How to deal with errors coming from ansible roles

Question

I have been calling a playbook having multiple roles, each roles signifies a TESTCASE. I need to run the playbook without failing it if one of the role fails during execution. For which I am using ignore_errors: yes. However, this truly ignores error, I need to print at the end the name of the ROLES which are failed ? is it possible ?

- hosts: WEB
  gather_facts: no
  vars:
  roles:
    - { role: CHECK_CONNECTION, ignore_errors: yes, tags: always }
    - { role: CHECK_CPU, ignore_errors: yes, tags: always }
    - { role: CHECK_MEM, ignore_errors: yes, tags: always }

Question: How to execute whole playbook and at the end print the failed roles ?

Answer 1

An option would be to use the rescue section of Blocks

Create include_role.yml

- name: include role
  block:
    - include_role:
        name: "{{ item_my_role }}"
  rescue:
    - set_fact:
        failed_roles: "{{ failed_roles|default([]) + [ item_my_role ] }}"

and loop include_tasks. It is not possible to loop blocks.

vars:
  my_roles:
    - CHECK_CONNECTION
    - CHECK_CPU
    - CHECK_MEM
tasks:
- include_tasks: include_role.yml
  loop: "{{ my_roles }}"
  loop_control:
    loop_var: item_my_role
- debug:
    var: failed_roles|default([])

Use loop_control loop_var and create unique variable, e.g. item_my_role, avoiding potential conflict inside the included role. If the variable is used inside the included role the following rescue section will add the wrong item to the list.