Defaulting undefined variables

We have seen in the previous sections that it is always wise to check whether a variable is defined before using it. We can set a default value for the variable so that, instead of failing, Ansible will use that value if the variable is not defined. To do so, we use this:

{{ backup_disk | default("/dev/sdf") }}

This filter will not assign the default value to the variable; it will only pass the default value to the current task where it is being used. Let's look at a few more examples of Jinja filters themselves before closing this section:

• Execute this to get a random character from a list:

{{ ['a', 'b', 'c', 'd'] | random }} 

• Execute this to get a random number from 0 to 100:

{{ 100 | random }}

• Execute this to get a random number from 10 to 50:

{{ 50  | random(10) }}

• Execute this to...