Limit ansible output from shell command results list - ansible

Question

Team,
how can I avoid this huge output and just get the value I want from every item in the results list?
I just want the item value that is hostname to be shown and only the line from stdout for every host.
- name: "Mount count on GPU Nodes"
shell: "mount | grep -Ec '/dev/sd.*\\<csi' | awk '{ print $0,\"mounts found on $HOSTNAME\"($0>64? \" that are more than 64.\" : \".\") }'"
register: mounts_count
changed_when: false
failed_when:
delegate_to: "{{ item }}"
with_items: "{{ groups['kube-gpu-node'] }}"
- name: Check if csi related mounts are present on gpu nodes
assert:
that:
- item.stdout is search('64')
fail_msg: " mounts are present on this node"
success_msg: "mounts are not present on this node"
loop: "{{ mounts_count.results }}"
loop_control:
label: "{{ item.item }}"
ignore_errors: yes
sample output
TASK [team-services-pre-install-checks : Check if csi related mounts are present on gpu nodes] ***
Wednesday 18 December 2019 22:47:17 +0000 (0:00:07.012) 0:00:09.110 ****
failed: [localhost] (item=node1) => {
"ansible_loop_var": "item",
"assertion": "item.stdout is search('0')",
"changed": false,
"evaluated_to": false,
"item": {
"ansible_loop_var": "item",
"changed": false,
"cmd": "mount | grep -Ec '/dev/sd.*\\<csi' | awk '{ print $0,\"mounts found on hostname\"($0>64? \" that are more than 64.\" : \".\") }'",
"delta": "0:00:00.102618",
"end": "2019-12-18 22:47:12.566399",
"failed": false,
"invocation": {
"module_args": {
"_raw_params": "mount | grep -Ec '/dev/sd.*\\<csi' | awk '{ print $0,\"mounts found on hostname\"($0>64? \" that are more than 64.\" : \".\") }'",
"_uses_shell": true,
"argv": null,
"chdir": null,
"creates": null,
"executable": null,
"removes": null,
"stdin": null,
"stdin_add_newline": true,
"strip_empty_ends": true,
"warn": true
}
},
"item": "node1",
"rc": 0,
"start": "2019-12-18 22:47:12.463781",
"stderr": "",
"stderr_lines": [],
"stdout": "1 mounts found on hostname.",
"stdout_lines": [
"1 mounts found on hostname."
]
},
"msg": " mounts are present on this node"
}
ok: [localhost] => (item=node2) => {
"ansible_loop_var": "item",
"changed": false,
"item": {
"ansible_loop_var": "item",
"changed": false,
"cmd": "mount | grep -Ec '/dev/sd.*\\<csi' | awk '{ print $0,\"mounts found on hostname\"($0>64? \" that are more than 64.\" : \".\") }'",
"delta": "0:00:00.109244",
"end": "2019-12-18 22:47:14.303305",
"failed": false,
"invocation": {
"module_args": {
"_raw_params": "mount | grep -Ec '/dev/sd.*\\<csi' | awk '{ print $0,\"mounts found on hostname\"($0>64? \" that are more than 64.\" : \".\") }'",
"_uses_shell": true,
"argv": null,
"chdir": null,
"creates": null,
"executable": null,
"removes": null,
"stdin": null,
"stdin_add_newline": true,
"strip_empty_ends": true,
"warn": true
}
},
"item": "node2",
"rc": 0,
"start": "2019-12-18 22:47:14.194061",
"stderr": "",
"stderr_lines": [],
"stdout": "0 mounts found on hostname.",
"stdout_lines": [
"0 mounts found on hostname."
]
},
"msg": "mounts are not present on this node"
}
expected output: below is just a manual sample i made but any thing that shows hostname and stdout_line is good enough.
"item": "node1"
0 mounts found on hostname.
"item": "node2"
0 mounts found on hostname.

Answer 1

Ansible isn't really designed to produce "nice" output on the console. If you want information produced in a specific format, you are better off generating a file from a template.
That said, the assert module is designed primarily as a debugging tool and generates verbose output. I think you could get the behavior you want using the fail module instead:
- name: Check if csi related mounts are present on gpu nodes
fail:
msg: " mounts are present on this node"
when: item.stdout is not search('64')
loop: "{{ mounts_count.results }}"
loop_control:
label: "{{ item.item }}"
ignore_errors: yes
This will simply "skip" items for which the when condition is false.