Ansible ssh进入了主机并收集了一些事实.作为事实的一部分，它还会发现存储在ansible_hostname中的主机名.
• inventory_hostname - As configured in the ansible inventory file (eg: /etc/ansible/hosts). It can be an IP address or a name that can be resolved by the DNS
• ansible_hostname - As discovered by ansible. Ansible ssh's into the host and gathers some facts. As part of the fact, it also discovers its hostname which is stored in ansible_hostname.

hostvars是一个字典，其中包含每个清单主机的条目.如果要访问主机信息，则需要使用inventory_hostname.如果要使用/打印主机上配置的主机名，则应使用ansible_hostname，因为很可能在清单文件中使用IP.

hostvars is a dictionary which has an entry for each inventory host. If you want to access host information, you need to use the inventory_hostname. If you want to use/print the name of the host as configured on the host, you should use ansible_hostname since most likely the IP will be used in the inventory file.

重要:要使用ansible_hostname，您需要收集事实:

Important: To use ansible_hostname, you need to gather facts:

gather_facts: true

否则，您将收到一条消息，提示未定义ansible_hostname.

Otherwise, you will get a message that ansible_hostname is not defined.

"ansible_hostname": "VARIABLE IS NOT DEFINED!"

与一位主持人一起尝试以了解差异

Try this with one host to understand the differences

  tasks:
    - debug: var=inventory_hostname
    - debug: var=ansible_hostname
    - debug: var=hostvars

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