Ansible: how to get output to display [duplicate]

Question

I have the following playbook, Playbook with output

There are currently no errors and it runs fine. However, it does not display the output to the console. I have come across this with other playbooks and got around it by adding the following task to the playbook:

-debug: var=output.stdout_lines 

and it prints the output. However, I tried to do the same thing in the above playbook and it says that the variable was undefined (code not shown because it didn't work).

Is anyone aware of a better way to get the output to print to the console without using -debug? Any ansible references would be greatly appreciated.

Answer 1

Every Ansible task when run can save its results into a variable. To do this, you have to specify which variable to save the results into. Do this with the register parameter, independently of the module used.

Once you save the results to a variable you can use it later in any of the subsequent tasks. So for example if you want to get the standard output of a specific task you can write the following:

--- - hosts: localhost   tasks:     - shell: ls       register: shell_result      - debug:         var: shell_result.stdout_lines 

Here register tells ansible to save the response of the module into the shell_result variable, and then we use the debug module to print the variable out.

An example run would look like the this:

PLAY [localhost] ***************************************************************  TASK [command] ***************************************************************** changed: [localhost]  TASK [debug] ******************************************************************* ok: [localhost] => {     "shell_result.stdout_lines": [         "play.yml"     ] } 

Responses can contain multiple fields. stdout_lines is one of the default fields you can expect from a module's response.

Not all fields are available from all modules, for example for a module which doesn't return anything to the standard out you wouldn't expect anything in the stdout or stdout_lines values, however the msg field might be filled in this case. Also there are some modules where you might find something in a non-standard variable, for these you can try to consult the module's documentation for these non-standard return values.

Alternatively you can increase the verbosity level of ansible-playbook. You can choose between different verbosity levels: -v, -vvv and -vvvv. For example when running the playbook with verbosity (-vvv) you get this:

PLAY [localhost] ***************************************************************  TASK [command] ***************************************************************** (...) changed: [localhost] => {     "changed": true,     "cmd": "ls",     "delta": "0:00:00.007621",     "end": "2017-02-17 23:04:41.912570",     "invocation": {         "module_args": {             "_raw_params": "ls",             "_uses_shell": true,             "chdir": null,             "creates": null,             "executable": null,             "removes": null,             "warn": true         },         "module_name": "command"     },     "rc": 0,     "start": "2017-02-17 23:04:41.904949",     "stderr": "",     "stdout": "play.retry\nplay.yml",     "stdout_lines": [         "play.retry",         "play.yml"     ],     "warnings": [] } 

As you can see this will print out the response of each of the modules, and all of the fields available. You can see that the stdout_lines is available, and its contents are what we expect.

To answer your main question about the jenkins_script module, if you check its documentation, you can see that it returns the output in the output field, so you might want to try the following:

tasks:   - jenkins_script:       script: (...)     register: jenkins_result    - debug:       var: jenkins_result.output