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How can we delegate tasks in Ansible?

Glorious Goldfinch answered on December 20, 2022 Popularity 1/10 Helpfulness 1/10

answer How can we delegate tasks in Ansible?

How can we delegate tasks in Ansible?

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Task delegation is an important feature of Ansible since 
there might be use cases where we would 
want to perform a task on one host with reference to other hosts. 
We can do this using the delegate_to keyword. 
For example, if we want to manage nodes in a load balancer pool we can do:
1- hosts: webservers
2 serial: 5
3 
4 tasks:
5- name: Take machine out of ELB pool
6  ansible.builtin.command: /usr/bin/take_out_of_pool {{ inventory_hostname }}
7  delegate_to: 127.0.0.1
8  
9- name: Actual steps would go here
10  ansible.builtin.yum:
11    name: acme-web-stack
12    state: latest
13    
14- name: Add machine back to ELB pool
15  ansible.builtin.command: /usr/bin/add_back_to_pool
{{ inventory_hostname }}
16  delegate_to: 127.0.0.1
We are also defining serial to control the number of 
hosts executing at one time. 
There is another shorthand syntax called local_action 
which can be used instead of delegate_to. 
1...
2tasks:
3   - name: Take machine out of ELB pool
4     local_action: ansible.builtin.command 
/usr/bin/take_out_of_pool {{ inventory_hostname }}
5...
But there are few exceptions also such as include, add_host, 
and debug tasks that cannot be delegated.

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Contributed on Dec 20 2022

Glorious Goldfinch

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How can we delegate tasks in Ansible?

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