Ansible: how to construct a variable from another variable and then fetch it's value

Question

Here is my problem I need to use one variable 'target_host' and then append '_host' to it's value to get another variable name whose value I need. If you look at my playbook. Task nbr 1,2,3 fetch the value of variable however nbr 4 is not able to do what I expect. Is there any other way to achieve the same in ansible?

   ---     - name: "Play to for dynamic groups"       hosts: local        vars:         - target_host: smtp         - smtp_host: smtp.max.com       tasks:         - name: testing           debug: msg={{ target_host }}         - name: testing           debug: msg={{ smtp_host }}         - name: testing           debug: msg={{ target_host }}_host         - name: testing           debug: msg={{ {{ target_host }}_host }}   Output:  TASK: [testing] ***************************************************************  ok: [127.0.0.1] => {     "msg": "smtp" }  TASK: [testing] ***************************************************************  ok: [127.0.0.1] => {     "msg": "smtp.max.com" }  TASK: [testing] ***************************************************************  ok: [127.0.0.1] => {     "msg": "smtp_host" }  TASK: [testing] ***************************************************************  ok: [127.0.0.1] => {     "msg": "{{{{target_host}}_host}}" } 

Answer 1

If you have a variable like

vars: myvar: xxx xxx_var: anothervalue

the working Ansible syntax:

- debug: msg={{ vars[myvar + '_var'] }}

will give you the analogue of:

- debug: msg={{ xxx_var }}