CODEWITHSUNDEEP
ansible
asking
asking

Reputation: 305

How to define different sequential value for different hosts in the same group in Ansible playbook?

Is it possible to define different sequential value for different hosts in the same group?

I have a job with multiple tasks that loops for every hosts in the host group.

For example: my_host group contains 3 hosts A, B, C and 5 tasks

The 5 tasks will run 3 times for each hosts A, B, C

However in 1 variable of the 5 tasks that I have, I want to pass a sequential value for each hosts

So variable 'sequential_var' will have value 1 in host A, value 2 in host B, and value 3 in host C

I have tried

- hosts: my_host
  serial: 1
  tasks:
    - name: task1
      set_fact:
        sequential_var: {{ item }}
      with_sequence: start=1 end=3

the value ended up being 3 for all of the host when i actually want 1 for A, 2 for B and 3 for C

is there anyway for me to achieve what i actually want?

Upvotes: 1

Views: 413

Answers (2)

Vladimir Botka
Vladimir Botka

Reputation: 68074

Q: "The variable 'sequential_var' will have value 1 in host A, value 2 in host B, and value 3 in host C"

A: Given the inventory

shell> cat hosts
[my_host]
A
B
C

Get the index of the host in the group, e.g.

- hosts: my_host
  gather_facts: false
  vars:
    sequential_var: "{{ groups.my_host.index(inventory_hostname) + 1 }}"
  tasks:
    - debug:
        var: sequential_var

gives

ok: [A] => 
  sequential_var: '1'
ok: [B] => 
  sequential_var: '2'
ok: [C] => 
  sequential_var: '3'

The directive serial has no effect on the variable sequential_var. The value of sequential_var will be the index of the host in the group as ordered in the inventory.

Upvotes: 1

Aniket Chopade
Aniket Chopade

Reputation: 841

You are trying to assign variable to hosts.

From ansible documentation

You can store variable values that relate to a specific host or group in inventory. To start with, you may add variables directly to the hosts and groups in your main inventory file. As you add more and more managed nodes to your Ansible inventory, however, you will likely want to store variables in separate host and group variable files

You can do this while you configure your ansible hosts.

myhosts:
  hosts:
    A:
      id: 1
    B:
      id: 2

Upvotes: 0

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