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All I could find was this from the docs:
Additionally,
inventory_hostnameis 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 hostnameansible_hostnameor for other mysterious reasons. If you have a long FQDN,inventory_hostname_shortalso contains the part up to the first period, without the rest of the domain.
Is there any actual difference between inventory_hostname and ansible_hostname variables in Ansible? If so, then which one should I use and when?
874
inventory_hostname takes the hostname from the inventory configuration or the hosts file. this may not match the hostname configuration of the remote system. this could just be a local identity mentioned on the control machine.
With hostvars , you can access variables defined for any host in the play, at any point in a playbook. You can access Ansible facts using the hostvars variable too, but only after you have gathered (or cached) facts.
ansible_play_batch will return the hostname of a managed node, just like the Linux hostname command, in the form of an array of strings. ansible_play_hosts_all will return the hostname of a managed node, just like the Linux hostname command, in the form of an array of strings.
The preferred practice in Ansible is actually not to store variables in the main inventory file. In addition to storing variables directly in the INI file, host and group variables can be stored in individual files relative to the inventory file. These variable files are in YAML format. Valid file extensions include '.
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 DNSansible_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 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.
Important: To use ansible_hostname, you need to gather facts:
gather_facts: true Otherwise, you will get a message that ansible_hostname is not defined.
"ansible_hostname": "VARIABLE IS NOT DEFINED!" Try this with one host to understand the differences
tasks: - debug: var=inventory_hostname - debug: var=ansible_hostname - debug: var=hostvars If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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