Re: [ansible-project] Unable to get remote target hostname when using delegate_to

[Kai Stian Olstad]

On Wed, Mar 25, 2020 at 10:41:35PM -0700, Shifa Shaikh wrote:
> ---
> hosts: remote_hosts
>   tasks:
> - name: Generate JSON data
>   lineinfile:
> path: "{{ playbook_dir }}/tmpfiles/stats.yml"
> line: "{{ inventory_hostname }}_{{ item.mount }}: {{ (100 * 
> ((item.size_total - item.size_available) / item.size_total)) | round(1, 
> 'common') }}"
> insertafter: EOF
>   delegate_to: localhost
>   when: item.mount == '/tmp'
>   with_items: '{{ ansible_mounts }}'
> 
> 
> I wish to get the target hostname_mountname in the stats.yml
> 
> Thus if the remote_hosts are
> 
> 10.0.0.2
> > 10.0.0.3
> > 10.0.0.5
> 
> 
> My stats.yml should have the below entries (Expected Output):
> 
> 10.0.0.2_/tmp: 54
> > 10.0.0.3_/tmp: 42
> > 10.0.0.5_/tmp: 65
> 
> 
> However, after using lineinfile and delegate_to it always prints localhost
> 
> localhost:/tmp: 54
> > localhost_/tmp: 42
> > localhost_/tmp: 65

Delegate to localhost does not change inventory_hostname, if it did it would 
break a lot of code out there.
And I can prove it with this code that mimic you codes behavior.

$ more test.yml
---
- hosts: a1,a2
  gather_facts: no
  become: no
  vars:
myvar:
  - value1
  - value2
  - value3
  tasks:
- lineinfile:
path: /tmp/test
line: "{{ inventory_hostname }} {{ item }}"
insertafter: EOF
create: true
  delegate_to: localhost
  when: item == "value2"
  with_items: "{{ myvar }}"

And by running it I get

$ ansible-playbook test.yml; echo "Content of /tmp/test:"; cat /tmp/test

PLAY [a1,a2] ***

TASK [lineinfile] **
skipping: [a1] => (item=value1) 
skipping: [a2] => (item=value1) 
changed: [a1 -> localhost] => (item=value2)
skipping: [a1] => (item=value3) 
changed: [a2 -> localhost] => (item=value2)
skipping: [a2] => (item=value3) 

PLAY RECAP *
a1 : ok=1changed=1unreachable=0failed=0
a2 : ok=1changed=1unreachable=0failed=0

Content of /tmp/test:
a1 value2
a2 value2


-- 
Kai Stian Olstad

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[ansible-project] Unable to get remote target hostname when using delegate_to

[Shifa Shaikh]

Below playbook gets the disk usage percentage of '/tmp' from a list of 
remote_hosts [20 remote servers] and stores it locally (delegate_to) in a 
file {{ playbook_dir }}/tmpfiles/stats.yml

---
hosts: remote_hosts
  tasks:
- name: Generate JSON data
  lineinfile:
path: "{{ playbook_dir }}/tmpfiles/stats.yml"
line: "{{ inventory_hostname }}_{{ item.mount }}: {{ (100 * 
((item.size_total - item.size_available) / item.size_total)) | round(1, 
'common') }}"
insertafter: EOF
  delegate_to: localhost
  when: item.mount == '/tmp'
  with_items: '{{ ansible_mounts }}'


I wish to get the target hostname_mountname in the stats.yml

Thus if the remote_hosts are

10.0.0.2
> 10.0.0.3
> 10.0.0.5


My stats.yml should have the below entries (Expected Output):

10.0.0.2_/tmp: 54
> 10.0.0.3_/tmp: 42
> 10.0.0.5_/tmp: 65


However, after using lineinfile and delegate_to it always prints localhost

localhost:/tmp: 54
> localhost_/tmp: 42
> localhost_/tmp: 65


I tried using {{ ansible_host }} instead of {{ inventory_hostname }} but it 
always prints localhost instead of the target from where it is fetching the 
disk usage information.

Note: if I remove delegate_to then it prints the remote IP fine but then I 
wish the file to be created locally and not on the remote host.

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