debug – Print statements during execution

Synopsis

• This module prints statements during execution and can be useful for debugging variables or expressions without necessarily halting the playbook.
• Useful for debugging together with the ‘when:’ directive.
• This module is also supported for Windows targets.

Parameters

Parameter	Choices/Defaults	Comments
msg string	Default: "Hello world!"	The customized message that is printed. If omitted, prints a generic message.
var string		A variable name to debug. Mutually exclusive with the msg option. Be aware that this option already runs in Jinja2 context and has an implicit {{ }} wrapping, so you should not be using Jinja2 delimiters unless you are looking for double interpolation.
verbosity integer	Default: 0	A number that controls when the debug is run, if you set to 3 it will only run debug when -vvv or above

Notes

Note

• This module is also supported for Windows targets.

See Also

See also

assert – Asserts given expressions are true

The official documentation on the assert module.

fail – Fail with custom message

The official documentation on the fail module.

Examples

# Example that prints the loopback address and gateway for each host
- debug:
    msg: System {{ inventory_hostname }} has uuid {{ ansible_product_uuid }}

- debug:
    msg: System {{ inventory_hostname }} has gateway {{ ansible_default_ipv4.gateway }}
  when: ansible_default_ipv4.gateway is defined

# Example that prints return information from the previous task
- shell: /usr/bin/uptime
  register: result

- debug:
    var: result
    verbosity: 2

- name: Display all variables/facts known for a host
  debug:
    var: hostvars[inventory_hostname]
    verbosity: 4

# Example that prints two lines of messages, but only if there is an environment value set
- debug:
    msg:
    - "Provisioning based on YOUR_KEY which is: {{ lookup('env', 'YOUR_KEY') }}"
    - "These servers were built using the password of '{{ password_used }}'. Please retain this for later use."

Status

• This module is guaranteed to have backward compatible interface changes going forward. [stableinterface]
• This module is maintained by the Ansible Core Team. [core]

Red Hat Support

More information about Red Hat’s support of this module is available from this Red Hat Knowledge Base article.

Authors

• Dag Wieers (@dagwieers)
• Michael DeHaan

Hint

If you notice any issues in this documentation, you can edit this document to improve it.