How to write dynamic variable in Ansible playbook

Question

Based on extra vars parameter I Need to write variable value in ansible playbook  ansible-playbook playbook yml -e  param1 value1 param2 value2 param3 value3    If only param1 passed  myvariable   param1      If only param1 param2 passed  myvariable   param1 param2     If param1 param2 param3 are passed then variable value will be  myvariable   param1 param2 param3     When I try to create variable dynamically through template then my playbook always takes previous variable value  But inside  dest roles myrole vars main yml its writing correct value    What I make a try here   - hosts  local   user  roop   gather facts  yes   connection  local    tasks      - template  src roles myrole templates myvar j2 dest roles myrole vars main yml    - debug  var myvariable    roles          -   role  myrole     So inside myrole directory I have created template and vars  - roles   - myrole     - vars main yml     - templates myvar j2    templates myvar j2      if param1 is defined and param2 is defined and param3 is defined      myvariable   param1 param2 param3     elif param1 is defined and param2 is defined      myvariable   param1 param2     elif param1 is defined      myvariable   param1     else      myvariable   default-param     endif       As I know if only two condition then I can do this using inline expression like below      param1 param2  if param1 is defined and param2 is defined else  default-param        lt do something gt  if  lt something is true gt  else  lt do something else gt   Is it possible if - elif - else in inline expression like above  Or any other way to assign value dynamically in ansible playbook

User · Answer

I would first suggest that you step back and look at organizing your plays to not require such complexity  but if you really really do  use the following      vars      myvariable      param1 default      param2 default      param3 default      join

User · Answer

my var  the variable declared  VAR  the variable  whose value is to be checked  param 1  param 2  values of the variable VAR  value 1  value 2  value 3  the values to be assigned to my var according to the values of my var  my var       value 1  if VAR     param 1  else  value 2  if VAR     param 2  else  value 3

User · Answer

I am sure there is a smarter way for doing what you want but this should work   - name           Test var   hosts          all   gather facts   no   vars      myvariable   false   tasks      - name  param1       set fact          myvariable     param1          when  param1 is defined      - name  param2       set fact          myvariable      param2 if not myvariable else myvariable         param2           when  param2 is defined      - name  param3       set fact          myvariable      param3 if not myvariable else myvariable         param3           when  param3 is defined      - name  default       set fact          myvariable   default        when  not myvariable      - debug         var myvariable   Hope that helps  I am not sure if you can construct variables dynamically and do this in an iterator  But you could also write a small python code or any other language and plug it into ansible

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