Ansible: how-to do math and get an integer?

Question

If we assume that ansible_memtotal_mb is an odd number

- debug: msg="{{ ansible_memtotal_mb }}"

How can I divide ansible_memtotal_mb by 2, and convert the result to an integer:

- debug: msg="{{ ansible_memtotal_mb * 0.5 | int }}"

Obviously the latter did not work, because (if I am not mistaken) ansible_memtotal_mb * 0.5 returns a string and using the int filter, results to 0

Could you please advise?

Answer 1

You applied int filter to the value 0.5.

You wanted to apply to the result of the expression, so:

- debug: msg="{{ (ansible_memtotal_mb * 0.5) | int }}"