inventory_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 文档:

此外，inventory_hostname 是 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 或出于其他神秘原因时，这可能很有用.如果您有一个长 FQDN，inventory_hostname_short 还包含直到第一个句点的部分，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 变量之间有什么实际区别吗?如果是这样，那么我应该使用哪一种以及何时使用?

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 - 在 ansible 清单文件中配置(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 进入主机并收集一些事实.作为事实的一部分，它还会发现其存储在 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，其中包含每个库存主机的条目.如果要访问主机信息，则需要使用inventory_hostname.如果您想使用/打印在主机上配置的主机名称，您应该使用 ansible_hostname，因为 IP 很可能会在清单文件中使用.

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，指出 ansible_hostname 未定义.

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

"ansible_hostname": "VARIABLE IS NOT DEFINED!"

与一台主机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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