junos_command module not returning output - ansible

Question

I have an Ansible script where i am simply using junos_command module to get users list from Juniper switch, below is the snippet of my code. I keep getting the RuntimeWarning whenever i try to run this. Moreover I have been successfully able to run commands like 'show version' using the below code itself. Please help
Script:
name: / GET USERS / Get list of all the current users on switch
action: junos_command
args: { commands: 'show configuration system login',
provider: "{{ netconf }}" }
register: curr_users_on_switch
Error:
TASK [/ GET USERS / Get list of all the current users on switch] ***************
fatal: [rlab-er1]: FAILED! => {"changed": false, "failed": true, "module_stderr": "/home/mbhadoria/.local/lib/python2.7/site-packages/jnpr/junos/device.py:429: RuntimeWarning: CLI command is for debug use only!
\n warnings.warn(\"CLI command is for debug use only!\", RuntimeWarning)\nTraceback (most recent call last):
\n File \"/tmp/ansible_lVOmPp/ansible_module_junos_command.py\", line 261, in <module>
\n main()
\n File \"/tmp/ansible_lVOmPp/ansible_module_junos_command.py\", line 233, in main
\n xmlout.append(xml_to_string(response[index]))
\n File \"/tmp/ansible_lVOmPp/ansible_modlib.zip/ansible/module_utils/junos.py\", line 79, in xml_to_string\n File \"src/lxml/lxml.etree.pyx\", line 3350, in lxml.etree.tostring (src/lxml/lxml.etree.c:84534)\nTypeError: Type 'str' cannot be serialized.
\n", "module_stdout": "", "msg": "MODULE FAILURE", "parsed": false}

Answer 1

junos_command only support operation junos commands. What you are trying to run is configurational command. Hence you see "show version" which is operational command working but not "show configuration system login".
For such configuration data you can should use rpc option (get-configuration) with junos_command.
junos_command:
rpcs:
- "get_configuration
You can also use junos_get_config.
http://junos-ansible-modules.readthedocs.io/en/latest/junos_get_config.html
or junos_rpc
https://github.com/Juniper/ansible-junos-stdlib/blob/master/library/junos_rpc
ex:
- name: Junos OS version
hosts: all
connection: local
gather_facts: no
tasks:
- name: Get rpc run
junos_rpc:
host={{ inventory_hostname }}
user=xxxx
passwd=xxx
rpc=get-config
dest=get_config.conf
filter_xml="<configuration><system><login/></system></configuration>"
register: junos
or
tasks:
- name: Get rpc run
junos_get_config:
host: "{{ inventory_hostname }}"
user: xxxx
passwd: xxxx
logfile: get_config.log
dest: "{{ inventory_hostname }}.xml"
format: xml
filter: "system/login"
TASK [Get rpc run] *************************************************************
......
PLAY RECAP *********************************************************************
xxxk : ok=1 changed=1 unreachable=0 failed=0