I'm using the following task to check if a host is reachable (after a
reboot):
- name: Wait for host to come back
wait_for:
host: '{{ ansible_host }}'
port: 22
state: started
delay: 30
timeout: 300
delegate_to: localhost
check_mode: False
This works fine for hosts that have ansible_host explicitly set, but for
hosts that don't set ansible_host it's set to "localhost". As far as I
understand ansible_host is the correct variable to use in this situation.
As it should contain the hostname or IP address where the host is reachable.
To clarify the issue, use the following example inventory:
host-a
host-b ansible_host=10.1.2.3
In this case, in the above task ansible_host is set to localhost for host-a
but to 10.1.2.3 for host-b. This leads to wrong behavior as it would check
port 22 on localhost for host-a. I could not find any variable that would
contain the equivalent of ansible_host in a task without delegate_to for
host-a.
Is this behavior expected or a bug in Ansible? Is there a variable I could
use instead to get the connection target in case the task would be run
without delegate_to? I'm currently using the following workaround, but this
is really ugly and breaks if the Ansible behavior changes at some point in
the future:
- name: Wait for host to come back
wait_for:
# ansible_host with delegate_to is weird. It's set to localhost if it
was not set explicitly before.
host: '{{ (ansible_host == "localhost") | ternary(inventory_hostname,
ansible_host) }}'
port: 22
state: started
delay: 30
timeout: 300
delegate_to: localhost
check_mode: False
I found these github issues wich might be related:
https://github.com/ansible/ansible/issues/30630
https://github.com/ansible/ansible/issues/14958
Regards,
Gaudenz
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