shell/command modules not providing output from playbook on Raspberry Pis
Using Ansible 2.11.6 from Ubuntu. I have two Raspberry Pis in inventory. One is an older Pi3 with Stretch; the other a Pi4 with Buster.
$ ansible -i inventory -m shell -a "df -h" all
shows the result of df -h for both Pis, as expected. But
$ ansible-playbook -i inventory main.yml
where main.yml is
---
- hosts: all
tasks:
- name: show disk space
shell:
cmd: df -h
after gathering facts, shows
TASK [show disk space] *******************
changed: [pi4]
changed: [pi3]
without showing the output of df -h.
I've tried command: instead of shell:. I've tried executable: /bin/bash. No difference. The same main.yml works with a Vagrant ansible provisioner when building an Ubuntu VM, and shows df -h output.
What am I missing?
Update This was a mistake on my end. The Vagrantfile template I'd been using included ansible.verbose = true. Remove that, and everything behaves consistently.
At the default verbosity task results are not shown by the default stdout callback. Ad hoc commands normally use the minimal callback, which has different behaviour. If you are seeing it in the Vagrant output it is either using a different callback or running with a higher verbosity, where more information is displayed:
ec2-user@pandora ~ $ ansible-playbook test.yml
PLAY [localhost] ***************************************************************
TASK [command] *****************************************************************
changed: [localhost]
PLAY RECAP *********************************************************************
localhost : ok=1 changed=1 unreachable=0 failed=0 skipped=0 rescued=0 ignored=0
ec2-user@pandora ~ $ ANSIBLE_STDOUT_CALLBACK=minimal ansible-playbook test.yml
localhost | CHANGED | rc=0 >>
Filesystem Size Used Avail Use% Mounted on
devtmpfs 3.9G 0 3.9G 0% /dev
tmpfs 3.9G 272K 3.9G 1% /dev/shm
tmpfs 3.9G 8.9M 3.9G 1% /run
tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup
/dev/nvme0n1p1 12G 7.3G 4.8G 61% /
/dev/nvme1n1 40G 9.0G 32G 23% /home
fs-c2c955bb.efs.us-east-2.amazonaws.com:/ 8.0E 0 8.0E 0% /ammit
tmpfs 788M 0 788M 0% /run/user/1913323
tmpfs 788M 0 788M 0% /run/user/257994
tmpfs 788M 0 788M 0% /run/user/1000
ec2-user@pandora ~ $ ansible-playbook test.yml -vvv
ansible-playbook [core 2.11.5]
config file = /home/ec2-user/ansible-aws/ansible/ansible.cfg
configured module search path = ['/home/ec2-user/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
ansible python module location = /home/ec2-user/ansible-aws/.venv/lib/python3.8/site-packages/ansible
ansible collection location = /home/ec2-user/ansible-aws/ansible/collections
executable location = /home/ec2-user/ansible-aws/.venv/bin/ansible-playbook
python version = 3.8.5 (default, Feb 18 2021, 01:24:20) [GCC 7.3.1 20180712 (Red Hat 7.3.1-12)]
jinja version = 3.0.2
libyaml = True
Using /home/ec2-user/ansible-aws/ansible/ansible.cfg as config file
Skipping callback 'default', as we already have a stdout callback.
Skipping callback 'minimal', as we already have a stdout callback.
Skipping callback 'oneline', as we already have a stdout callback.
PLAYBOOK: test.yml *************************************************************
1 plays in test.yml
PLAY [localhost] ***************************************************************
META: ran handlers
TASK [command] *****************************************************************
task path: /home/ec2-user/test.yml:4
Using module file /home/ec2-user/ansible-aws/.venv/lib/python3.8/site-packages/ansible/modules/command.py
Pipelining is enabled.
<127.0.0.1> ESTABLISH LOCAL CONNECTION FOR USER: ec2-user
<127.0.0.1> EXEC /bin/sh -c 'sudo -H -S -n -u root /bin/sh -c '"'"'echo BECOME-SUCCESS-gljjnrdznzzibrxampvyyzigtjnozzra ; /home/ec2-user/ansible-aws/.venv/bin/python'"'"' && sleep 0'
changed: [localhost] => {
"changed": true,
"cmd": [
"df",
"-h"
],
"delta": "0:00:00.004672",
"end": "2021-10-20 12:22:07.355248",
"invocation": {
"module_args": {
"_raw_params": "df -h",
"_uses_shell": false,
"argv": null,
"chdir": null,
"creates": null,
"executable": null,
"removes": null,
"stdin": null,
"stdin_add_newline": true,
"strip_empty_ends": true,
"warn": false
}
},
"msg": "",
"rc": 0,
"start": "2021-10-20 12:22:07.350576",
"stderr": "",
"stderr_lines": [],
"stdout": "Filesystem Size Used Avail Use% Mounted on\ndevtmpfs 3.9G 0 3.9G 0% /dev\ntmpfs 3.9G 124K 3.9G 1% /dev/shm\$
tmpfs 3.9G 8.8M 3.9G 1% /run\ntmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup\n/dev/nvme0n1p1 12G 7.3G 4.8G 61% /\n/dev/nvme1n1
40G 9.0G 32G 23% /home\nfs-c2c955bb.efs.us-east-2.amazonaws.com:/ 8.0E 0 8.0E 0% /ammit\ntmpfs 788M 0 788M 0% /run/user/1913323\ntmpfs
788M 0 788M 0% /run/user/257994",
"stdout_lines": [
"Filesystem Size Used Avail Use% Mounted on",
"devtmpfs 3.9G 0 3.9G 0% /dev",
"tmpfs 3.9G 124K 3.9G 1% /dev/shm",
"tmpfs 3.9G 8.8M 3.9G 1% /run",
"tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup",
"/dev/nvme0n1p1 12G 7.3G 4.8G 61% /",
"/dev/nvme1n1 40G 9.0G 32G 23% /home",
"fs-c2c955bb.efs.us-east-2.amazonaws.com:/ 8.0E 0 8.0E 0% /ammit",
"tmpfs 788M 0 788M 0% /run/user/1913323",
"tmpfs 788M 0 788M 0% /run/user/257994"
]
}
META: ran handlers
META: ran handlers
PLAY RECAP *********************************************************************
localhost : ok=1 changed=1 unreachable=0 failed=0 skipped=0 rescued=0 ignored=0
You can also explicitly output things using debug:
---
- hosts: all
tasks:
- name: get disk space
command:
cmd: df -h
register: result
- debug:
msg: "{{ result.stdout_lines }}"
ec2-user@pandora ~ $ ansible-playbook test.yml
PLAY [localhost] ***************************************************************
TASK [get disk space] **********************************************************
changed: [localhost]
TASK [debug] *******************************************************************
ok: [localhost] => {
"msg": [
"Filesystem Size Used Avail Use% Mounted on",
"devtmpfs 3.9G 0 3.9G 0% /dev",
"tmpfs 3.9G 124K 3.9G 1% /dev/shm",
"tmpfs 3.9G 8.8M 3.9G 1% /run",
"tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup",
"/dev/nvme0n1p1 12G 7.3G 4.8G 61% /",
"/dev/nvme1n1 40G 9.0G 32G 23% /home",
"fs-c2c955bb.efs.us-east-2.amazonaws.com:/ 8.0E 0 8.0E 0% /ammit",
"tmpfs 788M 0 788M 0% /run/user/1913323",
"tmpfs 788M 0 788M 0% /run/user/257994"
]
}
PLAY RECAP *********************************************************************
localhost : ok=2 changed=1 unreachable=0 failed=0 skipped=0 rescued=0 ignored=0
You are missing the debug task that would show the output.
---
- hosts: all
tasks:
- name: show disk space
shell:
cmd: df -h
register: df
- debug:
var: df
Ansible does not show the output of the command directly.