There are many cases where, for one reason or another, you want your playbook and roles to carry on in case one or more tasks fail. A typical example of this could be that you want to check whether software is installed or not. Let's look at the following example to install Java 11 if, and only if, Java 8 is not installed. In the roles/java/tasks/main.yaml file, we are going to enter the following code:
- name: Verify if Java8 is installed
command: rpm -q java-1.8.0-openjdk
args:
warn: False
register: java
ignore_errors: True
changed_when: java is failed
- name: Ensure that Java11 is installed
yum:
name: java-11-openjdk
state: present
become: True
when: java is failed
Before going forward with the other parts that are needed to execute this role, I'd like to spend a few words on the various parts of the role task list, since there...