ansible delegation to other hosts - ansible

Question

I use ansible 2.1 and I want to run a command to a group of hosts, using delegate_to. I use localhost as the host param and I want to delegate a “touch” command to both of cls hosts
I have the following
---
- hosts: ansible
# gather_facts: yes
tasks:
- debug: var=groups.cls
- name: touch a file to running host
shell: echo {{ item }} >> /tmp/{{ inventory_hostname }}
delegate_to: "{{ item }}"
with_items: "{{ groups.cls }}"
with output:
[root#ansible control]# ansible-playbook -i inventory test.yml
PLAY ***************************************************************************
TASK [setup] *******************************************************************
ok: [ansible]
TASK [debug] *******************************************************************
ok: [ansible] => {
"groups.cls": [
"cls-host-1",
"cls-host-2"
]
}
TASK [touch a file to running host] ********************************************
changed: [ansible -> cls-host-1] => (item=cls-host-1)
changed: [ansible -> cls-host-2] => (item=cls-host-2)
PLAY RECAP *********************************************************************
ansible : ok=3 changed=1 unreachable=0 failed=0
but the touch is done only on the first host:
[root#cls-host-1 ~]# more /tmp/ansible
cls-host-1
cls-host-2
Is anything wrong? Can I delegate the command with any other way?

Answer 1

I've tested a variation of your playbook using Ansible 2.4.0.0:
#!/usr/bin/env ansible-playbook
- hosts: stretch.fritz.box
tasks:
- name: touch
shell: echo {{item}} >>/tmp/{{inventory_hostname}}
delegate_to: "{{item}}"
with_items:
- jessie.fritz.box
- short.fritz.box
This is working fine: the touch is performed on jessie and short
jessie$ cat /tmp/stretch.fritz.box
jessie.fritz.box
short$ cat /tmp/stretch.fritz.box
short.fritz.box
Perhaps this feature was introduced in Ansible between 2.1 and 2.4.